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Impacts of yeast floc size distributions on their observed rates for substrate uptake and product formation

Paper ID Volume ID Publish Year Pages File Format Full-Text
18323 42718 2006 7 PDF Available
Title
Impacts of yeast floc size distributions on their observed rates for substrate uptake and product formation
Abstract

The focused beam reflectance measurement (FBRM) probe was directly inserted into a small fermentor with a working volume of 650 mL and the on-line monitoring technique for the size distribution of SPSC01, a self-flocculating yeast strain, was established. It was found that the floc size distribution could be characterized by its mode, M, which was further correlated by a power function with the stirring speed, r. Therefore, the designated floc size distributions were obtained through controlling the stirring speed. The batch fermentation times were significantly extended when the same levels of ethanol and biomass concentrations were reached, but the floc size distributions characterized by M increased from 100 to 600 μm. These experimental results indicated that the intra-particle mass transfer limitation existed for such a self-flocculating yeast ethanol fermentation system and the kinetics ought to be categorized into two different levels: intrinsic and observed. The impacts of the floc size distributions on the observed rates for glucose uptake and ethanol production were quantitatively investigated by manipulating the stirring speed so that the designated floc size distributions were achieved. The effectiveness factors, ηS and ηP for glucose uptake and ethanol production, respectively, were further evaluated. It was found that both the floc size distribution and the level of limiting substrate concentration affected ηS and ηP.

Keywords
FBRM; Floc; On-line monitoring; Observed rates; Glucose uptake; Ethanol production; Effectiveness factor
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Impacts of yeast floc size distributions on their observed rates for substrate uptake and product formation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 39, Issue 2, 26 June 2006, Pages 289–295
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
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Full-text PDF Download
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