Valorization of Brewer's Spent Grain Using Biological Treatments and its Application in Feeds for European Seabass (Dicentrarchus labrax)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F22%3A43921532" target="_blank" >RIV/62156489:43210/22:43921532 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3389/fbioe.2022.732948" target="_blank" >https://doi.org/10.3389/fbioe.2022.732948</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3389/fbioe.2022.732948" target="_blank" >10.3389/fbioe.2022.732948</a>

Result language

angličtina

Original language name

Valorization of Brewer's Spent Grain Using Biological Treatments and its Application in Feeds for European Seabass (Dicentrarchus labrax)

Original language description

Brewer&apos;s spent grain (BSG) is the main brewery industry by-product, with potential applications in the feed and food industries due to its carbohydrate composition. In addition, the lignocellulosic nature of BSG makes it an adequate substrate for carbohydrases production. In this work, solid-state fermentation (SSF) of BSG was performed with Aspergillus ibericus, a non-mycotoxin producer fungus with a high capacity to hydrolyze the lignocellulosic matrix of the agro-industrial by-products. SSF was performed at different scales to produce a crude extract rich in cellulase and xylanase. The potential of the crude extract was tested in two different applications: -(1) - the enzymatic hydrolysis of the fermented BSG and (2) - as a supplement in aquafeeds. SSF of BSG increased the protein content from 25% to 29% (w/w), while the fiber content was reduced to 43%, and cellulose and hemicellulose contents were markedly reduced to around 15%. The scale-up of SSF from 10 g of dry BSG in flasks to 50 g or 400 g in tray-type bioreactors increased 55% and 25% production of cellulase and xylanase, up to 323 and 1073 U g(-1) BSG, respectively. The optimum temperature and pH of maximal activities were found to be 55 degrees C and pH 4.4 for xylanase and 50 degrees C and pH 3.9 for cellulase, cellulase being more thermostable than xylanase when exposed at temperatures from 45 degrees C to 60 degrees C. A Box-Behnken factorial design was applied to optimize the hydrolysis of the fermented BSG by crude extract. The crude extract load was a significant factor in sugars release, highlighting the role of hydrolytic enzymes, while the load of fermented BSG, and addition of a commercial beta-glucosidase were responsible for the highest phenolic compounds and antioxidant activity release. The lyophilized crude extract (12,400 and 1050 U g(-1) lyophilized extract of xylanase and cellulase, respectively) was also tested as an enzyme supplement in aquafeed for European seabass (Dicentrarchus labrax) juveniles. The dietary supplementation with the crude extract significantly improved feed and protein utilization. The processing of BSG using biological treatments, such as SSF with A. ibericus, led to the production of a nutritionally enriched BSG and a crude extract with highly efficient carbohydrases capable of hydrolyzing lignocellulosic substrates, such as BSG, and with the potential to be used as feed enzymes with remarkable results in improving feed utilization of an important aquaculture fish species.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20801 - Environmental biotechnology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Frontiers in Bioengineering and Biotechnology

ISSN

2296-4185

e-ISSN

2296-4185

Volume of the periodical

10

Issue of the periodical within the volume

3 May

Country of publishing house

CH - SWITZERLAND

Number of pages

15

Pages from-to

732948

UT code for WoS article

000796964100001

EID of the result in the Scopus database

2-s2.0-85130409435