目的:建立尺寸排阻色谱-示差折光-多角度激光光散射检测器联用(size exclusion chromatography-refractive index-multiangle laser light scattering,SEC-RI-MALLS)测定甘露聚糖肽原料药和制剂分子量及分子量分布的方法。方法:采用SEC-RI-MALLS联用技术,以0.05 mol·L-1硫酸钠溶液为流动相,Shodex OHpak SB-804 HQ为色谱分离柱,在流速0.5 mL·min-1,柱温35 ℃的条件下对甘露聚糖肽分子量及其分布进行专属性、准确度、精密度、耐用性方法学验证,并与现行质量标准方法进行比较。结果:片剂辅料淀粉对测定无干扰,右旋糖酐标准品实测值同标示值的准确度相对误差<3.0%;当样品配制浓度为2 mg·mL-1时精密度最好,RSD为0.40%;重现性、耐用性RSD均不大于5.0%。79批次样品采用Shodex OHpak SB-804 HQ 色谱柱和TSK-GEL G4000 PWXL色谱柱进行测定,结果无显著性差异。SEC-RI-MALLS法比甘露聚糖肽国家标准方法 (GPC法)的结果平均高19 509 Da,且分子量分布更为集中。结论:SEC-RI-MALLS法无需标准品就能够测定甘露聚糖肽分子量及其分布,结果准确,耐用性好,与现行方法相比,更有利于该品种的安全性、有效性控制。
Objective: To establish a method for determining molecular weight and distribution of raw mannatide and its preparation with SEC-RI-MALLS. Methods: Specificity,accuracy, precision and robustness of SEC-RI-MALLS method was verified by performing on a Shodex OHpak SB-804 HQ column with 0.05 mol·L-1 sodium sulfate buffer as mobile phase at a flow rate of 0.5 mL·min-1 and a comparison between SEC-RI-MALLS and GPC was studied too. Resulst: The tablet excipient starch had no interference to the test. The relative accuracy error between the measured value and the labeled value of dextran standard was less than 3.0%. RSD of precision was 0.40% when the sample concentration was 2 mg·mL-1 and the RSD of reproducibility and robustness were less than 5.0%. There was no significant difference between Shodex OHpak SB-804 HQ column and TSK-GEL G4000 PWXL column by comparing the results of 79 batches of samples. Compared with the national standard method (GPC) for molecular weight determination, the molecular weight of SEC-RI-MALLS method was 19 509 Da higher on average, and the molecular weight distribution was more concentrated. Conclusion: SEC-RI-MALLS method can determine the molecular weight and distribution of mannatide without standard with good accuracy and robustness. Compared with the existing method, SEC-RI-MALLS method is more conducive to the safety and effectiveness control of the variety.
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