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Utilization of cheese whey powder (CWP) for ethanol fermentations: Effects of operating parameters

Paper ID Volume ID Publish Year Pages File Format Full-Text
18629 42728 2006 8 PDF Available
Title
Utilization of cheese whey powder (CWP) for ethanol fermentations: Effects of operating parameters
Abstract

Cheese whey powder (CWP) solution was used for ethanol fermentation by Kluyveromyces marxianus NRRL-1195 in batch experiments. Effects of initial pH, CWP concentration and external nutrient (N, P) supplementation on ethanol formation rate and extent were investigated. The initial pH was varied between 3 and 7. The most suitable initial pH maximizing the final ethanol yield was found to be 5. Nutritional requirements of the organisms were investigated by supplementing the CWP solution with external nitrogen and phosphate sources. The rate and extent of ethanol formation did not increase with external nutrient addition indicating the fact that the nitrogen and phosphorous content of CWP was sufficient for ethanol fermentation. CWP concentration was varied between 50 and 300 g l−1 with total sugar concentrations between 25 and 150 g l−1. Final ethanol concentration and the rate of ethanol formation increased with increasing CWP concentration indicating no substrate or product inhibitions, but substrate limitations. The yield coefficient of ethanol varied between 0.35 and 0.54 g ethanol g sugar−1 and reached the theoretical level (0.54 g EtOH g sugar−1) at 300 g l−1 CWP concentration.

Keywords
Cheese whey powder (CWP); Ethanol fermentation; Kluyveromyces marxianus
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Utilization of cheese whey powder (CWP) for ethanol fermentations: Effects of operating parameters
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 38, Issue 5, 2 March 2006, Pages 711–718
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