Saccharomicies cerevisiae yeast growth conditions optimisation using RSM methodology for the production of β-glucan

Abstract

Aim: β-glucan is polymeric compound in which glucose monomers are linked by β glycosidic bonds. β-glucan is produced by many different organisms – bacteria, fungi, plants. It was noted that different β-glucans can effect mammals immunity and can be human immune system modulators. Many experiments showed that β-glucans can be possibly used in bacterial disease therapy and can increase immune system cells cytotoxicity against cancer tumors. An important source of immune active β-glucan is baker’s yeast Saccharomicies cerevisiae: one of the major and structurally important component of S. cerevisiae yeast cell wall component is β-(1-3, 1-6) glucan. For baker’s yeast cultivation, YEPD medium is often used, which consists of glucose, yeast extract and peptone. The aim of this work was to use usual pabular low-cost glucose for Saccharomicies cerevisiae fermentations and optimizate cultivation process conditions for maximal β-glucan yield extraction from yeast cells. Methods: To reach this aim response surface methodology (RSM) was used. Alternate medium was also used, for cultivation of Saccharomicies cerevisiae, which consists of low-cost glucose and corn steep liquor; yeast cultivation process optimization for maximum yield of β-glucan was undertaken. Results: Optimal conditions were determined and verified for both two medium types. Conclusion: Both optimized mediums can be practical used for a β-glucan production.