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d- and l-lactic acid production from fresh sweet potato through simultaneous saccharification and fermentation

Paper ID Volume ID Publish Year Pages File Format Full-Text
3216 159 2013 7 PDF Available
Title
d- and l-lactic acid production from fresh sweet potato through simultaneous saccharification and fermentation
Abstract

•A method for l- and d-lactic acid production from fresh sweet potato.•The method produced l-lactic acid at 122.91–198.32 g L−1 with yields over 90% (w/w).•The method produced d-lactic acid at 122.49–186.40 g L−1 with yields of 90.11–84.92% (w/w).•This study would benefit the tuber and root-based lactic acid industries without alteration of plant equipment.

The aim of this study was to develop a bioprocess for l- and d-lactic acid production from raw sweet potato through simultaneous saccharification and fermentation by Lactobacillus paracasei and Lactobacillus coryniformis, respectively. The effects of enzyme and nitrogen source concentrations as well as of the ratio of raw material to medium were investigated. At dried material concentrations of 136.36–219.51 g L−1, yields of 90.13–91.17% (w/w) and productivities of 3.41–3.83 g L−1 h−1 were obtained with lactic acid concentrations as high as 198.32 g L−1 for l-lactic acid production. In addition, d-lactic acid was produced with yields of 90.11–84.92% (w/w) and productivities of 2.55–3.11 g L−1 h−1 with a maximum concentration of 186.40 g L−1 at the same concentrations of dried material. The simple and efficient process described in this study will benefit the tuber and root-based lactic acid industries without requiring alterations in plant equipment.

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Keywords
BE, beef extract; BYC, baker's yeast cell; CSL, corn steep liquor; PDLA, poly(d-lactide); Pep, peptone; PLA, polylactic acid; PLLA, poly(l-lactide); RL, red lentil; RS, reducing sugar; SHF, separate hydrolysis and fermentation; SSF, simultaneous saccharif
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d- and l-lactic acid production from fresh sweet potato through simultaneous saccharification and fermentation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 81, 15 December 2013, Pages 40–46
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