Poly γ-glutamic acid (γ-PGA) is a water-soluble, biodegradable, elible and non-toxic toward humans and the environment. Theirefore, potential applications of y-PGA and its derivatives have been of interest in the past few years in a broad range of industrial fields such as food, cosmetics, medicine and water treatment. y-PGA and its derivatives offer a wide range of unique applications including being used as biopolymer flocculants, thickener, humectant, sustained-release material, drug carrier,...