The effect of various carbon and nitrogen sources on the synthesis of the branched exopolysaccharide produced by Cryptococcus laurentii st 1803-K. was studied. The conditions favourable for a higher yield of the polymer were found. The carbon and nitrogen sources used do not affect the qualitative monosaccharide composition of the polysaccharide, however, the introduction of ammonium salts in the medium can cause a change in the monosaccharide ratio in the side chains of the polymer.
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