... -glutamic Acid Gamma-poly-glutamic Acid IntroductionGamma-poly-glutamic acid (γ-PGA) is a natural, multi-functional, biodegradable biopolymer produced through a ... molecular. It has high water absorbability and moisturizing effect. g-PGA can be used as thickener, gel, filmogen, humectant, retarder, ... analyzerpH5.0~7.0Clarity, OD400 (4% aq. sol’n)0.07 max.Heavy metals (total as Pb)10 ppm max.TPC ...