Fermentation was performing in 250 ml erlenmeyer stirred flasks which were used as a batch reactor under anaerobic conditions. Free yeast and immobilized pAAm-Sc-4 capsules, were pretreated in aqueous phosphate buffer solution (0.1 M, pH 7.2)containing 3% glucose, 0.1% urea, 0.3% yeast extract, 0.3% maltextract. Soluble starch (3% w/w) was used as feedstock