Acetylated starch

Acetylated starch is produced by treating native starch with acetic anhydride or vinyl acetate, introducing acetyl groups that disrupt hydrogen bonding between starch chains. This modification lowers the gelatinisation temperature, reduces retrogradation, improves gel clarity, and enhances film-forming properties compared to native starch. As a food additive (E1420), it is used as a thickener and stabiliser in canned soups, sauces, instant noodles, salad dressings, and confectionery coatings.

JECFA evaluated acetylated starch in 1981 and did not establish a numerical ADI. Acetyl groups are present at the maximum substitution level defined by regulation — far below any level affecting digestibility. They are metabolised to acetic acid, a normal metabolite found in every fermented food and produced continuously in the human gut.

Acetylated starch is approved in the EU (E1420), the United States (GRAS), and globally. It is particularly common in Asian food products, including instant noodles, rice-based snacks, and clear dessert gels, where a smooth, transparent texture is valued. Wheat-derived versions may contain trace gluten; consumers managing coeliac disease should confirm the starch source. No adverse effects have been identified at dietary levels.