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Bio-electrostatic sensitive droplet lasers for molecular detection

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Abstract

Electrostatics plays a critical function in most biomolecules, therefore monitoring molecular electrostatic interactions at the biointerface can provide the basis in diagnosis and biomedical science. Herein we report a bioelectrostatic responsive microlaser based on liquid crystal (LC) droplets and explored its application for the ultrasensitive detection of negatively charged biomolecules. A whispering gallery mode (WGM) laser from positively charged LC microdroplets was designed as the optical resonator, in which the lasing wavelength shift was employed as the sensing parameter. We verified that molecular electrostatic changes at the biointerface of the droplet trigger a wavelength shift in laser spectra. Compared to a conventional polarized optical microscope, a significantly improved sensitivity and dynamic range by four orders of magnitude were achieved. Our results helped discover that the surface-to-volume ratio plays a critical role in the detection sensitivity in WGM laser-based microsensors. Finally, bovine serum albumin and specific biosensing were exploited to demonstrate the potential applications of microlasers with a detection limit in the order of 1 pM, thus offering new alternatives for ultrasensitive label-free biosensing and monitoring of molecular interactions.

Graphical abstract: Bio-electrostatic sensitive droplet lasers for molecular detection

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Supplementary files

Article information


Submitted
08 Feb 2020
Accepted
18 May 2020
First published
19 May 2020

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Communication

Bio-electrostatic sensitive droplet lasers for molecular detection

Z. Wang, Y. Zhang, X. Gong, Z. Yuan, S. Feng, T. Xu, T. Liu and Y. Chen, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/D0NA00107D

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