排序方式: 共有89条查询结果,搜索用时 15 毫秒
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涂碳型PVC膜氧氟沙星选择电极的研制与应用 总被引:2,自引:0,他引:2
报道了一种以氧氟沙星碘化物与碘化铋的分子缔合物为电活性物的新型涂碳PVC膜氧氟沙星选择电极.电极的能斯特响应范围为1.0×10-5~3.2×10-2mol/L,斜率为31mV/pC,电极响应迅速,重现性好.用此电极对药片中的氧氟沙星进行测定,结果与紫外分光光度法相符. 相似文献
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The novel chemiluminescence (CL) reaction systems were established for lomefloxacin (LMFX), ofloxacin(OFLX), norfloxacin (NFLX), gatifloxacin (GAFX) and enoxacin (ENX). The sensitized CL emission mechanism was investigated for the five systems by comparing the fluorescence emission with CL spectra. For LMFX-Ce(IV)-S2O32−-H2SO4 and OFLX-Ce(IV)-S2O42−-H2SO4 systems, the CL intensity is enhanced through intermolecular energy transfer from the excited SO2* to LMFX and OFLX. For NFLX-Ce(IV)-S2O42−-HNO3 system, the sensitized CL is based on intermolecular energy transfer from the excited SO2* to NFLX oxide. For Eu3+-GAFX-Ce(IV)-S2O42−-HCl and Dy3+-ENX-Ce(IV)-S2O32−-H2SO4 systems, the CL spectra are from the narrow characteristic emission at 590, 619 and 649 nm of Eu3+* (5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3) and at 482 and 578 nm of Dy3+ (4F9 → 6H15/2, 4F9 → 6H13/2) through intermolecular energy transfer from the excited SO2* to GAFX and ENX, followed by intramolecular energy transfer from GAFX* to Eu3+ and ENX* to Dy3+. The conditions of CL emission were investigated and optimized. The proposed five enhanced CL systems have good linearity, higher sensitivity, precision and potential capability for residue analysis of studied analytes in foods and biological samples. 相似文献
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荧光光度法测定抗生素氧氟沙星 总被引:9,自引:2,他引:9
本文报道了采用荧光分光光度法测定喹喏酮类抗生素氧氟沙星,该方法有较高的灵敏度,在氧氟沙星浓度为0.500ppm至25.0ppm间,荧光强度与浓度有良好的线性关系,线性相关系数为0.9999,回收率为99.0%测定结果与紫外分光光度法测量结构无显著性差异。 相似文献
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Christina Vakh Aleksei Pochivalov Vasil Andruch Leonid Moskvin Andrey Bulatov 《Analytica chimica acta》2016
A novel fully automated effervescence-assisted switchable solvent-based liquid phase microextraction procedure has been suggested. In this extraction method, medium-chain saturated fatty acids were investigated as switchable hydrophilicity solvents. The conversion of fatty acid into hydrophilic form was carried out in the presence of sodium carbonate. The injection of sulfuric acid into the solution decreased the pH value of the solution, thus, microdroplets of the fatty acid were generated. Carbon dioxide bubbles were generated in-situ, and promoted the extraction process and final phase separation. The performance of the suggested approach was demonstrated by the determination of ofloxacin in human urine samples using high-performance liquid chromatography with fluorescence detection. This analytical task was used as a proof-of-concept example. Under the optimal conditions, the detector response of ofloxacin was linear in the concentration ranges of 3·10−8−3·10−6 mol L−1. The limit of detection, calculated from a blank test based on 3σ, was 1·10−8 mol L−1. The results demonstrated that the presented approach is highly cost-effective, simple, rapid and environmentally friendly. 相似文献
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A simple, rapid and sensitive method for the determination of two fluoquinolones (FQs), enoxacin (ENX) and ofloxacin (OFLX) is described by using flow injection analysis with potassium permanganate-sodium sulfite chemiluminescence detection. The calibration graphs for ENX and OFLX are linear in the range of 8.0×10−10-1.0×10−5 and 1.0×10−9-1.0×10−6 mol l−1, respectively. The 3σ limits of detection are 2.4×10−10 mol l−1 for ENX and 5.6×10−10 mol l−1 for OFLX. The method is applied satisfactorily to the determination of the two FQs in dosage form and urine sample. The possible mechanism is also proposed. 相似文献