反相高效液相色谱梯度洗脱同时测定复方茶碱片中7组分的含量

建立了一种灵敏、快速的反相高效液相色谱梯度洗脱方法，用于同时测定复方茶碱片中7组分的含量。采用YWG C18柱，以甲醇-磷酸二氢钠为流动相，用二极管阵列检测器，检测波长为214nm,15min即可将7种组分分离测定。该方法快速淮确，线性范围广，用于实际样品的测定，结果满意。     

反相高效液相色谱法同时测定茶叶中六种儿茶素组分的研究

采用反相高效液相色谱法同时测定茶叶中L (+) 表儿茶素(L EC),L (-) 表儿茶素没食子酸酯(L ECG),L (-) 表没食子儿茶素没食子酸酯(L EGCG),L (-) 表没食子儿茶素(L EGC),(+) 没食子儿茶素没食子酸酯(GCG),DL 儿茶素(DL C)六种儿茶素组分,以乙醇∶乙酸∶水=14.5∶1.0∶84.5(体积比)为流动相(1.0ml·min-1),C18柱,UV检测器(278nm)。六种儿茶素组分的相对标准偏差分别为0.67%,0.45%,0.24%,0.56%,3.11%,4 41%,回收率分别为95.2%,98.2%,101.3%,97.0%,98.3%,97.5%。该法采用乙醇、乙酸等无毒溶剂作流动相,回收率高,用于实际样品测定,结果满意。     

反相高效液相色谱同时测定对乙酰氨基酚等5组分的含量

1　引　　言在速效感冒液中同时存在着 5种成分 :对乙酰氨基酚、扑尔敏、咖啡因、愈创木酚甘油醚和对氨基酚。其中的对氨基酚是对乙酰氨基酚的降解产物 ,对人体有一定的副作用。因此 ,如何控制、降解对氨基酚的含量 ,一直是研究的重要课题之一 ,但尚未见到同时测定上述 5组分含量的报道。本文建立了运用反相高效液相色谱法同时测定感冒液中 5组分含量的方法。实验结果表明 :5组分在一定浓度范围内均呈良好的线性关系 ,回收率在 96 .31%～ 10 2 .2 3%之间。该方法操作简便、快速 ,结果准确。2　实验部分2 .1　仪器与试剂　Ｗａｔｅｒｓ 5 10…     

反相高效液相色谱法同时测定三七药材中4种皂苷的含量

建立了以0．02％磷酸-乙腈为流动相，梯度洗脱反相高效液相色谱同时测定中药材三七中三七皂苷R1、人参皂苷Rg1、Rb1和Rd 4种皂苷的新方法。R1、Rg1、Rb1和Rd 4种皂苷的加样回收率分别为89．54％、90．08％、82．82％与84．46％；线性范围分别为0．244-6．110、0．820-20．510、0．396-9．890与0．260-6．500μg。测定了不同规格、部位和来源的三七药材里的4种皂苷R1、Rg1、Rb1和Rd。方法准确可靠，结果稳定，重现性好，可用于三七及其制剂的质控。     

反相高效液相色谱法同时测定食品中甜蜜素、糖精钠和苯甲酸钠

采用反相高效液相色谱法快速分离和测定食品中甜蜜素、糖精钠和苯甲酸钠，在ODS柱上，以30％甲醇和70％(含离子对试剂)水溶液为流动相进行分离；分别考察了流动相中不同的甲醇配比和不同浓度的离子对试剂对分离和保留行为的影响。检测波长为205nm。采用外标法定量。该方法精密度高、准确度好，样品处理简单，实用于常规质量监测。     

反相高效液相色谱法同时测定水样中辛硫磷和氯菊酯

采用AgilentSBC8(5μm,4.6mmi.d.×150mm)色谱柱,以V(乙腈)∶V(水)=70∶30为流动相进行分离,二极管阵列检测器(PDA)在210nm波长处检测,建立了反相高效液相色谱法同时测定辛硫磷和氯菊酯的分析方法。辛硫磷和氯菊酯的线性范围分别为0.1～10μg mL和0.02～10μg mL,检出限分别为0 05和0.01μg mL,实际水样的加标回收率为90.3%和95.3%,相对标准偏差为1.3%和3.2%(n=7)。     

反相高效液相色谱法同时测定发酵液中的阿魏酸、香草酸和香草醛

香草醛(Vanillin,Vin)是食品、饮料等工业应用最广泛的香料之一,还可作为保鲜剂及医药等工业的原材料。香草醛目前主要由化学方法制备,但化学合成制得的香草醛不属于天然香料。天然香草醛可以从香子兰的花荚中提取,得到的香草醛量少且价高。根据美国和欧盟的规定,合成香草醛在食品添加剂中的使用会引起法律方面的争议,由此促进了     

反相高效液相色谱法测定复方化学消毒剂中苯扎氯铵

苯扎氯铵又名洁尔灭(BAC),是具有杀菌作用的季铵盐类阳离子表面活性剂,主要由3种正烷烃图1 BAC分子结构式F ig·1 Structure of BAC基(n-C12H25、n-C14H29和n-C16H33)取代的二甲基苄基氯化铵的同系物组成,结构式如图1。3种同系物的杀菌特性不同:n-C12H25-C9H13NC l是最有效的酵     

鱼子酱中的合成色素反相高效液相色谱法同时测定

建立了反相高效液相色谱法同时测定鱼子酱中的柠檬黄、日落黄、偶氮玉红、苋菜红、胭脂红、赤藓红、红色2G和诱惑红8种合成色素的方法.样品中的合成色素经甲醇-4 mol/L尿素溶液(体积比1 ∶ 1)提取,固相萃取聚酰胺柱净化后,采用XDB-C18色谱柱(4.6 mm×250 mm×5 μm),以甲醇-乙腈(体积比1 ∶ 1)和0.01 mol/L乙酸钠溶液为流动相,在最佳梯度洗脱条件下,8种合成色素在17 min内实现分离.各色素在0.05 ～50 mg/L质量浓度范围内具有良好的线性关系.将该法用于实际样品的检测,8种合成色素的加标回收率为89% ～110%,相对标准偏差为1.4% ～4.7%.方法简单、高效,可用于鱼子酱中合成色素的日常监督检测.     

反相离子对高效液相色谱法测定硫酸软骨素

以四甲基氯化铵作为离子对试剂，采用乙腈-2.28mmol/L四甲基氯化铵水溶液（5:95)作为流动相，选用C18色谱柱分离硫酸软骨素和杂质，建立了测定硫酸软骨素含量的反相离子对高效液相色谱方法。该方法的线性范围为0.4-8.0μg，回收率为98.8%-100.3%，相对标准偏差为0.17%-0.53%。该方法的精密度和准确度较高。     

反相高效液相色谱法同时分析三聚氰酸和三聚氰胺

建立了同时分析三聚氰酸和三聚氰胺的反相高效液相色谱法．发现三聚氰酸和三聚氰胺在C8柱上的保留比在C18柱上明显要强,这一结果表明三聚氰酸和三聚氰胺在反相固定相中的保留并非以通常的疏水分配作用为主导．方法的紫外检测下限为0．034～0．31mg／L,标准曲线线性范围为0．5-100mg／L．方法不经特殊的样品前处理即可用于奶粉和游泳池水等样品中三聚氰酸和三聚氰胺的同时分析．     

高效液相色谱法同时测定多维元素片中9种水溶性维生素

采用更简便的流动相体系,建立了高效液相色谱法同时测定多维元素片中9种水溶性维生素的快速分析方法。以酸水解与离心的方法处理样品,用C8柱分离,流动相A为0.1%三氟乙酸的水溶液,B为甲醇,梯度洗脱,二极管阵列检测器(DAD)检测。28min内实现了9种水溶性维生素的同时分离测定。各维生素线性关系、精密度、回收率均良好。并使用美国国家标准技术研究院(NIST)的SRM3280多维元素片标准物质对方法进行了确认,运用此法测定了市售多维元素片中的水溶性维生素含量。该法可作为维生素片剂中水溶性维生素分离测定的质控方法。     

Simultaneous quantitative determination of amiloride hydrochloride and hydrochlorothiazide in tablets by high-performance liquid chromatography

Summary A procedure for the simultaneous quantitative determination of amiloride hydrochloride and hydrochlorothiazide by high-performance liquid chromatography is proposed. A reversed-phase LiChrosorb C8 stationary phase is used. The eluent consisted of an acetonitrile/0.1M phosphate buffer pH3 (15∶85) mixture, containing 50mM propylamine hydrochloride. In this system amiloride hydrochloride, a basic drug, eluted with a acceptable asymmetry factor (Asf=2.1). A simple extraction procedure with methanol is used. Relative standard deviations of 0.87% and 1.6% were obtained for amiloride hydrochloride and hydrochlorothiazide respectively. Chlorothiazide, a thiazide diuretic, is a suitable internal standard. Furthermore the method is also specific for other thiazide diuretics, potassium-sparing diuretics and loop diuretics and for the respective hydrolysis productes of both drugs. Analysis time is reduced to a minimum; the chromatographic separation is complete within 6 minutes.     

反相高效液相色谱法同时检测食物中毒样品中的敌鼠钠盐、杀鼠醚和杀鼠灵

建立了反相高效液相色谱-二极管阵列检测器同时快速检测食物中毒样品中的敌鼠钠盐、杀鼠醚和杀鼠灵的分析方法。固体样品用乙腈提取,液体样品用乙酸乙酯提取。以V(乙腈)∶V(0.010 mol/L乙酸铵)=57∶43(pH 4.50)为流动相,经C18色谱柱分离,二极管阵列检测器分别在波长286和306 nm处同时检测,在8 min内即可完成色谱分析。敌鼠钠盐、杀鼠醚和杀鼠灵在0.05~20.0μg/mL范围内与其色谱峰面积呈良好的线性关系,方法的检出限固体样品为0.015μg/g,液体样品为0.003μg/mL,样品加标平均回收率在85.0%~109.2%之间,相对标准偏差为1.0%~9.6%。     

Simultaneous separation of nonionic surfactants and polyethylene glycols by reversed phase high performance liquid chromatography

Summary The simultaneous separation of polyethylene glycol and its derivatives such as the lauryl alcohol and lauric acid ethoxylate oligomers was carried out by reversed phase high performance liquid chromatography. Branched fluorinated silica gel columns combined with evaporative light scattering detection were used for the characterization of nonionic surfactants. Lauryl alcohol ethoxylate oligomers were separated at 10°C with an isocratic eluent according to ethoxylate number and the retention time of the oligomers decreases with increasing ethoxylate number. The Van’t Hoff plots of retention factor of lauryl alcohol ethoxylate gave a complex cure, which is anomalous behavior for reversed phase high performance liquid chromatography. The anomalous Van’t Hoff plots were explained by a partial conformational change from polar to less polar conformers with increasing temperature. The most significant features for the analysis of the lauryl alcohol ethoxylate were the use of acetonitrile as mobile phase and operating temperature. The polyethylene glycol was separated according to ethoxylate number and the retention time of oligomers increased with increasing ethoxylate number. The Van’t Hoff plots of retention factor of polyethylene glycol had negative slopes. It was presumed that the polar conformation of the ethylene oxide chain decreased with increasing temperature. The lauryl alcohol ethoxylate and polyethylene glycol were separated simultaneously in gradient elution as a result of the conformational change of the ethylene oxide chain. As a practical example, lauric acid ethoxylate simultaneously separated into free polyethylene glycol, ethoxylate monolaurate and ethoxylate dilaurate in gradient elution.     

反相高效液相色谱法快速测定大麦籽粒中13种酚酸类化合物

建立了快速测定大麦籽粒中13种酚酸类化合物(没食子酸、原儿茶酸、绿原酸、对羟基苯甲酸、咖啡酸、香草酸、丁香酸、间羟基苯甲酸、对香豆酸、阿魏酸、藜芦酸、邻香豆酸和水杨酸)的反相高效液相色谱方法.采用SUPELCOAscentis(@) C18色谱柱(150 mm×4.6 mm,5μm)分离,流动相为甲醇-0.1％甲酸水溶...     

高效液相色谱法同时测定厚朴温中胶囊中的7种有效成分

建立了同时测定厚朴温中胶囊中山姜素、甘草酸、和厚朴酚、小豆蔻明、木香烃内酯、去氢木香内酯及厚朴酚含量的反相高效液相色谱法。固定相为Scienhome C18柱(250 mm×4.6 mm,5 μm),流动相为甲醇-乙腈-0.06%磷酸溶液(体积比为38∶27∶35),流速为1.0 mL/min,柱温为30 ℃,检测波长为235 nm。在上述条件下,山姜素、甘草酸、和厚朴酚、小豆蔻明、木香烃内酯、去氢木香内酯及厚朴酚的质量浓度分别在0.885～17.7,107～2140,8.85～17.7,1.035～20.7,4.85～97,5.9～118和17.5～350 mg/L时与色谱峰面积之间的线性关系良好;回收率分别为96.9%～101.1%,96.0%～100.5%,100.3%～100.8%,97.7%～101.4%,100.4%～102.3%,96.0%～102.3%和96.2%～100.6%。该方法简便、快速、准确,可用于厚朴温中胶囊的质量控制。     

Anomalous properties of flavonoids in reversed phase high performance liquid chromatography

It is shown through reversed phase high performance liquid chromatography that a characteristic feature of such abundant natural flavonoids as flavon-3-ols is an anomalously strong antibate dependence of their retention indices (RI) on the organic solvent concentration (C) in the eluent, dRI/dC < 0. In order to interpret this anomaly, the specific optical rotation values [α]_D²⁰ of natural (+)-(2R,3R)-dihydroquercetin in different solvents are compared, confirming the reverse formation of hydrated flavonoids in aqueous solutions.     

Chromatographic performance of deuterated solvents in reversed phase micro high performance liquid chromatography

The chromatographic performance of the deuterated solvents, CD₃OD and D₂O, has been investigated in reversed-phase micro high performance liquid chromatography. The chromatographic performance of CD₃OD is only slightly superior to that of CH₃OH. However, the performance of D₂ is significantly superior to that of H₂O, separation of aromatics being improved by about 30%. D₂ is a particularly powerful solvent for the separation iof deuterated and non-deuterated compounds.