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【学习笔记】SEC-HPLC与CE-SDS在抗体纯度分析中的比较

  • 2026-02-07 12:55:15
【学习笔记】SEC-HPLC与CE-SDS在抗体纯度分析中的比较

纯度测定是重组抗体药物的一项重要检测指标,该指标直接反映了抗体纯化工艺水平及产品质量的高低。抗体纯度的测定在一定程度上可以理解为大小异质体的分析。大小异质性一般可以分为三类,即单体、片段和多聚体。

片段包括降解的单抗和组装不完整的轻重链等;而多聚体则包括二聚体、寡聚体和更复杂的聚体

多聚体不仅可能是抗体药物中的无效成分,而且还可能是导致抗体免疫原性的重要原因之一,所以纯度测定是抗体生产工艺优化、生产过程控制以及放行分析中不可或缺的检测项目,也是抗体稳定性评价的重要指标之一。

抗体纯度的准确测定主要涉及两个方面的问题。一个是抗体分子与杂质的有效分离。在实际测定中,某些产品相关杂质,如截短或延长形式、修饰形式、多聚体等,由于性质与主蛋白比较接近,分离起来可能有困难,因此需要选用合适的分离方法。另一个是对主蛋白及杂质的高灵敏度检测和定量。常用的检测器有紫外检测器、荧光检测器、电化学检测器、质谱检测器等。为了避免一种检测方法在蛋白纯度检测中的偏差,一般选用至少两种分离方法进行检测,以得到相对准确的纯度信息。

随着技术的进步,单抗大小异质性的分析手段不断涌现,不同的分析技术其分析原理不同,所获得的结果反映单抗在大小异质性方面不同的特性。由于 SEC-HPLC及 CE-SDS相对简单易行,成为分析抗体类药物大小异质性的两种常规方法。中检院的研究人员利用非还原CE-SDS及常规(无处理)和变性(SDS和碘乙酰胺处理) SEC-HPLC评价了一种抗VEGF单抗的大小异质性,初步阐明了二者结果差异的原因,为抗体制品的质量控制研究提供了理论基础。

三种分析的结果比较如下图所示,可以看出非还原 CE-SDS的多聚体含量分析结果显著低于常规 SEC-HPLC,但与变性 SEC-HPLC的分析结果基本一致。多聚体为共价和非共价结合两种形式总和,而在 CE-SDS分析的情况下,由于去垢剂SDS的存在,非共价形式的多聚体被解离成为单体,所以多聚体的含量相比常规 SEC-HPLC明显降低。在变性 SEC-HPLC分析的情况下,由于SDS的存在,多聚体含量则与非还原CE-SDS的分析结果基本一致。所以与非还原 CE-SDS相比, SEC-HPLC可更加客观地评价样品中总多聚体的百分比含量。该研究分析的单抗样品多聚体主要是以非共价键的形式连接,所以应注意两种方法所得到的多聚体含量结果具有不同的含义,在分析多聚体含量时,常规 SEC-HPLC分析比 CE-SDS分析更加客观。

对于片段分析,由下图可以看出,非还原 CE-SDS所分析的片段比例显著大于常规和变性 SEC-HPLC,其主要原因是 SEC-HPLC的分辨率较低,无法对单体及大部分片段进行有效分离。单抗分子中往往有少部分重链和/或轻链的链间二硫键连接不完全,以非共价键与单抗其他部分相连接。而SDS可打开非共价键,所以在非还原CE-SDS分析结果中,除HHLL(全抗分子)外,还可形成HHL、HH、H、L,以及其他与单抗非共价结合的降解片段;常规 SEC-HPLC由于不能有效解离非共价结合的片段,加之其低分辨率,对片段含量的检测有一定的局限性,所以非还原 CE-SDS和SEC-HPLC二者片段峰所代表的形式并不相同。

总结起来就是,在大小异质性的聚体分析上常规 SEC-HPLC分析比 CE-SDS分析更加客观;在大小异质性的片段分析上CE-SDS分析比常规SEC-HPLC更准确。

参考文献

1.人源化抗VEGF单克隆抗体制品的大小异质性分析

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  1. CONNECT:[ UseTime:0.000464s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010263s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004434s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000849s ]
  6. SELECT * FROM `set` [ RunTime:0.000432s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000775s ]
  8. SELECT * FROM `article` WHERE `id` = 466614 LIMIT 1 [ RunTime:0.006104s ]
  9. UPDATE `article` SET `lasttime` = 1770534224 WHERE `id` = 466614 [ RunTime:0.003252s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004125s ]
  11. SELECT * FROM `article` WHERE `id` < 466614 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007791s ]
  12. SELECT * FROM `article` WHERE `id` > 466614 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003604s ]
  13. SELECT * FROM `article` WHERE `id` < 466614 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009203s ]
  14. SELECT * FROM `article` WHERE `id` < 466614 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009454s ]
  15. SELECT * FROM `article` WHERE `id` < 466614 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014066s ]
0.144391s