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Production of fermentable media from vine‐trimming wastes and bioconversion into lactic acid by Lactobacillus pentosus
Author(s) -
Bustos Guadalupe,
Moldes Ana Belén,
Cruz José Manuel,
Domínguez José Manuel
Publication year - 2004
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.1922
Subject(s) - xylose , bioconversion , chemistry , lactic acid , furfural , fermentation , food science , acetic acid , hydrolysate , lactic acid fermentation , hydrolysis , lactobacillus sakei , pediococcus acidilactici , hemicellulose , sugar , lactobacillus , biochemistry , bacteria , biology , lactobacillus plantarum , genetics , catalysis
Trimmings of vineshoots, an agricultural waste with little use, were hydrolysed with dilute sulphuric acid (1–5%) in order to obtain sugar solutions suitable as fermentation media. The operational conditions for hydrolysis were selected on the basis of both the generation of hemicellulosic sugars (mainly xylose) and glucose and the concentrations of reaction byproducts affecting fermentation (furfural, hydroxymethylfurfural and acetic acid). Hemicellulosic hydrolysates were supplemented with nutrients and fermented with Lactobacillus pentosus , without any previous detoxification stage, to produce lactic acid. Under the best operational conditions assayed (3% H 2 SO 4 and 15 min), 21.8 g lactic acid l −1 was produced ( Q P = 0.844 g l −1 h −1 , Y P/S = 0.77 g g −1 ), which represents a theoretical yield of 99.6%. Acetic acid was the primary byproduct formed from xylose, at about 25% of the lactic acid level. Copyright © 2004 Society of Chemical Industry