title: Effect of particle size and ammonium sulfate concentration on rice bran fermentation with the fungus Rhizopus oryzae.
abstract: The effects of rice bran particle size (0.18-0.39mm) and ammonium sulfate concentration in the nutrient solution (2-8g/L) on biomass production, protein and phenolic content generated by solid state fermentation with the fungus Rhizopus oryzae (CCT 1217) were studied. Particle size had a positive effect on biomass production and a negative effect (p⩽0.05) on protein and phenolic contents. Ammonium sulfate concentration had a positive effect (p⩽0.05) on biomass and phenolic content gain. Cultivation of fungus in rice bran with particle size of 0.18mm and in the presence of 8g/L ammonium sulfate, resulted in protein levels of 20g/100g dry wt and phenolics content of 4mg/g dry wt. These values were 53 and 65% higher than those achieved with unfermented rice bran. The results demonstrate that the fermentation process increased the value of compounds recovered for potential use in food formulations.
authors.affiliation: Escola de Química e Alimentos, Universidade Federal do Rio Grande, Rua Engenheiro Alfredo Huck, 475, Rio Grande-RS 96201-460, Brazil. eng_ea@hotmail.com
authors.forename: Cristiano Gautério
authors.initials: CG
authors.lastname: Schmidt
authors.forename: Eliana Badiale
authors.initials: EB
authors.lastname: Furlong
mesh_terms: D000645:Ammonium Sulfate / Q000737:chemistry* / Q000494:pharmacology*; D018533:Biomass; D005285:Fermentation / Q000187:drug effects*; D005944:Glucosamine / Q000032:analysis; D012275:Oryza / Q000187:drug effects / Q000378:metabolism*; D010316:Particle Size; D010636:Phenols / Q000032:analysis; D010940:Plant Proteins / Q000032:analysis; D012233:Rhizopus / Q000187:drug effects* / Q000378:metabolism*; D014866:Waste Products / Q000032:analysis
chemical_list: D010636:Phenols; D010940:Plant Proteins; D014866:Waste Products; D005944:Glucosamine; D000645:Ammonium Sulfate