Portable Paper-based Colorimetric Nanoprobe for the Detection of Stachybotrys Chartarum Using Peptide Labeled Magnetic Nanoparticles

Overview

Journal Mikrochim Acta

Specialties Biotechnology
Chemistry

Date 2019 Mar 10

PMID 30850897

Citations 4

Authors

Ghadeer A R Y Suaifan

Mohammed Zourob

Affiliations

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Abstract

A colorimetric assay is presented for the detection of Stachybotrys chartarum proteases as biomarkers. The assay comprises a gold film acting as solid support and carrying an immobilized peptide substrate that is specific for S. chartarum protease. The substrate was conjugated to black magnetic nanoparticles (MNPs) to form a monolayer on the gold film. Hence, detection nanoprobe is black. If, however, the peptide-MNP fragments are cleaved by S. chartarum proteases present in a sample, the golden color of the detecting nanoprobe becomes apparent so that positive visual readout is enabled. The method was applied to the determination of S. chartarum in (spiked) environmental samples. The limit of detection ranges from 10 to 100 spores·mL depending on the kind of sample (culture, dust, mold and soil). Assay specificity was examined for Aspergillus flavus, Fusarium solani. Penicillin chrysogenum, and Saccharomyces cerevisiae, and negative readouts were observed visually for all samples, except for those also containing S. chartarum. Graphical abstract Schematic presentation of S. chartarum colorimetric nanoprobe.

Citing Articles

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The Efficiency of Color Space Channels to Quantify Color and Color Intensity Change in Liquids, pH Strips, and Lateral Flow Assays with Smartphones.

Nelis J, Bura L, Zhao Y, Burkin K, Rafferty K, Elliott C Sensors (Basel). 2019; 19(23).

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