کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
301240 512500 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bioethanol production from sweet potato by co-immobilization of saccharolytic molds and Saccharomyces cerevisiae
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Bioethanol production from sweet potato by co-immobilization of saccharolytic molds and Saccharomyces cerevisiae
چکیده انگلیسی

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.


► We develop and evaluate a single-step system for bioethanol fermentation.
► This system was using a co-immobilization method for the fungi and yeast.
► The mixed blends of molds and S. cerevisiae gave the highest ethanol yields.
► The maximum ethanol production was 4.08% (v v−1) when the Aspergillus:Monascus (A:M) ratio was 1:2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 39, Issue 1, March 2012, Pages 216–222
نویسندگان
, , , ,