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Metabolic acclimatization: preparing active dry yeast for fuel ethanol production

Paper ID Volume ID Publish Year Pages File Format Full-Text
36704 45142 2005 9 PDF Available
Title
Metabolic acclimatization: preparing active dry yeast for fuel ethanol production
Abstract

“Propagation” or “conditioning” of active dry yeast (ADY) for the production of fuel ethanol is thought to reduce lag times in fermentation and reduce overall fermentation times. The objectives of this study were to determine the optimal time that ADY should be conditioned prior to fermentation and to determine how well yeast and bacterial contaminants present in ADY are propagated. A new term, metabolic acclimatization (MAcc), was introduced to describe events occurring during conditioning. It was observed that MAcc is not necessary prior to alcoholic fermentation. Lag times were reduced but overall fermentation times were unaffected. In fact, fermentation rates were slower than control conditions where ADY was directly inoculated into fermentors. In addition, if MAcc systems were to be used, it is recommended that only batch MAcc systems be practiced. Continuous MAcc (continuous yeast propagation) leads to increased bacterial numbers and organic acid levels, which become stressful to yeast.

Keywords
Active dry yeast; Propagation; Conditioning; Metabolic acclimatization; MAcc; Lag time; Fermentation rates; Fermentation time; Contaminants
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Metabolic acclimatization: preparing active dry yeast for fuel ethanol production
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 6, May 2005, Pages 2205–2213
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