Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
Nanobiotechnology and Nanobiomaterials Research Laboratory, School of Materials Science and Innovation, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
Biosensors (Basel). 2021 Jun 26;11(7):209. doi: 10.3390/bios11070209.
The sensitivity and reproducibility of the lateral flow assay can be influenced by multiple factors, such as the size of gold nanoparticles (GNPs) employed. Here, we evaluated the analytical performance of single-sized and mixed-sized GNPs using a simple lateral flow assay (LFA) platform. This platform was used as a model assay to diagnose albumin levels and demonstrate the analytical performance of single-sized and mixed-sized GNPs in LFA tests. Two sizes of GNPs@anti-bovine serum albumin (BSA) conjugate proteins were mixed at different ratios. The unique optical properties of the GNPs induced a distinguishing color-shedding effect on the single- and mixed-sized GNPs@anti-BSA conjugates interacting with the target analyte BSA spotted on the test line. The use of mixed-sized GNPs@anti-BSA conjugates enhanced signal relative to the 20 nm GNPs, and provided superior stability compared with solely employing the large GNPs (50 nm). The proposed platform in this study could provide an efficient BSA detection mechanism that can be utilized as a model biomarker for confronting chronic kidney disease.
金纳米颗粒(GNPs)的尺寸等多种因素会影响侧向流动检测法的灵敏度和重现性。在此,我们使用简单的侧向流动检测法(LFA)平台评估了单分散和混合尺寸 GNPs 的分析性能。该平台被用作模型检测法,用于诊断白蛋白水平,并展示单分散和混合尺寸 GNPs 在 LFA 检测中的分析性能。两种尺寸的 GNPs@抗牛血清白蛋白(BSA)缀合物蛋白以不同比例混合。GNPs 的独特光学特性在单分散和混合尺寸 GNPs@抗 BSA 缀合物与检测线上点样的靶标分析物 BSA 相互作用时引起了明显的颜色褪去效应。与使用 20nm GNPs 相比,混合尺寸 GNPs@抗 BSA 缀合物增强了信号,并且与仅使用大尺寸 GNPs(50nm)相比,提供了更好的稳定性。本研究中提出的平台可以提供一种有效的 BSA 检测机制,可用作应对慢性肾病的模型生物标志物。
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