Optimization of bacteriocin ST311LD production by Enterococcus faecium ST311LD, isolated from spoiled black olives |
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Authors: | Todorov Svetoslav D Dicks Leon M T |
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Institution: | Department of Microbiology, Stellenbosch University, 7600 Stellenbosch, South Africa. |
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Abstract: | Bacteriocin ST311LD is approximately 2.3 kDa in size. Low levels of bacteriocin activity were recorded in BHI and M17 broth (800 AU/ml) and in 10% (w/v) soy milk (3,200 AU/ml). No bacteriocin production was recorded in 10% (w/v) molasses, despite good growth. Optimal levels (12,800 AU/ml) were detected in MRS broth which had been supplemented with tryptone (20.0 g/l), saccharose (5.0 or 10.0 g/l) or vitamin C (1 ppm). Increased potassium levels did not result in higher levels of activity, and glycerol (1.0 g/l) inhibited the production of bacteriocin ST311LD. |
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