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A straightforward logistic method for feeding a fed-batch baker's yeast culture

Paper ID Volume ID Publish Year Pages File Format Full-Text
3658 181 2012 8 PDF Available
Title
A straightforward logistic method for feeding a fed-batch baker's yeast culture
Abstract

The aim of this work was to find a straightforward, low-cost method for nutrient medium delivery during fed-batch cultivation of baker's yeast; a method that provides a high specific growth rate, a high biomass yield, and a high dough-leavening ability. The time profile for the inflow of the nutrient medium, g(t), is a logistic model which takes the form of g(t) = a/(1 + be−ct), with a, b and c standing for its parameters. The initial values of a, b and c were calculated considering the results of a baker's yeast process where dissolved oxygen tension was used as a control parameter of medium inflow. A method was developed for modifying the parameters of the initial model so as to obtain a formula that would cause the inflow of the nutrient medium to maximize the criterion K(K = Yμ), where Y stands for yeast biomass yield and μ denotes specific growth rate. The parameters of the modified model depended on initial biomass concentration. The relation was described by a logarithmic function and incorporated into the control algorithm. This algorithm produced a biomass yield exceeding 0.55 g g−1 and a high dough-leavening ability. The method proposed is recommendable for small and medium-sized firms producing baker's yeast.

Keywords
Baker's yeast cultivation; Dough leavening ability; Control algorithm; Fed-batch culture; Logistic model; Method for nutrient delivery
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A straightforward logistic method for feeding a fed-batch baker's yeast culture
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 60, 15 January 2012, Pages 36–43
Authors
, , , , ,
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