title: Utilization of brewer's yeast cells for the production of food-grade yeast extract. Part 1: Effects of different enzymatic treatments on solid and protein recovery and flavor characteristics.
abstract: Yeast extract was produced from brewer's yeast of a beer factory by combined enzymatic treatments using endoprotease, exoprotease, 5'-phosphodiesterase, and adenosine monophosphate (AMP)-deaminase. Effects of enzyme combination, enzyme dosages and treatment sequence on the recovery of solid and protein, flavor and compositional characteristics were investigated. Exoprotease dosage strongly affected the recovery of protein and degree of hydrolysis (DH) and sensory characteristics. When the yeast cells were treated using optimal combination of endoprotease and exoprotease (0.6% Protamex and 0.6% Flavourzyme), high solid recovery (48.3-53.1%) and the best flavor profile were obtained. Among various treatment sequences using multiple enzymes, treatment with protease followed by nuclease resulted in the highest 5'-guanosine monophosphate (5'-GMP) content. The optimal concentrations of both 5'-phosphodiesterase and AMP-deaminase were found to be 0.03%. After treatments using optimal combination of enzyme, enzyme dosages and treatment sequence for four enzymes, a high solid yield of 55.1% and 5'-nucleotides content of 3.67% were obtained.
authors.affiliation: Department of Food Technology, Hoseo University, Asan 336-795, South Korea. hjchae@bigfoot.com
authors.forename: H J
authors.initials: HJ
authors.lastname: Chae
authors.forename: H
authors.initials: H
authors.lastname: Joo
authors.forename: M J
authors.initials: MJ
authors.lastname: In
mesh_terms: D000659:AMP Deaminase / Q000378:metabolism; D000596:Amino Acids / Q000032:analysis / Q000378:metabolism; D001515:Beer; D019587:Dietary Supplements / Q000382:microbiology; D010450:Endopeptidases / Q000378:metabolism; D020689:Exopeptidases / Q000378:metabolism; D005421:Flavoring Agents / Q000737:chemistry / Q000378:metabolism; D005525:Food-Processing Industry / Q000379:methods; D005656:Fungal Proteins / Q000032:analysis / Q000378:metabolism; D007700:Kinetics; D008970:Molecular Weight; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000166:cytology / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D005421:Flavoring Agents; D005656:Fungal Proteins; D010727:Phosphoric Diester Hydrolases; D010450:Endopeptidases; D020689:Exopeptidases; C412470:flavourzyme; D000659:AMP Deaminase