高效液相尺寸排阻色谱-多角度激光散射定量检测灭活禽流感病毒抗原中完整病毒颗粒

本研究旨在建立一种灭活禽流感病毒原料液中完整病毒颗粒准确定量的方法。针对直接采用高效液相尺寸排阻色谱法（high performance size exclusion chromatography，HPSEC）检测灭活禽流感病毒原液存在杂质干扰的问题，首先以H5N8型抗原为对象，分别考察了聚乙二醇（polyethylene glycol，PEG）沉淀和离子交换色谱法（ion exchange chromatography，IEC）进行预处理。在优化条件下，经DEAE FF阴离子交换层析纯化预处理，杂蛋白去除率为86.87%，病毒血凝回收率为100%。HPSEC分析预处理后的样品，8.5–10.0 min处色谱峰样品电泳检测显示主要为H5N8病毒蛋白，动态光散射分析平均粒径为127.7 nm，推测为完整病毒特征峰；在IEC预处理后的样品中加入抗体进行HPSEC检测，8.5-10.0 min处特征峰消失，显示IEC预处理有效去除了杂质干扰。通过将HPSEC与多角度激光散射技术（multi-angle laser scattering technique，MALLS）联用，可以准确获得样品中完整病毒颗粒的数量，且病毒颗粒数与色谱峰面积具有良好线性关系（R²=0.997）。建立的IEC预处理-HPSEC-MALLS检测方法应用于其他亚型（H7N9）、批次和浓度的病毒原液中完整病毒颗粒数的准确检测，均具有良好适用性，且重复性好，相对标准偏差（relative standard deviation，RSD）<5%，n=3。

Quantification of complete viral particles in inactivated avian influenza virus antigen by high performance size exclusion chromatography coupled with multi-angle laser light scattering

We developed a method for accurate quantification of the intact virus particles in inactivated avian influenza virus feedstocks. To address the problem of impurities interference in the detection of inactivated avian influenza virus feedstocks by direct high performance size exclusion chromatography (HPSEC), we firstly investigated polyethylene glycol (PEG) precipitation and ion exchange chromatography (IEC) for H5N8 antigen purification. Under the optimized conditions, the removal rate of impurity was 86.87% in IEC using DEAE FF, and the viral hemagglutination recovery was 100%. HPSEC was used to analyze the pretreated samples. The peak of 8.5-10.0 min, which was the characteristic adsorption of intact virus, was analyzed by SDS-PAGE and dynamic light scattering. It was almost free of impurities and the particle size was uniform with an average particle size of 127.7 nm. After adding antibody to the IEC pretreated samples for HPSEC detection, the characteristic peak disappeared, indicating that IEC pretreatment effectively removed the impurities. By coupling HPSEC with multi-angle laser scattering technique (MALLS), the amount of intact virus particles in the sample could be accurately quantified with a good linear relationship between the number of virus particles and the chromatographic peak area (R²=0.997). The established IEC pretreatment-HPSEC-MALLS assay was applied to accurate detection of the number of intact virus particles in viral feedstocks of different subtypes (H7N9), different batches and different concentrations, all with good applicability and reproducibility, Relative standard deviation<5%, n=3.