Glucono delta-lactone

Glucono delta-lactone (GDL) is a naturally occurring 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.

Production

GDL is produced by the oxidation of glucose, a simple sugar produced by many plants, most notably corn and sugarcane. The oxidation process involves the use of a variety of enzymes, including glucose oxidase and catalase. The resulting product is a white, crystalline powder that is soluble in water.

Uses

GDL is used in a variety of food applications. It is commonly used as a leavening agent in baked goods, where it slowly hydrolyses to gluconic acid, producing a controlled release of gas without the need for yeast or baking powder. This makes it particularly useful in products that require a long shelf life.

In addition to its use in baking, GDL is also used as a curing agent in the production of processed meats. It can also be used as a preservative, a pH regulator, and a sequestrant, helping to prevent the deterioration of food and extend its shelf life.

GDL is also used in the production of tofu, where it acts as a coagulant. It causes the soy milk to curdle, forming a soft gel that is then pressed into blocks.

Safety

GDL is generally recognized as safe (GRAS) by the Food and Drug Administration (FDA). It is also approved for use in food by the European Food Safety Authority (EFSA). However, like all food additives, it should be used in moderation.

See also

• Food additive
• E number
• Leavening agent
• Tofu