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Study of the effects of temperature and pH on lactic acid production from fresh cassava roots in tofu liquid waste by Streptococcus bovis

Paper ID Volume ID Publish Year Pages File Format Full-Text
4473 227 2008 9 PDF Available
Title
Study of the effects of temperature and pH on lactic acid production from fresh cassava roots in tofu liquid waste by Streptococcus bovis
Abstract

We report a study of the effects of temperature and pH on the kinetics of lactic acid production from fresh cassava roots (FCR) by Streptococcus bovis in new media: tofu liquid waste (TLW); TLW with 2 wt% concentrated maguro waste (TLW + CMW2); and in a standard trypto-soya broth (TSB) compared with a standard medium (glucose in TSB). The results showed that 39 °C and pH 5.5 were optimal for fermentation properties (lactic acid concentration, productivity and specific growth rate) in all media, including the standard. The energy of activation (Ea) and the energy of deactivation (Ed) of lactic acid fermentation in all media were calculated using the Arrhenius relation. The Ea and Ed values increased in the order FCR in TLW < FCR in TLW + CMW2 < glucose in TSB < FCR in TSB, while values of productivity and specific growth rate decreased in the same order. The effects of pH on productivity and specific growth rate were evaluated by Michaelis–Menten and Monod-type equations. For pH, the inhibition is competitive for both productivity and specific growth rate. By controlling the pH at 5.80, the inhibition for both productivity and specific growth rate were minimized in all media.

Keywords
Kinetics; Lactic acid; Fresh cassava roots; Streptococcus bovis; Activation energy; Inhibition models
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Study of the effects of temperature and pH on lactic acid production from fresh cassava roots in tofu liquid waste by Streptococcus bovis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 40, Issue 1, 15 May 2008, Pages 175–183
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