CAPRYLIC ACID / OCTANOIC ACID

WHAT IS CAPRYLIC ACID / OCTANOIC ACID?

Caprylic Acid / Octanoic Acid, known as Kaprilik Asit or Oktanoik Asit in Turkish, is a linear saturated monocarboxylic fatty acid containing eight carbon atoms (C8H16O2, structural formula CH3(CH2)6COOH). In chemical nomenclature, Octanoic Acid is the systematic IUPAC and pharmacopoeial designation, whereas Caprylic Acid is the established trivial and oleochemical trade name.
Classified as a medium-chain fatty acid (MCFA) with lipid shorthand C8:0, it occurs naturally as a triglyceride component in coconut oil (5% to 9%), palm kernel oil (3% to 5%), and mammalian milk fats. Commercial volumes are obtained primarily by high-pressure steam splitting and vacuum fractional distillation of coconut or palm kernel oils, or synthetically via oxidation of 1-octanol or hydroformylation of 1-heptene.
Commercial grades sold under the dual designation Caprylic Acid / Octanoic Acid vary in gas-chromatographic C8 chain purity—typically 95% minimum, 98% minimum, or 99% minimum—and must not be confused with unseparated Caprylic/Capric Acid blends (C8-C10, CAS 68937-75-7), branched 2-ethylhexanoic acid (CAS 149-57-5), neutral Caprylic/Capric Triglyceride (MCT oil, CAS 73398-61-5), or Sodium Caprylate salt (CAS 1984-06-1).
Common Product and Chemical Names:
Caprylic Acid
Octanoic Acid
Caprylic Acid / Octanoic Acid
n-Octanoic Acid
n-Caprylic Acid
Octylic Acid
Octoic Acid
1-Heptanecarboxylic Acid
C8 Fatty Acid
C8:0 Fatty Acid
Fractionated Caprylic Acid
Kaprilik Asit
Oktanoik Asit
Acidum Octanoicum
Caprylic Acid 98%
Caprylic Acid 99%
Food Grade Caprylic Acid / E570
Cosmetic Grade Caprylic Acid
Pharmaceutical Grade Octanoic Acid (Ph. Eur. / NF)
Each name reflects a specific regulatory or industrial context. While Octanoic Acid is required on European Pharmacopoeia (Ph. Eur.), USP-NF, and REACH documents, Caprylic Acid (INCI: CAPRYLIC ACID) is standard in cosmetics and oleochemical commerce. Buyers should always confirm CAS No. 124-07-2 to avoid receiving branched C8 'octoic acid' (2-ethylhexanoic acid) or mixed C8-C10 fatty acids.

CAS NO, EC / EINECS NO AND INCI NAME

Product name: Caprylic Acid / Octanoic Acid
Systematic IUPAC Name: Octanoic acid
Common oleochemical name: Caprylic acid (n-Octanoic acid)
Turkish names: Kaprilik Asit / Oktanoik Asit
CAS No: 124-07-2
EC / EINECS No: 204-677-5
CLP Index No: 607-708-00-4
INCI Name: CAPRYLIC ACID
FEMA No: 2799
Food Additive Code: E570 (EU Fatty acids) / 21 CFR 184.1025 (US GRAS)
Molecular Formula: C8H16O2
Structural Formula: CH3(CH2)6COOH
Molecular Weight: 144.21 g/mol
Chemical Class: Saturated linear medium-chain monocarboxylic acid (C8:0)
Physical Form: Clear, colorless to pale yellow oily liquid above ~16.5 °C; white crystalline solid below ~16.0 °C
Ionic Character: Weak monoprotic organic acid (pKa 4.89 at 25 °C)
Main Functions: Chemical intermediate for esters and salts, antimicrobial food-contact sanitizer active, metalworking corrosion inhibitor precursor, bioprocess IgG precipitant, pH adjuster, and flavoring adjuvant
CAS No. 124-07-2 and EC No. 204-677-5 identify linear single-cut Caprylic Acid / Octanoic Acid across technical (95%), high-purity (98%–99%), food, cosmetic, and compendial grades.
When Caprylic Acid is supplied as an unseparated mixture with C10 capric acid (Caprylic/Capric Acid), it is registered under CAS No. 68937-75-7 (Fatty acids, C8-10). Branched 2-ethylhexanoic acid is registered under CAS No. 149-57-5, Sodium Caprylate under CAS No. 1984-06-1, and Caprylic/Capric Triglyceride under CAS No. 73398-61-5. Verifying CAS No. 124-07-2 on the TDS and COA prevents substitution errors.

CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF CAPRYLIC ACID / OCTANOIC ACID

Caprylic Acid / Octanoic Acid combines a hydrophobic seven-carbon n-heptyl tail (CH3(CH2)6-) with a polar, hydrogen-bonding terminal carboxyl group (-COOH). This eight-carbon chain length places the molecule directly at the transition between water-miscible short-chain acids (C2–C4) and water-insoluble long-chain solid fatty acids (C12–C18).
At 20 degrees Celsius, protonated Octanoic Acid dissolves in water at approximately 0.68 g/L (680 ppm) and exhibits an octanol-water partition coefficient (log Kow) of 3.05. In neat liquid form and non-polar oils, two molecules pair via hydrogen bonds into cyclic dimers, elevating the normal boiling point to 237–239 degrees Celsius.
In aqueous media, molecular charge is governed by solution pH relative to its pKa of 4.89. Below pH 3.8, over 90 percent of the acid remains uncharged (R-COOH), enabling rapid partitioning into microbial lipid membranes and hydrophobic protein pockets.
Above pH 6.5–8.5, neutralization with alkali hydroxides or alkanolamines converts the acid into the water-soluble octanoate anion (R-COO-). Because the C8 tail is relatively short, aqueous octanoate salts exhibit a high critical micelle concentration (~0.35–0.40 mol/L), providing fast wetting and hydrotropic solubilization with minimal foaming.
Because the C8:0 carbon chain contains zero double bonds, Caprylic Acid / Octanoic Acid is immune to allylic free-radical autoxidation. Esters and salts derived from it resist thermal darkening, polymer skinning, and rancid odor development.

PRODUCTION AND CHEMICAL ORIGIN OF CAPRYLIC ACID / OCTANOIC ACID

Commercial Caprylic Acid / Octanoic Acid is manufactured primarily through the oleochemical fractionation of coconut oil or palm kernel oil, and secondarily through synthetic petrochemical routes.
In the direct oleochemical splitting route, lauric vegetable oils are hydrolyzed with countercurrent steam at 240 to 260 degrees Celsius and 45 to 60 bar to yield crude mixed fatty acids (C6–C18) and aqueous glycerol. Vacuum fractional distillation columns first strip off low-boiling C6 hexanoic acid and then isolate the C8 Caprylic Acid / Octanoic Acid fraction overhead from higher-boiling C10 capric and C12 lauric acids.
In the methyl ester route, coconut or palm kernel oil is transesterified with methanol to form fatty acid methyl esters (FAME), fractionally distilled to isolate high-purity methyl octanoate (CAS 111-11-5), and hydrolyzed back to high-purity Caprylic Acid / Octanoic Acid.
In the synthetic route, linear octanoic acid is produced by catalytic oxidation of 1-octanol (from ethylene oligomerization) or hydroformylation of 1-heptene followed by octanal oxidation. Natural oleochemical grades contain only even-carbon trace homologues (C6 and C10) and 100 percent biobased carbon, whereas synthetic grades may contain trace odd-carbon (C7/C9) or branched C8 isomers.
Ataman Kimya acts as a chemical supplier and distributor providing commercial grades of Caprylic Acid / Octanoic Acid rather than operating primary triglyceride splitting plants. Buyers requiring specific vegetable origin, non-palm coconut origin, or RSPO certifications should state these requirements during inquiry.

PHYSICAL AND CHEMICAL PROPERTIES OF CAPRYLIC ACID / OCTANOIC ACID

Physical properties of Caprylic Acid / Octanoic Acid include fixed molecular constants for C8H16O2 and grade-dependent specification ranges governed by fractional distillation purity.
General technical properties:
Physical appearance (at 20–25 °C): Clear, colorless to pale yellowish oily liquid
Physical appearance (below 16 °C): White to off-white crystalline solid or slush
Odor: Mild, characteristic fatty, slightly sour odor (sharper if C6 impurity exceeds 0.5%)
Molecular formula: C8H16O2
Molecular weight: 144.21 g/mol
CAS No: 124-07-2
EC / EINECS No: 204-677-5
INCI Name: CAPRYLIC ACID
Melting point / Solidification point (Titer): 16.0 to 16.7 °C (literature: 16.3–16.5 °C)
Boiling point (at 1013 hPa): 237 to 239 °C (approx. 124 °C at 13.3 hPa)
Density / Specific Gravity (at 20 °C): 0.908 to 0.912 g/cm3 (typical: 0.910 g/cm3)
Dynamic viscosity (at 20 °C): Approx. 5.7 to 6.0 mPa·s (cP)
Kinematic viscosity (at 20 °C): Approx. 6.3 to 6.6 mm2/s (cSt)
Refractive index (nD20): 1.4270 to 1.4288 (typical: 1.4278)
Vapor pressure (at 25 °C): Approx. 0.0049 hPa
Flash point (Closed Cup): Approx. 110 to 130 °C
Autoignition temperature: >300 °C
Water solubility (at 20 °C): Approx. 0.68 g/L (1.1 g/L at 60 °C)
Organic solubility: Miscible with ethanol, isopropanol, propylene glycol, diethyl ether, acetone, chloroform, and hydrocarbon/ester oils
Dissociation constant (pKa at 25 °C): 4.89
Partition coefficient (log Kow): 3.05
Theoretical Acid Value (100% C8H16O2): 389.0 mg KOH/g
Commercial Acid Value (98%–99% C8 grade): Typically 383 to 391 mg KOH/g
Commercial Saponification Value (98%–99% C8 grade): Typically 384 to 392 mg KOH/g
Iodine Value (Wijs): Theoretical 0.0 g I2/100 g; commercial limit typically <= 0.5 to <= 1.0 g I2/100 g
Color (APHA / Hazen): Typically <= 30 to <= 60 APHA (or Lovibond 5.25" <= 3.0Y/0.3R to 5.0Y/0.5R)
Moisture (Karl Fischer): Typically <= 0.10% to <= 0.20% w/w
Typical GC Chain Distribution (98%–99% grade): C6 <= 0.5%–1.0%; C8 >= 98.0% or >= 99.0%; C10 <= 0.5%–1.5%; C12 <= 0.1%–0.2%
These values represent standard technical and compendial benchmarks rather than binding specifications for every lot. Exact limits must be verified on the supplier's TDS and batch COA.

WHY EACH IMPORTANT PROPERTY MATTERS IN PRACTICE

Each analytical parameter on a Caprylic Acid / Octanoic Acid specification directly impacts reactor stoichiometry, formulation stability, or sensory quality:
- Acid Value (AV): Dictates the exact stoichiometric weight required when esterifying polyols or neutralizing with NaOH, KOH, or alkanolamines. Pure C8 has a theoretical AV of 389.0 mg KOH/g, immediately distinguishing it from C8-C10 blends (AV ~355–368 mg KOH/g) and pure C10 capric acid (AV ~325.7 mg KOH/g).
- Saponification Value (SV) and Ester Value (SV - AV): Confirms complete triglyceride splitting. An Ester Value above 1.5–2.0 mg KOH/g indicates unsplit neutral esters that can cause turbidity or oil separation in aqueous cleaners and coolants.
- Capillary GC Chain Purity (C6, C8, C10): Because equal amounts of C6 (AV 483.0) and C10 (AV 325.7) can average out to the same bulk Acid Value as pure C8, only GC proves true chain purity. Excess C6 (>0.5%) causes pungent goat-like odor and lowers flash point; excess C10 (>1.5%) reduces water solubility, precipitates calcium soaps in hard water, and alters protein precipitation in plasma fractionation.
- Iodine Value (IV) and APHA Color: Measure freedom from unsaturated contaminants and thermal/iron discoloration. Low IV (<= 0.5 g I2/100 g) and water-white color (<= 30 APHA) are critical for non-yellowing polyol ester lubricants and clear cosmetic emollients.
- Solidification Point (Titer, ~16.0–16.7 °C): Signals that unheated drums or IBCs will freeze in warehouses below 16 °C, requiring gentle warm-room conditioning and homogenization prior to pumping.
- Moisture Content (Karl Fischer): Must be kept low (<= 0.10%–0.15%) in acyl chloride synthesis, organometallic catalyst preparation, and moisture-sensitive esterifications.

HOW DOES CAPRYLIC ACID / OCTANOIC ACID WORK AT THE MOLECULAR LEVEL?

The eight-carbon amphiphilic structure of Caprylic Acid / Octanoic Acid enables distinct molecular mechanisms depending on system pH and reaction partner:
- Microbial Membrane Disruption and Cytoplasmic Acidification: At pH < 3.5–4.0 (below pKa 4.89), uncharged lipophilic octanoic acid monomers partition into bacterial, fungal, and enveloped-viral lipid bilayers, disrupting acyl-chain packing and causing membrane leakage. Once inside the neutral cytoplasm (pH ~7.2), the acid dissociates into an octanoate anion and a free proton, collapsing intracellular pH and energy metabolism.
- Selective Non-IgG Protein Precipitation in Bioprocessing: At pH 4.5 to 5.5 in blood plasma or cell culture harvests, Caprylic Acid / Octanoic Acid binds selectively to hydrophobic patches on albumin, lipoproteins, and alpha/beta globulins, inducing their precipitation and inactivating lipid-enveloped viruses while leaving beta-sheet-rich Immunoglobulin G (IgG) in solution.
- Anodic Metal Oxide Chemisorption for Corrosion Inhibition: When neutralized with alkanolamines (MEA, TEA, DGA, AMP) at pH 8.5–9.8 in metalworking coolants, the octanoate carboxylate group (-COO-) coordinates with iron and aluminum cations on fresh metal surfaces while the C8 tail forms a hydrophobic barrier film against oxygen and corrosive ions.
- Equilibrium Perhydrolysis to Peroxyoctanoic Acid (POOA): In acidic hydrogen peroxide / acetic acid mixtures, Octanoic Acid reacts reversibly with H2O2 to form lipophilic peroxyoctanoic acid (CAS 33734-57-5), penetrating biofilms and spores.
- Nucleophilic Acyl Esterification and Amidation: Reacts with hindered polyols (TMP, PE, NPG), glycerol, monoalcohols, and amines to build low-viscosity synthetic lubricant base stocks, C8 MCT oils, aroma esters, and cosmetic emollients.
- Metallic Soap Coordination: Reacts with metal oxides or hydroxides (Ca, Zn, Ba, Co, Zr, Bi) to form hydrocarbon-soluble metallic octanoates used as PVC heat stabilizers, alkyd driers, and polyurethane catalysts.

WHAT PROBLEMS CAN CAPRYLIC ACID / OCTANOIC ACID HELP SOLVE?

Caprylic Acid / Octanoic Acid addresses specific formulation and processing problems where unsaturated, longer-chain (C10–C18), or shorter-chain (C4–C6) acids show limitations.

Oxidative darkening and rancidity in liquid formulations
Unsaturated liquid fatty acids such as oleic acid (C18:1) oxidize rapidly at double bonds when heated or exposed to air, creating rancid odors, dark colors, and sticky deposits. Because Caprylic Acid / Octanoic Acid is a fully saturated (C8:0) liquid above 16.5 °C, its esters and salts resist autoxidation and thermal yellowing.

High viscosity and solid-handling bottlenecks of C10–C18 saturated acids
Capric (C10), lauric (C12), palmitic (C16), and stearic (C18) acids are solids at room temperature requiring steam-heated melt tanks, and their esters have higher viscosities and pour points. Caprylic Acid / Octanoic Acid is a low-viscosity liquid (~5.8 mPa·s at 20 °C) in conditioned plants and yields esters with pour points below -40 °C.

Excessive foaming and chemical residues in CIP sanitization
Quaternary ammonium sanitizers foam heavily in clean-in-place (CIP) spray systems and leave persistent residues, while chlorine corrodes stainless steel welds. Acidified Caprylic Acid / Octanoic Acid sanitizers provide rapid bactericidal and yeasticidal action with zero foam and qualify for no-rinse food-contact sanitization when properly formulated.

Flash rusting and hard-water soap scum in metalworking fluids
Long-chain oleate and tallate corrosion inhibitors precipitate as sticky calcium soaps in hard water (>200 ppm CaCO3), blinding coolant filters. Amine octanoate salts resist hard-water calcium precipitation and prevent flash rust on cast iron and steel without sump foaming.

Fouling and viral risk in downstream antibody purification
Adding compendial Octanoic Acid at pH 4.5–5.5 precipitates host-cell proteins and non-IgG plasma proteins while inactivating lipid-enveloped viruses in a single ambient-temperature step prior to chromatography.

Heavy, greasy skin feel in personal care oils
Esters synthesized from Caprylic Acid / Octanoic Acid (such as caprylic/capric triglyceride and cetyl octanoate) replace heavy mineral oils and volatile silicones with light, dry-touch emollience.

Severe malodor of shorter volatile fatty acids (C4–C6)
High-purity Caprylic Acid / Octanoic Acid (with C6 kept below 0.2%–0.5%) provides high molar acid functionality without the penetrating, offensive stench and high volatility of butyric, valeric, or caproic acid.

BENEFITS FOR THE MANUFACTURER AND END USER

Technical benefits for manufacturers, formulators, and process engineers include:
- Pumpable liquid handling above 17 °C with low Newtonian viscosity (~5.8 mPa·s), eliminating high-temperature melting kettles
- High molar carboxyl density (389.0 mg KOH/g theoretical AV; 6,934 moles of -COOH per metric ton, nearly double that of oleic or stearic acid)
- Tight stoichiometric reproducibility when using 98% or 99% fractionated C8 cuts
- Thermal and oxidative color stability during high-temperature esterification (>200 °C)
- Rapid, clean aqueous/organic phase separation without rag-layer emulsions
- Non-foaming behavior in high-shear mixers, CNC coolant nozzles, and CIP spray loops
Practical benefits for the final product and end user include:
- Long shelf-life stability without rancid off-odors or yellowing in cosmetics, lubricants, and nutritional MCT oils
- Residue-free, low-foam microbiological sanitization on dairy, brewery, and food-packaging equipment
- Reliable sub-zero fluidity and low cold-cranking torque in aviation turbine and refrigeration compressor lubricants
- Clean, rust-free machined ferrous metal parts without sticky hard-water soap deposits
- High-purity, virally inactivated therapeutic Immunoglobulin G (IVIG / SCIG) and thermally stabilized Human Serum Albumin preparations

APPLICATIONS OF CAPRYLIC ACID / OCTANOIC ACID

Caprylic Acid / Octanoic Acid is selected across chemical synthesis and industrial formulation whenever a low-viscosity, fully saturated eight-carbon carboxylic acid is required.

Synthetic polyol ester and diester lubricants
In synthetic lubricant production, Caprylic Acid / Octanoic Acid is esterified with neopentyl glycol (NPG), trimethylolpropane (TMP), or pentaerythritol (PE) to manufacture polyol esters (POEs) for jet turbine engines (MIL-PRF-23699), HFC/HFO refrigeration compressors, and biodegradable hydraulic fluids. The linear C8 chain imparts low viscosity, pour points below -40 °C, high lubricity, and oxidative stability. Buyers monitor Acid Value, Iodine Value (<= 0.5 g I2/100 g), APHA color, and moisture.

Water-miscible metalworking fluids and corrosion inhibitors
In semi-synthetic and synthetic cutting, grinding, and rolling fluids, Caprylic Acid / Octanoic Acid is neutralized with alkanolamines (MEA, TEA, DGA, AMP) to form low-foam amine octanoate corrosion inhibitors. It prevents flash rust on cast iron and steel while tolerating hard water up to 500 ppm CaCO3 without precipitating sticky soap scum.

Low-foam clean-in-place food-contact surface sanitizers
In dairy, brewery, winery, beverage, and meat-processing plants, Caprylic Acid / Octanoic Acid serves as the antimicrobial active in acidic CIP sanitizers (pH < 3.5) and peroxyoctanoic acid equilibrium disinfectants. It delivers broad-spectrum bactericidal and yeasticidal knockdown without foaming in spray balls or leaving quaternary ammonium residues.

Biopharmaceutical plasma fractionation and IgG purification
In blood plasma fractionation and monoclonal antibody purification, compendial Octanoic Acid (Ph. Eur. / NF) is added at pH 4.5 to 5.5 to precipitate non-IgG proteins (albumin, lipoproteins, alpha/beta globulins) and inactivate lipid-enveloped viruses while leaving purified IgG in the supernatant.

Cosmetic emollients, cleansers and personal care formulations
In cosmetics (INCI: CAPRYLIC ACID), it is used directly as a pH adjuster, liquid soap co-base, and deodorant/microbiome active, and upstream as the C8 feedstock for Caprylic/Capric Triglyceride, Glyceryl Caprylate, Coco-Caprylate, and Capryloyl Glycine.

Food flavoring, processing aids and nutritional C8 MCT oil
In food production (FCC / E570 / 21 CFR 184.1025 / FEMA 2799), Food Grade Caprylic Acid / Octanoic Acid provides cheese, butter, and dairy flavor notes, acts as a defoamer and anti-stick processing aid, and serves as the feedstock for pure C8 tricaprylin (ketogenic MCT oil) and fruity octanoate flavor esters.

Agricultural contact herbicides and crop protection
In agriculture, Caprylic Acid / Octanoic Acid (alone or blended with capric or pelargonic acid) acts as a fast-acting, non-systemic burndown herbicide and haulm desiccant that disrupts plant cuticle waxes and epidermal membranes without persistent soil residues.

Alkyd resins, coatings, PVC heat stabilizers and mineral flotation
In polymers and coatings, it functions as a non-yellowing chain terminator for baking alkyds, a precursor to Ca/Zn and Ba/Zn octanoate PVC heat stabilizers and cobalt/zirconium coating driers, and a selective collector in phosphate, fluorite, and rare-earth mineral flotation.

WHICH INDUSTRIES USE CAPRYLIC ACID / OCTANOIC ACID?

Caprylic Acid / Octanoic Acid is used across regulated and heavy industrial sectors according to its chain purity and regulatory grade.
Main industries include:
- Synthetic lubricant and refrigeration fluid manufacturing
- Metalworking fluids, machining coolants, and industrial cleaners
- Institutional, dairy, brewery, and food-contact CIP sanitization
- Biopharmaceutical plasma fractionation and therapeutic antibody manufacturing
- Cosmetics, personal care, and oleochemical emollient ester synthesis
- Food, beverage, flavor ester, and clinical nutrition (MCT oil) production
- Pharmaceuticals and drug-delivery excipient manufacturing
- Agriculture, crop protection, and non-selective herbicide formulation
- Paints, coatings, printing inks, and non-yellowing alkyd resins
- PVC heat stabilization, rubber compounding, and polymer processing
- Mining, oxide/carbonate mineral froth flotation, and hydrometallurgy
- Aroma chemicals, perfumery, and organic intermediate synthesis (octanoyl chloride, octanenitrile, octylamine)
Each sector prioritizes different specification parameters: bioprocess users focus on Ph. Eur./NF chromatographic purity and endotoxins; lubricant synthesis engineers focus on Acid Value, Iodine Value, and moisture; and cosmetic formulators focus on low C6 odor and water-white APHA color.

USE OF CAPRYLIC ACID / OCTANOIC ACID IN COSMETICS AND PERSONAL CARE

In cosmetic and personal care formulations, Caprylic Acid / Octanoic Acid (INCI: CAPRYLIC ACID) is used as a pH regulator, soap-forming fatty acid, polarity modifier, and antimicrobial co-active, as well as the acyl building block for lightweight esters.
Key functions in cosmetic products include:
- Adjusting emulsion pH and supporting skin-barrier acid mantle compatibility
- Forming fast-rinsing, low-residue potassium or alkanolamine octanoate soaps in liquid cleansers
- Solubilizing crystalline UV filters, lipophilic actives, and pigments in oil phases
- Assisting odor control against Gram-positive bacteria in deodorant and foot-care products
- Producing dry-touch emollients (Caprylic/Capric Triglyceride, Cetyl Octanoate, Propylene Glycol Dicaprylate/Dicaprate) and multifunctional boosters (Glyceryl Caprylate, Caprylhydroxamic Acid, Capryloyl Glycine, Capryloyl Salicylic Acid)
For cosmetic applications, buyers should select a vegetable-derived grade with >= 98% or >= 99% C8 purity, minimal C6 hexanoic acid content (<= 0.2%–0.5%) to avoid fatty goat-like odor, low APHA color (<= 30), and verified heavy-metal and regulatory documentation.

USE OF CAPRYLIC ACID / OCTANOIC ACID IN FOOD AND BEVERAGE APPLICATIONS

When supplied as a verified Food Grade (FCC / E570 / 21 CFR 184.1025) product, Caprylic Acid / Octanoic Acid is used as a flavoring adjuvant (FEMA No. 2799), processing aid, food-contact antimicrobial component, and feedstock for nutritional lipids.
Main functions in food applications include:
- Imparting authentic tangy cheese, butter, and dairy flavor profiles at trace levels in savory snacks, cheese powders, baked goods, and dairy analogs
- Producing fruity and wine-like flavor esters such as ethyl octanoate, isoamyl octanoate, and allyl octanoate
- Manufacturing pure C8 medium-chain triglycerides (tricaprylin / C8 MCT oil) for ketogenic nutrition, medical foods, and infant lipid blends
- Acting as a defoaming and anti-stick processing aid under E570 regulations
- Formulating no-rinse food-contact surface sanitizers (per 21 CFR 178.1010 and 40 CFR 180.940) for food and beverage processing plants
When purchasing for food use, Food Grade / FCC / E570 status, COA, SDS, heavy metal limits (Pb, As, Hg), residue on ignition, unsaponifiable matter, and Kosher, Halal, Non-GMO, and allergen declarations must be verified. Technical grades must never be used in food production.

PHARMACEUTICAL AND BIOTECHNOLOGY APPLICATIONS OF CAPRYLIC ACID / OCTANOIC ACID

In pharmaceutical and biopharmaceutical manufacturing, compendial Caprylic Acid / Octanoic Acid (Ph. Eur. Acidum octanoicum / USP-NF Octanoic Acid) serves as a selective protein-fractionation reagent, viral-inactivation agent, excipient, and salt precursor.
In downstream blood plasma fractionation and monoclonal antibody processing, Octanoic Acid is added at pH 4.5 to 5.5 (typically 0.4% to 2.0% w/v) to precipitate non-IgG proteins (albumin, lipoproteins, transferrin, plasmin) and disrupt lipid-enveloped viruses (HIV, HBV, HCV), leaving purified Immunoglobulin G (IgG) in solution for IVIG, SCIG, and hyperimmune sera.
Neutralization with pharmaceutical-grade sodium hydroxide produces Sodium Caprylate (CAS 1984-06-1), which is added to injectable Human Serum Albumin (HSA) solutions to stabilize albumin against thermal denaturation during mandatory 60 °C / 10-hour pasteurization, and is also used as an oral intestinal permeation enhancer for therapeutic peptides.
Compendial grades require strict verification of chromatographic C8 assay (>= 98.0% or >= 99.0%), related fatty acid impurities, elemental impurities (ICH Q3D), water content, sulfated ash, bacterial endotoxins, and GMP/GDP traceability.

INDUSTRIAL, LUBRICANT, METALWORKING AND SANITIZER APPLICATIONS OF CAPRYLIC ACID / OCTANOIC ACID

In industrial manufacturing, Caprylic Acid / Octanoic Acid is valued for its liquid state above 16.5 °C, zero unsaturation, high Acid Value, and low-foam surface activity.
Key industrial functions include:
- Synthesizing thermal- and oxidation-resistant polyol esters (POEs) with NPG, TMP, and pentaerythritol for aviation turbines, HFC/HFO refrigeration compressors, and hydraulic systems
- Formulating alkanolamine octanoate ferrous corrosion inhibitors for water-miscible synthetic and semi-synthetic metalworking fluids with high hard-water stability
- Providing non-foaming acidic antimicrobial sanitization in dairy, brewery, and beverage CIP loops, and generating Peroxyoctanoic Acid (POOA) in equilibrium peracid disinfectants
- Producing calcium-zinc and barium-zinc octanoate heat stabilizers for PVC plastisols and linear metal octanoate catalysts for coatings and polyurethanes
- Acting as a selective oxide and carbonate mineral collector in phosphate, fluorite, and rare-earth froth flotation
- Serving as a chemical intermediate for octanoyl chloride (CAS 111-64-8), octanenitrile, and octylamine

FORMULATION AND PROCESS CONSIDERATIONS WHEN USING CAPRYLIC ACID / OCTANOIC ACID

Key process parameters to manage when handling and formulating with Caprylic Acid / Octanoic Acid include:
- Thawing and Homogenization Above 16.5 °C: Because Caprylic Acid / Octanoic Acid solidifies at 16.0–16.7 °C, containers arriving in cold weather may be partially or fully frozen. Partially frozen drums or IBCs undergo slight fractional segregation and must be completely melted in a warm room or controlled hot box (25–35 °C, never exceeding 50 °C) and mixed until homogeneous before sampling or pumping. Never apply high-wattage band heaters or direct flame.
- Controlling pH Relative to pKa (4.89): For antimicrobial sanitizers and contact herbicides requiring membrane penetration, buffer the aqueous system below pH 3.5–4.0 so >90% remains uncharged octanoic acid. For metalworking coolants and alkaline cleaners, maintain pH above 8.0–8.5 with excess alkanolamine or KOH so 100% remains water-soluble octanoate salt.
- Solubilizing Acidic Aqueous Concentrates: Because free Octanoic Acid dissolves in water at only 0.68 g/L at 20 °C, acidic sanitizer concentrates (3%–10% Caprylic Acid) require co-solvents (propylene glycol, isopropanol) and acid-stable anionic surfactants/hydrotropes (sodium octane sulfonate, diphenyl oxide disulfonates) to remain clear in the drum and upon dilution in cold hard water.
- Hard-Water Ion Management: Although far more hard-water tolerant than lauric or oleic acid, high octanoate levels in water >500 ppm CaCO3 or in the presence of Fe3+, Zn2+, or Cu2+ can form insoluble metal octanoates; include chelators (GLDA, MGDA, EDTA) where needed.
- Exotherm Control During Neutralization: Neutralizing neat Caprylic Acid with 50% NaOH, KOH, or neat MEA releases ~55–60 kJ/mol. Meter the acid gradually with jacket cooling to keep batch temperatures below 50–60 °C.
- Materials of Construction: Neat Caprylic Acid / Octanoic Acid corrodes carbon steel, cast iron, copper, brass, bronze, and zinc, picking up iron or copper that turns the liquid yellow-brown or green. Use AISI 316L (or 304) stainless steel, HDPE, polypropylene (ambient), glass-lined steel, and PTFE or perfluoroelastomer (FFKM) seals.

TYPICAL USE LEVELS AND INITIAL FORMULATION APPROACHES FOR CAPRYLIC ACID / OCTANOIC ACID

Typical starting use levels depend on the application and must be validated by laboratory testing and applicable regulations:
- Acidic food-contact CIP sanitizer concentrates: 1.0% to 10.0% w/w in concentrate; diluted to 100–400 ppm active octanoic acid in use solution (pH < 3.5)
- Metalworking fluid concentrates: 1.5% to 6.0% w/w neutralized with alkanolamines in concentrate (diluted at 3%–10% in water)
- Biopharmaceutical plasma IgG fractionation: 0.4% to 2.0% w/v (approx. 25–140 mM) at pH 4.5–5.5
- Cosmetics and personal care: 0.1% to 2.0% w/w as direct pH/soap/deodorant component; 50%–85% of reactor charge in ester synthesis
- Polyol ester and MCT synthesis: 65% to 88% w/w of reactor charge (1.02–1.15 carboxyl equivalents per polyol hydroxyl equivalent)

COMPATIBILITY AND INCOMPATIBILITY OF CAPRYLIC ACID / OCTANOIC ACID

Caprylic Acid / Octanoic Acid is fully compatible with anionic surfactants (sulfonates, sulfates, phosphate esters), amphoteric surfactants (betaines, amine oxides), and most organic solvents, alcohols, glycols, hydrocarbon oils, and ester oils.
With nonionic surfactants (such as high-EO ethoxylates or polysorbates), physical compatibility is excellent, but excess nonionic micelles in acidic sanitizers can sequester free uncharged octanoic acid and reduce antimicrobial activity unless validated by challenge testing. With cationic quaternary ammonium compounds, compatibility holds at pH < 3.5 where octanoic acid is uncharged, whereas above pH 5.5 anionic octanoate forms ion-pairs with cationic quats.
Caprylic Acid / Octanoic Acid reacts exothermically with strong bases (NaOH, KOH, concentrated amines), is incompatible with strong oxidizing agents (concentrated nitric acid, perchlorates), corrodes carbon steel, copper, brass, and zinc, and swells natural rubber, SBR, neoprene, polyurethane, and flexible PVC. Use 316L stainless steel, HDPE, PTFE, or FFKM in contact with neat acid.

CAPRYLIC ACID / OCTANOIC ACID AND CAPRIC ACID (DECANOIC ACID, C10)

Capric Acid (decanoic acid, C10H20O2, CAS 334-48-5, MW 172.26 g/mol) contains two additional carbons. While Caprylic Acid / Octanoic Acid is a liquid above 16.5 °C with an Acid Value of ~389 mg KOH/g and water solubility of 0.68 g/L, Capric Acid is a white solid at room temperature (melting point ~31.5 °C) with a lower Acid Value (325.7 mg KOH/g) and tenfold lower water solubility (~0.06–0.15 g/L).
Capric Acid requires heated storage year-round and precipitates more easily in cold hard-water sanitizers, whereas Caprylic Acid / Octanoic Acid offers liquid handling, better Gram-negative antibacterial action, and faster ketogenic metabolism in C8 MCT oils.

CAPRYLIC ACID / OCTANOIC ACID AND CAPRYLIC/CAPRIC ACID BLENDS (C8-C10)

Caprylic/Capric Acid (C8-10 Fatty Acid, CAS 68937-75-7) is a mixed distillate typically containing 55%–60% C8 and 40%–45% C10 (Acid Value ~355–368 mg KOH/g). Skipping the final C8/C10 splitter column makes the blend more economical for mixed C8/C10 MCT oil and general emollients.
However, C8-C10 blends cannot replace pure Caprylic Acid / Octanoic Acid (CAS 124-07-2) in biopharmaceutical plasma IgG fractionation, pure C8 tricaprylin synthesis, single-molecule aroma esters, or hard-water CIP sanitizers where C10 precipitates calcium caprate.

CAPRYLIC ACID / OCTANOIC ACID AND CAPROIC ACID (HEXANOIC ACID, C6)

Caproic Acid (hexanoic acid, C6H12O2, CAS 142-62-1, MW 116.16 g/mol) has a higher Acid Value (483.0 mg KOH/g) and lower freezing point (-3 °C), but suffers from an intense, offensive rancid goat/sweat odor and weak membrane-disrupting and rust-inhibiting performance due to its short C6 tail.

CAPRYLIC ACID / OCTANOIC ACID AND LAURIC ACID (DODECANOIC ACID, C12)

Lauric Acid (dodecanoic acid, C12H24O2, CAS 143-07-7, MW 200.32 g/mol) is a solid powder or flake (melting point ~44 °C, Acid Value 280.1 mg KOH/g) that forms high-foaming soaps. It cannot replace liquid Caprylic Acid / Octanoic Acid in zero-foam CIP sanitizers, low-foam metalworking fluids, or low-pour-point synthetic esters.

CAPRYLIC ACID / OCTANOIC ACID AND PELARGONIC ACID (NONANOIC ACID, C9)

Pelargonic Acid (nonanoic acid, C9H18O2, CAS 112-05-0, MW 158.24 g/mol, melting point ~12.5 °C, Acid Value 354.6 mg KOH/g) is an odd-carbon linear acid used in polyol esters, metalworking coolants, and herbicides. Caprylic Acid / Octanoic Acid provides a higher Acid Value (389.0 mg KOH/g), broader natural food/cosmetic/compendial regulatory status, and validated selectivity in plasma IgG purification.

CAPRYLIC ACID / OCTANOIC ACID AND 2-ETHYLHEXANOIC ACID (BRANCHED C8 ISOMER)

2-Ethylhexanoic Acid (2-EHA, CAS 149-57-5, MW 144.21 g/mol) shares the formula C8H16O2 and Acid Value 389.0 mg KOH/g, but features a branched C6+C2 structure with a -59 °C freezing point. Because 2-EHA is strictly petrochemical, less biodegradable, and carries reproductive toxicity classifications restricting consumer, cosmetic, food, and pharmaceutical use, linear Caprylic Acid / Octanoic Acid (CAS 124-07-2) is preferred for 2-EHA-free industrial systems and all regulated applications.

CAPRYLIC ACID / OCTANOIC ACID AND SODIUM CAPRYLATE OR MCT OIL

Sodium Caprylate (CAS 1984-06-1) is the neutral-to-alkaline water-soluble powder salt of Octanoic Acid used for dry blending and Human Serum Albumin stabilization, whereas Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5) is the neutral glycerin triester. Neither is a free carboxylic acid; Caprylic Acid / Octanoic Acid is the reactive acid raw material used to manufacture both.

QUALITY GRADES, QUALITY CONTROL AND PURCHASING CRITERIA FOR CAPRYLIC ACID / OCTANOIC ACID

Commercial Caprylic Acid / Octanoic Acid is supplied in Technical/Industrial Grade (95%–98% C8), High-Purity Fractional Grade (98% min. and 99% min. C8), Cosmetic Grade (INCI CAPRYLIC ACID, low-odor C6 <= 0.2%–0.5%), Food Grade (FCC / E570 / 21 CFR 184.1025), Pharmaceutical/Bioprocess Grade (Ph. Eur. / USP-NF / GMP excipient), and Registered Biocide/Sanitizer Grade.
Parameters to verify during incoming QC and before purchasing:
- Product name, manufacturer, and feedstock origin (vegetable coconut/palm kernel vs. synthetic)
- CAS No. 124-07-2 and EC No. 204-677-5
- Capillary GC chain distribution (C8 minimum %, C6 maximum %, C10 maximum %)
- Acid Value (typically 383–391 mg KOH/g for 98%–99% C8) and Saponification Value
- Iodine Value (<= 0.5 or <= 1.0 g I2/100 g)
- Color (APHA / Hazen or Lovibond 5.25") and heat-stability color
- Moisture / water content by Karl Fischer (<= 0.10%–0.20%)
- Solidification point / Titer (16.0–16.7 °C) and Refractive Index (nD20 ~1.4278)
- Heavy metals / elemental impurities (ICH Q3D), sulfated ash, and endotoxins (for pharma/food grades)
- Technical Data Sheet (TDS), Safety Data Sheet (SDS), and batch Certificate of Analysis (COA)
- Sector-specific compliance documents (FCC, E570, Ph. Eur./NF, Kosher, Halal, Non-GMO, BSE/TSE-free, RSPO, REACH)
The TDS defines grade specifications and typical properties, the SDS communicates GHS hazards and safe handling, and the COA reports actual measured test results for the delivered lot. All three documents should be reviewed together.

STORAGE AND HANDLING OF CAPRYLIC ACID / OCTANOIC ACID

Store Caprylic Acid / Octanoic Acid in tightly sealed original HDPE drums, IBC totes, or 316L stainless steel bulk tanks in a dry, well-ventilated indoor area at 20 to 30 degrees Celsius out of direct sunlight.
Because the product solidifies below 16.0–16.5 degrees Celsius, containers that crystallize during cold weather should be thawed completely in a warm room or controlled hot box (25–40 °C, max 50 °C) and homogenized before use to prevent fractional stratification.
Protect open containers from ambient humidity, air oxidation, and contact with carbon steel, copper, or brass equipment. Nitrogen blanketing is recommended on heated bulk storage tanks to preserve water-white APHA color.

SAFETY INFORMATION, PACKAGING AND LOGISTICS FOR CAPRYLIC ACID / OCTANOIC ACID

Undiluted Caprylic Acid / Octanoic Acid is a concentrated organic acid classified under GHS / CLP (Index No. 607-708-00-4) as causing severe skin burns and serious eye damage (Skin Corr. 1C, H314; Eye Dam. 1, H318) and harmful to aquatic life with long-lasting effects (Aquatic Chronic 3, H412).
Operators handling neat liquid must use local exhaust ventilation, chemical splash goggles with a full face shield, acid-resistant nitrile or butyl rubber gauntlets, and protective aprons. In case of eye or skin contact, flush immediately with plenty of running water for at least 15 minutes and remove contaminated clothing; if ingested, rinse mouth, do not induce vomiting, and obtain immediate medical care. Always consult the current supplier SDS.
Commercial packaging includes ~180–200 kg HDPE or phenolic-lined drums, ~850–950 kg IBC totes, and insulated heated 316L stainless steel ISO tank containers. Transport is typically regulated under Class 8 Corrosive Substances (UN 3265, Corrosive liquid, acidic, organic, n.o.s. (Octanoic acid), Packing Group III).

WHAT SHOULD BE CONSIDERED WHEN PURCHASING CAPRYLIC ACID / OCTANOIC ACID?

Instead of requesting generic 'Caprylic Acid' or 'Octanoic Acid,' buyers should define the target application, chain-purity cut, and regulatory requirements in their Request for Quotation (RFQ).
Information to clarify before purchasing:
- Target industry and functional application (lubricant ester, MWF corrosion inhibitor, CIP sanitizer, cosmetics, food/FCC, or bioprocess IgG purification)
- Exact identity (CAS 124-07-2 linear C8 vs. C8-C10 blend) and required C8 GC purity (95%, 98%, or 99% min.)
- Maximum allowable C6 hexanoic acid (for odor) and C10 decanoic acid (for water solubility and titer)
- Required Acid Value, Iodine Value, APHA color, and moisture limits
- Required quality standard and origin (100% coconut vs. palm kernel, RSPO, Kosher, Halal, FCC/E570, or Ph. Eur./NF)
- Packaging type (drums, IBCs, or bulk ISO tank), order quantity, annual volume, and delivery destination
- Required TDS, SDS, COA, and regulatory declarations, plus incumbent product TDS/COA if evaluating a replacement
Commercial pricing depends on global coconut and palm kernel oil feedstock markets, fractional distillation purity (99% C8 vs. 95% C8 or C8-C10 blend), compendial/food certification requirements, packaging format, order volume, and Class 8 dangerous-goods logistics.

CAPRYLIC ACID / OCTANOIC ACID SUPPLY FROM ATAMAN KİMYA

Caprylic Acid / Octanoic Acid (CAS No. 124-07-2, EC No. 204-677-5) is supplied for industrial esterification, synthetic lubricants, metalworking coolants, food-contact sanitizers, cosmetics, food flavoring, agriculture, and pharmaceutical bioprocessing.
Companies seeking Caprylic Acid / Octanoic Acid supply from Ataman Kimya can share their application and specification requirements to confirm grade suitability, current stock status, origin, packaging options, and commercial quotation details.
Sharing the following details in a quotation request facilitates technical evaluation:
- Application sector and intended end use
- Required C8 GC purity (95%, 98%, or 99% min.) and grade standard
- Key specification limits (Acid Value, Iodine Value, APHA color, C6/C10 limits, moisture)
- Required packaging format and estimated order quantity
- Required technical and compliance documents (TDS, SDS, COA, and sector declarations)
- Existing product TDS or COA if evaluating an alternative raw material

FREQUENTLY ASKED QUESTIONS ABOUT CAPRYLIC ACID / OCTANOIC ACID

What is Caprylic Acid / Octanoic Acid?
Caprylic Acid / Octanoic Acid is a saturated straight-chain eight-carbon monocarboxylic fatty acid with the molecular formula C8H16O2 and condensed structural formula CH3(CH2)6COOH. Identified by CAS No. 124-07-2 and EC No. 204-677-5, it is a clear, colorless to pale yellowish oily liquid above 16.5 degrees Celsius belonging to the medium-chain fatty acid (MCFA) class.

Are Caprylic Acid and Octanoic Acid the exact same chemical?
Yes. Caprylic Acid and Octanoic Acid are chemical synonyms for the same linear eight-carbon carboxylic acid (CAS 124-07-2). Octanoic Acid is the systematic IUPAC and pharmacopoeial name, while Caprylic Acid is the trivial and oleochemical industry name.

What is the CAS number of Caprylic Acid / Octanoic Acid?
The CAS Registry Number for linear Caprylic Acid / Octanoic Acid is 124-07-2. Buyers should verify this exact number because C8-C10 caprylic/capric blends carry CAS 68937-75-7 and branched 2-ethylhexanoic acid carries CAS 149-57-5.

What is the EC / EINECS number of Caprylic Acid / Octanoic Acid?
The EC / EINECS number for Caprylic Acid / Octanoic Acid is 204-677-5, and its CLP Index Number is 607-708-00-4.

What is the INCI name of Caprylic Acid / Octanoic Acid?
The INCI name used in cosmetic ingredient labeling is CAPRYLIC ACID.

What is the molecular formula and molecular weight of Caprylic Acid / Octanoic Acid?
Its molecular formula is C8H16O2 (CH3(CH2)6COOH) and its calculated molecular weight is 144.21 g/mol.

What does C8:0 mean for Caprylic Acid / Octanoic Acid?
C8:0 is the lipid shorthand notation indicating eight carbon atoms in the chain and zero carbon-carbon double bonds, confirming a fully saturated fatty acid.

What is the melting point / solidification point of Caprylic Acid / Octanoic Acid?
Pure Caprylic Acid / Octanoic Acid melts and solidifies (titer) at approximately 16.0 to 16.7 degrees Celsius (60.8 to 62.1 degrees Fahrenheit). Below 16 degrees Celsius it forms a white crystalline solid or slush.

Is Caprylic Acid / Octanoic Acid soluble in water?
Protonated Caprylic Acid / Octanoic Acid is sparingly soluble in water at approximately 0.68 g/L at 20 degrees Celsius (1.1 g/L at 60 degrees Celsius). It is freely miscible with alcohols, glycols, ethers, and oils, and dissolves readily in alkaline water (pH > 7) as octanoate salts.

What is the pKa of Caprylic Acid / Octanoic Acid?
The acid dissociation constant (pKa) of Caprylic Acid / Octanoic Acid is approximately 4.89 at 25 degrees Celsius.

What is the theoretical Acid Value of Caprylic Acid / Octanoic Acid?
The theoretical Acid Value of 100% pure C8H16O2 is 389.0 mg KOH/g. Commercial 98%–99% fractionated grades typically specify an Acid Value of 383 to 391 mg KOH/g.

What is the Iodine Value of Caprylic Acid / Octanoic Acid?
Because the C8:0 chain is completely saturated, the theoretical Iodine Value is 0.0 g I2/100 g. Commercial specifications typically set a maximum limit of <= 0.5 or <= 1.0 g I2/100 g.

How is Caprylic Acid / Octanoic Acid produced commercially?
It is primarily manufactured by high-pressure steam hydrolysis of coconut oil or palm kernel oil followed by vacuum fractional distillation to isolate the C8 cut, or synthetically by oxidation of 1-octanol or hydroformylation of 1-heptene.

Is Caprylic Acid / Octanoic Acid the same as MCT Oil?
No. Caprylic Acid / Octanoic Acid is a free, corrosive carboxylic acid (CAS 124-07-2), whereas MCT Oil (Caprylic/Capric Triglyceride, CAS 73398-61-5) is a neutral, non-irritating glycerin triester synthesized from Caprylic and Capric Acids.

What is the difference between Caprylic Acid / Octanoic Acid and Capric Acid?
Caprylic Acid / Octanoic Acid is an 8-carbon liquid fatty acid above 16.5 °C (MW 144.21, Acid Value ~389 mg KOH/g, water solubility 0.68 g/L). Capric Acid (decanoic acid, CAS 334-48-5) is a 10-carbon solid fatty acid at room temperature (melting point ~31.5 °C, MW 172.26, Acid Value ~325.7 mg KOH/g, water solubility ~0.06–0.15 g/L).

What is the difference between Caprylic Acid / Octanoic Acid and Caprylic/Capric Acid blends?
Caprylic Acid / Octanoic Acid (CAS 124-07-2) is a single-cut C8 fraction (95% to 99%+ C8). Caprylic/Capric Acid (CAS 68937-75-7) is a mixed C8-C10 distillate (typically 55%–60% C8 and 40%–45% C10) with a lower Acid Value (~355–368 mg KOH/g).

What is the difference between Caprylic Acid / Octanoic Acid and 2-Ethylhexanoic Acid?
Both share the formula C8H16O2, but Caprylic Acid / Octanoic Acid (CAS 124-07-2) has a linear unbranched C8 chain, whereas 2-Ethylhexanoic Acid (CAS 149-57-5) is a synthetic petrochemical branched isomer (C6 chain with a C2 ethyl branch) that carries different regulatory and toxicological restrictions.

What is the difference between Caprylic Acid / Octanoic Acid and Sodium Caprylate?
Caprylic Acid / Octanoic Acid is the liquid free acid (CAS 124-07-2), whereas Sodium Caprylate (CAS 1984-06-1) is its neutralized, water-soluble white crystalline sodium salt (C8H15NaO2).

What is Caprylic Acid / Octanoic Acid used for?
It is used to manufacture polyol ester lubricants, medium-chain triglycerides (MCT oil), cosmetic emollients, amine-octanoate metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, peroxyoctanoic acid disinfectants, flavor esters, agricultural herbicides, PVC heat stabilizers, and biopharmaceutical IgG plasma fractionation reagents.

How does Caprylic Acid / Octanoic Acid work in food-contact sanitizers?
At acidic pH (< 3.5–4.0), uncharged Octanoic Acid penetrates microbial cell membranes and dissociates inside the neutral cytoplasm, collapsing intracellular pH and killing bacteria and yeasts without generating foam in CIP spray systems.

Why is Caprylic Acid / Octanoic Acid used in biopharmaceutical IgG purification?
Added to blood plasma or fermentation harvest at pH 4.5–5.5, compendial Octanoic Acid selectively precipitates non-IgG proteins (albumin, lipoproteins, alpha/beta globulins) and inactivates lipid-enveloped viruses while leaving Immunoglobulin G (IgG) in solution.

How is Caprylic Acid / Octanoic Acid used in metalworking fluids?
When neutralized with alkanolamines (MEA, TEA, AMP) at pH 8.5–9.8, it forms low-foaming amine octanoate salts that inhibit flash rust on ferrous metals and resist calcium-soap precipitation in hard water.

Is Caprylic Acid / Octanoic Acid used in cosmetics?
Yes. Cosmetic Grade Caprylic Acid (INCI: CAPRYLIC ACID) is used as a pH adjuster, cleanser soap component, deodorant co-active, and raw material for lightweight emollient esters.

Is Caprylic Acid / Octanoic Acid used in food applications?
Yes, when supplied in Food Grade (FCC / E570 / 21 CFR 184.1025 / FEMA 2799) compliance, where it serves as a cheese/dairy flavoring agent, defoaming/processing aid, and feedstock for nutritional C8 MCT oil.

Does Caprylic Acid / Octanoic Acid corrode carbon steel or copper?
Yes. Neat Caprylic Acid / Octanoic Acid corrodes carbon steel, cast iron, copper, brass, and zinc, causing iron or copper discoloration. Storage tanks and transfer equipment should be constructed of 316L (or 304) stainless steel, HDPE, or PTFE.

Why did my Caprylic Acid / Octanoic Acid solidify in winter storage?
Because its natural freezing point (titer) is 16.0 to 16.7 degrees Celsius, warehouse temperatures below 16 degrees Celsius cause crystallization. Gentle thawing in a warm room or hot box (25–35 °C) followed by mixing restores full liquid homogeneity.

What documents should be requested when purchasing Caprylic Acid / Octanoic Acid?
Request the Technical Data Sheet (TDS), Safety Data Sheet (SDS), and batch Certificate of Analysis (COA), along with applicable Food/FCC/E570, Ph. Eur./NF, Kosher, Halal, Non-GMO, Allergen, BSE/TSE, or RSPO declarations.

What determines the price of Caprylic Acid / Octanoic Acid?
Pricing depends on coconut and palm kernel oil feedstock costs, C8 fractional distillation purity (99% vs. 98% vs. 95% C8), regulatory grade (pharma/food vs. technical), packaging type, order volume, and Class 8 dangerous-goods logistics.

CAPRYLIC ACID / OCTANOIC ACID – TECHNICAL SUMMARY

Caprylic Acid / Octanoic Acid, known as Kaprilik Asit or Oktanoik Asit in Turkish, is a saturated straight-chain eight-carbon monocarboxylic fatty acid with the molecular formula C8H16O2 (CH3(CH2)6COOH) and a molecular weight of 144.21 g/mol. Identified under CAS No. 124-07-2, EC / EINECS No. 204-677-5, CLP Index No. 607-708-00-4, INCI name CAPRYLIC ACID, and FEMA No. 2799, it is supplied as a clear, colorless to pale yellow oily liquid above its solidification point of 16.0 to 16.7 degrees Celsius.
Produced primarily by high-pressure steam hydrolysis and vacuum fractional distillation of coconut and palm kernel oils—or synthetically via 1-octanol oxidation and 1-heptene hydroformylation—Caprylic Acid / Octanoic Acid combines liquid handling, zero olefinic unsaturation (C8:0), a high theoretical Acid Value of 389.0 mg KOH/g, and pH-responsive amphiphilic behavior (pKa 4.89).

It is used across synthetic polyol ester lubricants, alkanolamine metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, biopharmaceutical plasma IgG fractionation, cosmetic emollients and cleansers, food flavorings and C8 MCT oils (FCC / E570 / 21 CFR 184.1025), agricultural contact herbicides, PVC heat stabilizers, and mineral flotation.
Because commercial C8 fatty acid products vary in GC chain purity (95%, 98%, and 99%+ C8) and must be distinguished from Caprylic/Capric Acid blends (CAS 68937-75-7), branched 2-ethylhexanoic acid (CAS 149-57-5), Sodium Caprylate (CAS 1984-06-1), and neutral MCT oil (CAS 73398-61-5), buyers should verify capillary GC distribution, Acid Value, Saponification Value, Iodine Value, APHA color, moisture, and regulatory compliance on the TDS and COA.
Companies planning to source Caprylic Acid / Octanoic Acid from Ataman Kimya are advised to share their intended application, required C8 purity grade, specification limits, documentation needs, packaging preference, and order quantity to confirm availability and quotation details.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com