Overview
Glucono delta-lactone (GDL) is a naturally occurring organic compound derived from glucose oxidation. It is widely utilized in the food industry due to its mild acidic properties and slow hydrolysis into gluconic acid. As a versatile additive, GDL serves multiple functions, including pH regulation, leavening, and protein coagulation. Its non-toxic nature and gradual acid release make it ideal for controlled fermentation processes, such as tofu production and baked goods.
Physical and Chemical Properties
GDL appears as a white, odorless crystalline powder with a melting point of 153-155°C. It is highly soluble in water, forming gluconic acid, which adjusts pH without imparting strong flavors. The compound hydrolyzes slowly in aqueous solutions, making it suitable for delayed-action applications like cheese and sausage manufacturing. Its stability under dry conditions ensures a long shelf life when stored properly.
Main Applications
In food production, GDL is a key ingredient for tofu coagulation, replacing traditional salts like calcium sulfate. It ensures a smoother texture and consistent setting time. It also acts as a leavening agent in baked goods and a pH regulator in beverages. Beyond food, GDL is used in cosmetics for its chelating properties and in pharmaceuticals as an excipient.
Safety and Storage
GDL is classified as GRAS by the FDA and is safe for consumption within recommended limits. Proper storage in moisture-proof containers is essential to prevent premature hydrolysis. Workers should use standard protective equipment (gloves, masks) to avoid minor irritation from dust. Spills can be cleaned with water due to its high solubility.
B2B Procurement Guide
Buyers should prioritize suppliers offering food-grade GDL (≥99% purity) with clear documentation of CAS 90-80-2. Bulk purchases (25kg bags or drums) typically reduce costs by 10-20%. Verify certifications like ISO 9001 and Kosher/Halal compliance if required. Sample testing for solubility and acidification rate is recommended for critical applications like tofu production.
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