Industrial cheese whey utilization for enhanced production of purified pediocin PA-1

The present study was carried out to screen the pediocin producer strains viz., Pediococcus pentosaceous NCDC 273, Pediococcus acidilactici NCDC 252 P. pentosaceous NCDC 35, Enterococcus faecium NCDC 124 and Lactobacillus plantarum NCDC 20 for their ability to utilize lactose, to optimize pediocin production using response surface methodology (RSM) and to purify pediocin using aqueous-two phase system (ATPS). Screening of five pediocin-producer strains for lactose utilizing capability showed that P. pentosaceous NCDC 273 and P. acidilactici NCDC 252 express beta-gal gene. Response surface data showed maximum pediocin PA-1 production of 2.61 x 10(4) AU/ml at an initial pH of 7.0,temperature 29.8 degrees C, and cheese whey concentration 82.8 g l(-1) from P. pentosaceous NCDC 273 and 3.22 x 10(3) AU/ml at an initial pH of 6.95, temperature 28.2 degrees C, and CWC 77.79 g l(-1) from P. acidilactici NCDC 252. The pediocin PA-1 produced by both the strains was purified using the ATPS and characterized for purity and activity. PEG/potassium phosphate system was found to be efficient in purifying the pediocin PA-1, which was then ultrafiltered and lyophilized. Our results showed the efficient production of purified pediocin PA-1 at reduced cost. (C) 2014 Elsevier Ltd. All rights reserved.