Journal
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 84-6, Issue -, Pages 801-808Publisher
HUMANA PRESS INC
DOI: 10.1385/ABAB:84-86:1-9:801
Keywords
xylitol; hydrolysate; acetic acid; k(L)a; pH
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Precipitated sugarcane bagasse hemicellulosic hydrolysate containing acetic acid was fermented by Candida guilliermondii FTI 20037 under different operational conditions (pH 4.0 and 7.0, three aeration rates). At pH 7.0 and k(L)a of 10 (0.75 vvm) and 22.5/h (3.0 vvm) the acetic acid had not been consumed until the end of the fermentations, whereas at the same pH and k(L)a of 35/h (4.5 vvm) the acid was rapidly consumed and acetic acid inhibition was not important. On the other hand, fermentations at an initial pH of 4.0 and k(L)a of 22.5 and 35/h required less time for the acid up take than fermentations at k(L)a of 10/h. The acetic acid assimilation by the yeast indicates the ability of ti;is strain to ferment in partially df toxified medium, making possible the utilization of the sugarcane bagasse hydrolysate in this bioprocess. The effects on xylitol yield and production are reported.
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