乳酸环丙沙星单扫描示波极谱法研究

研究了乳酸环丙沙星的极谱伏安行为，在ｐＨ＝８．３的０．０２ｍｏｌ／Ｌ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ底液中，乳酸环丙沙星能产生１个灵敏的还原峰，峰电位为－１．６１Ｖ，其导数峰高与浓度在３．９×１０＾－８～１．８×１０＾－６ｍｏｌ／Ｌ和１．８×１０＾６～１．１×１０＾－５ｍｏｌ／Ｌ范围内呈现良好的线性关系，相关系数ｒ＝０．９９９７，检测下限为２．５×１０＾－８ｍｏｌ／Ｌ，用于乳酸环丙沙星注射液的测定，相     

锑（Ⅲ）－PMBP配合物极谱波的研究

锑（Ⅲ）－ＰＭＢＰ配合物极谱波的研究王曙，吴永强，廖占和（四川轻化工学院化工系６４３０３３）关键词锑，配合物吸附波，１－苯基－３－甲基－４－苯甲酰基吡唑啉酮－５。多种有机试剂可用于锑配合物极谱催化波的测定￣［１－２］。１－苯基－３－甲基－４－苯甲酰基...     

Electrochemical determination of rosiglitazone by square-wave adsorptive stripping voltammetry method

Square-wave adsorptive stripping voltammetry technique was used to determine rosiglitazone (ROS) on the hanging mercury dropping electrode (HMDE) surface, in Britton Robinson buffer, pH = 5. The voltammetric cathodic peak was observed at ?1520 mV vs. Ag/AgCl reference electrode. The voltammetric peak response was characterized with respect to pH, supporting electrolyte, accumulation potential, preconcentration time, scan rate, frequency, pulse amplitude, surface area of the working electrode and the convection rate. Under optimal conditions, the voltammetric current is proportional to the concentration of ROS over the concentration range of 5 × 10^?8–8 × 10^?7 mol l^?1 (r = 0.9899) with a detection limit of 3.2 × 10^?11 mol l^?1 using 120 s accumulation time. The developed SW-AdSV procedure showed a good reproducibility, the relative standard deviation RSD% (n = 10) at a concentration level of 5 × 10^?7 mol l^?1 was 0.33%, whereas the accuracy was 101% ± 1.0. The proposed method was successfully applied to assay the drug in the human urine and plasma samples with mean recoveries of 90 ± 0.71% and 86 ± 1.0%, respectively.     

Adsorptive Stripping Voltammetry of Some Triazine- and Nitro Group-Containing Pesticides

Abstract

The application of adsorptive stripping analysis in combination with differential pulse voltammetry for the determination of some triazine- and nitro group- containing pesticides like Dinobutone, DNOK, Ametryne and Prometryne is described. Conditions for determinations in the concentration range from approx. 0.1 to 50 ppb are given.     

In pursuit of balgacyclamide A – Discovery of an oxazoline macrocycle with multiple myeloma cytotoxicity and penetration

Four new oxazoline based macrocycles have been constructed, said cycles were found to possess varying cytotoxicity against six different cancer cell lines: IC₅₀ values of 6.4 μM towards HeLa and 11.9 μM towards LnCaP being the most potent. Two of the four macrocycles were found to have marginal cytotoxicity against MM.1S and MM.1R, myeloma cancer cell lines, and further evaluation showed that they also possessed rapid cellular uptake and accumulation characteristics. Through the structure-activity relationship comparisons between the four compounds, it was found that the C6 position of the E-ring is amendable to substitution and could possibly serve as a conjugation site for the development of a selective delivery system to MM.1R.     

滴水感应起电仪的实验及其改进研究

滴水自激感应起电仪,即开尔文滴水感应起电仪,是利用水滴流动与玻璃管摩擦起电,并静电感应循环累积电荷而产生越来越高的电位差的静电起电装置。本文通过对装置的系统划分,研究各部分对最终起电现象的影响,主要在漏电测试、电荷累积测量和仪器装置材料更换等方面来改进仪器装置。经过实验改进后,开尔文滴水感应起电仪的起电效果明显,现象稳定。     

钙－芦丁极谱络合吸附波的研究

在０．０１ｍｏｌ／ＬＫＯＨ底液中（ｐＨ＝１１．７），用单扫示波极谱法可获得钙－芦丁络合吸附波，检出限为８．０×１０－７ｍｏｌ／Ｌ．测得电活性络合物组成为Ｃａ（Ⅱ）∶Ｒｔ＝１∶２，条件稳定常数为β＝４．８×１０１０．电极表面反应速率常数为ｋｓ＝１．２７ｓ－１．     

铬（Ⅵ）－十六烷基三甲基溴化铵极谱吸附波研究

在ｐＨ９．３的Ｎａ２Ｂ４Ｏ７Ｎａ２ＣＯ３缓冲溶液中，铬（Ⅵ）与十六烷基三甲基溴化铵（ＣＴＭＡＢ）在滴汞电极上吸附还原，峰电位－０．３１Ｖ（ｖｓ．ＳＣＥ）．铬（Ⅵ）在１．９×１０－８２．１×１０－６ｍｏｌ／Ｌ范围内与峰高呈线性关系检出限为７７×１０－９ｍｏｌ／Ｌ用于工业废水中铬的测定，结果与光度法一致