Production of Polysaccharides and Lipids by Four Oleaginous Yeasts in Corncob Hydrolysate with Acetic Acid
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Abstract:
In order to study the influence of high-concentration acetic acid in lignocellulosic hydrolysates on fermentation by oleaginous yeast, four oleaginous yeasts (Trichosporon cutaneum, Cryptococcus albidus, Trichosporon dermatis, and Trichosporon coremiiforme) were chosenand corncob hydrolysate with the addition of high-concentration acetic acid was used as the fermentation substrate to explore patterns in substrate metabolism and product accumulation during fermentation.Sugars and acetic acid in the fermentation media could be almost completely metabolized by T. cutaneum and T. dermatis, but T. coremiiforme and C. albidus showed little metabolism effect on sugars and organic acids. Besides efficiently reducing the chemical oxygen demand (COD) of the medium with high substrate concentration, T. cutaneum and T. dermatis synthesized a certain concentration of extracellular polysaccharide products. The fatty acids of the four oleaginous yeasts were mainly composed of C16 and C18 series, and the proportion of oleic acid (C18:1) was the highest; in addition to microbial oil, they also accumulated a large amount of polysaccharide and a small amount of protein and ash. This study provides a reference for the production of yeast polysaccharide and microbial oil from low-cost raw materials using oleaginous yeasts.
