Inhibitory Activity of Lactoferrin and Lysozyme in Raw Cow Milk against Bacillus stearothermophilus.
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概要
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Properties of raw milk, which derived from dairy cows having no antibiotic treatment but showed inhibitory activity against <I>Bacillus stearothermophilus</I> in a paper disk test (PDT), were studied cytologically and biochemically. The total number of cells, the number of polymorphonuclear leukocytes (PMN), and the concentration of lactoferrin (Lf) and lysozyme (Ly) in PDT-positive milk were higher than in PDT-negative milk. A correlation was found between the diameter of the inhibition zone and the total number of cells, the number of PMN, or the concentration of Lf and Ly. The Lf showed the highest correlation with the diameter of the inhibitory zone. The egg Ly showed the highest inhibiting activity against the bacterial suspension when the suspension was examined by the optical density, followed by PDT-positive whey, human Lf, PDT-negative whey, and penicillin. When bacterial cells were observed by transmission electrom microscopy, morphological changes caused by PDT-positive whey resembled those of human Lf. The results indicate that the PDT-positive reaction with milk with no antibiotic residue is caused mainly by Lf derived from PMN originating from mammary gland inflammation, and that the reaction is accelerated by the presence of Ly.
- 公益社団法人 日本獣医師会の論文
公益社団法人 日本獣医師会 | 論文
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