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Multivalent aptasensor array and silver aggregated amplification for multiplex detection in microfluidic devices
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DOI：10.1016/j.talanta.2018.05.048.png)
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Abstract
En 中文
Herein, we developed a rapid and sensitive aptamers-based sandwich assay in microfluidic devices based on multivalent aptasensor array (MAA) chip and silver aggregated amplification (SAA) strategy for the detection of two biomarkers. Firstly, aptamers-modified silver nanoparticles were dotted in array to form MAA chip. Then PDMS was used to form a microfluidic device. After that, target proteins and two kinds of aptamer-modified silver nanoparticles (Tag-A and Tag-B) were rapidly injected into the microfluidic device. The aptamer on MAA chip recognized target, and the target also bound with Tag-A and Tag-B which could aggregate with each other to amplify fluorescence signal. Based on MAA chip and SAA strategy in microfluidic device, a linear response to PDGF-BB (r = 0.999) was obtained in the concentration range from 16 pg mL(-1) to 250 ng mL(-1), and the detection limit was 1.4 pg mL(-1). In addition, a linear response to PDGF-BB (r = 0.992) was obtained in the concentration range from 16 pg mL(-1) to 250 ng mL(-1) in 10% blood serum with detection limit of 7.8 pg mL(-1). Ultimately, this assay was used to simultaneously detect PDGF-BB and VEGF-165, and the results showed good specificity and sensitivity. This assay can also be expanded to sensitive and high-throughput detection of other protein biomarkers by coupling of various aptamers with nanoparticles.
Keywords:
Microfluidic
Microarray
Aptamer
Silver nanoparticles
Multiplex detection
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