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Reference type: Journal
Authors: Lai EPC, Yang Y
Article Title: Optimization of Molecularly Imprinted Polymer Method for Rapid Screening of 17β-Estradiol in Water by Fluorescence Quenching.
Publication date: 2011
Journal: International Journal of Analytical Chemistry
Volume: 2011
Page numbers: Article ID 214747.
DOI: 10.1155/2011/214747
Alternative URL: http://www.hindawi.com/journals/ijac/aip/214747/

Abstract: A new method was optimized for rapid screening of 17β-estradiol (E2) in water under 10 min. Molecularly imprinted polymer (MIP) particles (32525 nm) were added in a water sample at pH 5.5 and 20oC to form a suspension. Fluorescence emission from E2 non-specifically bound onto the MIP particles was first quenched by large gold nanoparticles (435 nm). The Stern-Volmer plot was linear, with dynamic quenching constants (Ksv) of 2.9104 M-1. Fluorescence emission from E2 specifically bound inside the MIP particles was next quenched by small nitrite anions that easily penetrated the imprinted cavities. The Stern-Volmer plot 16 became non-linear, with Ksv=2.1x10 2 M-1 and static quenching constant (V) below 1.0 M-1. The difference between these two emission intensities varied as the initial E2 concentration in water, generating a Scatchard calibration curve with R2 >0.97 from 0.1 to 10 ppb.
Template and target information: 17β-estradiol, E2
Author keywords: 17β-estradiol, MIP particles, fluorescence quenching, rapid method, water analysis


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