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Introduction
E482, known as CSL (calcium stearoyl lactylate), is the calcium salt of stearoyl lactylic acid. It is chemically similar to E481 (sodium stearoyl lactylate) but with calcium instead of sodium. The molecule contains a stearic acid tail, a lactyl head group (1-3 lactic acid units), and a calcium counterion. The HLB value is approximately 8-10 (slightly lower than SSL because calcium is divalent and forms stronger interactions). E482 is used primarily as a dough conditioner in bread and as a crumb softener, similar to E481. However, calcium stearoyl lactylate has some distinct advantages: it provides calcium fortification (unlike SSL), and it has a firmer, less hygroscopic texture. E482 is approved in EU, USA (21 CFR 172.844), Japan, and Codex.
CAS Number
5793-94-2 (calcium stearoyl-2-lactylate). Also 93618-67-8 (calcium stearoyl lactylate mixture).
Synonyms
Calcium stearoyl lactylate, CSL, Calcium stearoyl-2-lactylate, E482.
Topic Headings
1. Mechanism of action and differences from SSL (detailed paragraph form)
Like SSL, E482 functions as both a dough strengthener and a crumb softener. However, the presence of calcium (Ca²⁺) instead of sodium (Na⁺) introduces important differences. Calcium ions can form ionic bridges between the negatively charged lactylate head groups and negatively charged phosphate groups on gluten proteins (via calcium's divalent nature). This creates a stronger protein network than SSL alone. Additionally, calcium strengthens cell walls in yeast and improves yeast tolerance to osmotic stress, which is beneficial in high-sugar doughs. On the other hand, calcium can also activate proteolytic enzymes (proteases) that break down gluten; therefore, E482 must be carefully dosed to avoid over-softening of dough. At optimal levels (0.3-0.5% flour basis), E482 gives bread with 15-20% higher volume than control and 35% softer crumb after 7 days. Compared to SSL, E482 produces slightly lower volume but better crust color and a firmer, more sliceable crumb (less fragile). E482 is also less hygroscopic than SSL, making it easier to handle in humid environments. In calcium-fortified breads, E482 can contribute 20-30 mg of calcium per slice (about 2-3% of daily value), providing a nutritional benefit not available with SSL.
2. Chemical and physical properties (list form)
• Appearance — White to cream-colored powder, free-flowing or granular.
• Odor — Characteristic mild, caramel-like odor (less pronounced than SSL).
• Melting range — 45-55°C (similar to SSL).
• Solubility — Dispersible in warm water (forms slightly cloudy dispersion); soluble in warm oil (>50°C); sparingly soluble in cold water; partially soluble in ethanol.
• HLB value — 8-10 (moderately hydrophilic; lower than SSL).
• pH (2% aqueous dispersion) — 5.0-7.0 (slightly more acidic than SSL).
• Calcium content — 5-7% (typically 5.5-6.5%).
• Lactic acid content — 30-40%.
• Stearic acid content — 40-50%.
• Acid value — 50-80 mg KOH/g (lower than SSL due to calcium salt formation).
• Ester value — 140-200 mg KOH/g.
• Bulk density — 0.5-0.7 g/cm³ (slightly denser than SSL).
• Hygroscopicity — Low to moderate (less hygroscopic than SSL; does not cake easily).
• Particle size — Typically 100-300 microns.
3. Manufacturing process and quality control (paragraph form)
The manufacturing process for E482 is similar to that of E481, with the key difference being the neutralization step. First, stearic acid is reacted with lactic acid (100-150°C, vacuum, 2-6 hours) to form stearoyl lactylic acid. The reaction produces a mixture with 1, 2, and 3 lactic acid units. Second, the stearoyl lactylic acid is neutralized with calcium hydroxide or calcium carbonate in water or alcohol at 70-90°C. Calcium hydroxide is preferred because it reacts more rapidly, but it requires careful control to avoid over-neutralization (excess calcium can form calcium soaps). The neutralized product is then dried (spray drying, fluid bed drying, or vacuum drying) and milled to the desired particle size. Some manufacturers add a small amount of tricalcium phosphate or silicon dioxide (1-2%) as an anticaking agent. Quality control parameters include calcium content (by atomic absorption or EDTA titration), residual lactic acid (<5%), free stearic acid (<3%), and calcium hydroxide residue (<0.5%). The product is typically packaged in moisture-proof multi-layer bags (paper/polyethylene/foil) to maintain free-flowing properties. Shelf life is 12-18 months under dry, cool conditions.
4. Applications and typical usage levels (list form)
• White pan bread and rolls — 0.3-0.5% (flour basis) increases volume by 15-20%; reduces staling by 35% over 7 days; produces firmer, more sliceable crumb than SSL.
• Whole wheat bread — 0.4-0.7% compensates for bran-induced gluten weakening; improves texture and volume; adds calcium nutrition (20-30 mg per slice).
• High-sugar doughs (sweet rolls, brioche) — 0.3-0.5% improves yeast tolerance to osmotic stress; gives better volume in high-sugar (15-25%) formulations.
• Tortillas — 0.2-0.4% improves flexibility; prevents cracking for up to 14 days (compared to 5-7 days without).
• Croissants and Danish pastries — 0.2-0.4% improves dough sheeting properties; gives better lamination and flakiness.
• Crackers — 0.2-0.3% reduces breakage; improves stacking and packaging.
• Pasta (fresh and dried) — 0.2-0.4% reduces stickiness; improves firmness after cooking; adds calcium.
• Calcium-fortified breads and baked goods — 0.5-1.0% used specifically for calcium enrichment; provides 40-80 mg calcium per serving (4-8% DV).
• Frozen dough — 0.4-0.6% protects gluten structure during freeze-thaw; extends frozen storage life to 12 weeks.
• Pancake and waffle mixes — 0.3-0.5% improves batter consistency and texture of finished product.
5. Stability, storage, and handling (paragraph form)
E482 is more stable and easier to handle than E481 because it is less hygroscopic. When stored in sealed, dry containers below 25°C, E482 remains free-flowing for 12-18 months. Unlike SSL, it does not absorb significant moisture from the air (even at 80% relative humidity) and does not cake or form hard lumps. This makes E482 preferred in humid climates or for applications where the additive is stored for long periods. E482 is heat-stable up to 200°C, suitable for baking, frying, and extrusion. At temperatures above 220°C, it begins to caramelize and darken. It is stable at pH 5-8; at pH <4, calcium ions may precipitate as calcium lactate or calcium stearate, reducing emulsifying activity. At pH >9, saponification occurs. For best dispersion, E482 should be added to warm water (40-60°C) and mixed vigorously, or added directly to the flour during dry blending. In fat-based systems, it should be melted with the fat phase at 50-60°C. Do not store in copper or iron containers (oxidation catalyst). E482 is compatible with most food ingredients but may precipitate in the presence of high concentrations of phosphates or sulfates.
6. Regulatory status, safety, and nutritional aspects (paragraph form)
JECFA has established an ADI of 0-20 mg/kg body weight for calcium stearoyl lactylate (same as SSL). The safety profile is very similar to SSL, as both are hydrolyzed to stearic acid and lactic acid. The calcium salt form has been studied separately; no additional toxicity has been observed. Calcium from E482 is bioavailable and contributes to daily calcium intake. A typical slice of bread containing 0.5% E482 provides approximately 30 mg of calcium. For perspective, the adult daily requirement is 1000-1200 mg, so bread with E482 is not a primary calcium source but a useful supplement. EU maximum levels: 5 g/kg in bread and fine bakery wares, 2 g/kg in pasta, 5 g/kg in pancake mixes. USA: GRAS under 21 CFR 172.844 with no specific limits when used according to GMP. Unlike E481, E482 is permitted in organic foods in both the USA and EU (under restricted conditions) because calcium is a natural mineral and the additive is less processed. Individuals with calcium sensitivity (rare) or hypercalcemia (excess blood calcium) should consult a physician, but normal consumption is safe. E482 is dairy-free and lactose-free; the name "lactylate" refers to lactic acid, not lactose. No allergic reactions have been reported specifically to E482. Some consumer concerns about "calcium stearate" (which is different from stearoyl lactylate) are misplaced; E482 is not calcium stearate and has different safety and functional properties.
7. Comparison of calcium and sodium stearoyl lactylates (neutral informational list, not comparison of superiority)
• Calcium content — E482 provides 5-7% calcium by weight; E481 provides 3.5-5% sodium by weight.
• Hygroscopicity — E482 is less hygroscopic, does not cake easily; E481 is moderately hygroscopic and caking can occur.
• pH of dispersion — E482 gives pH 5.0-7.0; E481 gives pH 6.0-8.0 (slightly more alkaline).
• Handling in humid environments — E482 is preferred for tropical or humid climates.
• Effect on dough — E482 gives slightly firmer, more sliceable crumb; E481 gives slightly softer crumb.
• Calcium fortification — E482 provides nutritional calcium; E481 does not.
• Regulatory status in organics — E482 is permitted in organic foods in some jurisdictions; E481 is generally not.
• Cost — E482 is typically 10-20% more expensive than E481 due to calcium sources.
• Compatibility with other additives — E482 may precipitate with high levels of phosphates; E481 has fewer incompatibilities.
• Typical applications — Both are used in bread; E482 preferred for calcium-fortified products and high-sugar doughs; E481 preferred for standard white bread and cakes.
