fulltext.study @t Gmail

Lactic acid and biosurfactants production from hydrolyzed distilled grape marc

Paper ID Volume ID Publish Year Pages File Format Full-Text
35887 45112 2007 11 PDF Available
Title
Lactic acid and biosurfactants production from hydrolyzed distilled grape marc
Abstract

Acid hydrolysis of distilled grape marc, an useless agricultural residue from wineries, was carried out using dilute sulfuric acid (1–5%) at several reaction times and 130 °C, in order to obtain monomeric sugars which after supplementation with corn steep liquor (10 g/L) and yeast extract (10 g/L) were used to carry out the fermentation into lactic acid by Lactobacillus pentosus without detoxification stage. Xylose was the main sugar generated followed by glucose and arabinose. Possible inhibitor compounds such as acetic acid liberated from acetyl groups, and furfural and hydroxymethylfurfural generated by sugars dehydration, were produced as degradation byproducts. The hydrolysis stage was optimized by using an incomplete factorial design where the independent variables were the percentage of catalyzer, the reaction time and the temperature. The optima conditions in terms of xylose concentration were 3.3% H2SO4, 125 min and 130 °C, but due to the high furfural concentration, two other conditions using lower reaction times (30 and 77.5 min) were also selected to assay the fermentation. Although any condition was feasible to fully utilize the relatively broad spectra of sugars released by the acid hydrolysis, under the shorter reaction time the best results were achieved (QP = 0.476 g/L h; YP/S = 0.71 g/g) which represents a theoretical yield of 97%. Furthermore, L. pentosus produced 4.8 mg/L of intracellular biosurfactants, measured as biosurfactin, representing a yield of 0.60 mg of intracellular biosurfactant per g of sugars consumed.

Keywords
Distilled grape marc; Hydrolyzates; Actobacillus pentosus; Lactic acid; Biosurfactants
First Page Preview
Lactic acid and biosurfactants production from hydrolyzed distilled grape marc
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 6, June 2007, Pages 1010–1020
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