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Amplified fluorescence quenching and biosensor application of a poly(para-phenylene) cationic polyelectrolyte

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The quenching behavior of a water-soluble cationic poly(para-phenylene) bearing quaternized ammonium side groups (P-NEt+3) was studied. P-NEt+3 is efficiently quenched by sodium anthraquinone-2,6-disulfonate (AQS) and sodium 1,4,5,8-naphthalenediimide-N, N′-bis(methyl-sulfonate) (NDS) in aqueous solution via a photo-induced electron-transfer mechanism. Absorption spectra of the NDS/P-NEt+3 ion-pair complex indicated formation of a stable charge-transfer complex in the ground state. A large spectral shift and band broadening occurred during AQS/P-NEt+3 complex formation, which is believed to arise due to P-NEt+3 conformational changes induced by hydrophobic interactions. Finally, a protein sensor that relies on the quenching behavior of P-NEt+3 was designed based on the quencher-tether-ligand (QTL) approach. AQS tethered to biotin (AQS-E-Biotin) was used along with P-NEt+3 to sense avidin.


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