高效液相色谱法测定旋复花中槲皮素的含量

建立了高效液相色谱法测定旋复花中槲皮素含量的方法。该方法采用ZORBAX eclipse XDB C8色谱柱(150mm×4.6mm,5μm),流动相为甲醇-磷酸(0.2%),体积比为65∶35,检测波长为370nm。实验结果表明,槲皮素在5.0～100.0μg/mL范围内与峰面积线性关系良好(r=0.9999),测定结果的相对标准偏差为1.2%(n=6),平均加标回收率为97.1%。该法可用于测定旋复花中槲皮素的含量。     

高效液相色谱法测定电解液中尿素的含量

建立了高效液相色谱法测定电解液中微量尿素的方法,分别研究了测试过程中流动相配比、流速以及干扰物质(OH~-,NO_2~-,HCOO~-,CH_3COO~-,NH_3,CH_3OH,CH_3CH_2OH等)对尿素检测的影响。通过改变流动相不同配比、流速,进而调节尿素的出峰时间、面积,发现当流动相乙腈:水配比为40:60(V/V),流速为0.15 m L/min时,尿素出峰面积最大,且干扰物质与尿素的HPLC峰分离明显对尿素的检测无明显干扰。在最佳HPLC检测条件下,HPLC能够完成0～40 mg/L范围内的低浓度尿素含量检测。     

高效液相色谱法测定去氢表雄酮的含量

建立了测定青春源胶囊中去氢表雄酮含量的高效液相色谱法,固定相为shim-pack CLC-ODS柱(150mm×6.0mmi. d.),流动相为乙腈+水(40+60),检测波长为215nm。去氢表雄酮的线性响应范围为66～300μg/mL,平均回收率为99.0％,相对标准偏差为1.5％。     

高效液相色谱法测定烟叶中茄尼醇的含量

选用Ｚｏｒｂａｘ－ＳＩＬ（２５０ｍｍ×４．６ｍｍｉ．ｄ．）色谱柱,以正己烷－异丙醚－乙酸乙酯（６３１）混合溶剂作流动相,用示差折光检测器测定了烟叶提取物中茄尼醇的含量,结果表明所用方法具有良好的分离效果和回收率,在０．２～４μｇ之间有良好的线性关系,可用于烟叶或茄尼醇产品中茄尼醇含量的测定。     

高效液相色谱法测定阿弗菌素含量

采用反相高效液相色谱法测定了阿弗菌素片中阿弗菌素的含量。色谱柱为ＴＳＫ－ＧＥＬＣ１８,流动相为甲醇∶水（７５∶２５）,检测波长２４５ｎｍ,可得到满意的分离效果。     

高效液相色谱法测定血浆中阿魏酸的含量

建立了一种快速、稳定的高效液相色谱-二极管阵列检测法(HPLC-DAD),用于测定健康人口服阿魏酸钠片后,血浆中阿魏酸的含量。该方法采用DIONEX C18色谱柱(250×4.6mm i.d.,5μm),流动相为甲醇-磷酸缓冲溶液(0.1%),梯度洗脱,检测波长为322nm。结果显示:人体血浆中的阿魏酸提取回收率大于60%。阿魏酸的含量在0.025～8.0μg/mL范围内线性良好,相关系数r=0.9994。方法检出限(S/N=3)为0.025μg/mL。日内相对标准偏差(RSD)小于1.02%,日间RSD小于2.1%。该法可用于人体血浆中阿魏酸的药代动力学研究。     

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叔丁基对苯二酚的含量

建立了HPLC测定叔丁基对苯二酚含量的方法:色谱柱:Shim-pack VpODS(150 mmt×4.6 mm,5μm)接C18保护柱(20 mm×4.6 mm,5μm);以V(乙腈):V(水)=32:68(含1%乙酸)作为流动相;流速:0.8 mL/min;检测波长:290 mm;柱温:25℃.结果表明TBHQ质量浓度在2×10-4～1.0 mg/mL范围内与峰面积线性关系良好r≥0.9999,最低检测限为4 ng,并建立了回收率及日内和日见精密度实验.     

高效液相色谱法测定磷酸三甲苯酯中游离甲酚的含量

采用高效液相色谱法测定磷酸三甲苯酯中游离甲酚的含量.利用高效液相色谱外标法对试样进行分离、检测,获得最佳色谱条件.结果表明,最佳色谱条件：C18色谱柱（250 mm×4.6 mm×5μm）,流动相为甲醇∶水（体积比为8∶2）,流速1.0 mL/min,紫外检测器,检测波长280 nm,柱温35℃,等度洗脱,进样量10μL.方法的加标回收率为95.9%～98.9%,相对标准偏差为1.02%～2.55%,具有操作简便、快捷、准确度高的特点.     

高效液相色谱法测定保健食品中大豆异黄酮含量

建立了高效液相色谱法(HPLC)测定保健食品中大豆异黄酮含量的方法,运用二极管阵列检测器(PDA)建立了4种大豆异黄酮D、G、De、Ge的光谱库,测定了D、G、Ge与De响应值之比.采用PDA检测,C18反相柱,以甲醇∶水∶醋酸(HAC)=55∶45∶1(V/V/V)为流动相测定了同一批保健食品美龄营养片中4种大豆异黄酮D、G、De、Ge的含量分别为2.24%、10.82%0、.085%、0.027%,变异系数小于5%,回收率为92.51%～99.30%.该方法快速,精密度及准确度在允许范围内,可作为保健食品中D,G,De,Ge的同时测定方法.     

High Performance Liquid Chromatographic Determination of Triazolam in Human Serum

Abstract

A high performance liquid chromatographic method which utilizes UV-detection has been developed for the sensitive and specific determination of triazolam in human serum. Using 8-chloro-6-phenyl-l-ethoxymethyl-4H-s-triazolo[4, 3-a][1, 4]benzodiazepine as an internal standard, serum samples were buffered with 2 ml of 4M NaOH and extracted twice with 5 ml aliquots of toluene. The combined toluene extracts were evaporated to dryness and the residue dissolved in the chromatographic mobile phase. The samples were chromatography on a microparticulate reverse-phase column using a 0.06M acetic acid:acetonitrile (61:39) mobile phase. Known metabolites of triazolam did not interfere in the analysis. A linear relationship between peak height ratios and concentrations was observed, with the lower limit of detection being approximately 1 ng of triazolam. The utility of the method was demonstrated by administering therapeutic doses of the drug to human volunteers and monitoring serum triazolam concentrations as a function of time.     

High Performance Liquid Chromatographic Determination of Nordihydroguaiaretic Acid

Abstract

A high performance liquid chromatography (HPLC) method was developed for the detection and quantitation of nordihydroguaiaretic acid (NDGA). Very low concentrations of NDGA in various extracts are detectable, thus making the method more sensitive than other previously reported analytical techniques. NDGA was extracted from leaves of Larrea divaricata as well as from rodent food containing NDGA. Since rats are fed NDGA in studies that examine the development of renal cystic disease, we modified extraction procedures to permit isolation of NDGA from tissue and serum samples.     

High Performance Liquid Chromatographic Determination of Flurbiprofen in Pharmaceutical Dosage Forms

Abstract

A rapid, specific and reliable high performance liquid chromatographic assay of flurbiprofen in dosage forms has been developed. Reversed-phase chromatography was conducted using a mobile phase of 0.05 M ammonium acetate and acetonitrile, (40% v/v) PH 5.2 and detection at λ 247 nm. The recovery and coefficient of variation from six placebo tablets spiked with 100 mg of flurbiprofen were 100.1% and 0.4% respectively. Replicate regression analyses of three standard plots in the concentration range 0.5 - 9 mcg/ml obtained on three different days gave a correlation coefficient (0.99996) and the coefficient of variation of the slopes 0.159%. The assay was precise within day and between days as indicated by ANOVA test. It is suggested that the proposed HPLC method should be used for routine quality control and dosage form assay of flurbiprofen.     

High Performance Liquid Chromatographic Determination of Amiodarone in Plasma and Tissues

Abstract

A simple and rapid high-performance liquid chromatographic (HPLC) method for the determination of amiodarone (AD) in plasma and tissues was developed. The method involved deproteinization of plasma or homogenized tissue with acetonitrile containing an internal standard (N-Cetylpyridinium chloride) followed by reversed phase chromatography using μ bondapack C₁₈ column (10μm) with a mobile phase consisting of acetonitrile - methanol - sodium dihydrogen phosphate buffer (70:10:20%, v/v), the pH adjusted to 4.0 and pumped at flow rate of 1.0 ml/min. The column effluent was monitored at 242 nm. A linear relationship was obtained between peak height ratios (drug to internal standard) versus drug levels over the concentration range of 50–750 ng/ml. The detection limit of AD in plasma and tissues by this method was 20 ng/ml.     

Rapid High Performance Liquid Chromatographic Determination of Ampicillin in Human Urine

Abstract

A rapid, sensitive and specific HPLC assay for the determination of ampicillin in human urine is developed.

Ampicillin was directly measured in human urine at 225 nm using a reversed phase column (Synchropack RP-P) and a mobile phase composed of (1:9 methanol-sodium acetate solution, 0.01 M, pH 4). The analysis required no longer than 10 min. Linear correlation between the peak height ratio of ampicillin to cefoxitin sodium (internal standard) and ampicillin concentration in urine over the range 10–100 μg ml^?1 was obtained. The developed method proved to be advantageous as it monitors ampicillin level in urine. Moreover, the urinary excretion of ampicillin in human subjects after an oral administration of 500 mg ampicillin capsules was established using the proposed method.     

Ion-Exchange High Performance Liquid Chromatographic Determination of Selenomethionine by Reaction with Cyanogen Bromide

Abstract

A sensitive and simple ion-exchange HPLC procedure is described for the separation and analyses of selenomethionine from coeluting naturally occurring amino acids. Cyanogen bromide selectively reacts with selenomethionine in the absence of stannous chloride to form an unknown reaction product, formation of which is quantitative. A calibration curve is obtained over a linear dynamic range of 30 nmoles to 500 nmoles of selenomethionine.     

高效液相色谱法测定阿卡波糖水解产物中的Valienamine含量

1引言Valienam ine((1S,2S,3S,4R)-1-氨基-5-(羟甲基)环己-5-烯-2,3,4-三元醇),分子式C7H13NO4,是一种由假单孢菌降解井冈霉素获得的假氨基糖,可通过阿卡波糖或井冈霉素水解来制备。它不仅能够有效治疗糖尿病及高血糖所导致的肥胖症,而且还能治疗艾滋病等其它疾病,所以对其的研究和开发已引起全世界生物医学领域的广泛关注。Valienam ine的检测方法主要有糖化酶检测法、紫外分光光度法、质谱法和薄层扫描法等,这些方法都存在难于定量或定量不准确、检测不方便的缺陷。有人用p-硝基氟苯与Valienam ine反应衍生生成N-p-硝基苯-Valienam …     

高效液相色谱法测定西红柿中克线磷残留量

高效液相色谱法测定西红柿中克线磷残留量包宏,夏民洲,胡兹苓（南京林业大学南京２１００３７）１前言克线磷（ｆｅｎａｍｉｐｈｏｓ）,商品名Ｎｅｍａｃｕｒ,是防治作物根结、孢囊与自由线虫的杀线虫农药￣［１］。对它的残留分析,有气相色谱法和薄层色谱法等￣［２...     

测定玻璃体和房水中维拉帕米含量的高效液相色谱法

研究了用ＨＰＬＣ 测定兔眼玻璃体和房水中维拉帕米含量的方法。用丙咪嗪为内标， 采用Ｓｐｈｅｒｉｃａｌ Ｃ１８色谱柱分离， 以甲醇－ ０ ．０４ ｍｏｌ／Ｌ 醋酸铵－ 乙腈－ 二乙胺（ 体积比１ ∶１ ∶０ ．５ ∶０ ．０２） 为流动相， 检测波长为２７８ｎｍ 。样品用正己烷－ 异丁醇提取后进样， 分析速度快。 样品及内标的保留时间分别为４ ．６３ ｍｉｎ 及９ ．２３ ｍｉｎ ； 线性范围为２ ．５ ～１００ ｍｇ／Ｌ， 相关系数ｒ 为０ ．９９９ ７ 。方法的回收率为１００ ．３ ％ （ ｎ ＝ ５） ，ＲＳＤ 为３ ．６３％ ， 日内ＲＳＤ 为０ ．５ ％ ～３ ．６１ ％ ， 日间ＲＳＤ 为３ ．７５ ％ ～４ ．８０ ％ ， 最低检测质量浓度为０．２５ ｍｇ／ Ｌ。 应用该法测定了创伤家兔玻璃体和房水中维拉帕米浓度的变化。     

Specific and Sensitive High Performance Liquid Chromatographic Determination of Alprazolam or Triazolam

Abstract

A specific and highly sensitive liquid chromatographic procedure has been developed for the rapid determination of intact alprazolam or triazolam in dog serum, using these structurally similar triazolobenzodiazepines as mutual internal standards. The procedure consists of (1) extracting one ml of alkali buffered serum with toluene, (2) evaporating an aliquot of the toluene to dryness, and (3) quantitating the redissolved residue by HPLC using ultraviolet detection (221 nm). Samples were chromatographed on a microparticulate reverse phase column using a mobile phase composed of acetonitrile: isopropanol: water (94:5:1) and a flow rate of 0.75 ml/min. Metabolites of alprazolam and triazolam did not interfere in the assay. The lower limit of detection was approximately 1 ng/ml of serum extracted. The utility of the analytical methodology for the determination of alprazolam or triazolam in pharmacokinetic studies in the dog was demonstrated.