... of gamma-PGA has lots of carboxyl group, which can be formed hydrogen bonding internal molecules or between different molecular ... . It has high water absorbability and moisturizing effect. gamma-PGA can be used as thickener, gel, filmogen, humectant, retarder, cosolvent, ... and anti freezer. Usage:gamma-PGA and its derivatives can be widely used in the food industry, cosmetics, health care, water ...