Label-free detection of DNA hybridization with a compact LSPR-based fiber-optic sensor

The Analyst
Savannah KayeJianjun Wei

Abstract

A miniaturized, robust, localized surface plasmon resonance (LSPR)-coupled fiber-optic (FO) nanoprobe providing an integrated and portable solution for detection of DNA hybridization and measurement of DNA concentrations has been demonstrated. The FO nanoprobe was created by constructing arrays of metallic nanostructures on the end facets of optical fibers utilizing nanofabrication technologies, including electron beam lithography and lift-off processes. The LSPR-FO nanoprobe device offers real-time, label-free, and low-sample-volume quantification of single-strand DNA in water with high sensitivity and selectivity, achieving a limit of detection around 10 fM. These results demonstrate the feasibility of the LSPR-FO nanoprobe device as a compact and low-cost biosensor for detection of short-strand DNA.

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Citations

Apr 25, 2019·Sensors·Ariel GuerreiroJosé Manuel Baptista
Apr 1, 2020·Nanoscale·Qi Wang, Lei Wang
May 1, 2021·Biosensors·María A OrtegaJavier Ramón-Azcón
Jun 12, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Hyeong-Min KimSeung-Ki Lee
May 9, 2018·Analytical Chemistry·Mengdi LuJean-Francois Masson
Jul 4, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Xiaoqing LvHongda Chen

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