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Issue 1, 2017
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Selection of aptamers based on a protein microarray integrated with a microfluidic chip

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Abstract

We developed an efficient and fast method based on a protein microarray integrated with a microfluidic chip for the process of SELEX (systematic evolution of ligands by exponential enrichment). Lactoferrin from bovine milk was used as a target protein, while bovine serum albumin (BSA), α-lactalbumin, β-lactoglobulin and casein were used as negative proteins. They were separately dotted and immobilized to prepare the protein microarray and the resulting microarray was further integrated into a microfluidic chip for the SELEX (PMM–SELEX) process. The interaction between aptamer candidates and targets could be monitored using a fluorescence microarray scanner and the whole PMM–SELEX process was performed through seven-round selection. As a result, five aptamers (Lac-14, Lac-6a, Lac-9, Lac-5, Lac-3a) with high specificity and affinity can be repeatedly obtained during three times of independent repeated selection. Surface plasmon resonance (SPR) was used to calculate the dissociation constants (Kd). The aptamer Lac-6a was then used for detection of lactoferrin by fluorescence polarization. A linear response was observed for lactoferrin concentrations in the range of 0.78–50 μg mL−1 and the detection limit was 0.39 μg mL−1. Thus, the innovative PMM–SELEX presented shows stability, accuracy and high efficiency for aptamer screening.

Graphical abstract: Selection of aptamers based on a protein microarray integrated with a microfluidic chip

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Publication details

The article was received on 26 Sep 2016, accepted on 17 Nov 2016 and first published on 17 Nov 2016


Article type: Paper
DOI: 10.1039/C6LC01208F
Lab Chip, 2017,17, 178-185

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    Selection of aptamers based on a protein microarray integrated with a microfluidic chip

    X. Liu, H. Li, W. Jia, Z. Chen and D. Xu, Lab Chip, 2017, 17, 178
    DOI: 10.1039/C6LC01208F

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