CN105510496B - 一种富马酸卢帕他定原料药合成工艺中dmf残留的测定方法 - Google Patents

一种富马酸卢帕他定原料药合成工艺中dmf残留的测定方法 Download PDF

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CN105510496B
CN105510496B CN201510828197.2A CN201510828197A CN105510496B CN 105510496 B CN105510496 B CN 105510496B CN 201510828197 A CN201510828197 A CN 201510828197A CN 105510496 B CN105510496 B CN 105510496B
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YICHANG HEC CHANGJIANG PHARMACEUTICAL Co Ltd
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Abstract

本发明提供一种富马酸卢帕他定原料药合成工艺中DMF残留的测定方法,包括如下步骤,取富马酸卢帕他定原料药于具塞滤芯管中,加水密塞振摇并超声5min,3000转滤芯10min,0.45um滤膜过滤后取上清液,作为供试液;取DMF于量瓶中,加水溶解并稀释至刻度后另取5.0ml于50ml的量瓶中加水稀释至刻度摇匀作为对照液;量取上述供试液与对照液各5ul按高效液相色谱法依法测定,并记录色谱图至10min,按外标法计算,DMF残留。开待测样品的溶解浓度过高而导致的色谱柱容量超载、减小测定干扰。

Description

一种富马酸卢帕他定原料药合成工艺中DMF残留的测定方法
技术领域
本发明涉及药品中的溶剂残留采用高效液相色谱法的检查方法,具体是富马酸卢帕他定原料药合成工艺中所用溶剂的DMF采用新开发的高效液相色谱法进行检测。
背景技术
N,N一二甲基甲酰胺,简称DMF,在常温常压下为无色透明的液体、略带氨味,其分子式为C3H7NO,分子量73.10。相对密度0.9445(25℃)。熔点-61℃。沸点152.8℃。闪点57.78℃。蒸气密度2.51。蒸气压0.49kpa(3.7mmHg25℃)。自燃点445℃。折射率1.42817,溶解度参数δ=12.1。蒸汽与空气混合物爆炸极限2.2~15.2%。与水和通常有机溶剂混溶,与石油醚混合分层。遇明火、高热可引起燃烧爆炸。能与浓硫酸、发烟硝酸剧烈反应甚至发生爆炸。危险标记7(易燃液体)主要用途主要用作工业溶剂,医药工业上用于生产维生素、激素,也用于制造杀虫剂。
本公司研发的3.1类新药富马酸卢帕他定原料药,在合成过程中用到了6种溶剂,其中包含DMF的6种溶剂的名称及相关参数见。
表1(所用溶剂清单)
现有技术的缺陷
常规的溶剂残留均采用气相色谱法,本公司针对上述6种溶剂开发了在同一系统下检测气相色谱条件,但在开发研究过程中,出现了两个技术问题:
一是溶剂的选择DMSO:甲醇、乙醇、四氢呋喃、DMF溶于水,二氯甲烷、甲苯不溶于水,由此只能选择俗称的万能溶剂DMF或DMSO,DMF为待测组分.
二是六种待测组分沸点由65~154℃,采用顶空进样时为保证DMF完全气化,炉温不得低于100℃,温度到100℃时待测样品(富马酸卢帕他定RPT)已发生高温裂解,待测组分DMF还未见有响应,温度升高至110℃时待测组分DMF在系统中有响应,但响应不高,更糟糕的是待测样品(富马酸卢帕他定RPT)高温裂解峰增加到了4个,已经影响到了正常待测组分的检测,产生的测定干扰无法排除。具体测试数据与图谱见表2,图谱见附图1~2。
表2(测定干扰的相关图谱)
发明内容
针对上述运行不便的技术方案,本发明进行了如下改进,一是:溶剂选择为DMF:甲醇、乙醇、四氢呋喃、二氯甲烷、甲苯五种组分采用气相色谱法;二是:重新开发不产生高温裂解待测样品(富马酸卢帕他定RPT)的高效液相色谱法测待测组分DMF。具体如下:
一种富马酸卢帕他定原料药合成工艺中DMF残留的测定方法,包括如下步骤:
取富马酸卢帕他定原料药于具塞滤芯管中,加水密塞振摇并超声5min,3000转滤芯10min,0.45um滤膜过滤后取上清液,作为供试液;
取DMF于量瓶中,加水溶解并稀释至刻度后另取5.0ml于50ml的量瓶中加水稀释至刻度摇匀作为对照液;
量取上述供试液与对照液各5ul按高效液相色谱法依法测定,并记录色谱图至10min,按外标法计算,DMF残留。
高效液相色谱测定的条件为:色谱柱C18(4.6×250mm、5μm);流动相为甲醇与水;检测波长224nm;进样量5μm;柱温30℃;流速1.0mL/min。
流动相中甲醇与水以梯度运行,具体为,0min,甲醇15份,水85份;10min,甲醇30份,水70份;20min,甲醇100份,水0份;25min,甲醇100份,水0份;35min,甲醇15份,水85份。
溶剂残留测定常规采用气相色谱法,在待测组分多且待测样品性质特殊时无法满足测定要求的情况下。变通思路开发出操作便利,测定结果无干扰的DMF在样品中的残留测定。
供试液配制时选择易溶待测样品中的待测组分,不溶、难溶或微溶待测样品的溶剂,(DMF在水中易溶,富马酸卢帕他定在水中几乎不溶)避开待测样品的溶解浓度过高而导致的色谱柱容量超载、减小测定干扰。
色谱系统运行时间35min,但色谱图只记录至10min(待测组分完全显示后,其它干扰依然洗脱完全,只是不记载在色谱中,这样便于图谱的处理)。
附图说明
图1为DMSO为溶剂,炉温100℃(六种待测组分+样)高温裂解图谱。
图2为DMSO为溶剂,炉温110℃(六种待测组分+样)高温裂解图谱。
图3为RPT原料药中DMF的残留测定溶剂图谱。
图4为RPT原料药中DMF的残留测定对照图谱。
图5为RPT原料药中DMF的残留测定供试液图谱。
图6为RPT原料药DMF的残留测定溶剂色谱图记录至35min时图谱。
图7为RPT原料药DMF的残留测定供试液色谱图记录至35min时图谱。
具体实施方式
实施例1
称取本品约0.25g于10ml的具塞滤芯管中,加水5ml密塞振摇并超声5min,3000转滤芯10min,取上清液(必要时0.45um滤膜过滤)作为供试液。称取DMF约44mg于100ml量瓶中,加水溶解并稀释至刻度,在另取5.0ml于50ml的量瓶中加水稀释至刻度摇匀作为对照液,量取上述供试品溶液与对照液各5ul按高效液相色谱法依法测定,并记录色谱图至10min,按外标法计算,DMF残留不得过0.088%。
开发采用高效液相色谱法测定富马酸卢帕他定DMF残留
色谱条件与系统适用性
高效液相色谱仪:Agilent-1260、1200;
色谱柱:C18(4.6×250mm、5μm);
流动相:甲醇:水运行梯度见下列表3;
检测波长:224nm;
进样量:5ul;
柱温:30℃;
流速:1.0ml/min;
记录色谱图至10min。
表3流动相:甲醇、水运行梯度表
时间 甲醇 备注
0 15 85 /
10 30 70 停止检测器记
20 100 0 /
25 100 0 /
35 15 85
该测定法的验证见表3
见表3RPT原料药中DMF残留测定法验证结果汇总
新开发采用高效液相色谱法测定的RPT原料药中的DMF残留通过验证并以运行于生产过程的检测,结果准确可靠。见实例图谱附图3~5。
另外在测定的图谱记录过程中进行了优化,该测定法设置的梯度在前10min内洗脱平缓,采集基线平滑,待测组分在4.4min左右已被洗脱出,10min后洗脱强度增大,随着系统压力的减小采集基线上漂,在处理数据时选择量程以显示组分DMF目标峰为主,色谱图记录至10min后以后运行的方式处理,便于数据的处理。效果图见6~7。
溶剂残留的测定药典及相关文献收载测定法均采用气相色谱法,在测定法在实际运用过程中出现了不适用。在开发RPT原料药中的DMF残留的测定法时,我们突破常规的思路,采用高效液相色谱法:一是避开了气相色谱法高温带来的RPT原料药的裂解产生的干扰无法排除的困扰;二是采用高效液相色谱法操作更便利,测定成本也相对降低。还利用RPT原料药中待测组分DMF易溶于水而RPT原料药难溶于水的特性,采用水做溶剂解除了RPT原料药的高温裂解,RPT原料药在水中难溶也减小了测定干扰。

Claims (1)

1.一种富马酸卢帕他定原料药合成工艺中DMF残留的测定方法,其特征在于,包括如下步骤:
取富马酸卢帕他定原料药于具塞滤芯管中,加水密塞振摇并超声5min,3000转滤芯10min,0.45um滤膜过滤后取上清液,作为供试液;
取 DMF于量瓶中,加水溶解并稀释至刻度后另取5.0ml于50ml的量瓶中加水稀释至刻度摇匀作为对照液;
量取上述供试液与对照液各5ul按高效液相色谱法依法测定,并记录色谱图至10min,按外标法计算,DMF残留;
高效液相色谱测定的条件为:色谱柱C18 4.6×250 mm、5µm;流动相为甲醇与水;检测波长224nm;进样量5μm;柱温30℃;流速1.0mL/min;
流动相中甲醇与水以梯度运行,具体为,0min,甲醇15份,水85份;10min,甲醇30份,水70份;20min,甲醇100份,水0份;25min,甲醇100份,水0份;35min,甲醇15份,水85份。
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