生物大分子在共价表面固定后的物理变化
Bianca Mercado Velez1,2, Vaishali Sharma1,2, Seth Kriz2,3
1Department of Biological Sciences, Michigan Technological University, Houghton, Michigan 49931, United States.
Langmuir : the ACS journal of surfaces and colloids
|March 12, 2026
概括
表面化学显著影响生物大分子在固定过程中的变形. 与PLL/GA相比,NHS/EDC化学会导致更多的颗粒平坦化,特别是对于更软的外体和包裹病毒.
科学领域:
- 生物材料科学 生物材料科学
- 纳米技术 纳米技术
- 表面化学 表面化学
背景情况:
- 生物大分子的固定是分析的关键,但可以改变它们的结构.
- 了解固定化如何影响粒子形态对于准确的表征至关重要.
研究的目的:
- 调查不同表面化学物质对外体和病毒颗粒在固定过程中的变形的影响.
- 使用原子力显微镜 (AFM) 量化形态变化,并将它们与表面化学相关联.
主要方法:
- 使用NHS/EDC和PLL/GA化学的固定外体 (HEK-293,MDA-MB-231) 和病毒 (SuHV,XmuLV,PPV).
- 通过AFM图像的高度对直径 (H/D) 比率量化粒子变形.
- 使用动态光散射 (DLS) 和传输电子显微镜 (TEM) 进行补充分析.
主要成果:
- 与PLL/GA相比,NHS/EDC化学在所有生物大分子中诱导了更大的颗粒平坦化 (较低的H/D比率).
- 更柔软的外体体表现出比刚性病毒更平坦的表现.
- 瘤衍生的外体显示出比非瘤衍生的外体更大的平.
- 包裹病毒与NHS/EDC平坦化,而非包裹PPV显示聚合.
结论:
- 表面的化学作用极大地影响了生物大分子在固定过程中的变形.
- 与PLL/GA相比,NHS/EDC更容易导致平整.
- 这些发现指导了纳米级生物界面应用,诊断和生物传感的固定化学品的选择.
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