title: Reduction of soybean meal non-starch polysaccharides and α-galactosides by solid-state fermentation using cellulolytic bacteria obtained from different environments.
abstract: Soybean meal (SBM) is an important protein source in animal feed. However, the levels of SBM inclusion are restricted in some animal species by the presence of antinutritional factors (ANFs), including non-starch polysaccharides (NSPs) and α-galactosides (GOSs). The aim of this study was to reduce the soybean meal NSPs and GOSs by solid-state fermentation (SSF) using a combination of cellulolytic bacteria isolated from different environments (termites, earthworms, corn silage and bovine ruminal content). To analyse the key enzymatic activities, the isolates were grown in minimal media containing NSPs extracted from SBM. The selected bacterial strains belonged to the genera Streptomyces, Cohnella and Cellulosimicrobium. SSF resulted in a reduction of nearly 24% in the total NSPs, 83% of stachyose and 69% of raffinose and an increase in the protein content. These results suggest that cellulolytic bacteria-based SSF processing facilitates SBM nutritional improvement. In addition, the use of fermented SBM in animal diets can be recommended.
authors.affiliation: Laboratorio de Biotecnología, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile.
authors.forename: Rafael
authors.initials: R
authors.lastname: Opazo
authors.forename: Felipe
authors.initials: F
authors.lastname: Ortúzar
authors.forename: Paola
authors.initials: P
authors.lastname: Navarrete
authors.forename: Romilio
authors.initials: R
authors.lastname: Espejo
authors.forename: Jaime
authors.initials: J
authors.lastname: Romero
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D002480:Cellulase / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D017931:DNA Primers / Q000737:chemistry; D005285:Fermentation; D005697:Galactosides / Q000737:chemistry; D009844:Oligosaccharides / Q000737:chemistry; D012150:Polymorphism, Restriction Fragment Length; D011135:Polysaccharides, Bacterial / Q000378:metabolism; D012335:RNA, Ribosomal / Q000737:chemistry; D012336:RNA, Ribosomal, 16S / Q000378:metabolism; D011887:Raffinose / Q000737:chemistry; D012417:Rumen / Q000378:metabolism; D013025:Glycine max / Q000378:metabolism*; D013213:Starch / Q000737:chemistry; D013302:Streptomyces / Q000378:metabolism
chemical_list: D017931:DNA Primers; D005697:Galactosides; D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S; C005695:stachyose; D002482:Cellulose; D013213:Starch; D002480:Cellulase; D011887:Raffinose