固定在金纳米颗粒上的抗体结合小抗原光素的能力
Dmitriy V Sotnikov1, Nadezhda A Byzova1, Anatoly V Zherdev1
1A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia.
International journal of molecular sciences
|December 9, 2023
概括
对纳米粒子的抗体固定限制了抗原的结合,即使对于像光素这样的小分子. 结合效率取决于纳米粒子大小和表面电荷相互作用.
科学领域:
- 生物结合化学 生物结合化学
- 纳米粒子-抗体相互作用
- 生物传感器开发开发
背景情况:
- 载体上的抗体固定对于分析应用至关重要,但往往会降低抗原结合活性.
- 有限的数据存在于纳米粒子表面的抗体特性,特别是小分子抗原.
研究的目的:
- 用光素作为模型抗原,研究固定抗体对黄金纳米颗粒的结合活性.
- 评估纳米粒子大小,抗原电荷和抗体表面覆盖对结合效率的影响.
主要方法:
- 使用了不同尺寸 (14-35.5nm) 的球形金纳米粒子.
- 固定了抗体,并测试了与两个充电形式的光素的结合.
- 纳米颗粒上的各种抗体表面覆盖水平.
主要成果:
- 黄金纳米颗粒上的固定抗体显示出有限的结合能力 (6-17%的carboxyfluorescein).
- 在21纳米纳米粒子上,氨基化素的结合效率比碳氧化素 (13%) 高 (27%) .
- 减少抗体表面覆盖率并没有显著改变活性结合位点的百分比.
结论:
- 抗原与固定抗体的结合受到限制,即使是小抗原.
- 结合效率受到纳米粒子大小和表面静电排斥的影响.
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