Multiplex Paper-Based Colorimetric DNA Sensor Using Pyrrolidinyl Peptide Nucleic Acid-Induced AgNPs Aggregation for Detecting MERS-CoV, MTB, and HPV Oligonucleotides.
Anal Chem 2017;
89:5428-5435. [PMID:
28394582 PMCID:
PMC7077925 DOI:
10.1021/acs.analchem.7b00255]
[Citation(s) in RCA: 196] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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The development of simple fluorescent
and colorimetric assays that
enable point-of-care DNA and RNA detection has been a topic of significant
research because of the utility of such assays in resource limited
settings. The most common motifs utilize hybridization to a complementary
detection strand coupled with a sensitive reporter molecule. Here,
a paper-based colorimetric assay for DNA detection based on pyrrolidinyl
peptide nucleic acid (acpcPNA)-induced nanoparticle aggregation is
reported as an alternative to traditional colorimetric approaches.
PNA probes are an attractive alternative to DNA and RNA probes because
they are chemically and biologically stable, easily synthesized, and
hybridize efficiently with the complementary DNA strands. The acpcPNA
probe contains a single positive charge from the lysine at C-terminus
and causes aggregation of citrate anion-stabilized silver nanoparticles
(AgNPs) in the absence of complementary DNA. In the presence of target
DNA, formation of the anionic DNA-acpcPNA duplex results in dispersion
of the AgNPs as a result of electrostatic repulsion, giving rise to
a detectable color change. Factors affecting the sensitivity and selectivity
of this assay were investigated, including ionic strength, AgNP concentration,
PNA concentration, and DNA strand mismatches. The method was used
for screening of synthetic Middle East respiratory syndrome coronavirus
(MERS-CoV), Mycobacterium tuberculosis (MTB), and human papillomavirus (HPV) DNA based on a colorimetric
paper-based analytical device developed using the aforementioned principle.
The oligonucleotide targets were detected by measuring the color change
of AgNPs, giving detection limits of 1.53 (MERS-CoV), 1.27 (MTB),
and 1.03 nM (HPV). The acpcPNA probe exhibited high selectivity for
the complementary oligonucleotides over single-base-mismatch, two-base-mismatch,
and noncomplementary DNA targets. The proposed paper-based colorimetric
DNA sensor has potential to be an alternative approach for simple,
rapid, sensitive, and selective DNA detection.
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