NDLI: Yeast Biomass Production in Brewery’s Spent Grains Hemicellulosic Hydrolyzate

Content Provider	Springer Nature Link
Author	Duarte, Luís C. Carvalheiro, Florbela Lopes, Sónia Neves, Inês Gírio, Francisco M.
Copyright Year	2007
Abstract	Yeast single-cell protein and yeast extract, in particular, are two products which have many feed, food, pharmaceutical, and biotechnological applications. However, many of these applications are limited by their market price. Specifically, the yeast extract requirements for culture media are one of the major technical hurdles to be overcome for the development of low-cost fermentation routes for several top value chemicals in a biorefinery framework. A potential biotechnical solution is the production of yeast biomass from the hemicellulosic fraction stream. The growth of three pentose-assimilating yeast cell factories, Debaryomyces hansenii, Kluyveromyces marxianus, and Pichia stipitis was compared using non-detoxified brewery’s spent grains hemicellulosic hydrolyzate supplemented with mineral nutrients. The yeasts exhibited different specific growth rates, biomass productivities, and yields being D. hansenii as the yeast species that presented the best performance, assimilating all sugars and noteworthy consuming most of the hydrolyzate inhibitors. Under optimized conditions, D. hansenii displayed a maximum specific growth rate, biomass yield, and productivity of 0.34 h$^{−1}$, 0.61 g g$^{−1}$, and 0.56 g l$^{−1}$ h$^{−1}$, respectively. The nutritional profile of D. hansenii was thoroughly evaluated, and it compares favorably to others reported in literature. It contains considerable amounts of some essential amino acids and a high ratio of unsaturated over saturated fatty acids.
Starting Page	119
Ending Page	129
Page Count	11
File Format	PDF
ISSN	02732289
Journal	Applied Biochemistry and Biotechnology
Volume Number	148
Issue Number	1-3
e-ISSN	15590291
Language	English
Publisher	Humana Press Inc
Publisher Date	2007-09-26
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Debaryomyces hansenii Biomass Single-cell protein Hemicellulosic hydrolyzate Brewery’s spent grains Agro-industrial residues upgrading Yeast extract Biochemistry Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology

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