Glucono delta-lactone (GDL) E575 is a lactone (cyclic ester) of D-gluconic acid.

GDL / Glucono-Delta-Lactone E575 also known as gluconolactone, is a food additive with the E number E575. It is used as a sequestrant, an acidifier, or a curing, pickling, or leavening agent. It is a lactone (cyclic ester) of D-gluconic acid. Pure GDL is a white odorless crystalline powder. GDL is commonly found in honey, fruit juices, personal lubricants, and wine. GDL is neutral, but hydrolyses in water to gluconic acid which is acidic, adding a tangy taste to foods, though it has roughly a third of the sourness of citric acid.

Physical and Chemical characteristics:
Pure GDL is a white odorless crystalline powder.
Glucono Delta-Lactone is soluble in water.
Application:
Glucono delta lactone is using in food industry with some functions as follow:
1, Make bean products
2, Improve the flavour of frying food and save the oil.
3, Improve the taste and quality of cakes
4, Fermentation
5, Pigment stabilizer
6, Antisepis
7, Souring agent
8, Condiment
9, Improve the quality of bread
10, Acidifier