高效液相色谱法测定人血清中格列齐特

A rapid and simple HPLC method was developed for the quantitative analysis of gliclazide in humanserum. After being extracted with benzene, gliclazide was analyzed by reversedphase HPLC colurnn (YWG-C(18)H(37)) and UV-detector(229nm) with tolbutamide as internal standard. The mobile phase was a mixture ofmethyl alcohol and 0.2%glacial acetic acid solution(5: 4 ) at a rate of 1mL/min. Over the concentrationrange of 0.25～32μmol/L, the linear regression equation was : Y=-0. 008412+0.1817X(n=8,r=0. 9996).     

高效液相色谱法测定人血清中头孢克罗

建立了测定人血清中头孢克罗的高效液相色谱法。分析柱为Ｓｈｉｍ－ｐａｃｋＣＬＣ－ＯＤＳ（５μｍ）,６．０ｍｍ×１５０ｍｍ;流动相为磷酸盐缓冲液（ｐＨ５．８）∶乙腈＝８７．５∶１２．５,流速为１．２ｍＬ／ｍｉｎ;紫外检测波长为２５４ｎｍ。血清中头孢克罗浓度在０．１２５～２４ｍｇ／Ｌ范围内,峰高与浓度呈良好的线性关系,回归方程为Ｈ＝－３．２００＋９２．２９Ｃ（ｎ＝９,ｒ＝０．９９９９）,日内、日间变异系数分别为４．１％和５．８％,平均回收率为９９．３％。     

人血清中吗啡含量的高效液相色谱法测定

采用C18 色谱柱 ,体积比70∶30的甲醇 -0.02mol·L-1 磷酸二氢钾缓冲液 (含0.001mol·L-1 三乙胺 ,pH=6.60)作流动相 ,紫外检测波长230nm ,可待因作内标 ,建立了反相高效液相色谱法测定人血清中吗啡含量的方法 ;对流动相、样品预处理和储备液稳定性进行了考察 ,提出用乙酸乙酯直接萃取血清中的吗啡 ,所得样品稳定性好 ,萃取回收率为74 %～80 %;该法快速 ,适于生物样品中吗啡含量的测定。     

高效液相色谱法测定人血清中假尿嘧啶核苷的浓度

应用反相高效液相色谱法测定人血清中假尿苷（ＰＤ）的含量,色谱柱为Ｎｏｖａ－ＰａｋＣ１８３．９ｍｍ×１５０ｍｍ,流动相为０．０４ｍｏｌ／Ｌ磷酸二氢钾缓冲液（ｐＨ４．０）,检测波长为２６３ｎｍ,线性范围为０．７～６．８μｍｏｌ／Ｌ,回收率为９３．５０％,日间误差ＣＶ＝３．１１％（ｎ＝６）。同时测定了部队体检正常人血清中ＰＤ的浓度,并用于临床观察肝炎、肾病、肺癌等多种疾病以及Ｈｅ－Ｎｅ激光治疗前后患者血中ＰＤ含量的变化。正常人血中ＰＤ的浓度无性别差异,成年人的正常值与文献一致。     

高效液相色谱法测定人血清中鬼臼乙叉甙浓度

建立了测定血清中鬼臼乙叉甙浓度的反相高效液相色谱方法。血清样品以乙酸乙酯提取,加表鬼臼毒噻吩糖甙作内标,以甲醇∶水（５５∶４５）为流动相,紫外２５４ｎｍ检测,最低检测浓度０．１ｍｇ／Ｌ,在药物浓度为０．５～５０ｍｇ／Ｌ范围内有良好的线性关系,Ｙ＝０．０１６０＋０．０３４０Ｘ,ｒ＝０．９９９１,回收率达９５．０％。日内、日间精密度分别为４．１６％和４．７６％（ｎ＝５）。用所建立的方法测定了患者的血清浓度,结果表明,方法简便、灵敏。     

固相萃取反相高效液相色谱法测定人血清中洛美利嗪浓度

实验建立了固相萃取反相高效液相色谱法测定血清中洛美利嗪的浓度。采用W aters Oasis HLB萃取小柱对血清样品进行固相萃取,以氟桂利嗪为内标,在W aters高效液相色谱系统上,C8为固定相,乙腈-水(67∶33,含0.2%三乙胺,磷酸调节pH至6.5)为流动相,流速:1 mL/m in;检测波长:223 nm;柱温:30℃;实验结果显示洛美利嗪和内标物洗脱时间分别为9.9 m in和10.8 m in,与血中内源性杂质得到良好分离。方法的相对回收率为99.6%~106.1%;绝对回收率为61.8%~86.5%;日内日间变异RSD范围分别为3.6%~5.3%和2.7%~6.9%;线性范围为5~320μg/L(n=7,r=0.9998)。当S/N=3时,洛美利嗪最低检出浓度可达5μg/L。所建方法准确、灵敏,可满足血药浓度监测和药代动力学参数测试的需求。     

高效液相色谱法测定生物组织中的组胺

通过比较各种分析柱的分离效果,建立了用离子交换柱分离,邻苯二甲醛柱后衍生荧光检测分析生物组织中组按的液相色谱方法,并对流动相的离子强度和ＰＨ进行了优化,确定了４０ｍｍｏｌ／ＬｐＨ５．５０的柠檬酸钠缓冲液作为流动相为最佳条件。分析时间缩短为１５ｍｉｎ。     

反相高效液相色谱法安培检测器快速测定人血清中维生素C含量

维生素C(下称VC)是维持人体健康的重要维生素之一。它广泛参与机体的氧化、还原和羟化等代谢过程,对维持机体正常生理功能具有重要作用。VC缺乏可导致坏血病和机体抗病能力降低。通过血清VC浓度测定,对坏血病的诊断和治疗,对于及时纠正VC缺乏及评价某些生理、病理条件下的机体状况具有重要的临床意义。VC的测定有紫外比色法,有HPLC-UV检测食品和体液中VC含量,但灵敏度低。还有反相离子对色谱法,而离子对试剂价格昂贵。本法具有简便、快速、灵敏等特点。     

高效液相色谱-质谱/质谱测定血浆中格列苯脲

本文建立了人血浆中格列苯脲的高效液相色谱-质谱/质谱(HPLC-MS/MS)分析方法。血浆中格列苯脲测定的线性范围是1~300 ng/mL;高、中、低三个浓度分析测定的精密度(RSD)<15%;格列苯脲和格列齐特(内标)绝对回收率均>80%。本方法灵敏、准确,重现性好,用于血药浓度的测定获得满意结果。     

Determination of tetraiodothyronine in serum by HPLC and electrochemical detection

Tetraiodo-L -thyronine (T4) in human serum was determined by HPLC using a nonphysiological internal standard. For sample preparation, a cation exchange resin, RP-chromatography on C-18 or phenylphase, and electrochemical detection (Metrohm 656 or BAS-LC 4 A) were employed. The mobile phase (0.8 ml/min) was 10 mM H₃PO₄/CH₃OH (40/60 v/v) or 10 mM H₃PO₄/CH₃CN (70/30 v/v, 1.5 ml/min), the voltage applied 800 mV. The coefficient of variation (day to day) was 6.8% (N = 40); concentrations of T4 found were 11 to 20% lower than those obtained by two different commercially available immunoassays.     

Pre-column derivatization of rofecoxib for determination in serum by HPLC

An HPLC method for determination of rofecoxib in human serum is presented. The method is based on pre-column derivatization of analyte to a phenanthrene derivative of the drug. Rofecoxib and the internal standard were extracted from serum using liquid–liquid extraction. Upon exposure to UV light, the drug was found to undergo a photocyclization reaction, giving a species with high absorbance. Validation of the method has been studied in the concentration range 10–500 ng ml^–1.     

液相色谱法测定地质样品中的芳香化合物

发展了用液相色谱法检测地质样品中芳香化合物的方法。对观察到的色谱峰进行了定性分析，了该法对油气地球化学勘探的意义。     

Determination of glibenclamide in human serum by HPLC

The antidiabetic drug glibenclamide can be reliably quantitated in human serum with high performance liquid chromatography. The serum is buffered and extracted with toluene. The organic solvent is evaporated, the residue dissolved in the mobile phase and an aliquot sampled automatically and chromatographed. UV-detection at 229 m allows a lower limit of quantitation of 5 ng/ml. Precise handling of exact volumes facilitates external calibration. Statistical data for imprecision and inaccuracy are given and illustrate reliable quantification. Application of the method to experimental and clinical pharmacokinetic studies with specific problems is illustrated.     

Mechanism of interaction of hypoglycemic agents glimepiride and glipizide with human serum albumin

The mechanism of interaction of hypoglycemic drugs, glimepiride and glipizide with human serum albumin (HSA) has been studied using fluorescence spectroscopy. The results are discussed in terms of the binding parameters, thermodynamics of the binding process, nature of forces involved in the interaction, identification of drug binding site on serum albumin and the fluorescence quenching mechanism involved. The association constants were of the order of 10⁵ and glipizide was found to have much higher affinity for HSA than glimepiride at all temperatures. Thermodynamic parameters for the binding suggested that hydrophobic interactions are primarily involved in the binding of these drugs to HSA. However, glimepiride and glipizide appear to cause temperature-dependent conformational changes in the albumin molecule and, therefore, the nature of interaction varied with temperature. Glimepiride and glipizide bind to both site I and site II on HSA, but the primary interaction occurs at site II. The binding region in site II is different for the two drugs. Stern-Volmer analysis of quenching data indicated that tryptophan residues of HSA are not fully accessible to the drugs and a predominantly dynamic quenching mechanism is involved in the binding. Results can provide useful insight into prediction of competitive displacement of these drugs by other co-administered drugs and excipients, resulting in serious fluctuations of the blood glucose levels in diabetic patients.      

反相高效液相色谱法测定血浆中同型半胱氨酸的含量

本文建立了在等度洗脱下高效液相色谱法(HPLC)测定血清中同型半胱氨酸含量的方法。血浆同型半胱氨酸经巯基乙醇还原后用H2O2氧化巯基,与邻苯二甲醛(OPA)衍生,经C18色谱柱在45℃分离,荧光检测。方法简便、快速,线性范围为0.685～148.0μmol·L-1,r=0.9998;方法回收率为96.4%～100.1%。日内相对标准偏差小于5%,日间相对标准偏差小于6%。     

液相色谱法测定饮料中咖啡因实验的改造与探讨

对液相色谱法测定饮料中的咖啡因实验进行了改造与拓展,增加去除色素和糖类等干扰物的步骤,以甲酸代替磷酸二氢钾缓冲溶液对流动相进行改进,增强了实验的可操作性和综合性,提高了检测结果的准确性,加深了学生对食品分析中液相色谱法应用的认识,提高了学生利用所学知识综合解决问题的能力。     

Determination of Metoclopramide in Serum by HPLC Assay and Its Application to Pharmacokinetic Study in Rat

Abstract

A simple, sensitive, and reproducible HPLC method has been developed for the determination of metoclopramide employing reversed phase high performance liquid chromatography with UV detection at 270 nm. The separation was performed on a Novapak C₁₈, 4 μm (3.9 × 150 mm) column. Acetonitrile (18%) in 0.02 M ammonium acetate containing 0.1% triethylamine was used as the mobile phase and the run time was 7 min. Tramadol was used as the internal standard. The mean retention times of metoclopramide and tramadol were 3.4 and 4.6 min, respectively. Linear response (r > 0.997) was observed over the range of 0.025–5 μg/ml of metoclopramide. There was no significant difference (p < 0.05) between inter- and intra-day studies for metoclopramide. The mean relative standard deviations (RSD%) of the results of within-day precision and accuracy of the drug were < 10%. The applicability of the assay was demonstrated in measuring metoclopramide pharmacokinetics in rats. The elimination half-life was 2.09 ± 0.39 h with an apparent clearance of 2.45 ± 0.70 (L/h)/kg in rat.