舒詩(shī)會(huì) 姚君亮 尹大全
摘 要 目的:采用LC-MS/MS法對(duì)拉科酰胺原料中基因毒性雜質(zhì)對(duì)甲苯磺酸甲酯進(jìn)行檢測(cè)。方法:采用 Agilent Eclipse XDB C18(2.1 mm×150 mm,3.5 mm.)柱,以5 mmol/L醋酸銨-0.1%甲酸為流動(dòng)相A,甲醇為流動(dòng)相B,梯度洗脫,流速0.4 ml/min。質(zhì)譜采用多反應(yīng)監(jiān)測(cè)(MRM)模式,離子對(duì)m/z 204.0/91.1。結(jié)果:本研究建立的方法線性范圍在2.5~100.0 ng/ml(R2=0.996),定量下限為2.62 ng/ml,日內(nèi)和日間精密度良好(RSD<5%),加標(biāo)回收率符合要求,24 h內(nèi)溶液穩(wěn)定性良好。結(jié)論:本方法靈敏度高、選擇性好、樣品前處理簡(jiǎn)單,可以滿足拉科酰胺原料中痕量對(duì)甲苯磺酸甲酯的定量檢測(cè)要求。
關(guān)鍵詞 基因毒性雜質(zhì) 對(duì)甲苯磺酸甲酯 拉科酰胺 LC-MS/MS
中圖分類號(hào):TQ460.72; O657.72 文獻(xiàn)標(biāo)示碼:A 文章編號(hào):1006-1533(2019)15-0116-04
Determination of methyl p-toluenesulfonate in lacosamide by LC-MS/MS
SHU Shihui*, YAO Junliang, YIN Daquan
(Central Research Institute, Shanghai Pharmaceuticals Holding Co., Ltd., Shanghai 201203, China )
ABSTRACT Objective: To establish an LC-MS/MS method for the determination of methyl p-toluenesulfonate in lacosamide. Methods: Chromatography separation was performed on Agilent Eclipse XDB C18 column (2.1 mm×150 mm, 3.5 mm) with gradient elution at speed 0.4 ml/min. Mass spectrometry was performed using multiple reaction monitoring (MRM) mode and ion pair m/z 204.0/91.1. Results: The linear range of methyl p-toluenesulfonate was at 2.5-100.0 ng/ml (R2=0.996) with a lower limit of quantitation of 2.62 ng/ml. The RSD of the recovery results obtained from intra- and inter-day precision study were less than 5%. The percentage recovery in drug samples was within the accepted range. The sample solution showed good stability within 24 h. Conclusion: This method has high sensitivity, good selectivity and simple sample preparation and is suitable for the quantitative determination of methyl p-toluenesulfonate in lacosamide drug substances.
KEy WORDS genotoxic impurity; methyl p-toluenesulfonate; lacosamide; LC-MS/MS
拉科酰胺是一種新型N-甲基-D-門冬氨酸受體甘氨酸結(jié)合位點(diǎn)拮抗劑,它主要用于治療癲癇和神經(jīng)性疼痛。由于拉科酰胺原料在工藝過程中使用了對(duì)甲苯磺酸和甲醇,反應(yīng)過程中可能會(huì)生成對(duì)甲苯磺酸甲酯(p-toluenesulfonate,PTSM),而對(duì)甲苯磺酸烷基酯一直被視為潛在基因毒性雜質(zhì),這些物質(zhì)可與DNA發(fā)生烷基化反應(yīng),從而可能成為癌癥的誘因。近些年來,各國(guó)藥品監(jiān)管機(jī)構(gòu)對(duì)于基因毒性雜質(zhì)的管控要求是逐年提高,EMEA(歐洲藥品管理局)以及ICH相繼頒發(fā)了基因毒性雜質(zhì)研究相關(guān)技術(shù)指導(dǎo)原則[1-2]。由于對(duì)潛在基因毒性雜質(zhì)進(jìn)行研究已成為申報(bào)文件的重要一環(huán),因此,必須對(duì)拉科酰胺原料中的PTSM予以監(jiān)控。
目前,對(duì)甲苯磺酸酯類雜質(zhì)在其他藥品中的殘留雖已有用液相色譜[3]、氣質(zhì)聯(lián)用 [4-5]和液質(zhì)聯(lián)用技術(shù) [6-9]進(jìn)行測(cè)定的報(bào)道,但拉科酰胺原料中磺酸酯類基因毒雜質(zhì)的分析尚未見有研究。眾所周知,樣品基質(zhì)對(duì)痕量雜質(zhì)測(cè)定具有非常顯著的影響,因此,很有必要對(duì)此類基因毒雜質(zhì)在拉科酰胺原料中的殘留量進(jìn)行仔細(xì)的研究。本研究嘗試采用HPLC-MS/MS法多反應(yīng)監(jiān)測(cè)(MRM)模式測(cè)定拉科酰胺原料中痕量PTSM,旨在建立靈敏度高、選擇性好、操作簡(jiǎn)單的定量檢測(cè)方法。
1 材料與方法
1.1 儀器
1200高效液相色譜儀、6460 串聯(lián)質(zhì)譜儀(美國(guó)Agilent公司); CPA225D電子天平(德國(guó)Sartorius公司);Advantage A10純水儀(美國(guó)Milli-Q公司)。
1.2 試藥
拉科酰胺原料(自制,批號(hào)119-38、119-39、100-100、100-101、100-110、100-117、100-124);PTSM對(duì)照品(百靈威公司,純度98%,批號(hào) LU70L01);甲酸(阿拉丁試劑(上海)有限公司,色譜純,批號(hào)J1529047);甲醇(美國(guó)Merck公司,色譜純,批號(hào)1749207435);水為自制高純水。