*Department of Dairy Bacteriology, University of Animal and Fishery Sciences, West Bengal
**Department of Agricultural Chemistry and Soil Sciences, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal-741 235, India.
Online published on 31 October, 2011.
The effect of fenvalerate (1–100 ppm) on the growth and fermentation ability of lactic cultures was studied. L. lactis subsp. lactis, L. lactis subsp diacetilactis DRC-1, L. delbreuckii subsp. bulgaricus (W) and S. thermophilus (H) did not exhibit similar biological activity in terms of growth and acid production. The bactericidal effect was dependent upon the insecticide concentrations. Concentration upto 1 ppm had no effect on growth and lactic acid production in sterile whole milk, when incubated for 48 h at appropriate temperatures. Lactococcus lactis sub sp. lactis was the most resistant, whereas L. delbrueckii subsp. bulgaricus (W) was the most sensitive in respect of growth and acid production. Fenvalerate had a bacteriostatic effect on the growth and acid production of S. thermophilus (H) at 25 and 100 ppm concentration.
Fenvalerate, lactic acid bacteria, growth, lactic acid production
