Mono- and diglycerides of fatty acids

Mono- and diglycerides of fatty acids (E471) are partial glycerol esters of fatty acids produced by glycerolysis of natural triglycerides (vegetable oils or animal fats) or by direct esterification of glycerol with fatty acids. The resulting mixture contains monoglycerides (one fatty acid esterified to glycerol, approximately 40–60% of the commercial product) and diglycerides (two fatty acids, approximately 30–40%), with minor triglyceride and free glycerol fractions. As partial esters, they are amphiphilic emulsifiers with an HLB range of 2–7 depending on fatty acid composition, making them primarily water-in-oil emulsifiers suitable for fat-continuous systems. They are the highest-volume food emulsifier globally, used in bread and baked goods (anti-staling by complexing with amylose, improving dough handling), margarine, ice cream, chocolate, processed meats, and dairy products.

JECFA has assigned mono- and diglycerides of fatty acids a not-specified ADI, as they are chemically and metabolically equivalent to intermediate products of normal triglyceride digestion (evaluated 1965 and confirmed in 1974). When ingested, monoglycerides are hydrolysed in the intestine by lipases to glycerol and free fatty acids — the same products generated from dietary triglycerides — and are absorbed and metabolised identically. The fatty acid composition of E471 reflects the source oil: soy, sunflower, rapeseed, or palm oil are typical, with palm-derived emulsifiers dominating by volume due to their semi-solid consistency at room temperature. The European Food Safety Authority has confirmed the not-specified ADI in its re-evaluation programme.

E471 is authorised under EU Regulation (EC) No 1333/2008 at quantum satis in most food categories and holds GRAS status in the United States under FDA 21 CFR §182.4505. A relevant consideration for certain consumers is the saturated fat content of palm-derived mono- and diglycerides, which contributes to cardiovascular risk if consumed in large quantities, though the emulsifier quantities in food are typically small. A separate labelling concern arises from E471 potentially being derived from pork fat, making it unsuitable for strict halal or kosher consumers without source verification — in the EU, source declaration is not currently required for E471.