Glucono-Delta-Lactone(GDL):
1. Physical and Chemical characteristics of Glucono-Delta-Latone:
White crystalline powder, almost odorless, freely soluble in water(60g/ml), has a slightly sweet taste, then sour, sparingly soluble in ethyl alcohol(1g/100ml), almost insoluble ether. Upon addition to water readily forms an mixture of the lactone gdl and gluconic acid. 1% solution PH is 3.5, after 2H, PH is 2.5.
Molecular formula of Glucono-Delta-lactone: C6H10O6

2. Quality standard FCCIV USP24 E575
Item Standard:
Appearance White crystal powers
Assay % Min 99.0
Arsenic % Max 0.0003
Heavy metals % Max 0.0002
Lead % Max 0.001
Sulphate % Max 0.03
ChlReducing substances % Max 0.5