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Complete Molecular Weight Profiling of Low-Molecular Weight Heparins Using Size Exclusion Chromatography-Ion Suppressor-High-Resolution Mass Spectrometry

机译:使用尺寸排阻色谱-离子抑制器-高分辨率质谱法对低分子量肝素进行完整的分子量分析

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摘要

Low-molecular weight heparins (LMWH) prepared by partial depolymerization of unfractionated heparin are used globally to treat coagulation disorders on an outpatient basis. Patent protection for several LMWH has expired and abbreviated new drug applications have been approved by the Food and Drug Administration. As a result, reverse engineering of LMWH for biosimilar LMWH has become an active global endeavor. Traditionally, the molecular weight distributions of LMWH preparations have been determined using size exclusion chromatography (SEC) with optical detection. Recent advances in liquid chromatography–mass spectrometry methods have enabled exact mass measurements of heparin saccharides roughly up to degree-of-polymerization 20, leaving the high molecular weight half of the LMWH preparation unassigned. We demonstrate a new LC–MS system capable of determining the exact masses of complete LMWH preparations, up to dp30. This system employed an ion suppressor cell to desalt the chromatographic effluent online prior to the electrospray mass spectrometry source. We expect this new capability will impact the ability to define LMWH mixtures favorably.
机译:通过普通肝素的部分解聚制备的低分子量肝素(LMWH)在门诊患者中广泛用于治疗凝血障碍。几种LMWH的专利保护已经过期,新药申请的缩写已获得美国食品药品管理局的批准。结果,针对生物仿制LMWH的LMWH的逆向工程已经成为全球活跃的努力。传统上,LMWH制剂的分子量分布是使用具有光学检测功能的尺寸排阻色谱法(SEC)确定的。液相色谱-质谱法的最新进展已使肝素糖的精确质量测量达到了聚合度,最高可达20,而LMWH制剂中高分子量的一半尚未分配。我们展示了一种新的LC-MS系统,该系统能够确定高达dp30的完整LMWH制剂的精确质量。该系统在电喷雾质谱分析源之前,采用了离子抑制池在线对色谱流出物进行脱盐处理。我们希望这项新功能将对定义LMWH混合物的功能产生有利影响。

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