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Modelling of batch kefir fermentation kinetics for ethanol production by mixed natural microflora

Paper ID Volume ID Publish Year Pages File Format Full-Text
19264 43055 2010 6 PDF Available
Title
Modelling of batch kefir fermentation kinetics for ethanol production by mixed natural microflora
Abstract

Non-structured kinetic models are proposed for the mathematical description of principal kinetics involved in ethanol production during kefir fermentation in a batch reactor system. Experimental data collected from a series of batch fermentations, which were performed at constant temperature (ϑ = 21 °C) and initial kefir grains mass concentration (γKG,0 = 42 g L−1) over different fermentation periods in the interval from (0–89) h, were used to estimate parameters and also to validate the proposed models. The optimal values of the kinetic parameters were approximated by minimizing the discrepancy between the model predictions and corresponding experimental data. The growth of kefir grains could be expressed by a logistic function model, which describes the growth as a function of initial kefir grains concentration, time, specific growth rate, and final kefir grains concentration. The modified Gompertz model, which gives the lag time, the specific production rate and the maximum ethanol mass concentration, was able to describe the formation of ethanol as the fermentation proceeded. In both cases, the model simulation matches well with the experimental observations, which made it possible to elucidate the fermentation characteristics of kefir grains during efficient ethanol production. These models thus can be employed for the development and optimization of bio-based ethanol production processes.

Keywords
Batch fermentation; Kefir grains; Ethanol production; Kinetic model
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Modelling of batch kefir fermentation kinetics for ethanol production by mixed natural microflora
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 88, Issue 1, March 2010, Pages 55–60
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