Isolation ofβ-glucan from the cell wall ofSaccharomyces cerevisiae

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Abstract
β-Glucan, one of the major cell wall components of Saccharomyces cerevisiae (S. cerevisiae), has been found to enhance immune functions. At present study, we developed an optimal procedure to extract and purify β-glucan. At first, yeast cells were grown in sabouraud dextrose agar and then cultured in yeast extract–peptone–glucose (YPG) broth. After incubation, cells were harvested, washed and disrupted by means of sonication method. The obtained cell walls were used to prepare alkali-soluble β-glucan (glucan-S1). In this regard, 2% sodium hydroxide (NaOH) and 3% acetic acid were used in alkaline–acid extraction, respectively. This preparation contained 2.4% protein. In the next step, DEAE sephacel chromatography was used to remove remaining proteins (glucan-S2). Subsequently this preparation was applied into concanavalin-A sepharose column to remove manann. Finally, β-glucan free of mannoprotein complexes was prepared (glucan-S3).

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