Simultaneous Determination of Acetaminophen and Phenobarbital in Suppositories by Partial Least-Squares Spectrophotometric Calibration

Abstract

The use of partial least-squares spectrophotometric calibration for the simultaneous determination of suppositories in a multicomponent formulation is presented. This method is applied to the deternination of acetaminophen and phenobarbital in suppository preparations. The results show that these components in a molar ratio of about 61:1 in suppositories have been determined simultaneously with high precision.     

A Field Effect Transistor Sensitive to the Phenobarbical Anion

Abstract

A field effect transistor sensitive to the phenobarbital anion is described. The response is Nernstian between 10^?1 mol 1^?1 and 10^?4 mol 1^?1 in the absence of added hydroxide, and 10^?1 mol 1^?1 to 10^?3 mol 1^?1 in the presence of added hydroxide. Selectivities over sulphate, chloride, nitrate, hydrogen phosphate have been determined and speed of response and stability are greater than the corresponding coated wire electrode.     

胶束液相色谱法同时测定血浆中的苯巴比妥、艾司唑仑和氯硝西泮

采用胶束液相色谱法(MLC)分离测定血浆中苯巴比妥、艾司唑仑和氯硝西泮,运用三相平衡理论探讨了流动相中表面活性剂浓度(CM)、氢离子浓度(CH)、助表面活性剂浓度(Cφ)对溶质保留行为的影响,同时运用多元线性回归建立了保留因子的对数(log k)与溶质性质参数和流动相组成之间的相关模型。结果表明,溶质保留因子(k)随CM、Cφ和CH的增加而减小,与理论模型完全一致。而且log k与溶质的疏水性常数的对数(log P)和电离常数(Ka)以及CM、CH和Cφ之间呈现良好的多元线性关系。在确定的色谱条件下,血浆中的3种药物与其他组分之间有较好的分离效果。3种药物的血药浓度分别在2.5～50 mg/L、0.25～5.0 mg/L和0.05～5.0 mg/L间具有良好的线性关系。本方法简便、准确、重现性良好、灵敏度高。3种药物的最低检出限(S/N=3)分别为10.27、1.17、0.867 ng,平均加标回收率范围分别为99.80%～102.9%, 94.00%～98.20%和96.30%～98.70%。     

高效液相色谱法同时测定血清中茶碱、苯妥英钠、苯巴比妥及卡马西平的药物浓度

报道了用高效液相色谱法（HPLC）同时测定血清中茶减、苯妥莫纳、苯巴比妥及卡马西平的药物浓度。实验条件:Nova-PahC18柱，流动相为甲醇-水（1:1，V／V），检测波长210nm，流速为1mL／min，萃取液为级访-异丙醇（95:5，V／V）。方法具有灵敏（10-9）、准确（回收率在97％～105％之间）、快速（7min）等特点，对临床血药浓度监测有实际应用价值。     

改良型比光谱-导数分光光度法在四元混合体系同时测定中的应用

提出了可应用于四元混合体系同时测定的比光谱-导数分光光度法，阐述了该方法的基本原理，并将其应用于氨基比林、苯巴比妥、咖啡因和非那西丁四元混合体系中各组分的同时测定。结果表明，氨基比林、笨巴比妥、咖啡因和非那西丁的回收率分别是109．3％（RSD=4．3％）、102．4％（RSD=6．6％）、108.7％（RSD=5．1％）、98．62％（RSD=3．2％）。方法的准确度和精密度都可以满足四组分同时测定的要求，方法简单、快速。     

Redox labeling of two antiepileptic drugs with metallocenes and their simultaneous detection by a Nafion-modified electrode

Two different cationic redox labels, i.e. a ferroceneammonium ion and a cobaltocenium ion, were covalently attached to two antiepileptics, phenytoin and phenobarbital, respectively. The two labeled drugs possess distinct standard redox potentials of 0.39 V for the phenytoin derivative and −0.92 V for phenobarbital derivative (vs Ag/AgCl, Cl⁻ 0.05 M ) at a carbon paste electrode. After preconcentration in a polyanionic Nafion-loaded carbon paste electrode the positively charged labeled phenytoin and phenobarbital derivatives could be simultaneously detected in concentration ranges which were relevant to the therapeutic ranges of the antiepileptics, with a view to a future dual-analyte immuno- assay. Square-wave voltammetry permitted detection limits of 5×10⁻⁸ M (for the phenytoin derivative) and 2.5×10⁻⁸ M (for the phenobarbital derivative) for non-simultaneous detection. © 1998 John Wiley & Sons, Ltd.     

Investigation of the interaction between acidic,basic, neutral,and zwitterionic drugs with poly-<Emphasis Type="Italic">L</Emphasis>-lactic acid by thermal and analytical methods

This project investigated the interaction between poly-L-lactic acid (PLLA) and several therapeutic agents. Low percentage crystallinity PLLA (melt-pressed, molded and drawn) was studied. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were used to characterize the crystallinity and thermal properties in a thermal cycling process. Repeatable melting and crystallization events were observed. The thermal properties of a drug-polymer combination using PLLA and an acidic, basic, neutral and zwitterionic material were investigated. A sufficient quantity of the drug must be present in the polymer to be observed thermally. Release of atropine sulfate from a PLLA tablet showed a two-phase process.     

Determination of Ethosuximide,Phenobarbital, Carbamazepine,Carbamazepine Epoxide and Phenytoin in Serum by high performance liquid chromatography using Radially compressed Columns and an Aqueous methanolic mobile phase

Abstract

A liquid chromatographic method for the determination of antiepileptic drugs in serum is described. The drugs were adsorbed on activated charcoal from which they were recovered by extraction with methylene chloride. The organic extracts were evaporated to dryness and the residues were dissolved in small volumes of the mobile phase. The extracts were clean. Only trace amounts of endogenic compounds were detected. The chromatographic separation was performed with a radially compressed column (C18) that was used daily for several months.     

气相色谱-质谱同时测定猪肉中3种巴比妥药物残留

建立了固相萃取-气相色谱-质谱同时分析猪肉中3种巴比妥类药物残留量的方法。对猪肉样品的乙腈提取、C18固相萃取柱净化和碘甲烷甲基化条件进行了优化。采用HP-5毛细管柱分离,电子轰击电离源质谱选择离子模式(SIM)检测(巴比妥m／z126,169,183,184;异戊巴比妥m／z169、170、184、226;苯巴比妥m／z175、232、245、260;dwell time80s),外标法定量(定量离子m／z分别为169、169和232)。3种巴比妥药物的添加标准曲线线性回归系数均在0．99以上;线性范围2．5～50μg/kg,回收率为65％～112％,相对标准偏差5．4％～17．2％,检出限均为1μg/kg。