E472d — TARTARİC ACİD ESTERS OF MONO- AND DİGLYCERİDES OF FATTY ACİDS

Introduction
E472d is produced by esterifying mono- and diglycerides with tartaric acid. Tartaric acid contains two chiral centers and two carboxyl groups, resulting in a molecule that can exist in L(+), D(-), or meso forms. Commercially, L(+)-tartaric acid (naturally occurring in grapes) is used. This emulsifier is less common than E472a, b, c, e, and f but is used in specialty applications where both emulsification and acidification are needed.

E472d has an HLB value of approximately 5-7, making it a balanced emulsifier suitable for both water-in-oil and oil-in-water systems. Its primary use is in confectionery, particularly in chocolate and chocolate coatings, where it modifies fat crystallization. It is also used in some bakery products, though E472e (diacetyltartaric acid esters) is far more common in bread. E472d is approved in the EU but has limited use in the USA (not separately listed; often covered under §172.832 with citric/tartaric esters).

CAS Number
Mixture: 91052-83-3.

Synonyms
Tartaric acid esters of monoglycerides, Tartrated mono- and diglycerides, TARTEM, E472d.

Topic Headings

1. Role in chocolate and confectionery fat crystallization (detailed paragraph form)
Chocolate must be tempered to form stable beta V (Form V) cocoa butter crystals. Improper tempering leads to fat bloom — a white, powdery appearance on the chocolate surface caused by uncontrolled crystallization of unstable polymorphs. E472d acts as a crystal modifier by adsorbing onto specific crystal faces of cocoa butter. The tartaric acid portion hydrogen-bonds with existing nuclei of the beta V form, promoting growth of this desirable polymorph while inhibiting formation of beta VI (which causes bloom) and alpha crystals (which melt too easily). At 0.2-0.4% of chocolate weight, E472d reduces tempering time by 20-30% and extends bloom resistance by 3-6 months. It is particularly effective in compound coatings that use lauric fats (palm kernel, coconut oil) in place of cocoa butter. These fats have different crystallization kinetics; E472d stabilizes the beta-prime form, which gives a smooth, glossy appearance without tempering equipment.

2. Comparison with other tartaric acid derivatives (tabular form)

3. Physical properties and handling considerations (list form)

• Appearance: Off-white to light yellow waxy solid or flakes.
• Melting range: 55-65°C (varies with fatty acid composition).
• Solubility:
  • Insoluble in water
  • Sparingly soluble in cold oil
  • Soluble in warm oil (>60°C)
  • Soluble in ethanol, acetone, ethyl acetate
• Acid value: Max 15 mg KOH/g.
• Saponification value: 300-400 mg KOH/g.
• Tartaric acid content: 10-20%.
• Storage: Stable for 18 months in sealed, dry containers below 25°C. Avoid exposure to high humidity (hygroscopic).
• Preparation for use: Must be melted (65-70°C) before addition to fat phase. Do not overheat (>110°C) to prevent decomposition and darkening.

*4. Applications in reduced-fat baked goods (paragraph form)*
When fat content in cakes and cookies is reduced, the remaining fat does not adequately coat flour particles, resulting in dense, tough textures. E472d at 0.5-1.0% (flour basis) compensates for fat reduction by improving fat dispersion and air incorporation. In reduced-fat (50% less fat) pound cakes, E472d restores volume to 95% of full-fat control compared to 70% without emulsifier. It also reduces crumb hardness by 40% and increases moisture retention by 25% over 7 days. The mechanism involves E472d forming a stable film around air bubbles introduced during creaming; this film resists coalescence even with less fat to stabilize it. For cookies with 40% fat reduction, E472d improves spread ratio and reduces breakage during packaging.