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Selection of thermotolerant yeast strains Saccharomyces cerevisiae for bioethanol production

Paper ID Volume ID Publish Year Pages File Format Full-Text
17732 42692 2008 4 PDF Available
Title
Selection of thermotolerant yeast strains Saccharomyces cerevisiae for bioethanol production
Abstract

The simultaneous saccharification and fermentation (SSF) process of lignocellulosic materials requires the utilization of microorganisms capable of working at high temperatures. The selection of Saccharomyces cerevisiae strains able to ferment sugars obtained from lignocellulosic material at temperatures above 35 °C with high ethanol yield has become a necessity. In this work, 11 S. cerevisiae strains were screened for their ability to grow and ferment glucose in a temperature range of 35–45 °C. All the strains grew (in agar plates) at 35 and 40 °C, only two strains grew at 42 °C, and no strain grew at 45 °C. The yeasts were placed in a liquid medium, and incubated at 35, 40 and 42 °C. Glucose-to-ethanol conversion yield was between 50% and 80% of the theoretical value. Strains that produced at least 70% of the theoretical ethanol yield were submitted to two acclimatization treatments. One pure yeast strain was isolated (IR2-9a). For bleached kraft pulp as well as organosolv-pretreated Pinus radiata chips, the ethanol yields by SSF using the IR2-9a strain were higher than those obtained using the control yeast.

Keywords
Bioethanol; Biomass; Saccharomyces cerevisiae; Thermotolerant yeast
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Selection of thermotolerant yeast strains Saccharomyces cerevisiae for bioethanol production
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 43, Issue 2, 5 August 2008, Pages 120–123
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us