Both of the supernatants were pooled together and then passed through Whatman filter paper No. 42 (s.d. Fine Chemicals, India). The extract was stored at 20 C for further studies. Other extracts of curry and mint leaf were also prepared in similar manner as mentioned for EHEC. All extracts were analysed for 2-2-azinobis-3-ethylbenthiazoline-6-sulphonic acid (ABTS+) radical cations, 1,1 diphenyl-2-picrylhydrazil (DPPH) radicals, superoxide anion (SA) scavenging activity and total phenolics. The efficacy of curry and mint leaf extracts was determined based on the weight of respective dry powders.