Liquid Crystal@Nanosilver Catalytic Amplification—Aptamer Trimode Biosensor for Trace Pb2

Liquid crystals (LCs) are a very important display material. However, the use of LC, especially LC-loaded nanoparticles, as a catalyst to amplify the analytical signal and coupled with specific aptamer (Apt) as a recognition element to construct a highly sensitive and selective three-mode molecular...

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Bibliographic Details
Published in:International journal of molecular sciences 2023-02, Vol.24 (3), p.2920
Main Authors: Shu, Yiyi, Li, Sha, Li, Chongning, Liang, Aihui, Jiang, Zhiliang
Format: Article
Language:English
Subjects:
AgNPs trimode indicator reaction
aptamer
Aptamers
Arsenic ions
Benzoates
Benzoic acid
Biosensors
Carbon
Catalysis
Catalysts
Crystals
Enzymes
Gold
inorganic pollutants
LC@AgNP catalytic amplification
Liquid crystals
Methods
Molecular spectroscopy
Nanomaterials
Nanoparticles
Pesticides
Pollutants
Polyethylene glycol
Raman spectra
Rayleigh scattering
Resonance absorption
Resonance scattering
Scientific imaging
Sensors
Silver
Spectroscopy
Surface plasmon resonance
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Summary:Liquid crystals (LCs) are a very important display material. However, the use of LC, especially LC-loaded nanoparticles, as a catalyst to amplify the analytical signal and coupled with specific aptamer (Apt) as a recognition element to construct a highly sensitive and selective three-mode molecular spectral assay is rarely reported. In this article, five LCs, such as cholesteryl benzoate (CB), were studied by molecular spectroscopy to indicate the liquid crystal nanoparticles in the system, and highly catalytic and stable CB loaded-nanosilver (CB@AgNPs) sol was prepared. The slope procedure was used to study the catalysis of the five LCs and CB@AgNPs on the new indicator reaction between AgNO3 and sodium formate (Fo) to produce silver nanoparticles (AgNPs) with a strong surface plasmon resonance absorption (Abs) peak at 450 nm, a resonance Rayleigh scattering (RRS) peak at 370 nm and a surface enhanced Raman scattering (SERS) peak at 1618 cm−1 in the presence of molecular probes. By coupling the new CB@AgNPs catalytic indicator reaction with the Apt reaction, a new CB@AgNPs catalytic amplification-SERS/RRS/Abs trimode biosensoring platform was constructed for detecting inorganic pollutants, such as Pb2+, Cd2+, Hg2+ and As3+.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms24032920