Combination of induced autolysis and sodium hypochlorite oxidation for the production of Saccharomyces cerevisiae (1→3)-β-D-glucan

(1 --> 3)-beta-D-Glucans have received much attention with respect to their biological functions. A novel method to extract (1 --> 3)-beta-D-glucan from Saccharomyces cerevisiae cell wall is proposed in present work, which is based on the combination of induced autolysis and subsequent oxidation of the autolysed cell by sodium hypochlorite to remove undesirable substances. Influences of temperature, pH value and organic solvent on S. cerevisiae FL 1 autolysis were investigated. Results indicated that each factor had its significant effect on induced autolysis and the optimal conditions were 52 degreesC, pH 5.5 and 1.5% (v/v) ethyl acetate. The kinetic behaviour of the yeast autolytic process under the optimized conditions was further studied. After 36 h of autolysis, 42.0% (w/w) cellular substances were released while the cell wall nearly remained intact. Finally, an ideal glucan yield as high as 22.9% (w/w) was obtained when S. cerevisiae FL 1 was treated by the novel method.