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Sequential bioprocessing of Ulva rigida to produce lignocellulolytic enzymes and to improve its nutritional value as aquaculture feed

Author:
Fernandes, Helena, Salgado, José Manuel, Martins, Nicole, Peres, Helena, Oliva-Teles, Aires, Belo, Isabel
Source:
Bioresource technology 2019 v.281 pp. 277-285
ISSN:
0960-8524
Subject:
Aspergillus, Ulva rigida, antioxidant activity, aquaculture feeds, aquaculture industry, beta-glucosidase, bioprocessing, endo-1,4-beta-glucanase, enzymatic hydrolysis, glucans, lignocellulases, macroalgae, nutritive value, solid state fermentation, xylanases
Abstract:
The macroalgae aquaculture industry has grown up in the last years, and new applications for macroalgae should be considered. In this work, sequential biological treatments as solid-state fermentation (SSF) by Aspergillus ibericus and enzymatic hydrolysis (EH) were applied to washed and unwashed Ulva rigida. SSF of unwashed macroalgae showed higher xylanase (359.8 U/g), cellulase (73.07 U/g) and β-glucosidase (14.9 U/g) activities per dry mass of macroalgae. After SSF, two strategies to carry out EH were assayed. The best process was SSF followed by EH by simply adding a buffer. The non-starch polysaccharides content was reduced by 93.2%, achieving a glucan conversion of 98%. In addition, the antioxidant activity was improved 2.8-fold and the protein concentration of macroalgae extracts increased from 16.9% to 29.8% (w/w). These biological treatments allowed to increase macroalgae value as feedstuff with potential for use in aquafeeds.
Agid:
6340923