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Effect of zinc on ethanol production by two Thermoanaerobacter strains

Paper ID Volume ID Publish Year Pages File Format Full-Text
36637 45138 2006 6 PDF Available
Title
Effect of zinc on ethanol production by two Thermoanaerobacter strains
Abstract

Ethanol production ratios of Thermoanaerobacter ethanolicus (JW200) and two other thermophilic anaerobic bacteria Thermoanaerobacter (65-2) and Thermoanaerobacter thermohydrosulfuricus (70-1) were determined at different sucroses (15, 20 and 30 g l−1) and molasses (30, 40 and 60 g l−1) concentrations, in batch culture conditions. As a result, bacterial growth and ethanol production ratios were optimum at the same conditions. Also, effect of zinc as ZnSO4·7H2O on the ethanol formation of bacteria were investigated and it was found that, addition of 0.17 g l−1 of ZnSO4·7H2O to the fermentation medium of T. ethanolicus (JW200) was increased the ethanol ratio by ca. 39% and 23% for Thermoanaerobacter strain 65-2. Addition of 0.22 g l−1 ZnSO4·7H2O, increased the ethanol ratio by 80% for T. thermohydrosulfuricus (70-1). The highest ethanol ratio was obtained at the 20 g l−1 sucrose and 40 g l−1 molasses concentrations by all the bacteria studied and ethanol production ratio was not proportional to substrate concentration.T. ethanolicus (JW200) produced 5.04 g l−1 ethanol from sucrose (20 g l−1) and Thermoanaerobacter strain (65-2) produced 6.50 g l−1 ethanol from 40 g l−1 molasses in modified medium 2. T. ethanolicus (JW200) yielded (Yx/s) up to 0.47 of ethanol at 15 g l−1 sucrose concentration.

Keywords
Thermoanaerobacter strains; Ethanol production; Molasses; Metals
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Effect of zinc on ethanol production by two Thermoanaerobacter strains
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 4, April 2006, Pages 984–989
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