E575: Glucono-delta-lactone
What is E575?
Glucono-delta-lactone (E575), or GDL, is a neutral-tasting white powder that slowly reacts with water to form gluconic acid. This gradual change makes it a slow-release acidifier.
Origin and production
It is made by oxidising glucose, usually from corn starch, using fermentation or enzymes to produce gluconic acid, which is then crystallised into the lactone form.
Why is it used?
Because its acidity develops gradually, GDL is used to coagulate silken tofu, as a leavening acid in cakes and baking mixes, and to help cure and set fermented sausages. It also regulates acidity in dips and sauces.
Vegan, vegetarian and halal
GDL is produced from plant-derived glucose and is suitable for vegans and vegetarians.
Safety and regulation
E575 is authorised in the EU for general use and has been evaluated by EFSA. Gluconic acid occurs naturally in honey, fruit and wine.
Written by the Foodlas editorial team with AI assistance and checked against EU Regulation (EC) No 1333/2008 and EFSA scientific opinions. Last reviewed: October 14, 2026.
Sources: Regulation (EC) No 1333/2008 · EFSA — Food additives · Wikidata
Common in
Products containing E575
