title: Electrochemical behavior and differential pulse polarographic determination of piperacillin sodium.
abstract: In an aqueous piperacillin sodium solution, a well-defined single wave or single peak was observed by direct current (DC) polarography or differential pulse polarography (DPP). The peak potential change per pH unit was -54 mV in the phosphate buffer at 18 degrees C, which indicated that protons were involved in the electrochemical reduction of the 2,3-dioxopiperazine moiety of piperacillin sodium with a H+/e- ratio of one. Using a phosphate buffer of pH 4.3, the 1.0 x 10(-7) M piperacillin sodium single peak could be determined by DPP with relative standard deviation of 1.6% (n=3). Piperacillin sodium could be analyzed without interference from penicillin G-potassium, which enabled the employment of DPP as a fast and simple technique for monitoring the synthetic process of the antibiotic.
authors.affiliation: Department of Chemistry, Sangmyung University, Seoul, Korea. yhahn@pine.sangmyung.ac.kr
authors.forename: Y
authors.initials: Y
authors.lastname: Hahn
authors.forename: E
authors.initials: E
authors.lastname: Son
mesh_terms: D002138:Calibration; D004563:Electrochemistry; D010400:Penicillin G / Q000032:analysis / Q000737:chemistry*; D010406:Penicillins / Q000032:analysis / Q000737:chemistry*; D010878:Piperacillin / Q000032:analysis / Q000737:chemistry*; D011048:Polarography / Q000379:methods*
chemical_list: D010406:Penicillins; D010400:Penicillin G; D010878:Piperacillin