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

Author(s)

Favaro, Camila P. ^{[1, 2]} ; Baraldi, Ilton J. ^[3] ; Casciatori, Fernanda P. ^[1] ; Farinas, Cristiane S. ^{[1, 2]}

Affiliation

^[1] Univ Fed Sao Carlos, Grad Program Chem Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentat, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Tecnol Fed Parana, Dept Food Engn, BR-85884000 Medianeira, PR - Brazil

• Document type: Journal article
• Source: BIOMOLECULES; v. 10, n. 2 FEB 2020.
• Web of Science Citations: 0

Abstract

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 beta-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 degrees 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 beta-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. (AU)

• FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
• Grantee: Roberto de Campos Giordano
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
• FAPESP's process: 18/00996-2 - Development of a pseudo-continuous packed-bed bioreactor for solid-state fermentation
• Grantee: Fernanda Perpétua Casciatori
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants