李萍,张兰,舒展,胡矗垚,闫静坤,汪青青

• 1:天津农学院基础科学学院

摘要(Abstract)：

以肉桂醛、索氏和超声波提取的肉桂油为试样,讨论样品加入量、浓度、打孔直径及评价指标对琼脂-孔洞扩散法测定物质抑菌活性的影响。结果表明:抑菌活性与样品加入量和浓度都呈正相关,9,11mm孔径的加液量分别为50~70μL和70~90μL比较适宜,应用2倍或3倍梯度稀释法可进行定量分析,较快找到被测物质对供试菌种的最小抑菌浓度。采用样品抑菌圈直径与空白抑菌圈直径的差值作为抑菌活性的评价指标比抑制率更加合理。GC-MS分析表明:索氏和超声波提取的肉桂油主要成分都是肉桂醛,含量分别为60.93%和37.86%。肉桂醛的抑制活性好于索氏和超声波提取的肉桂油,说明肉桂醛也是肉桂油的主要抗菌成分之一。肉桂醛、索氏和超声波提取的肉桂油均对细菌的抑制作用最强,其次是酵母,对霉菌的抑制作用较弱,但浓度为333.33mg/mL的3种试样对黑曲霉的抑制率分别为60.00%,52.63%和47.06%,展现了一定的抑菌效果。肉桂油作为天然植物源抗菌剂用于食品保鲜领域具有一定的参考价值。

关键词(KeyWords)： 抑菌活性;琼脂-孔洞扩散法;样品加入量;样品浓度;孔径大小;评价指标

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李萍,张兰,舒展,胡矗垚,闫静坤,汪青青

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