Abstract：
:Liquid crystals (LCs) have been applied for a long time in the field of analytical chemistry. To date, there are no reports about utilization of LCs as the catalyst to amplification analytical signal. In this article, three small molecules LCs in water aqueous solutions were characterized using molecular spectra and particle size analysis. The characterization indicated that there are nanoparticles in the system. Among the them, 4-heptylbenzoic acid (HPB) exhibits the most sensitive performance in the analytical system based on the reduction of HAuCl4 to gold nanoparticles (AuNPs) by NaH2PO2 by the spectrophotometric slope evaluation procedure. As the concentration of LCs catalyst increases, the AuNPs surface plasmon resonance (SPR) absorption peak at 550 nm increases linearly, that can be utilized to amply the absorption signal. Based on the LCs catalytic amplification reaction and immunoreaction, a new SPR spectrophotometric analysis method was developed for the label-free detection of oxytetracycline, with a detection limit of 0.50 ng/mL. The method was also successfully applied for the detection of oxytetracycline-spiked environmental water samples to demonstrate its practical usefulness.
journal_name
Talantajournal_title
Talantaauthors
Huang H,Li J,Pan S,Wang H,Liang A,Jiang Zdoi
10.1016/j.talanta.2021.122528keywords:
["4-Heptylbenzoic acid","Aptamer","Liquid crystal catalytic amplification","Nanogold SPR absorption","Oxytetracycline"]subject
Has Abstractpub_date
2021-10-01 00:00:00pages
122528eissn
0039-9140issn
1873-3573pii
S0039-9140(21)00449-5journal_volume
233pub_type
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