Patent ID: 7320884

Claim:
A process for making a color and odor stable polycarboxylic acid or a polyhydoxy acid comprising: (a) providing an organism for producing a polycarboxylic acid or a polyhydroxy acid; (b) providing a substrate for conversion to a polycarboxylic acid or a polyhydroxy acid by the organism; (c) providing a fermentation medium consisting of: (i) a source of metabolizable carbon and energy; (ii) a source of inorganic nitrogen selected from the group consisting of ammonia, ammonium hydroxide, ammonium sulphate, and mixtures thereof; (iii) potassium phosphate; (iv) at least one metal selected from the group consisting of an alkali metal, an alkaline earth metal, a transition metal, and mixtures thereof; (v) a source of biotin, substantially free of particulate matter and bacteria; (vi) at least one chelating agent; and (vii) an antifoam agent; and (d) fermenting a mixture comprising said organism, substrate and fermentation medium of (a), (b) and (c) at a pH 5.4 to 7.