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Titolo:
Catabolism of amino acids by lactic acid bacteria isolated from Cheddar cheese
Autore:
Williams, AG; Noble, J; Banks, JM;
Indirizzi:
Hannah Res Inst, Ayr KA6 5HL, Scotland Hannah Res Inst Ayr Scotland KA6 5HL nah Res Inst, Ayr KA6 5HL, Scotland
Titolo Testata:
INTERNATIONAL DAIRY JOURNAL
fascicolo: 4-7, volume: 11, anno: 2001,
pagine: 203 - 215
SICI:
0958-6946(2001)11:4-7<203:COAABL>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRANCHED-CHAIN AMINOTRANSFERASE; CYSTATHIONINE GAMMA-LYASE; FLAVOR COMPOUND FORMATION; LACTOCOCCUS-LACTIS; AROMA COMPOUNDS; NONSTARTER LACTOBACILLI; CARBONYL-COMPOUNDS; CREMORIS SK11; BETA-LYASE; CONVERSION;
Keywords:
amino acid catabolism; lactic acid bacteria; cheddar cheese; NSLAB; flavour;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Williams, AG Hannah Res Inst, Ayr KA6 5HL, Scotland Hannah Res Inst Ayr Scotland KA6 5HL Ayr KA6 5HL, Scotland
Citazione:
A.G. Williams et al., "Catabolism of amino acids by lactic acid bacteria isolated from Cheddar cheese", INT DAIRY J, 11(4-7), 2001, pp. 203-215

Abstract

Fifty five percent of 152 lactic acid bacteria (LAB) isolated from 9 mature Cheddar cheeses were able to catabolise, protein hydrolysates and individual amino acids in the Biolog MT1(TM) microplate assay. A more detailed study of 31 isolates confirmed a requirement for a-ketoglutaric acid and inter- and intra-species differences in the range and number of amino acids utilised. GCMS analysis of cell-free supernatants of 29 LAB isolates grown on alow-carbohydrate medium containing lactalbumin hydrolysate identified morethan 90 compounds, Putative metabolites of valine, leucine, isoleucine. phenylalanine and sulphur-containing amino acids were detected although the metabolite profiles were isolate-specific. The occurrence and activity of amino acid converting enzymes was also monitored in the LAB isolates. Methionine, branched-chain and aromatic amino acid aminotransferase activities were detected with alpha -ketoglutarate as acceptor. There was no conclusive evidence for a widespread occurrence of deaminase, decarboxylase and demethiolase activities. The majority of isolates examined formed thiols from methionine via an aminotransferase-mediated reaction. (C) 2001 Elsevier ScienceLtd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 08:07:20