Matsuura M, Nakazawa H, Hashimoto T, Mitsuhashi S
Antimicrob Agents Chemother. 1980 Jun;17(6):908-11. doi: 10.1128/AAC.17.6.908.
Strains of bacteria resistant to beta-lactam antibiotics have been increasing in number and are becoming troublesome in clinical medicine. The in vitro antibacterial activity of amoxicillin combined with clavulanic acid was determined on selected ampicillin-resistant clinical isolates. Synergistic effects were produced by amoxicillin with clavulanic acid against ampicillin-resistant strains of Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Proteus vulgaris, and Bacteroides fragilis. Inhibition of the beta-lactamases produced by the ampicillin-resistant strains was confirmed, especially against the penicillinases mediated by the R factor and the cephalosporinases produced by P.vulgaris and B. fragilis. The inhibitory effect of clavulanic acid against beta-lactamases was irreversible because of the high affinity of clavulanic acid to the enzymes.
对β-内酰胺类抗生素耐药的细菌菌株数量一直在增加,并且在临床医学中变得棘手。对选定的耐氨苄西林临床分离株测定了阿莫西林与克拉维酸联合的体外抗菌活性。阿莫西林与克拉维酸对耐氨苄西林的金黄色葡萄球菌、大肠杆菌、肺炎克雷伯菌、奇异变形杆菌、普通变形杆菌和脆弱拟杆菌菌株产生协同作用。证实了克拉维酸对耐氨苄西林菌株产生的β-内酰胺酶有抑制作用,尤其是对由R因子介导的青霉素酶以及由普通变形杆菌和脆弱拟杆菌产生的头孢菌素酶。由于克拉维酸对这些酶具有高亲和力,其对β-内酰胺酶的抑制作用是不可逆的。