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Open AccessArticle

β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing

1
Embrapa Instrumentation, Rua XV de Novembro 1452, São Carlos, SP 13560-970, Brazil
2
Graduate Program in Chemical Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
3
Department of Food Engineering, Federal University of Technology of Paraná, Medianeira, PR 85884-000, Brazil
*
Author to whom correspondence should be addressed.
Biomolecules 2020, 10(2), 227; https://doi.org/10.3390/biom10020227
Received: 2 January 2020 / Revised: 29 January 2020 / Accepted: 30 January 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Function of Microorganism in Food Production)
Soluble coffee offers the combined benefits of high added value and practicality for its consumers. The hydrolysis of coffee polysaccharides by the biochemical route, using enzymes, is an eco-friendly and sustainable way to improve the quality of this product, while contributing to the implementation of industrial processes that have lower energy requirements and can reduce environmental impacts. This work describes the production of hydrolytic enzymes by solid-state fermentation (SSF), cultivating filamentous fungi on waste from the coffee industry, followed by their application in the hydrolysis of waste coffee polysaccharides from soluble coffee processing. Different substrate compositions were studied, an ideal microorganism was selected, and the fermentation conditions were optimized. Cultivations for enzymes production were carried out in flasks and in a packed-bed bioreactor. Higher enzyme yield was achieved in the bioreactor, due to better aeration of the substrate. The best β-mannanase production results were found for a substrate composed of a mixture of coffee waste and wheat bran (1:1 w/w), using Aspergillus niger F12. The enzymatic extract proved to be very stable for 24 h, at 50 °C, and was able to hydrolyze a considerable amount of the carbohydrates in the coffee. The addition of a commercial cellulase cocktail to the crude extract increased the hydrolysis yield by 56%. The production of β-mannanase by SSF and its application in the hydrolysis of coffee polysaccharides showed promise for improving soluble coffee processing, offering an attractive way to assist in closing the loops in the coffee industry and creating a circular economy.
Keywords: bioprocess engineering, coffee carbohydrates, enzymatic hydrolysis, agro-industrial residues, solid-state fermentation (SSF), column bioreactor. bioprocess engineering, coffee carbohydrates, enzymatic hydrolysis, agro-industrial residues, solid-state fermentation (SSF), column bioreactor.
MDPI and ACS Style

Favaro, C.P.; Baraldi, I.J.; Casciatori, F.P.; Farinas, C.S. β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing. Biomolecules 2020, 10, 227.

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