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See Chinese contents: GB 7657-2020 GB 7657-2020: National food safety standard - Food additive - Glucono-delta-lactone
This Standard applies to the food additive glucono delta-lactone, which is made from the reaction of D-calcium gluconate with sulfuric acid, or from sodium gluconate, as the raw material, through dissolution, cation exchange desodiumization, concentration, crystallization, centrifugation, and drying.
