Bioprocess development with special yeasts for cassava bagasse enrichment nutritional to use in animal feed

Author(s)

Shinya, Thais Yumi ; Pereira Elsner, Victor Henrique ; de Lima Junior, David Spressao ; de Barros Ranke, Fabiane Fernanda ; Escaramboni, Bruna ; da Paixao Melo, Weilan Gomes ; Fernandez Nunez, Eutimio Gustavo ; Neto, Pedro de Oliva

• Document type: Journal article
• Source: ANIMAL FEED SCIENCE AND TECHNOLOGY; v. 290, p. 17-pg., 2022-06-04.

Abstract

In general, the low-protein agm-industrial residues like cassava bagasse are cheaper but limited in feed use. However, if through an economically attractive bioprocess, these residues are transformed into nutritionally enriched products, the animal protein manufacturing cost afford to be diminished. This work aimed to establish an original biological treatment based on special yeasts for cassava bagasse enriching. Batch and Fed-Batch cultures, with raw (CB) or hydrolyzed cassava bagasse (HCB) and corn steep liquor (CSL), were used to screen promising yeasts for valorizing cassava residue. Among the four assessed yeasts (Rhodotorula sp. LABI1, Wickerhamomyces onychis LABI2, Sporidiobolus pararoseus Sia 33.1, Sporobolomyces japonicus Sia 70a), the cultures of S. japonicus Sia 70a produced more biomass when the culture medium comprised 0.5 % CSL and 5.0 % CB (8.6 g/L yeast biomass, biomass-substrate yield factor; Y-x/s = 0.23g/g, and maximum specific growth rate; mu(max) = 0.03 h(-1)). However, S. pararoseus Sia 33.1 (11.6 %), W. onychis LABI2 (8-15 %) and S. japonicus Sia 70a (11.8 %) were responsible for higher protein content in the CB due to the yeast biomass incorporated at the end of the process. Amylases were also detected in some cultures (up to 0.4 U/mL), which could improve the cassava bagasse digestibility. These results showed bioprocessing potential by these special yeasts to convert the low-protein cassava bagasse into a nutritionally enriched product. Now a biological evaluation with animals is needed to approve this method for feed purposes. (AU)

• FAPESP's process: 14/24188-1 - Development of bioprocesses for obtention of products with potential applications in bioenergy and feed industries using agro-industrial residues
• Grantee: Pedro de Oliva Neto
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants