... mixture of the lactone gdl and gluconic acid.1% solution ph is 3.5,after 2H,PH is 2. ... 02 3UsesGDL is a kind of excellent multifunctional food additive. It is mainly used as proteincoagulant, acidifier, expander, preservative, ... seasonings, chelating agent, colour-preserver,etc. it is widely applied to food, daily chemical industry, pharmaceuticals, cosmetics ...