性能描述

保存温度   2-8°C

Biochem/physiol Actions
Piperacillin inhibits the final stage of bacterial cell wall biosynthesis at the level of PBP binding.
Piperacillin inhibits the last stage of bacterial cell wall synthesis by binding to certain penicillin-binding proteins (PBPs), which results in cell lysis. Cell lysis is mediated by bacterial cell wall autolytic enzymes. Piperacillin may interfere with autolysin inhibitors.

Application
Piperacillin is a semisynthetic, broad-spectrum ureidopenicillin antibiotic. It is derived from ampicillin. It has been used in pharmacokinetic studies in order to optimize antimicrobial therapy in patients with sepsis. It is used to study piperacillin hypersensitivity reactions and to study multidrug-resistant organisms.

性状：该品为白色或类白色粉末；无臭；极易引湿。该品在水中或甲醇中极易溶解，在无水乙醇中溶解，在丙酮中不溶。

革兰阳性菌的作用与氨苄西林相似，对肠球菌有较好的抗菌作用，对于某些拟杆菌和梭菌也有一定作用。

对革兰阴性菌的作用强，抗菌谱包括淋球菌、大肠杆菌、变形杆菌、克雷白肺炎杆菌、绿脓杆菌、枸橼酸杆菌、肠杆菌属、嗜血杆菌等，对沙门杆菌、痢疾杆菌、除绿脓杆菌外的一些假单胞菌、脑膜炎球菌、雅森杆菌等虽也在体外有抗菌作用，但其临床意义尚未明确。