使用AF4-MALS确定生物颗粒的颗粒数度:取决于光散射模型和折射率
Christine L Plavchak1, Allison Z Werner2, Elizabeth Betz1
1Department of Chemistry, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, United States.
Journal of chromatography. A
|October 30, 2024
概括
使用多角度光散射 (AF4-MALS) 的非对称流域流量分成方法进行精确的生物颗粒尺寸和计数,需要仔细选择光散射模型和折射率 (RI). 这项研究量化了模型和RI对粒子计数的影响,以改善生物颗粒的表征.
科学领域:
- 生物物理学的生物物理.
- 纳米技术 纳米技术
- 分析化学 分析化学
背景情况:
- 对生物颗粒的准确量化和尺寸化在科学学科中至关重要.
- 现有的生物颗粒表征方法通常受到大小多分散性的限制,导致潜在的偏差.
- 不对称流量场流量分成与线上多角度光散射 (AF4-MALS) 是分析粒子大小和度的强大技术.
研究的目的:
- 开发和验证AF4-MALS分析工作流程,用于生物颗粒的同时分离,大小和度确定.
- 系统地评估不同多角度光散射 (MALS) 粒子计数模型和折射率 (RI) 值对粒子计数的影响.
- 通过使用AF4-MALS.建立精确的生物颗粒计数和大小的最佳实践.
主要方法:
- 使用非对称的流量场流分成 (AF4) 与线上多角度光散射 (MALS) 检测相结合.
- 开发了一个分析工作流程,以处理AF4-MALS数据,同时进行颗粒分离,大小和度确定.
- 评估了各种MALS球形和涂层球形模型以及折射率 (RI) 值对使用聚乙烯乳 (PSL) 颗粒和细菌外膜囊泡 (OMV) 的粒子计数的影响.
主要成果:
- 对于PSL和OMV的粒子计数在不同的球形MALS模型中差异很大 (分别高达13%和200%).
- 对于使用涂层球体模型分析的OMV,粒子计数对所选球体RI值高度敏感.
- 将悬浮介质的 RI 与球体 RI 值相接近,导致对信号噪声比率的灵敏度增加,从而产生错误的计数.
结论:
- 选择合适的MALS模型和RI值对于获得准确的生物颗粒颗粒数量和尺寸分布至关重要.
- 开发的AF4-MALS工作流允许分离,列举和测量多分散生物颗粒的尺寸.
- 这项研究强调了严格验证分析参数对于可靠的生物颗粒表征的重要性.
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