Water-soluble phosphate-functionalized polyfluorene as fluorescence biosensors toward cytochrome c |
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Authors: | ChuanJiang Qin Hui Tong and LiXiang Wang |
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Institution: | (1) State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China |
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Abstract: | An anionic water-soluble polyfluorene derivative, poly(9,9-bis(6′-phosphatehexyl)fluorene-alt-1,4-phenylene) sodium salt (PFHPNa), was synthesized by Suzuki coupling reaction in DMF/water. Polymer PFHPNa was well soluble
in water with a strong blue fluorescence emission. Effect of the side chain length on fluorescence sensory properties was
studied by comparing quenching efficiencies toward different quenchers of PFHPNa with a reported polymer poly(9,9-bis(3′-phosphatepropyl)fluorene-alt-1,4-phenylene) sodium salt (PFPPNa), which have different side chains in length. For small molecular quenchers (methylviologen,
MV2+) and meso-5,10,15,20-tetrakis-(N-methyl-4-pyridyl)porphine (TMPyP4), polymer PFHPNa had lower sensitivity due to the much longer side chain length. The positively
charged metalloprotein cytochrome c could quench fluorescence of conjugated polymers via energy transfer and electron transfer. Moreover, polymer PFHPNa showed
higher fluorescence quenching toward large biomolecules than PFPPNa. The corresponding Stern-Volmer (K
sv) value of polymer PFHPNa was determined to be 2.1×108 M−1 for cytochrome c. It could be used as a sensitive and selective fluorescence sensor for protein cytochrome c.
Supported by the National Natural Science Foundation of China (Grant Nos. 20574067 & 50633040), the Science Fund for Creative
Research Groups (Grant No. 20621401), and the 973 Project (Grant No. 2002CB613402) |
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Keywords: | conjugated polymer fluorescence sensor water-soluble side chain |
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