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- Title
KINETICS OF BIOETHANOL PRODUCTION FROM WHEAT MILLING BY-PRODUCTS.
- Authors
Das Neves, Marcos Antonio; Shimizu, Naoto; Kimura, Toshinori; Shiiba, Kiwamu
- Abstract
An overview of the potential application of wheat milling by-products as substrate for bioethanol production is presented. In order to select a suitable microorganism, model fermentations were conducted using glucose and dry baker's yeast. The overall ethanol yield was nearly stable (ca. 0.35 g/g), independent of mash glucose concentration; mashes with 100 g glucose/L resulted in an overall ethanol productivity of 3.48 g/L·h. Slurries containing low-grade wheat flour (LG) (100, 200 or 300 g/L) were used for simultaneous saccharification and fermentation (SSF) with Zymomonas mobilis. Fermentation performance was evaluated based on ethanol concentration (P ), productivity (Qv ), yield (YP/S ), production rate (Qp ) and glucose consumption rate (Qs ). Mashes containing 200 g LG/L produced about 52 g ethanol/L, with Qv of 2.17 g/L·h. Based on the relatively high fermentation rate of LG, reaching peak ethanol productivity within ca. 9 h of SSF, considerable savings on fermentation time was achieved. Using Z. mobilis for LG fermentation, P was about 30% higher than that obtained with Saccharomyces cerevisiae.
- Subjects
BIOCHEMICAL engineering; WHEAT products; FERMENTATION; ALCOHOL; LEAVENING agents; GLUCOSE
- Publication
Journal of Food Process Engineering, 2007, Vol 30, Issue 3, p338
- ISSN
0145-8876
- Publication type
Article
- DOI
10.1111/j.1745-4530.2007.00113.x