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Updated: Feb 16, 2026

Synthesis of Aptamer-PEI-g-PEG Modified Gold Nanoparticles Loaded with Doxorubicin for Targeted Drug Delivery
Published on: June 23, 2020
Aminolated and Thiolated PEG-Covered Gold Nanoparticles with High Stability and Antiaggregation for Lateral Flow
Li-Kai Lin1, Aytekin Uzunoglu1, Lia A Stanciu1
1School of Materials Engineering, Neil Armstrong Hall of Engineering Purdue University, 701 West Stadium Avenue, West Lafayette, IN, 47907-2045, USA.
Abstract:
The few lateral flow assays (LFAs) established for detecting the endocrine disrupting chemical bisphenol A (BPA) have employed citrate-stabilized gold nanoparticles (GNPs), which have inevitable limitations and instability issues. To address these limitations, a more stable and more sensitive biosensor is developed by designing strategies for modifying the surfaces of GNPs with polyethylene glycol and then testing their effectiveness and sensitivity toward BPA in an LFA. Without the application of any enhancement strategy, this modified BPA LFA can achieve a naked-eye limit of detection (LOD) of 0.8 ng mL-1 , which is 12.5 times better than the LOD of regular BPA LFAs, and a quantitative LOD of 0.472 ng mL-1 . This modified LFA has the potential to be applied to the detection of various antigens.
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