Bioethanol production from sweet potato by co-immobilization of saccharolytic molds and Saccharomyces cerevisiae
Resource
RENEWABLE ENERGY, 39(1), 216-222
Journal
Renewable Energy
Pages
216-222
Date Issued
2012
Date
2012
Author(s)
Lee, Wen-Shiang
Chen, I-Chu
Chang, Cheng-Hsiung
Yang, Shang-Shyng
Abstract
To investigate the bioethanol production from sweet potato, the saccharification and fermentation conditions of co-immobilization of saccharolytic molds (Aspergillus oryzae and Monascus purpureus) with Saccharomyces cerevisiae were analyzed. The immobilized yeast cells showed that at 10% glucose YPD (yeast extract peptone dextrose) the maximum fermentation rate was 80.23%. Viability of yeasts cells were 95.70% at a final ethanol concentration of 6%. Immobilization enhanced the ethanol tolerance of yeast cells. In co-immobilization of S. cerevisiae with A. oryzae or M. purpureus, the optimal hardening time of gel beads was between 15 and 60 min. Bioethanol production was 3.05-3.17% (v v-1) and the YE/s (yield of ethanol production/starch consumption) was 0.31-0.37 at pH 4, 30 °C and 150 rpm during 13 days fermentation period. Co-immobilization of S. cerevisiae with a mixed cultures of A. oryzae and M. purpureus at a ratio of 2:1, the bioethanol production was 3.84% (v v-1), and the YE/s was 0.39 for a 11 days incubation. However a ratio of A. oryzae and M. purpureus at 1:2 resulted a bioethanol production rate of 4.08% (v v-1), and a YE/s of 0.41 after 9 days of fermentation. © 2011 Elsevier Ltd.
Subjects
Aspergillus oryzae; Bioethanol; Co-immobilization; Monascus purpureus; Saccharomyces cerevisiae; Sweet potato
SDGs
Other Subjects
Aspergillus Oryzae; Bio-ethanol production; Coimmobilization; Ethanol concentrations; Ethanol production; Ethanol tolerance; Fermentation rate; Gel beads; Immobilized yeasts; Mixed cultures; Monascus purpureus; S.cerevisiae; Sweet potato; Yeast cell; Yeast extracts; Aspergillus; Bioethanol; Cells; Ethanol; Fermentation; Glucose; Molds; Saccharification; Yeast; Cell immobilization; biofuel; biomass power; dicotyledon; energy resource; ethanol; fermentation; immobilization; renewable resource; starch; yeast; Aspergillus oryzae; Ipomoea batatas; Monascus purpureus; Saccharomyces cerevisiae
Type
journal article
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