title: Composition and nutritive value of yeast biomass and yeast protein concentrates.
abstract: Yeast biomass (Saccharomyces sp.) produced in local breweries as a by-product was utilized in this study. Percent proximate composition, amino acid composition, and protein nutritive value were determined for the yeast cell biomass (YC), a sodium perchlorate extracted and isoelectrically precipitated protein concentrate (P-PC), and a sodium trimetaphosphate treated extract followed by isoelectrical precipitation (TMP-PC). Protein concentrates averaged 75% protein as compared to 48.5% in the yeast biomass. Precipitation of the protein in the presence of either sodium perchlorate or sodium trimetaphosphate was reduced to 71% and 51% of the cell RNA content, respectively. Protein nutritive value was 70% of casein when measured by the protein efficiency ratio (PER), and over 90% of casein when net protein utilization (NPUa) was the criteria of evaluation.
authors.affiliation: Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia, S.P., Brasil.
authors.forename: M T
authors.initials: MT
authors.lastname: Pacheco
authors.forename: G M
authors.initials: GM
authors.lastname: Caballero-Córdoba
authors.forename: V C
authors.initials: VC
authors.lastname: Sgarbieri
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D018533:Biomass; D004044:Dietary Proteins; D005069:Evaluation Studies as Topic; D005656:Fungal Proteins / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D051381:Rats; D012440:Saccharomyces
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins; D005656:Fungal Proteins; D009584:Nitrogen