Analyte-Induced Aggregation of a Water-Soluble Conjugated Polymer for Fluorescent Assay of Oxalic Acid
✍ Scribed by Huan Sun; Fude Feng; Minghui Yu; Shu Wang
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 217 KB
- Volume
- 28
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
An assay method has been developed to detect oxalic acid from other structurally similar dicarboxylic acids using a cationic polythiophene derivative (PFT). Upon adding oxalic acid, the PFT can be cross‐linked through the bifunctional diacids of oxalic acid to form tense interpolymer π‐stacking aggregation, which results in the fluorescence self‐quenching of the PFT. Upon adding other dicarboxylic acids with a longer tether, loose interpolymer π‐stacking aggregation forms and the PFT fluorescence is less quenched. The fluorescence analysis was carried out in solution for the aggregates prior to precipitation. As a result of the short tether of oxalic acid, the unique fluorescent response from the PFT/oxalic acid assembly can be used to detect oxalic acid.
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