LSPR Biosensor Signal Enhancement Using Nanoparticle-Antibody Conjugates.

LSPR Biosensor Signal Enhancement Using Nanoparticle-Antibody Conjugates.
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LSPR生物传感器信号使用纳米颗粒 - 抗体结合物增强。

DOI:
10.1021/jp106912p
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发表时间:
2011-02-10
影响因子:
3.7
通讯作者:
Van Duyne, Richard P.
Van Duyne, Richard P.
中科院分区:
化学3区
文献类型:
--
作者:
Hall, W. Paige;Ngatia, Salome N.;Van Duyne, Richard P.

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使用金纳米颗粒标记的抗体开发了一种放大从局部表面等离子体共振(LSPR)生物测定中观察到的波长偏移的方法。该技术涉及使用金纳米颗粒缀合抗体检测表面结合的分析物,提供了一种增强LSPR位移的方法,用于更灵敏地检测低浓度分析物。使用生物素和抗生物素蛋白结合对作为模型,我们证明了抗体与分析物结合后的位移放大高达400%。此外,抗体-纳米颗粒缀合物将观察到的结合常数提高了2个数量级,并且将检测限提高了近3个数量级。这种扩增策略提供了一种提高基于等离子体的生物测定灵敏度的方法,为基于单分子的检测和临床相关诊断铺平了道路。
A method to amplify the wavelength shift observed from localized surface plasmon resonance (LSPR) bioassays is developed using gold nanoparticle-labeled antibodies. The technique, which involves detecting surface-bound analytes using gold nanoparticle conjugated antibodies, provides a way to enhance LSPR shifts for more sensitive detection of low-concentration analytes. Using the biotin and antibiotin binding pair as a model, we demonstrate up to a 400% amplification of the shift upon antibody binding to analyte. In addition, the antibody-nanoparticle conjugate improves the observed binding constant by 2 orders of magnitude, and the limit of detection by nearly 3 orders of magnitude. This amplification strategy provides a way to improve the sensitivity of plasmon-based bioassays, paving the way for single molecule-based detection and clinically relevant diagnostics.
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影响因子: 4
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