Comparatively, S. aureus was less sensitive to the inhibitory activit yof the onions and garlic extracts than S. Enteritidis which was more inhibited at same concentrations of EO extracts. The inhibitoryacti vityof essential oils extracts of onions or other Allium plants was not extensivelyreport ed except garlic extract which was widelyinvest igated. On the other hand, S. aureus was extensivelystudied and its sensitivityto essential oils extracts was widelydiscus sed. Kyung, Kim, Park and Kim (2002) reported that allicin of garlic extract showed strong antibacterial activity against S. aureus at 150 ml/l concentration. This antibacterial activitywas enhanced and highest when garlic extract was heated for 45 min at 121C. The antibacterial activityof other and close, chemically, cysteine sulfoxides (S-methyl-l-CS and methyl methane- CS) of cabbage also was markedlyobserved , particularlycon centrations of 10, 20 and 50 mg/l (Kyung, Han,& Fleming, 1997). Alrozekyand Nakahara (2002) reported weak antibacterial activityof extracts from some edible plants commonlycon sumed in Asia.Combined extracts of corni fructus, cinnamon and Chinese chive (1:6:6, vol/vol/vol) exhibited low inhibitoryeffect
against this bacteria than other combined ratios and against other bacterial species (Hsieh et al., 2001). Although the paper disk assayis a practical approach to studypotenti al antibacterial compounds, using the size of inhibition zone to indicate relative antibacterial activityof the essential oils is not adequate. The zone must be affected bythe solubility and rate of diffusion in agar medium or its volatilization; and thus the results could be affected. 3.2
Comparatively, S. aureus was less sensitive to the inhibitory activit yof the onions and garlic extracts than S. Enteritidis which was more inhibited at same concentrations of EO extracts. The inhibitoryacti vityof essential oils extracts of onions or other Allium plants was not extensivelyreport ed except garlic extract which was widelyinvest igated. On the other hand, S. aureus was extensivelystudied and its sensitivityto essential oils extracts was widelydiscus sed. Kyung, Kim, Park and Kim (2002) reported that allicin of garlic extract showed strong antibacterial activity against S. aureus at 150 ml/l concentration. This antibacterial activitywas enhanced and highest when garlic extract was heated for 45 min at 121C. The antibacterial activityof other and close, chemically, cysteine sulfoxides (S-methyl-l-CS and methyl methane- CS) of cabbage also was markedlyobserved , particularlycon centrations of 10, 20 and 50 mg/l (Kyung, Han,& Fleming, 1997). Alrozekyand Nakahara (2002) reported weak antibacterial activityof extracts from some edible plants commonlycon sumed in Asia.Combined extracts of corni fructus, cinnamon and Chinese chive (1:6:6, vol/vol/vol) exhibited low inhibitoryeffect
against this bacteria than other combined ratios and against other bacterial species (Hsieh et al., 2001). Although the paper disk assayis a practical approach to studypotenti al antibacterial compounds, using the size of inhibition zone to indicate relative antibacterial activityof the essential oils is not adequate. The zone must be affected bythe solubility and rate of diffusion in agar medium or its volatilization; and thus the results could be affected. 3.2
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