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题名: Inhibitory effect of propolis extract on the growth of Listeria monocytogenes and the mutagenicity of 4-nitroquinoline-N-oxide
作者: Hsin-Yi Yang;Cheng-Ming Chang;Yue-Wen Chen;Cheng-Chun Chou
贡献者: 國立臺灣海洋大學:食品科學系
关键词: propolis;Listeria monocytogenes;susceptibility;antimutagenicity
日期: 2006
上传时间: 2016-03-07T01:25:29Z
出版者: J Sci Food Agric
摘要: Abstract:Propolis originates from a resinous substance collected by honeybees from the buds and leaves of
trees and plants, which is then mixed with pollen as well as enzymes secreted by the bees. In the present study,
the susceptibility of Listeria monocytogenes to the ethanol extract of propolis (EEP) as influenced by EEP
concentration, incubation temperature, pH, and cell age was investigated. In addition, the antimutagenic action
of EEP against 4-nitroquinoline-N-oxide (4-NQO) was also examined. Results revealed that EEP at a dosage of
7.5 µg mL−1 or higher exerted a bactericidal effect on L. monocytogenes. L. monocytogenes was most susceptible to
EEP at 37 ◦C followed by 25 and 4 ◦C. At acid pH values, cells of the test organism were more sensitive to EEP than
at neutral pH, while most resistant at alkaline pH values. Cell age was also found to affect the susceptibility of L.
monocytogenes to EEP. Cells in the mid-exponential phase showed the highest susceptibility, followed by cells in
the late-exponential phase and stationary phase. EEP caused cell leakage of the test organism. A marked increase
in the absorbance at 260 nm, UV-absorbing material in the supernatant of cell suspension, and irregularly shaped
materials around the cell surface were noted after cells of L. monocytogenes were exposed to EEP. Furthermore,
EEP at a dosage of 7.5–60.0 µg per plate was found to suppress 4-NQO-induced mutation by 17.6–88.8%
關聯: 86,pp.937-943
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37479
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