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Physiological and morphological study of encapsulated Saccharomyces cerevisiae

Paper ID Volume ID Publish Year Pages File Format Full-Text
18073 42711 2007 6 PDF Available
Title
Physiological and morphological study of encapsulated Saccharomyces cerevisiae
Abstract

The impact of encapsulation on the anaerobic growth pattern of S. cerevisiae CBS 8066 in a defined synthetic medium over 20 consecutive batch cultivations was investigated. In this period, the ethanol yield increased from 0.43 to 0.46 g/g, while the biomass and glycerol yields decreased by 58 and 23%, respectively. The growth rate of the encapsulated cells in the first batch was 0.13 h−1, but decreased gradually to 0.01 h−1 within the 20 sequential batch cultivations. Total RNA content of these yeast cells decreased by 39% from 90.3 to 55 mg/g, while the total protein content decreased by 24% from 460 to 350 mg/g. On the other hand, the stored carbohydrates, that is, glycogen and trehalose content, increased by factors of 4.5 and 4 within 20 batch cultivations, respectively. Higher biomass concentrations inside capsules led to a lower glucose diffusion rate through the membrane, and volumetric mass transfer coefficient for glucose was drastically decreased from 6.28 to 1.24 (cm3/min) by continuing the experiments. Most of the encapsulated yeast existed in the form of single and non-budding cells after long-term application.

Keywords
Encapsulation; Yeast physiology; Ethanol; Glycogen; Proteins; Mass transfer coefficient
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 41, Issues 6–7, 1 November 2007, Pages 683–688
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