A contrast research of bacteriostatic effect by three common liliaceous plants

The comparison of bacteriostasis of water extracts from three common edible liliaceous allium plants on Escherichia coli O157∶ H7, Salmonella enteritidi, Vibrioparahaemolyticus, Staphylococcus aureus, Listeriamonocytogenes were conducted by MIC ( minimum bacteriostatic concentration) and Agar diffusion method.The results showed that water extracts from three plants had bacteriostatic effect on the five food- borne bacterial strains with concentration- dependent.When the addition level of extracts was 50μg ( dry weight) , both water extracts from Allium Mongolicum Regel ( AMR) and Allium Sativum ( AS) displayed the highest inhibitory effect against Staphylococcus aureus among five kinds of food- borne bacteria strains, with their bacteriostatic circle diameters ( 41.7 ± 1.52) mm and ( 29.3 ± 2.08) mm, respectively.Water extracts from Allium Tuberoun ( AT) had the best inhibitory effect on Salmonella enteritidi ( bacteriostatic circle diameter ( 17.7 ± 0.57) mm.AMR showed the higher inhibitory effect than As on Escherichia coli O157∶ H7, Staphy lococcus aureus, Salmonella enteriticli, Vibrioparahae molyticus, and showed the lower inhibitory effect than As on Listeria monoly toyenes.The results of MIC indicated that size order of antimicrobial susceptibility of extracts tended to be: AS > AMR > AT