Abstract
Crude mannans extracted from Candida albicans and Saccharomyces cerevisiae by autoclaving yeast cells in citrate buffer (pH 7.0) according to Peat's method, were fractionated repeatedly by column chromatography on DEAE-Sephadex, acetate form, yielding neutral and acidic mannans. The former fraction showed a single peak by boundary electrophoresis and ultracentrifugal analysis, while the latter contained small amounts of phosphorus and protein. Using purified mannans as controls, various serological experiments were carried out with mannan antigens extracted from C. albicans with 45% phenol water and with 3% NaOH. No remarkable differences were observed in the antigenic activity of 4 mannan antigens from C. albicans, and the purified mannan exhibited very high antigenic activity. It was found that the mannan of S. cerevisiae was antigenically less specific than that of C. albicans mannan. The difference in serological specificity between mannans of both species may reflect not only differences in mannopyranose linkages but differences in the structure of the macromolecules.
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