Optimization of Bacteriocin ST311LD Production by Enterococcus faecium ST311LD, Isolated from Spoiled Black Olives
2005
Todorov, Svetoslav D. (Stellenbosch University, Stellenbosch, South Africa) | Dicks, Leon M.T. (Stellenbosch University, Stellenbosch, South Africa), E-mail: [email protected]
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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