Growth parameters influencing the production of Lactobacillus rhamnosus bacteriocins ST461BZ and ST462BZ
Date
2005
Authors
Todorov S.D.
Dicks L.M.T.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Bacteriocins ST461BZ (2.8 kDa) and ST462BZ (8.0 kDa), produced by two strains of Lactobacillus rhamnosus isolated from boza, a beverage produced from different cereals by yeast and lactic acid bacteria, inhibits the growth of Lactobacillus casei, Enterococcus faecalis, Escherichia coli and Pseudomonas aeruginosa. Maximum bacteriocin activity (12 800 AU/ml) was recorded after 15 h in MRS broth. No increase in the production of the two bacteriocins was recorded in MRS broth supplemented with tryptone (20 g/l), D-glucose (20 g/l) and sucrose (20 g/l). Glycerol at 1 g/l and higher inhibited the production of both bacteriocins. Bacteriocin ST461BZ production increased to 25 600 AU/ml in MRS broth supplemented with 20 g/l or 50 g/l K2HPO4. Bacteriocin ST462BZ activity increased to 51 200 AU/ml in MRS broth supplemented with 20 g/l to 100 g/l KH2PO4.
Description
Keywords
Bacteria (microorganisms), Enterococcus faecalis, Escherichia coli, Lactobacillus casei, Lactobacillus rhamnosus, Pseudomonas aeruginosa
Citation
Annals of Microbiology
55
4
55
4