Sensitive and rapid LC-ESI-MS method for the determination of trimetazidine in human plasma

A sensitive method, based on liquid chromatography-electrospray ionisation-mass spectrometry (LC-ESI-MS), was developed for the determination of trimetazidine in human plasma. Buflomedil was used as the internal standard (IS). Plasma samples were extracted with a mixture of cyclohexane-diethyl ether (1:1, v/v) and the analytes were chromatographically separated on a phenomenex Luna 5 mu C18 (2) 100A HPLC column with a mobile phase of 10 mM ammonium acetate buffer solution containing 0.1% acetic acid-methanol (45:55, v/v). The electrospray ionization was employed in a single quadrupole mass spectrometer for the analytical determination. The lower limit of quantification (LLOQ) was 0.5 ng/ml for trimetazidine and the measuring ranges were from 0.5 to 200 ng/ml. The intra- and inter-run standard deviation was less than 4.1% and 7.8%, respectively. The method was successfully applied to study the pharmacokinetics of trimetazidine in healthy Chinese volunteers.     

LC-MS/MS快速测定人血浆中氯沙坦浓度及其生物等效性研究

目的建立人血浆中氯沙坦LC-MS/MS测定方法,计算氯沙坦人体药动学参数并评价两制剂生物等效性。方法采用单剂量双周期交叉试验设计,完成试验的23例受试者空腹口服受试或参比制剂氯沙坦钾片100 mg后,用甲醇一步沉淀血浆蛋白,并用LC-MS/MS法测定人血浆中氯沙坦浓度。用DAS 3.2.3软件计算氯沙坦人体药动学参数,并评价两制剂生物等效性。结果服用受试和参比制剂后,血浆中氯沙坦的Cmax分别为(697.3±301.7)和(674.1±350.5)ng/m L,AUC0-12 h分别为(994±240)和(1 005±287)ng·h/m L,tmax分别为(1.23±0.38)和(1.37±0.75)h,t1/2分别为(2.04±0.28)和(2.00±0.40)h,生物利用度为102.4%±21.1%。结论建立的分析测试方法灵敏、简便、准确,受试制剂与参比制剂生物等效。     

HPLC-MS法测定人血浆中溴己新浓度及生物等效性研究

目的:建立人血浆中溴己新的高效液相色谱-质谱测定方法.研究受试制剂克洛己新片中溴己新在人体内的药代动力学,评价其相对生物利用度和生物等效性.方法:20 名健康男性受试者随机分成2组,采用自身对照交叉给药的方式,分别单剂量口服受试或参比制剂,剂量均为溴己新 16 mg (相当于盐酸溴己新 17.5 mg )/头孢克洛 500 mg ,采用高效液相色谱-质谱法测定血药浓度.结果:志愿者口服受试和参比制剂后,溴己新的药动学参数如下:Cmax分别为(34.30 ± 7.02)ngmL-1和(35.06 ± 8.39)ngmL-1,tmax分别为(1.4 ± 0.6) h 和(1.0 ± 0.5)h,t1/2分别为(5.75 ± 0.82) h和(6.12 ± 0.62)h,CL分别为(123.9 ± 13.3)Lh-1和(129.2 ± 16.4)Lh-1 ,AUC0-24分别为(125.2 ± 16.1)nghmL-1和(119.8 ± 16.1)nghmL-1;溴己新的相对生物利用度为(106.0 ± 15.3)%.结论:试验建立的分析方法准确、灵敏、快速,统计结果表明受试制剂与参比制剂中溴己新生物等效.     

HPLC-MS法测定人血浆中酮康唑浓度及其生物等效性研究

目的:建立人血浆中酮康唑的高效液相色谱-质谱测定方法.研究受试制剂酮康唑片在人体内的药代动力学特征,评价其相对生物利用度和生物等效性.方法:20 名男性健康受试者随机分成2组,进行双交叉试验,受试及参比制剂剂量均为200 mg.采用高效液相色谱-质谱法测定血药浓度.结果:志愿者口服受试和参比制剂后,酮康唑的药动学参数如下:峰浓度分别为(4.77±1.63)μg·mL-1和(5.09±1.64)μg·mL-1,达峰时间分别为(1.37±0.71) h和(1.19±0.61)h,消除半衰期分别为(1.89±0.80) h和(2.13±0.91)h,平均驻留时间分别为(3.02±0.81) h和(3.04±0.81)h,AUC0-24分别为(13.03±5.65)μg·h·mL-1和(13.99±6.54)μg·h·mL-1;相对生物利用度为95.6%±12.5%.结论:建立的分析方法准确、灵敏、可靠、简便,统计结果表明受试制剂和参比制剂生物等效.     

Method development and validation of montelukast in human plasma by HPLC coupled with ESI-MS/MS: application to a bioequivalence study

A simple, sensitive, and specific LC-ESI–MS/MS method for quantification of Montelukast (MO) in human plasma using Montelukast-d₆ (MOD6) as an internal standard (IS) is discussed here. Chromatographic separation was performed on YMC-pack pro C₁₈, 50 x 4.6 mm, S-3 μm column with an isocratic mobile phase composed of 10mM ammonium formate (pH 4.0):acetonitrile (20:80 v/v), at a flow-rate of 0.8 mL min⁻¹. MO and MOD6 were detected with proton adducts at m/z 586.2→568.2 and 592.3→574.2 in multiple reaction monitoring (MRM) positive mode respectively. MO and MOD6 were extracted using acetonitrile as precipitating agent. The method was validated over a linear concentration range of 1.0–800.0 ng mL⁻¹ with correlation coefficient (r²) ≥ 0.9996. The intraday precision and accuracy were within 1.91–7.10 and 98.32–99.17. The inter-day precision and accuracy were within 3.42–4.41% and 98.14–99.27% for MO. Both analytes were found to be stable throughout three freeze-thawing cycles, bench top, and autosampler stability studies. This method was utilized successfully for the analysis of plasma samples following oral administration of MO (5 mg) in 31 healthy Indian male human volunteers under fasting conditions.     

健康人体内替硝唑片的药代动力学及生物等效性研究

目的研究替硝唑片在健康人体内的相对生物利用度和生物等效性。方法20名健康成年男性志愿者采用随机分组自身交叉试验设计,单剂量口服1.0g替硝唑片后,用高效液相色谱法测定血浆中药物浓度。结果替硝唑在0.208～41.6μg/ml浓度范围内线性良好(r=0.99975),平均回收率98.6%～99.6%,日内和日间标准误(sx)均<10.0%。替硝唑试验制剂和参比制剂的主要药代动力学参数:峰时(Tmax)(:1.5±0.8)和(1.5±1.3)h;峰浓度(Cmax):(20±3)和(21±3)μg/ml;曲线下面积(AUC)0￣60h:(390±55)和(391±48)mg·L-1·h;AUC0￣∞:(427±79)和(424±59)mg·L-1·h;T1/2:(16.6±2.8)和(16.1±1.9)h,以AUC0￣60h计算的受体制剂的相对生物利用度为(100±6)%。结论建立的分析方法准确灵敏,统计学分析表明两种制剂生物等效。     

HPLC-UV determination of metformin in human plasma for application in pharmacokinetics and bioequivalence studies

In this study, a simple, rapid and sensitive HPLC method with UV detection is described for determination of metformin in plasma samples from bioequivalence assays. Sample preparation was accomplished through protein precipitation with acetonitrile and chromatographic separation was performed on a reversed-phase phenyl column at 40 degrees C. Mobile phase consisted of a mixture of phosphate buffer and acetonitrile at flow rate of 1.0 ml/min. Wavelength was set at 236 nm. The method was applied to a bioequivalence study of two drug products containing metformin, and allowed determination of metformin at low concentrations with a higher throughput than previously described methods.     

盐酸曲美他嗪在人体内药物动力学研究分析

目的建立液相色谱—串联质谱法(LC-MS/MS)测定血浆中盐酸曲美他嗪浓度的方法,并研究其药动学行为。方法选取我院2007年2月至2009年2月18名健康成年人作为药物试验对象,均单剂量口服盐酸曲美他嗪40mg后,采用液相色谱—串联质谱法(LC-MS/MS)测定血药浓度,应用AIC法判断房室模型,并利用DAS软件计算药动学参数。结果主要药动学参数:Cmax为(126.11±20.18)μg/L,tmax为(1.78±0.65)h,t1/2Ke为(5.87±0.79)h,Ke为(0.13±0.03)h,V/F为(4.00±0.59)L/kg,CL/F为(0.49±0.09)L.h-1.kg-1,AUC0-24为(1208.79±198.36)μg.h-1.L-1,AUC0-∞为(1304.46±224.13)μg.h-1.L-1。结论该分析方法简单、快速、准确、精密度高,适用于人体中盐酸曲美他嗪浓度的测定。盐酸曲美他嗪的血浆药动学参数与国内外文献报道基本一致。     

RP-HPLC测定拉米夫定的人体血药浓度及生物等效性研究

目的：建立人血浆中拉米夫定的HPLC测定法,研究拉米夫定片在健康中国志愿者体内的药动学特征及相对生物利用度。方法：20名健康男性志愿者采用随机分组、双交叉给药方案,分别单剂量口服0．3g的拉米夫定国产制剂与进口制剂,采用RP—HPLC法测定血药浓度,色谱柱为Kromasil C18柱（250mm×4．6mm ID,5μm）,流动相为甲醇：25mmol／L磷酸二氢钾（含体积分数为1％的三乙胺,pH3．3）（10：90）,流速1mL／min,检测波长UV280nm。应用DAS2．1软件处理数据,计算两组的药代动力学参数及相对生物利用度。结果：拉米夫定在25～7500μg／L内线性良好（r=0．9992）,血浆中低、中、高3种质量浓度（50、500、5000μg／L）的相对回收率在100．09％～103．36％之间,批内RSD≤2．2％,批间RSD≤7．8％。口服0．3g拉米夫定试验制剂（国产）及参比制剂（进口）后的主要药代动学参数如下：Cmax分别为（2835±734）和（2868±726）μg／L;tmax分别为（1．2±0．6）和（1．0±0．8）h;t1／2分别为（2．68±0．32）和（2．58±0．41）h;AUC1-14h分别为（10994±1839）和（10593±1654）μg·L^-1·h;AUC0-∞,分别为（11330±1908）和（10884±1734）μg·L^-1·h。试验制剂（T）的相对生物利用度为（104．80±15．56）％。结论：本法简便、灵敏、准确、稳定,可用于体内药物分析。国产拉米夫定片与进口片剂具有生物等效性。     

多潘立酮片的人体药代动力学和生物等效性研究

建立了HPLC-FLD法测定人体血浆中多潘立酮的浓度.受试者单剂量口服受试片及参比片后,Cmax分别为(24.60±11.60)和(26.82±10.94)ng?mL-1,tmax分别为(0.7±0.4)和(0.7±0.5)h,AUC0～∞分别为(107.2±49.09)和(106.52±44.67)ng/(h?mL).受试片的相对生物利用度为(105.0±32.4)%,两制剂生物等效.     

LC-ESI-MS method for the determination of bisoprolol in human plasma

A sensitive liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) method has been developed and validated for the determination of bisoprolol in human plasma, using metoprolol as internal standard (I.S.). After alkalization with sodium hydroxide, the samples were extracted with ethyl acetate and separated by HPLC on a ZORBAX SB-C18 column with a mobile phase of 10 mM ammonium acetate buffer containing 0.1% formic acid-methanol (32:68, v/v) at a flow rate of 1 ml/min. The chromatographic separation was achieved in less than 5 min. The linearity was established over the concentration range of 0.05-120 ng/ml. The intra- and inter-run standard deviation was less than 3.8 and 7.5%, respectively. The method had been successfully applied to study the relative bioavailability of bisoprolol fumarate tablets in healthy Chinese volunteers. The pharmacokinetic parameters of the reference and test tablets have been compared.     

加替沙星片人体药代动力学及生物等效性研究

目的:在中国健康成年男性志愿者中比较研究国产和进口加替沙星片剂的药代动力学参数,评估两者的生物等效性。方法:24名健康男性志愿者随机自身前后交叉给药,分别单剂口服国产和进口加替沙星片400mg。以HPLC测定血药浓度,应用DAS软件计算两者的药代动力学并考察其生物等效性。结果:受试者分别应用国产片剂(试验制剂)和进口片剂(参比制剂)400mg后,两药药-时曲线均符合二房室模型,主要药代动力学参数:Tmax分别为(0.99±0.41)h和(1.11±0.60)h;Cmax分别为(4.11±0.76)μg/mL和(3.89±0.54)μg/mL;t1/2β分别为(7.75±0.81)h和(7.39±0.92)h;AUC0-36h分别为(29.81±5.70)μg·mL-1·h和(30.77±4.40)μg·mL-1·h;AUC0-∞分别为(30.97±6.01)μg·mL-1·h和(31.85±4.58)μg·mL-1·h;国产片剂对于进口片剂的相对生物利用度F0-36h为(97.63±19.15)%。结论:国产与进口加替沙星片剂为生物等效制剂。     

格列齐特片在健康人体内的药代动力学及生物等效性研究

目的研究格列齐特片在健康人体内的相对生物利用度和生物等效性。方法20名健康成年男性志愿者采用随机分组自身交叉对照试验设计,单剂量口服80mg格列齐特片后,用高效液相色谱法测定血浆中药物浓度。结果格列齐特在0.104～12.48μg/ml浓度范围内线性良好(r=0.99988),平均回收率90.125%～104.6%,日内和日间精密度(RSD)均<10.0%。试验制剂和参比制剂的主要药代动力学参数:峰时(Tmax):(4.4±0.9)和(4.0±0.9)h;峰浓度(Cmax):(4.8±0.6)和(5.3±0.8)μg/ml;曲线下面积(AUC)0￣48h:(86±29)和(88±33)mg·L-1·h-1;AUC0￣∞:(99±45)和(103±58)mg·L-·1h-1;消除半衰期(T1/2):(13±4)和(14±5)h。以AUC0￣48h计算的受试制剂的相对生物利用度为(99±9)%。结论建立的分析方法准确灵敏,统计学分析表明两种制剂生物等效。     

Determination of mianserin in human plasma by high performance liquid chromatography-electrospray ionization mass spectrometry (HPLC-ESI/MS): application to a bioequivalence study in Chinese volunteers

This study aims to develop a standard protocol for the bioequivalence study of mianserin hydrochloride tablets--a tetracyclic antidepressant drug. For this purpose, a rapid, convenient and selective method using high performance liquid chromatography coupled with electrospray ionization mass spectrometry (HPLC-ESI/MS) has been developed and validated to determine mianserin in human plasma. Mianserin and the internal standard (I.S.), cinnarizine were extracted from plasma by N-hexane:dimethylcarbinol (98:2, v/v) after alkalinized with sodium hydroxide. LC separation was performed on a Thermo Hypersil-Hypurity C18 (5 microm, 150 mm x 2.1 mm) with the mobile phase consisting of 10mM ammonium acetate (pH 3.4)-methanol-acetonitrile (35:50:15, v/v/v) at 0.22 ml/min. The retention time of mianserin and cinnarizine was 3.4 and 2.1 min, respectively. Quadrupole MS detection and quantitation was done by monitoring at m/z 265 [M+H]+ for mianserin and m/z 369 [M+H]+ for cinnarizine. The method was validated over the concentration ranges of 1.0-200.0 ng/ml for mianserin. The recovery was 81.3-84.1%, intra- and inter-day precision of the assay at three concentrations were 9.6-11.4% with accuracy of 97.5-101.2% and the lower limit of quantitation (LLOQ) detection was 1.0 ng/ml for mianserin. The stability of compounds was established in a battery of stability studies, i.e., short-term and long-term storage stability as well as freeze-thaw cycles. This method proved to be suitable for the bioequivalence study of mianserin hydrochloride tablets in healthy human male volunteers.     

高效液相色谱串联质谱法测定人血浆中吲达帕胺浓度及生物等效性研究

目的:建立一种简单、有效且灵敏的液质联用法(LC-MS/MS)检测人血浆中吲达帕胺浓度。方法:血浆样品经叔丁基甲基醚(tert-ButylMethyl Ether,MTBE)萃取后,选安定作内标。色谱柱为Luna C18柱(150mm×2.0mm,5μm);流动相为10mmol/L甲酸铵(含0.1%甲酸):甲醇=(20∶80,V/V);流速为0.30mL/min;采用ESI+MRM方式监测;源电压:3.5kV;源温度:100℃;吲达帕胺和安定的离子选择通道分别为:m/z 366.2→132.1,285.2→154.1。结果:吲达帕胺线性范围为0.536～45.733ng/mL,最低检测浓度为0.536ng/mL,提取回收率在69%～81%,日内、日间RSD均<15%。由湖南协力药业有限公司生产生产的吲达帕胺缓释片(1.5mg/片)与施维雅(天津)制药有限公司生产的吲达帕胺缓释片(商品名:纳催离,1.5mg/片)经单次及多次给药试验研究,具有生物等效性。结论:本方法简单、灵敏,可准确检测人体血浆中吲达帕胺的浓度。     

液相色谱-串联质谱法测定苯妥英在健康人体的血药浓度并研究其生物等效性

目的建立快速、灵敏的液相色谱-串联质谱法测定健康人血浆中的苯妥英(抗癫痫药),并进行生物等效性研究。方法血浆样品50μL经液- 液萃取后,以甲醇-水-甲酸(90:10:0．2)为流动相,Zorbax SB-C18柱分离; 样品经大气压化学电离源(APCI)正离子化后,通过三重四极杆串联质谱仪, 用选择反应监测(SRM)对苯妥英(m／z 253→m／z 182)和柳胺酚(m／z 230→ m／z 121,内标)进行测定。用此法测定了20名受试者单剂量口服受试和参比制剂后苯妥英的血药浓度。结果线性范围为2．5—3 000 ng·mL-1,定量下限为2．5 ng·mL-1;日内、日问精密度(RSD)均<7．0％,准确度(RE)在 -0．5％～2．3％。2种制剂的Cmax、AUC0-t均无显著性差异。结论该法专属、灵敏、快速,适用于复方制剂中苯妥英的生物等效性评价。     

Determination of lansoprazole in human plasma by rapid resolution liquid chromatography–electrospray tandem mass spectrometry: Application to a bioequivalence study on Chinese volunteers

A simple, sensitive and rapid LC/MS/MS method was developed for the quantification of lansoprazole in human plasma. After a simple sample preparation procedure by one-step protein precipitation with acetonitrile, lansoprazole and the internal standard bicalutamide were chromatographed on a Zorbax SB-C₁₈ (3.0 mm × 150 mm, 3.5 μm, Agilent) column with the mobile phase consisted of methanol–water (70:30, v/v, containing 5 mM ammonium formate, pH was adjusted to 7.85 by 1% ammonia solution). Detection was performed on a triple quadrupole tandem mass spectrometry by multiple reaction monitoring (MRM) mode via negative eletrospray ionization source (ESI⁻). The lower limit of quantification was 5.5 ng/mL, and the assay exhibited a linear range of 5.5–2200.0 ng/mL. The validated method was successfully applied to investigate the bioequivalence between two kinds of preparation (test vs. reference product) in twenty-eight healthy male Chinese volunteers.     

Establishment of a liquid chromatographic/mass spectrometry method for quantification of tetrandrine in rat plasma and its application to pharmacokinetic study

A rapid and sensitive liquid chromatography-tandem mass spectrometric method (LC/MS/MS) for the determination of tetrandrine in rat plasma has been developed, fully validated and successfully applied to pharmacokinetic study in Sprague-Dawley (SD) rats after a single oral administration. Sample preparation involves a liquid-liquid extraction with n-hexane-dichlormethane (65:35, containing 1% 2-propanol isopropyl alcohol, v/v). Tetrandrine and brodimoprim (internal standard) were well separated by LC with a Dikma C(18) column using acetonitrile-methanol-ammonium formate aqueous solution (20mM) containing 0.3% formic acid (20:30:50, v/v/v) as mobile phase. Detection was performed on a triple quadrupole mass spectrometer in multiple reaction monitoring mode. The ionization was optimized using ESI(+) and selectivity was achieved using MS/MS analysis, m/z 623.0-->381.0 and m/z 339.0-->281.0 for tetrandrine and I.S., respectively. The present method exhibited good linearity over the concentration range of 5-2,000 ng/mL for tetrandrine in rat plasma with a lower limit of quantification of 5 ng/mL. The intra- and inter-day precision were 2.0-9.2% and 4.5-9.4%, and the intra- and inter-day accuracy ranged from -7.6 to 10.3% and -6.0 to 5.3%, respectively. No endogenous compounds were found to interfere with the analysis, and tetrandrine was stable during the whole assay period. The method was successfully applied to a pharmacokinetic study after an intragastric administration (i.g.) of tetrandrine to SD rats with a single dose of 50mg/kg. The results confirm that the assay is suitable for the pharmacokinetic study of tetrandrine.     

Pharmacokinetics and bioequivalence analysis of amlodipine tablets in Chinese female and male volunteers by HPLC-MS/MS

In the present study, we determined the pharmacokinetics and bioequivalence of two amlodipine tablets in Chinese male and female volunteers using HPLC-MS/MS method. A randomized, two-period and crossover design was conducted in 20 healthy volunteers (14 male subjects and six female subjects). A single dose of either the reference or test formulation was given at the start of each period. Blood samples were collected before drug administration and at 1, 2, 3, 4, 5, 6, 8, 10, 12, 24, 48, 72, 96, 120 and 144 h after drug administration. Plasma amlodipine was detected by HPLC-MS/MS method, and the pharmacokinetic parameters were analyzed using DAS 3.2.8. The developed HPLC-MS/MS method was suitable for the analysis of amlodipine in biological matrix samples. The main pharmacokinetic parameters between the trial preparation and the reference preparation met the regulatory criteria for bioequivalence, and the two preparations were both well tolerated.