Process for producing xanthomonas polysaccharide on a soybean whey medium

A process for the production of Xanthomonas Polysaccharide which comprises culturing a strain of the bacterium Xanthomonas campestris in a soybean whey medium and recovering the Xanthomonas polysaccharide, said soybean whey medium being obtained by extracting water soluble constituents from defatted soybeans with water to give an aqueous product, precipitating proteins from the resulting aqueous product at the isoelectric point with acids, removing the proteins thus precipitated to obtain a supernatant liquid, neutralizing the resulting supernatant liquid with an alkali, and then adding to the resulting soybean whey liquid an amount of glucose and/or sucrose suitable for the culture of Xanthomonas campestris.