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Monoglycerides, also known as monoacylglycerols (MAGs), are a class of glycerides consisting of a single fatty acid chain esterified to a glycerol backbone.
They represent one of the simplest types of lipid molecules that occur naturally in biological systems and are widely used in food, pharmaceutical, and industrial applications.
CAS Number: 123-94-4 (for general monoglycerides, especially glyceryl monostearate)
Synonyms:
Glycerol monostearate (GMS),Glyceryl monoester,1-Monoacylglycerol
Monoglyceride ester,Glyceryl monopalmitate (specific forms)
The general term monoglyceride refers to all glycerol esters with a single fatty acid chain, though in practice glyceryl monostearate is often the most representative example.
Historical Development
The study of monoglycerides dates back to the late 19th century, when lipids and fats were systematically analyzed in terms of their chemical structures.
Early chemists, including Berthelot and Chevreul, contributed to understanding fatty acid–glycerol interactions.
By the mid-20th century, monoglycerides were recognized as important emulsifiers in food technology.
Their production expanded significantly during the industrial revolution in food processing, particularly in bakery, margarine, and dairy products.
Chemical Properties
Molecular Structure
General formula: C₃H₈O₃-x(CₙH₂ₙ₊₁COO)
Core unit: glycerol (propane-1,2,3-triol).
One hydroxyl group esterified with a fatty acid.
Can exist as 1-monoacylglycerol or 2-monoacylglycerol (positional isomers).
Physical Properties
Appearance: white to off-white, waxy solid (for GMS).
Solubility: Insoluble in water, soluble in ethanol, acetone, and oils.
Melting point: 58–65 °C (for glyceryl monostearate).
Amphiphilic nature: has both hydrophilic and lipophilic domains.
Chemical Behavior
Hydrolysis: yields glycerol and free fatty acid.
Esterification: produced by glycerol–fatty acid esterification.
Stability: stable under normal conditions; sensitive to strong oxidizing agents.
Production Methods
Natural Occurrence
Monoglycerides are produced naturally during the enzymatic digestion of dietary fats by lipases, particularly pancreatic lipase.
They appear as intermediates in lipid metabolism.
Industrial Synthesis
Direct esterification of glycerol with fatty acids under acidic catalysis.
Glycerolysis of triglycerides using glycerol and triglyceride sources.
Enzymatic methods employing lipase enzymes for regioselective synthesis of 1- or 2-MAG.
Fractionation and purification for achieving food-grade emulsifier purity.
Applications
Food Industry
Widely used as emulsifiers in bakery, margarine, ice cream, and dairy.
Improve dough stability, retard staling, and enhance texture.
Used in beverages for cloud stabilization.
Pharmaceutical Applications
Act as excipients and drug carriers.
Enhance bioavailability of poorly soluble drugs.
Used in topical formulations, suppositories, and controlled-release systems.
Cosmetics and Personal Care
Serve as emollients, stabilizers, and thickening agents.
Found in creams, lotions, and hair products.
Industrial Applications
Used in biodegradable lubricants.
Act as antistatic agents and plastic additives.
Serve as surfactants in agrochemicals.
Biological Role and Metabolism
Monoglycerides are key intermediates in lipid metabolism:
Produced during triglyceride digestion.
Absorbed in the small intestine via micelle formation.
Converted back into triglycerides within enterocytes.
Play roles in signaling pathways and energy storage.
Analytical Methods
Chromatography (HPLC, GC, TLC): to separate and quantify MAGs.
NMR spectroscopy: to determine positional isomers (1- vs 2-MAG).
Mass spectrometry: to analyze molecular weight and structure.
FTIR: to characterize ester bonds.
Advantages and Limitations
Advantages
Biodegradable, safe, and naturally occurring.
Amphiphilic structure allows emulsification.
Versatile across industries.
Limitations
Susceptible to oxidation.
Limited solubility in water.
Performance depends on fatty acid chain length and degree of saturation.
SAFETY INFORMATION ABOUT MONOGLYCERIDE
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
