... surface active agent,thickener,emulsifier,bubble stabilizer Propylene glycol alginate (PGA)PGA is one novel food additive made of alginic acid through ... is insoluble in organic solvent ethanol.Besides its thickening property, PGA has function of surface active agent, used as emulsifier ... function for greasy colloid and it is acid resistant. Because PGA is nonionic compound, it is stable for some metal ...