目的建立HPLC-MS/MS法测定Beagle犬血浆中去甲文拉法辛的质量浓度,研究Beagle犬经口给予琥珀酸去甲文拉法辛缓释片后的药动学特征和生物等效性。方法 24只Beagle犬双周期、自身交叉、单次/多次(连续给药7 d)经口给予琥珀酸去甲文拉法辛缓释片,采用HPLC-MS/MS法测定给药后不同时间点血浆中去甲文拉法辛的经时血药质量浓度,并计算药动学参数。结果单次经口给予受试与参比制剂后去甲文拉法辛的主要药动学参数分别为ρmax(28.1±5.7)和(26.9±7.7)μg·L^-1;tmax(1.3±0.6)和(1.6±1.0)h;t1/2(3.4±1.0)和(3.3±1.0)h;AUC0→t(147.8±58.2)和(144.6±67.4)μg·h·L^-1;AUC0-∞(159.8±59.2)和(159.1±67.1)μg·h·L^-1;相对生物利用度为(106.2±19.7)%。多次经口给予受试与参比制剂7 d后的主要药动学参数分别为ρmax(34.0±14.4)和(33.2±16.7)μg·L^-1;tmax(1.6±0.8)和(1.6±0.7)h;t1/2(3.2±1.1)和(3.5±1.3)h;AUC0→t(172.4±94.8)和(162.5±78.1)μg·h·L^-1;AUC0-∞(178.8±98.8)和(168.8±77.1)μg·h·L^-1;相对生物利用度为(107.2±39.2)%。结论单次和多次给药后,受试制剂的药动学参数ρmax和AUC对数转换后比值的90%置信区间均在参比制剂的生物等效性标准范围内,2种制剂在Beagle犬体内生物等效。
Objective To develop and validate an HPLC-MS / MS method for determinating desvenlafaxine in Beagle plasma and to study the pharmacokinetic profiles and bioequivalence of desvenlafaxine succinate sustained-tablets. Methods A single oral dose and multi-oral dose of test and reference desvenlafaxine succinate sustained-release tablets were given to 24 Beagles in an open randomized two-period crossover design. The concentration of desvenlafaxine in Beagle plasma was determined by HPLC-MS / MS method.The pharmacokinetic parameters as well as relative bioavailability were measured. Results The main pharmacokinetic parameters of test and reference preparations were as follows after a single oral dose: ρmax( 28. 1 ± 5. 7) and( 26. 9 ± 7. 7) μg·L^-1; tmax( 1. 3 ± 0. 6) and( 1. 6 ± 1. 0) h; t1 /2( 3. 4 ± 1. 0) and( 3. 3 ±1. 0) h; AUC0→t( 147. 8 ± 58. 2) and( 144. 6 ± 67. 4) μg ·h·L^-1; AUC0-∞( 159. 8 ± 59. 2) and( 159. 1 ± 67. 1) μg·h·L^-1,respectively. The relative bioavailability of the preparation was( 106. 2 ±19. 7) %. The main pharmacokinetic parameters of desvenlafaxine were as follows after a multi-oral dose of test and reference preparations: ρmax( 34. 0 ± 14. 4) and( 33. 2 ± 16. 7) μg·L^-1; tmax( 1. 6 ± 0. 8) and( 1. 6 ±0. 7) h; t1 /2( 3. 2 ± 1. 1) and( 3. 5 ± 1. 3) h; AUC0→t( 172. 4 ± 94. 8) and( 162. 5 ± 78. 1) μg·h·L^-1; AUC0-∞( 178. 8 ± 98. 8) and( 168. 8 ± 77. 1) μg·h·L^-1,respectively. The relative bioavailability of the preparation was( 107. 2 ± 39. 2) %. Conclusions The confidence interval of 90% ratio after logarithmic transformation ofρmaxand AUC of the test preparation are all within the scope of the standard. The two formulations are bioequivalent.