性能描述

Biochem/physiol Actions
Erythromycin inhibits protein synthesis (elongation) at the level of transpeptidation (aminoacyl translocation A-site to P-site) by binding to the 50s subunit of the bacterial 70s rRNA complex.
Erythromycin inhibits protein synthesis (elongation) at the level of transpeptidation (aminoacyl translocation A-site to P-site).

Application
Erythoromycin estolate is used to study hepatic cytochrome P-450 induction and inactivation via cytochrome-metabolite complex formation and Giardia intestinalis inefections. It is used to study antibiotic cytotoxicity in cultured human liver cell lines.

性状：白色结晶性粉末；无味或几乎无味。该品在乙醇或氯仿中易溶，在水中几乎不溶。熔点 取该品，置五氧化二磷干燥器中干燥后，依法测定，熔点为132～138℃。

产品用途：属大环内酯类抗生素，为红霉素丙酸酯的十二烷基硫酸盐，对葡萄球菌属、各组链球菌和革兰阳性杆菌均具抗菌活性。奈瑟菌属、流感嗜血杆菌、百日咳鲍特氏菌等也可对该品呈现敏感。该品对除脆弱拟杆菌和梭杆菌属以外的各种厌氧菌亦具抗菌活性；对军团菌属、胎儿弯曲菌、某些螺旋体、肺炎支原体、立克次体属和衣原体属也有抑制作用。该品系抑菌剂，但在高浓度时对某些细菌也具杀菌作用。该品可透过细菌细胞膜，在接近供位（“P”位）处与细菌核糖体的50S亚基成可逆性结合，阻断了转移核糖核酸（t-RNA）结合至“P”位上，同时也阻断了多肽链自受位（“A”位）至“P”位的位移，因而细菌蛋白质合成受抑制。该品仅对分裂活跃的细菌有效。