Starch Acetate (E1420)

About This Product

Starch acetate is tapioca starch esterified with acetic anhydride or vinyl acetate so that a proportion of the hydroxyl groups carry an acetyl substituent. It carries the additive number E1420, INS 1420, with acetyl content limited to 2.5 per cent. Unlike E1414 and E1422 it is stabilised only: there is no cross-linking, and that absence defines its use.

Acetyl groups are bulky and sit on the chain where hydrogen bonds would otherwise form. Three things follow. The granule is easier to hydrate, so gelatinisation shifts to a lower temperature than native tapioca and the starch thickens earlier and at lower energy. The cooked paste is clearer, because less ordered structure means less light scattering. And the amylose fraction is physically prevented from re-associating on storage, so the paste does not turn opaque, firm up or weep over days in a chiller or through a freeze-thaw cycle.

What it will not do is survive abuse. With no cross-links, the swollen granule ruptures under the same conditions that destroy native starch: sustained high shear, retorting, or a sauce held acidic and hot. A starch acetate put into a retorted product will give good clarity on day one and a thin, watery sauce after the autoclave.

Its proper home is therefore cold-chain products that are cooked gently. Refrigerated and frozen sauces and gravies filled at modest temperature, bakery creams and custards, fruit fillings where clarity sells the fruit, instant and cold-swelling blends where the low gelatinisation temperature is an advantage, and dairy desserts. In those applications it is cheaper than a dual-modified grade and performs better than one on clarity, because cross-linking always costs a little transparency.

It is also the lower-cost route to freeze-thaw stability where there is no thermal or mechanical challenge at all, which is a genuinely common case that is often over-specified to E1414 out of habit.

Bio Green Foods supplies starch acetate, E1420, in 25 kg bags and jumbo bags. Acetyl content, viscosity profile, gelatinisation temperature, clarity and freeze-thaw performance are confirmed on the agreed specification and on the batch certificate of analysis. It is gluten free and non-GM.