UPLC-MS/QAMS测定小鼠血浆中石斛碱及其代谢产物M-250、M-280的浓度

摘要

OBJECTIVE:To establish a method for the determination of dendrobine and its metabolites M-250 and M-280 in mice plasma for the first time. METHODS:Mice were given dendrobine 60 mg/kg by intragastric administration,1 h later plasma were collected and treated. Using pseudoephedrine hydrochloride as internal standard and dendrobine reference substance as control, the plasma concentrations of dendrobine and its metabolites M-250 and M-280 were determined by UPLC-MS combined with quantitative analysis of multi-components by single marker. The separation was performed on Hypersil Gold C18 column with 0.1％formic acid-acetonitrile(gradient elution)at the flow rate of 0.3 mL/min. The column temperature was set at 40℃,and sample size was 5 μL. Heatable electrospray ionization (HESI) source, scan/ESI + were applied and operated in positive ion mode with atomization temperature of 300℃,ion transmission tube temperature of 350℃,the sheath gas velocity of 35 arb,the auxiliary air velocity of 15 arb,the spray voltage of 3.5 kV,the collision voltage of 30,40,50 eV. The mass-to-charge ratio of detection range were 100-1500. RESULTS:The endogenous substances of mice plasma had no interference with the content determination of dendrobine and its metabolites M-250 and M-280. The linear range of dendrobine were 9.13-912.94 ng/mL(r=0.9996). The limit of quantitation was 3.04 ng/mL. RSDs of intra-day and inter-day were all less than 7.5％(n=5 or n=3). The accuracy were 96.8％-107.5％(n=5). Matrix effects were 97.1％-106.0％(RSD=1.8％-4.7％,n=5). RSDs of the content of sample at 15℃ for 24 h,at -70 ℃ after three times freeze-thaw,at -70 ℃ for 15 d were lower than 12.8％ (n=3). The content of dendrobine in plasma sample of mice was (41.3 ± 5.7) ng/mL (n=12). The contents of its metabolites M-250 and M-280 were (493.0 ± 73.1) and (41.4 ± 3.0) ng/mL (n=12) with Relative correction factor of 1.0. CONCLUSIONS: The method is sensitive and accurate,and can be used for content determination of dendrobine and its metabolites M-250 and M-280 in mice plasma.%目的:首次建立测定小鼠血浆中石斛碱及其代谢产物M-250、M-280浓度的方法.方法:小鼠灌胃石斛碱60 mg/kg,1 h后收集血浆处理后,以盐酸伪麻黄碱为内标,以石斛碱对照品为对照,采用超高效液相色谱-质谱/一测多评法测定石斛碱及其代谢产物M-250、M-280的血药浓度.色谱柱为Hypersil Gold C18,流动相为0.1％甲酸水溶液-乙腈(梯度洗脱),流速为0.3 mL/min,柱温为40℃,进样量为5μL;采用可加热电喷雾离子源,全扫描/正离子模式,雾化温度为300℃,离子传输管温度为350℃,鞘气流速为35 arb,辅助气流速为15 arb,喷雾电压为3.5 kV,碰撞电压为30、40、50 eV,质荷比检测范围为100～1500.结果:小鼠血浆中内源性物质对石斛碱及其代谢产物M-250、M-280浓度测定无干扰;石斛碱检测质量浓度线性范围为9.13～912.94 ng/mL(r=0.9996);定量下限为3.04 ng/mL,日内、日间精密度的RSD≤7.5％(n=5或n=3);准确度为96.8％～107.5％(n=5);基质效应为97.1％～106.0％(RSD=1.8％～4.7％,n=5);质控血浆样品溶液15℃保存24 h、-70℃保存并反复冻融3次以及-70℃保存15 d后浓度的RSD≤12.8％(n=3).小鼠血浆样品中石斛碱质量浓度为(41.3±5.7)ng/mL(n=12),以相对校正因子(RCF)按1.0计,代谢产物M-250、M-280的质量浓度分别为(493.0±73.1)、(41.4±3.0)ng/mL(n=12).结论:该方法灵敏、准确,可用于小鼠血浆中石斛碱及其代谢产物M-250、M-280的浓度测定.