Flocculation properties of xanthan produced by Xanthomonas campestris

Xanthan had a flocculating activity in a kaolin suspension and high flocculating activity was obtained in the suspension (pH 7.0) adding Al super(3+), Fe super(2+) or Fe super(2+). Xanthan had high flocculating activity not only in other inorganic suspensions such as active carbon and acid clay but also in organic suspensions of cellulose and yeast. From these flocculation properties, xanthan is anticipated to be utilized in wide areas as a new biodegradable, harmless biopolymer flocculant.