共查询到20条相似文献,搜索用时 15 毫秒
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《Analytical letters》2012,45(19):1625-1635
Abstract After being precipitated as silver mercaptides, mercaptans were converted into their pentafluorobenzyl derivatives in high yields by reaction with sodium sulfide and then with pentafluorobenzyl bromide. The derivatives were analyzed down to sub-ppm levels by gas chromatography with a flame ionization detector. It is possible that the above method is developed for the trace analysis of mercaptans in environmental matrices. 相似文献
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碱土金属与萘啶酸配合物荧光特性的研究及其应用 总被引:2,自引:0,他引:2
研究了碱土金属(Mg,Ca,Sr和Ba)离子与喹诺酮类药物萘酸配合物的荧光特性,发现在pH7~9介质中,碱土金属离子与萘啶酸可形成稳定的荧光配合物,其荧光强度随碱土金属离子半径的减小而呈现有规律的增强效应,其中镁离子与萘啶酸配合物的荧光萘啶酸强58倍,利用此配合反应发展了镁离子增强一份导数荧光激发光谱测定萘啶酸的分析方法,其检出限为0.015μg/mL。可直接测定尿液中萘啶酸含量,其回收率为96. 相似文献
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利用标记药物布洛芬及保泰松研究萘啶酸与血清白蛋白的结合作用 总被引:2,自引:0,他引:2
血清白蛋白与萘啶酸的结合,可以猝灭萘啶酸-铽螯合体系的特征荧光,保泰松(Phenylbutazone)及布洛芬(Ibuprofen)等药物在白蛋白的特定结合位置与其具有较强的结合作用,因此,可用作白蛋白分子结合位置的标记物。本文以保泰松或布洛芬作标记物,探讨了牛血清白蛋白及人血清白蛋白对萘啶酸-铽螯合体系特征荧光的不同影响方式,并根据蛋白结合位上药物的置换作用确定了萘啶酸在牛血清白蛋白分子上的结合位置。 相似文献
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《Analytical letters》2012,45(5):429-438
Abstract Methods have been developed for the qualitative and quantitative analysis of hydroxy and keto derivatives of methyl cholanates utilizing a ¼″ by 1′ μPorasil column, various mixtures of hexane and ethyl acetate and a refractive index detector. The system has been calibrated for some of the methyl dihydroxycholanates using 3α;,7α-dihydroxy-12-oxocholanate as an internal standard and applied to the analysis of the mixtures of diols resulting from the reduction of methyl 3,12-dioxocholanate with NaBH4 and with Raney nickel. 相似文献
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A gas chromatographic method was established for the quantitative analysis of pipemidic acid. The method is based on alkylation of pipemidic acid with diazomethane catalyzed by boron trifluoride. The sample was chromatographed on a stainless steel column packed with 5% OV-101 on Chromosorb G-HP and n-octacosane was used as an internal standard. Quantitation is achieved by measuring peak-height ratio. The method was satisfactorily applied to the analysis of pipemidic acid in tablet. 相似文献
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过氧乙酸消毒剂中多组分的快速反相液相色谱测定 总被引:1,自引:0,他引:1
用反相C18色谱柱,采用离子抑制色谱法,在不经过衍生的情况下,同时测定了过氧乙酸消毒剂中过氧乙酸(PAA)、H2O2(H2O2)、乙酸(HAc)的含量。本方法以酸性磷酸盐为缓冲溶液,抑制PAA和HAc在流动相中的离解,提高其容量因子,使组分间能达到很好的分离;利用磷酸盐缓冲溶液在紫外210nm以下吸收强度较水低的特性,降低了基线噪音,提高了过氧化物和羧酸测定的灵敏度。各组分的检出限分别为2.3ng(PAA),2.1ng(H2O2)和30ng(HAc)。 相似文献
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反相高效液相色谱法同时测定人血浆中的西诺沙星和萘啶酸 总被引:4,自引:0,他引:4
提出了同时测定人血浆中的西诺沙星和萘啶酸的高效液相色谱方法。采用反相C18柱、254nm紫外检测,乙腈-甲醇-0.01mol/L草酸(30:5:65,V/V;pH4.55)体系,实现了二者的良好分离。分别考察了磷酸缓冲溶液和草酸缓冲溶液作为流动相弱溶剂,结果草酸缓冲溶液能有效改善峰形、降低检测限。在不同pH值(pH2.80,4.08,4.55)进行了实验,pH4.55获得最佳分离,最低检测量分别为0.14ng(西诺沙星)和0.24ng(萘啶酸),比文献报道的同类药物最低检测量低10倍。 相似文献
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通过室温浸泡和回流改性的方式,制备了苄基膦酸改性氧化锆色谱固定相.元素分析表明,室温浸泡和加热回流都能够得到较大膦酸吸附量.红外光谱、差热分析证实苄基瞵酸是以Lewis酸碱作用吸附在氧化锆表面的.色谱分析该固定相具有很好的疏水性能和离子交换性能,对某些碱性物质的分离有一定的应用前景. 相似文献
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《Analytical letters》2012,45(13-14):1421-1433
Abstract Amides of 14 carboxylic acid herbicides were prepared by reacting the free acid with the amine in toluene for 1 hr at 80[ddot]C in the presence of PCl3 or P2I4. The acids include phenoxyacetic acids, arylacetic acids, and benzoic acids. Aniline, o-toluidine, 3,5-bis(trifluoromethyl)aniline, piperidine, and tetrahydroquinoline were the amine components. Excess of reagents and by-products of the reaction were removed by partitioning into aqueous acid and base. Retention times relative to 2,4-D anilide on 1% OV-22 and FSOT RSL-150 columns are listed for the anilides and should be useful for confirmation purposes. The anilides of 2,4-D, silvex and 2,4,5-T were obtained in better than 90% yield. 相似文献
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拟多维高效液相色谱及其应用于苯甲酸衍生物的分离 总被引:3,自引:0,他引:3
利用一种新的高效液相色谱洗脱技术,采用PH缓冲液/有机溶剂二元洗模式,对苯甲酸衍生物系列与苯衍生物系列混合物在反相柱上进行分离,得到好的分离效果。 相似文献
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血清中阿斯匹林和水杨酸浓度的快速高效液相色谱法测定 总被引:3,自引:0,他引:3
A fast method for determining concentrations of aspirin and salicylic acid in serum using reversedphase high performance liquid chromatography with Spherisorb C18 column,MeOH i H2O: n-BuOH : H3PO4 (300:200 :10 :0. 5,volume ratio) eluent and UV-237 detector was eatablished. The linear range of the method is 1-20μg/mL (r=0. 9996)for aspirin and 2 30μg/mL (r=0. 9981) for salicylic acid. The averagerecoveries are 96. 0 %-106. 0% and 92. 0%-119.5% ,respectively. 相似文献