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Titolo:
Microbial physiology, fermentation kinetics, and process engineering of heteropolysaccharide production by lactic acid bacteria
Autore:
Degeest, B; Vaningelgem, F; De Vuyst, L;
Indirizzi:
Free Univ Brussels, Res Grp Ind Microbiol Fermentat Technol & Downstr, IMDO, B-1050 Brussels, Belgium Free Univ Brussels Brussels Belgium B-1050 MDO, B-1050 Brussels, Belgium
Titolo Testata:
INTERNATIONAL DAIRY JOURNAL
fascicolo: 9, volume: 11, anno: 2001,
pagine: 747 - 757
SICI:
0958-6946(2001)11:9<747:MPFKAP>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
DELBRUECKII SSP BULGARICUS; EXOCELLULAR POLYSACCHARIDE PRODUCTION; CHEMICALLY-DEFINED MEDIUM; LACTOBACILLUS-HELVETICUS ATCC-15807; STREPTOCOCCUS-THERMOPHILUS LY03; EXOPOLYSACCHARIDE PRODUCTION; LACTOCOCCUS-LACTIS; EXTRACELLULAR POLYSACCHARIDE; SUBSP CREMORIS; POLYMER PRODUCTION;
Keywords:
exopolysaccharides; heteropolysaccharides; lactic acid bacteria;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
69
Recensione:
Indirizzi per estratti:
Indirizzo: De Vuyst, L Free Univ Brussels, Res Grp Ind Microbiol Fermentat Technol & Downstr, IMDO, Pleinlaan 2, B-1050 Brussels, Belgium Free Univ Brussels Pleinlaan 2 Brussels Belgium B-1050 elgium
Citazione:
B. Degeest et al., "Microbial physiology, fermentation kinetics, and process engineering of heteropolysaccharide production by lactic acid bacteria", INT DAIRY J, 11(9), 2001, pp. 747-757

Abstract

Many species of lactic acid bacteria (LAB) produce extracellular heterotype polysaccharides, the so-called hetero polysaccharides (HePS). Biosynthesis and secretion of the HePS from the LAB occur during different growth phases, and both the amount and type of the polymer is influenced by growth conditions. The total yield of exopolysaccharides produced by the LAB depends on the composition of the medium (carbon and nitrogen sources, growth factors, etc.) and the conditions in which the strains grow, i.e. temperature, pH, oxygen tension, and incubation time. It is never higher than 1.5g of polymer dry mass per litre of fermentation medium. Whereas mesophilic strains produce maximal amounts of HePS under conditions not optimal for growth, the HePS production from thermophilic LAB strains is growth-associated, i.e. maximum production during growth and under conditions optimal for growth. The HePS degradation often takes place upon prolonged incubation of the HePS-producing LAB strains due to glycohydrolase activity. Primary, secondary, and tertiary modelling unravel the functionality of the HePS-producing LAB strains in a food environment. Finally, appropriate process engineering canlead to an industrial breakthrough of the HePS production and applications: a high and stable high-molecular-mass HePS production by appropriate feeding strategies through fed-batch cultivation on the one hand, and the application of a two-step fermentation process in yoghurt manufacture on the other hand. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:50:07