Statistical Optimization of Culture Components for Enhanced Bacteriocin Production by Lactobacillus plantarum LR/14

Abstract

Statistical optimization of bacteriocin production by a natural isolate of Lactobacillus plantarum LR/14 was carried out in TGYE medium at 37°C and 200 rpm for 20h. In the first step of optimization using Plackett-Burman design, yeast extract, glucose and incubation period were identified as the most important factors for bacteriocin production. These factors were further optimized by response surface methodology (RSM) to understand their interaction and to determine their optimal levels. Results indicated that the maximum bacteriocin production was achieved in a medium containing glucose 2.0% and yeast extract 2.5%, and after an incubation period of 20h. An overall approximatley eightfold improvement in bacteriocin production was achieved as a result of optimization. These results indicated the importance of statistical tools in designing culture conditions for enhancing the production of bacteriocin from L. plantarum LR/14. Such an improved production will facilitate the application of bacteriocin, especially in food preservation.