Composition and nutritive value of yeast biomass and yeast protein concentrates

• Published in: Journal of Nutritional Science and Vitaminology Vol. 43; no. 6; pp. 601 - 612
• Main Authors: Pacheco, M.T.B. (Universidade Federal de Goias, Goiania (Brasil)), Caballero-Cordoba, G.M, Sgarbieri, V.C
• Format: Journal Article
• Language: English
• Published: Tokyo Center for Academic Publications Japan 01-12-1997
• Subjects: Amino Acids - analysis; Animals; Biological and medical sciences; Biomass; CHEMICAL COMPOSITION; COMPOSICION QUIMICA; COMPOSITION CHIMIQUE; CONCENTRADOS DE PROTEINA; CONCENTRE DE PROTEINE; Dietary Proteins; Evaluation Studies as Topic; Fundamental and applied biological sciences. Psychology; Fungal Proteins - chemistry; Growth, nutrition, metabolism, transports, enzymes. Molecular biology; LEVADURA; LEVURE; Microbiology; Mycology; Nitrogen - chemistry; NUTRITIVE VALUE; protein concentrate; PROTEIN CONCENTRATES; Rats; Saccharomyces; VALEUR NUTRITIVE; VALOR NUTRITIVO; yeast composition; YEASTS; Yeast; Rat; Nutritive value; Rodentia; Biomass; Fungi; Vertebrata; Mammalia; Nitrogen balance; Casein; Production; Ascomycetes; Saccharomyces cerevisiae; Thallophyta
• ISSN: 0301-4800; 1881-7742
• DOI: 10.3177/jnsv.43.601

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 (UPUa) was the criteria of evaluation