data oil

· Essential oils from oregano and laurel are known for antimicrobial activity, supporting interest in their use against mastitis bacteria in cattle, which increasingly show resistance to many antibiotics.· Oil composition was analyzed by gas chromatography–mass spectrometry, and antibacterial activity was evaluated in vitro against mastitis isolates, including strains producing enzymes that deactivate β-lactam antibiotics.· Oregano oil contained terpinen-4-ol and δ-terpinene, while laurel oil was rich in methyleugenol and eucalyptol; both showed strong activity with large inhibition zones and low inhibitory concentrations.· The results indicate these oils are promising natural alternatives for controlling resistant mastitis pathogens.<br>

· 牛至与月桂精油因其抗菌活性而广为人知，这使得学界对其用于对抗牛乳腺炎致病菌的研究兴趣日益浓厚——这类致病菌如今对多种抗生素愈发表现出耐药性。· 研究采用气相色谱-质谱联用法（gas chromatography–mass spectrometry）分析了两种精油的成分，并通过体外实验评估了其对乳腺炎分离菌株的抗菌活性，其中涵盖了能够产生灭活β-内酰胺类抗生素（β-lactam antibiotics）的酶的菌株。· 牛至油含有萜品烯-4-醇与δ-萜品烯，而月桂精油则富含甲基丁香酚和桉叶素；二者均展现出强劲的抗菌活性，可形成较大的抑菌圈，且抑菌浓度较低。· 研究结果表明，这两种精油有望成为防控耐药性乳腺炎致病菌的天然替代方案。