替尼类药物关键中间体N-芳基喹唑啉-4-胺化合物的简便合成

目的 研究替尼类药物的关键中间体N-芳基喹唑啉-4-胺化合物的新合成方法,优化反应条件,确定反应底物适用性,推测反应可能机理。方法 以取代邻氨基苯甲腈(1a～1e)和芳胺(2a～2e)为原料,甲酸为反应底物和溶剂,Cu(OTf)₂为催化剂,发生多组分串联反应一锅合成N-芳基喹唑啉-4-胺化合物(3a～3g),考察催化剂及用量、溶剂、反应物用量、反应温度和反应时间对反应的影响。结果 在Cu(OTf)₂的催化下,取代邻氨基苯甲腈、芳胺和甲酸能顺利发生串联的加成/缩合/环化反应,在取代邻氨基苯甲腈5 mmol,芳胺6 mmol,Cu(OTf)₂ 0.5 mmol,甲酸20 mL,110 ℃反应12 h的条件下,以80%～95%的收率得到7个N-芳基喹唑啉-4-胺化合物,目标产物结构经¹H-NMR和¹³C-NMR确证。结论 该方法为合成替尼类药物关键中间体N-芳基喹唑啉-4-胺化合物提供了一种高效简便的绿色工艺,反应条件温和,产物收率高,操作安全简便,对环境友好。     

金银花炮制前后咖啡酰奎宁酸类成分变化

目的 建立炒金银花和金银花炭中咖啡酰奎宁酸类成分的含量测定方法,研究金银花炮制前后咖啡酰奎宁酸类成分的含量变化。方法 确定提取方法、检测波长、流动相组成等色谱条件,并且考察了所建立分析方法专属性、线性、耐用性、重复性、回收率和精密度。结果 采用提取溶剂为体积分数50%甲醇,料液比为1∶200,超声提取30 min。含量测定采用高效液相色谱法,色谱柱为十八烷基硅烷键合硅胶(柱长为250 mm,内径为4.6 mm,粒径为5 μm)为填充剂;以乙腈为流动相A,以0.4％磷酸溶液为流动相B,梯度洗脱;柱温为30 ℃;流速为1.0 mL·min^-1;检测波长为327 nm。新绿原酸、绿原酸、隐绿原酸、3,4-O-二咖啡酰奎宁酸、3,5-O-二咖啡酰奎宁酸、4,5-O-二咖啡酰奎宁酸的专属性、线性、耐用性、重复性、回收率和精密度均符合要求。结论 该方法操作简单,可用于炒金银花、金银花炭中6种酚酸类成分含量的同时测定。6种咖啡酰奎宁酸在金银花炮制前后含量、比例变化显著,为其炮制工艺、质量控制和活性研究等提供了依据。     

人血清中舍曲林、度洛西汀、氟伏沙明、氟西汀和去甲氟西汀的LC-MS/MS方法建立及临床应用

目的 建立人血清中舍曲林、度洛西汀、氟伏沙明、氟西汀和去甲氟西汀浓度同时测定的LC-MS/MS方法,实现临床样本的治疗药物监测。方法 以N-甲基氟西汀和N-甲基度洛西汀为内标,用甲醇-乙腈(1∶1,V∶V)混合溶剂沉淀蛋白;使用ES Sonoma C₁₈(2)色谱柱(2.1 mm×50 mm,3 μm),以0.2%乙腈和50%甲醇水溶液(含6 mmol·L^-1乙酸铵)为流动相,梯度洗脱;使用三重四级杆质谱进行质量分析,采用电喷雾离子源,在正离子模式下以MRM的扫描模式进行定量分析。结果 所建方法经验证,空白基质对分析物和内标无干扰,注射完高浓度样品后各分析物和内标均无残留,基质效应符合文件要求(内标归一化的基质因子变异系数CV%＜15%),处理后的样品24 h内分析稳定、未处理样本4 ℃冰箱存放1周稳定,舍曲林、度洛西汀、氟伏沙明、氟西汀及去甲氟西汀分别在9.22~295.16、10.80~345.60、8.10~259.12、10.11~323.54及5.90~188.70 ng·mL^-1内均具有良好的线性关系,r²＞0.99,方法的准确度高、精密度好。结论 该方法的样本处理简单,样本分析时间短,可实现大量临床样本的快速分析,已成功应用于临床服用舍曲林、度洛西汀、氟伏沙明、或氟西汀的患者血药浓度监测。     

HPLC-CAD法测定芪蛭通络胶囊中苷类成分的含量

目的 建立高效液相色谱-电喷雾检测器方法(HPLC-CAD)同时测定芪蛭通络胶囊中人参皂苷Rb₁和黄芪甲苷的含量。方法 采用色谱柱为Waters XSclectHss T3-C₁₈(4. 6 mm×250 mm,5 μm),水(A)-乙腈(B)为流动相,梯度洗脱(0 min,15% B;0～10 min,15%~25%B;10～15 min,25%B~31%B;20～50 min,31%B),流速1 mL·min^{- 1},柱温25 ℃,进样量为20 μL。电喷雾检测器(CAD)雾化器温度为35 ℃,功能参数(power function,PF)为1.0。结果 芪蛭通络胶囊中人参皂苷Rb₁和黄芪甲苷均具有良好的线性关系(r＞0.999 0),定量限(LOQ)分别为0.013和0.015 μg,精密度、重复性、24 h稳定性实验的相对标准偏差(RSD)值均小于3.0%,平均加样回收率分别为91.74%和100.09%。结论 本研究建立的HPLC-CAD法可同时对芪蛭通络胶囊中人参皂苷Rb₁和黄芪甲苷进行含量测定,为芪蛭通络胶囊的检测分析和质量控制提供了新的方法。     

溶菌酶纯度测定方法的建立

目的 建立反相高效液相色谱法(RP-HPLC)测定溶菌酶的纯度。方法 使用Agilent ZORBAX 300SB C₈色谱柱(4.6 mm×250 mm,5 μm);以三氟乙酸-水-乙腈(2∶700∶300)为流动相A,以三氟乙酸-水-乙腈(2∶200∶800)为流动相B,进行梯度洗脱,流速为1.0 mL·min^-1,检测波长为280 nm,进样量为20 μL。并采用QE Plus质谱仪对其中单个最大杂质进行了相对分子质量测定。结果 建立的PR HPLC方法能够有效分离溶菌酶中主要杂质,主峰与各杂质峰均能较好分离,方法专属性强、溶菌酶在0.004～0.5 mg·mL^-1的内线性良好(r=1.000 0);定量限为0.08 μg,检出限为0.04 μg;精密度、重复性、20 h样品稳定性实验的相对标准偏差(RSD)值均小于0.5%;11批样品纯度测定结果为89%～94%;各样品中单个最大杂质峰中所含物质是相对分子质量不等的混合物。结论 建立的RP-HPLC方法可以用于溶菌酶纯度的检测。     

盐酸溴己新雾化气溶胶浓度测定及空气动力学粒径分布分析

目的 建立液相色谱-三重四极杆串联质谱法(LC-MS/MS)测定盐酸溴己新雾化气溶胶浓度和分析其粒径分布,并比较注射器采样法及撞击器采样法的差异。方法 采用BEH C₁₈色谱柱(2.1 mm×100 mm,1.7 μm)分离,流动相为体积分数0.1%甲酸水和乙腈,分析时长为2 min,正离子模式下多反应监测测定。同时,对液质联用方法进行了方法学验证,采用该方法对注射器采样法及撞击器采样法采样获得的雾化气溶胶样本进行浓度测定,并基于撞击器采样法计算气溶胶的空气动力学粒径分布。结果 建立的方法专属性、线性、定量限、精密度、准确度、提取回收率和稳定性良好。注射器采样法下总体气溶胶平均药物浓度为17.2 mg·m^-3,撞击器采样法下则为16.8 mg·m^-3。基于撞击器采样法分析得到雾化时间在5 和45 min的气溶胶平均质量中值空气动力学粒径(MMAD)分别为2.21 和2.24 μm,几何标准偏差(GSD)分别为2.76和2.75。结论 本测定方法灵敏度高,精密度好,适用于盐酸溴己新雾化气溶胶浓度测定和粒径分布分析。两种样本采集方式的浓度测定结果基本一致,结果可为吸入制剂雾化气溶胶分析提供参考。     

超高效液相色谱-质谱联用技术评价当归养血丸中阿胶投料情况

目的 建立当归养血丸中阿胶的检测方法,为投料阿胶质量控制提供技术支持。方法 采用胰蛋白酶对当归养血丸进行酶解,利用超高效液相色谱-质谱联用技术(UPLC-MS/MS),在电喷雾离子化(ESI⁺)模式下,进行多反应监测(multiple reaction monitoring,MRM),进行阿胶专属鉴别、马皮源成分检查及阿胶特征多肽含量测定。结果 建立方法线性、专属性、稳定性、重复性、耐用性良好。以此方法,11批当归养血丸中均检出阿胶,其中9批检出马皮源成分,7批低于阿胶特征多肽含量拟定限度。结论 所建立的方法准确可靠、专属性强,可用于当归养血丸中阿胶的质量评价。     

首批甘氨酰-L-酪氨酸国家对照品的标定研究

目的 为有效控制复方氨基酸(15)双肽(2)注射液的产品质量,标定甘氨酰-L-酪氨酸的首批国家标准物质的含量,同时揭示肽类药品标准物质标定过程中的一些共性特殊问题。方法 采用紫外光谱、高分辨质谱和一维/二维核磁共振谱对其进行结构确证,利用高效液相色谱法进行有关物质的测定及稳定性考察,采用质量平衡法进行标准物质含量计算,并通过核磁共振定量法对质量平衡法的准确性进行验证。结果 确证了甘氨酰-L-酪氨酸的结构,并测定了首批甘氨酰-L-酪氨酸国家标准物质的含量为88.4%。结论 针对本品的特点,分别采用多种不同方法对本品进行定性与定量研究,确保国家对照品标定结果准确性。     

硫酸吗啡原料药中有关物质检查方法研究

目的 通过对硫酸吗啡原料药的有关物质进行分析,考察现行标准的完善性,探讨存在的问题,为提高产品质量标准提供参考。方法 采用HPLC,选用Symmetry C₁₈(4.6 mm×150 mm,5 μm)色谱柱,以1.01 g·L^-1庚烷磺酸钠溶液(用50%磷酸调节pH值至2.6)和甲醇为流动相进行梯度洗脱;检测波长为230 nm,流速为1.5 mL·min^-1,柱温35 ℃。结果 国内硫酸吗啡原料药中检出的主要杂质有可待因(杂质A)、伪吗啡(杂质B)、10-羟基吗啡(杂质D)、吗啡酮(杂质E)和吗啡氮氧化物(杂质F),溶液稳定性显示其中伪吗啡含量增加明显,表明样品需临用新配。结论 建立方法的专属性、线性等均良好,能用于硫酸吗啡原料药中有关物质的检测。现行标准中缺少有关物质检查项,建议增加。     

防风色原酮类对照提取物在玉屏风颗粒含量测定中的应用

目的 通过以防风色原酮类对照提取物及升麻素苷、升麻素、5-O-甲基维斯阿米醇苷和亥茅酚苷4种单体对照品为对照的对比研究,建立以防风色原酮类对照提取物为对照的对于含防风药味的复方制剂玉屏风颗粒的质量控制方法,考察对照提取物在制剂质量研究中应用的可行性。方法 采用CAPCELL PAK C₁₈色谱柱(4.6 mm × 150 mm,5 μm),以甲醇(A)-体积分数0.3%磷酸水溶液(B)为流动相梯度洗脱,对玉屏风颗粒进行含量测定。结果 4种指标性成分在各自的检测质量浓度范围内具有良好的线性关系(r≥ 0.999 5),精密度、重复性、准确度相对标准偏差(RSD)值均小于3%且稳定性良好。结论 综上,防风色原酮类对照提取物可以替代单体对照品用于玉屏风颗粒含量测定,且操作简便、稳定可靠,为中药质量控制模式的转变提供新的思路与方法。     

UPLC-MS/MS测定大鼠血浆中奥拉帕利的浓度及其药动学研究

目的 建立一种具有高灵敏度和高选择性测定大鼠血浆中奥拉帕利药物浓度的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法,并研究奥拉帕利在大鼠体内的药动学特征。方法 大鼠血浆样品采用乙腈沉淀法去除蛋白,色谱柱为Acquity UPLC BEH C₁₈柱 (2.1 mm×50 mm,1.7 μm),流动相为0.1%甲酸水溶液-乙腈,梯度洗脱。质谱采用电喷雾离子源,多反应监测正离子模式,奥拉帕利定量离子对为m/z 435.19→m/z 367.1。以50 mg·kg^-1奥拉帕利经大鼠灌胃给药后于不同时间点采集血样,利用建立的方法进行检测分析,并用DAS2.0软件计算药动学参数。结果 血浆中奥拉帕利在(0.6~1 821) ng·mL^-1内线性关系良好,定量限为0.15 ng·mL^-1,日内、日间精密度RSD均小于5.5%,准确度在95.4%~99.2%内,平均提取回收率为84.2%~96.0%,基质效应在91.4%~108.8%内。结论 建立的方法灵敏度高、结果准确,可用于大鼠血浆中奥拉帕利质量浓度的测定及其药动学研究。     

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??OBJECTIVE To establish an HPLC-TQ-MS/MS assay for simultaneous determination of berberine, plantamajoside, saikosaponin a, tetrahydropalmatine, paeoniflorin and amygdalin in rat plasma and investigate the pharmacokinetics of Jiawei Baiteng extracts in rats. METHODS The separation was achieved on an Agilent Poroshell 120 EC-C₁₈ column(3.0 mm??100 mm,2.7 ??m) at 35 ??. The mobile phase was consisted of 0.05% formic acid aqueous solution and acetonitrile containing 0.05% formic acid, eluting with a gradient procedure. Mass spectrometry was performed in the multiple reaction monitoring (MRM) mode, with programmed ionization modes witching and time segment scanning. The ion reactions for quantification were as follows: m/z 335.9??m/z 319.9(berberine, ESI⁺), m/z 639.1??m/z 160.9(plantamajoside, ESI^-),m/z 779.3??m/z 617.4(saikosaponin a, ESI^-),m/z 356.0??m/z 192.0(tetrahydropalmatine,ESI⁺),m/z 449.1??m/z 121.1(paeoniflorin, ESI^-),m/z 456.1??m/z 323.1(amygdalin, ESI^-),m/z 323.9??m/z 126.9(gliclazide, internal standard, ESI⁺) and m/z 321.9??m/z 170.1 (gliclazide, internal standard, ESI^-). Blood samples were collected in heparinized tubes via the retinal venous plexus from each rat after a single oral dose of Jiawei Baiteng extracts(3.1 g??kg^-1). The plasma samples were pretreated by methanol precipitation to remove protein components, and then analyzed by HPLC-TQ-MS/MS. The pharmacokinetic parameters of the bioactive components of Jiawei Baitengex tracts in rats were calculated by DAS (Drug and Statistics for Windows) software(Version 2.0). RESULTS The methodological test showed that the linear concentration ranges of berberine, plantamajoside, saikosaponin a, tetrahydropalmatine, paeoniflorin and amygdalin were 0.59-292.50, 0.68-168.75, 6.05-1 512.50, 0.68-337.50, 6.70-1 675.00 and 5.60-1 400.00 ng??mL^-1, respectively. The limits of quantification (LOQs) of the six analytes were 0.59,0.68,6.05,0.68,6.70 and 5.60 ng??mL^-1, respectively. The HPLC-TQ-MS/MS method was also validated with good precision, recovery and stability, which conformed to the analytical standards of biological samples. CONCLUSION The established method is proved to be sensitive, simple and reliable, which is suitable for the pharmacokinetic study of Jiawei Baiteng extracts.     

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??OBJECTIVE To establish an LC-MS/MS method to determine (S)-pantoprazole sodium in dog plasma and investigate its toxicokinetics. METHODS After protein precipitation with acetonitrile, the analyte and internal standard were separated on CHIRALCEL OJ-RH column (4.6 mm ??150 mm, 5 ??m) with acetonitrile-water (28??72) as mobile phase eluted at a flow rate of 0.6 mL??min^-1. Detection was carried out by electrospray positive ionization mass spectrometry in the multiple reaction monitoring (MRM) mode. The MRM transitions of m/z 384.0/199.8 and m/z 180.0/110.0 were used to quantify (S)-pantoprazole sodium and phenacetin, respectively. Beagle dogs were intravenously given (S)-pantoprazole sodium for 4 weeks at low, medium, and high dosages (10, 20, 40 mg??kg^-1??d^-1). RESULTS The calibration curve was linear over the concentration range of 50-30 000 ng??mL^-1. The RSDs were less than 15%, and the accuracy was in the range of 85%-115%. The AUC_{0-4 h} and ??_max of (S)-pantoprazole sodium were proportional to the dosages. CONCLUSION The established method can be applied to the determination of (S)-pantoprazole sodium in plasma of dogs and is suitable for the toxicokinetic study.     

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??OBJECTIVE To establish a UPLC-MS/MS method for the determination of ropivacaine and sufentanil plasma concentration in neonate and maternal. METHODS Ropivacaine and sufentanil were extracted from plasma by ethyl acetate and ethyl ether (1??1,V/V), and determined by LC-MS/MS using bupivacaine as the internal standard. Separation was carried on Waters BEH C₁₈ column (2.1 mm??50 mm, 1.7 ??m) with a mobile phase of 0.1% formic acid acetonitrile -0.1% formic acid water. The flow rate was 0.35 mL??min^-1 and column temperature was maitained at 45 ??. ESI source was applied and operated in positive ion mode. Quantitative determination was performed using multiple reaction monitoring (MRM) of m/z 275.2??m/z 126.0 for ropivacaine, and m/z 387.1??m/z 238.1 for sufentanil. RESULTS There were good linearity of ropivacaine (0.25-202.0 ng??mL^-1) and sufentanil (0.165-133.6 ng??mL^-1), and the correlation coefficient (r²) were greater than 0.995. The extraction recovery for ropivacaine and sufentanil were more than 71.62%, while the intra-day precision (RSD) were lower than 13.86%. CONCLUSION The method is accurate and high sensitive, providing a good analysis mean for monitoring neonate and maternal blood concentration of ropivacaine and sufentanil.     

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??OBJECTIVE To establish an HPLC-MS/MS method for the determination of melatonin in human plasma. METHODS The plasma samples were extracted with ethyl acetate, using melatonin-D7 as the internal standard (IS). Then the ethyl acetate layer was evaporated in vacuum concentrator. Dried samples were redissolved in mobile phase (0.1% formic acid-methanol= 56:44, V/V), vortexed and centrifuged. The redissolved solution was transferred to an auto sampler vial and the supernatant was injected to the HPLC-MS/MS system. The MS/MS analysis was carried out in positive ionization mode by multiple reactions monitoring (MRM) at m/z 233.1??174.1 for melatonin and m/z 240.2??178.0 for IS, respectively. RESULTS The calibration curve of melatonin in human plasma was linear over the concentration range of 0.020 00-30.00 ng??mL^{- 1}. The lower limit of quantitation was 0.020 00 ng??mL^{- 1}. The RSDs of within-day and between-day were less than 15%. The extraction recoveries were between 59.0%-65.0%. The matrix effects were between 95.5%-98.9%. CONCLUSION The method is proved to be convenient, sensitive and accurate. It can be applied to study the pharmacokinetics of melatonin prolonged-release tablets in healthy Chinese volunteers.     

环介导等温扩增技术在西洋参鉴定中的应用

目的 探讨利用环介导等温扩增技术(loop-mediated isothermal amplification,LAMP)技术鉴别西洋参的方法.方法 针对西洋参的CYP450基因设计特异性引物,应用RT-LAMP(real time-LAMP)、琼脂糖凝胶电泳和可视化检测3种方法对LAMP检测方法进行优化,并对其灵敏性...     

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??OBJECTIVE To develop an UPLC-MS/MS method for the determination of rivaroxaban in human plasma and apply it to the pharmacokinetics study. METHODS The plasma samples were precipitated by acetonitrile. The Waters Acquity BEH C₁₈ column(2.1 mm??50 mm,1.7 ??m)was adopted. The mobile phase was acetonitrile and water with the gradient elution at the flow rate of 0.40 mL??min^-1. Detection of the analyte was achieved by using positive ion electrospray ionization(ESI) in the multiple reaction monitoring(MRM) mode. The MS/MS iontransitions monitored were m/z 437.3??145.0 and m/z 440.1??145.0 for rivaroxaban and internal standard, respectively. Blood plasma samples were collected and tested after patients with deep-vein thrombosis(n=6) took single oral dose of rivaroxaban tablets(20 mg). RESULTS The linear range of rivaroxaban was 0.5-400 ng??mL^-1(r=0.998 3). The lower limit of quantitation was 0.5 ng??mL^-1 and the intra-day and inter-day relative standard deviations were <15%. The recovery rate was stable and nosignificant matrix effect was found. The maximum plasma concentration(??_max) of rivaroxaban in patients with deep-vein thrombosis was 317.4 ng??mL^-1,and the time to ??_max was 2.0 h, and the elimination half-life(t_1/2) in plasma was 6.5 h. CONCLUSION This method is rapid, specific, reliable and suitable for the determination of rivaroxaban in human plasma and pharmacokinetic study.     

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??OBJECTIVE To determine gatifloxacin in human plasma, and study the exposure characteristics of gatifloxacin in Chinese healthy male volunteers who used Gatifloxacin Eye Gel for 7 d.METHODS LC-MS/MS method was developed for the quantitation of gatifloxacin in human plasma. After protein precipitation with methanol and dilution with water, the chromatographic separation was carried out on an Symmetry C₁₈ column (4.6 mm??100 mm, 5 ??m) with a gradient mobile phase consisting of 0.1% formic acid in methanol and 0.1% formic acid in water at a flow rate of 0.5 mL??min^-1. The quantitation analysis was performed using multiple reaction monitoring (MRM) at the specific ion transitions of m/z 376.2??261.0 for gatifloxacin and m/z 332.1??288.1 for ciprofloxacin (internal standard) in the positive ion mode with electrospray ionization (ESI) source. Specificity, linearity, precision and accuracy, matrix effects, recovery and stability were investigated to validate the LC-MS/MS method. Plasma samples of different times from 10 Chinese healthy male volunteers were determined, who used Gatifloxacin Eye Gel for 7 d.RESULTS The linear range was 2-500 ng??mL^-1. The intra- and inter-day precisions were less than 2.61% and 13.1%, and the accuracy was within??5.0%. Matrix effective, recovery, specificity and stability were within??15.0%. The concentration of gatifloxacin in human plasma was below the lower limit of quantitation (2 ng??mL^-1). CONCLUSION This method is sensitive and accuracy for the determination of gatifloxacinin human plasma, and the plasma gatifloxacin level are all below the lower limit of quantitation (2 ng??mL^-1) in all subjects.     

杜仲叶清除DPPH自由基动力学特性及抗氧化活性成分筛选

目的 研究杜仲叶抗氧化清除1,1-二苯基-2-苦肼基(DPPH)自由基的动力学特性,筛选其抗氧化活性成分,建立与抗氧化活性相关的质量控制方法.方法 比较不同杜仲叶样品浓度、反应温度和反应时间对DPPH自由基清除率的影响,测定杜仲叶清除DPPH自由基活性的半数清除率(IC50).采用DPPH-HPLC法测定杜仲叶与DPP...     

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??OBJECTIVE To develop and validate a sensitive and specific ultra-performance liquid chromatography-tandemmass spectrometric (LC-MS/MS) method for the assay of diosgenin in rat plasma. METHODS Tanshinone ??A was employed as internal standard. Diosgenin was determined after the methanol-mediated plasma protein precipitation. The separation was performed on the Phenomenex kinetex xb C₁₈ column (2.1 mm??50 mm,2.6 ??m) gradiently eluted with the mobile phase consisting of methanol(containing 0.1% formic acid)-0.1% aqueous formic acid. The flow rate was 0.2 mL??min^-1, the column temperature was maintained at 40 ??, and the injection volume was 5 ??L. A triple quadrupole mass spectrometer equipped with electrospray ionization source was used as detector in a positive ion mode. Multiple reaction monitoring (MRM) mode was applied with the transition of m/z 415.2??271.1 and m/z 295.1??249.1 for diosgenin and internal standard, respectively. RESULTS For diosgenin the standard curve was linear from 10 to 500 ng??mL^-1(r=0.998 3), the limit of quantitative limit was 10 ng??mL^-1, the intra- and inter-assay variabilities were below 15%, the accuracies were between 96.1% and 102.3%, the average extract recoveries ranged from 73.8% to 75.2%, and the matrix effects was between 85.8% and 91.7%. For the internal standard, the extract recovery and matrix effects were 83.8% and 92.4%, respectively. The rats were administered orally with diosgenin (100 mg??kg^-1). The peak concentration of diosgenin was (344.067??34.48) ng??mL^-1, the time for peak concentration was (4.167??2.041) h, the half-time was (14.85??10.53) h, and the area under concentration-time curve from zero to 72 h was (4 965.648??1 036.129) ??g??h??L^-1. CONCLUSION This assay is specific, simple, sensitive and rapid, which can be applied in the pharmacokinetic study of diosgenin in rats.