Concentration and pH-modulated dual fluorescence in self-assembled nanoparticles of phototautomerizable biopolymeric amphiphile

Title
Concentration and pH-modulated dual fluorescence in self-assembled nanoparticles of phototautomerizable biopolymeric amphiphile
Authors
임창근서장원김세훈권익찬안철희박수영
Keywords
Excited-state intramolecular proton transfer (ESIPT); Ratiometric fluorescence sensor; Fluorescent nanoparticle; pH sensor; Self-assembly; Biopolymeric conjugate
Issue Date
2011-09
Publisher
Dyes and pigments
Citation
VOL 90, NO 3, 284-289
Abstract
A dual-emissive biopolymeric amphiphile (GC-HBO) has been prepared by densely conjugating hydrophilic glycol chitosan (GC) with a phototautomerizable hydrophobic dye (a derivative of 2-(2'-hydroxyphenyl) benzoxazole, HBO) showing excited-state intramolecular proton transfer (ESIPT). Ratiometric modulation of phototautomeric (enol-keto) dual emission, governed by the chromophoric aggregation state, was studied with a low-molecular-weight model compound (GA-HBO) and was well correlated with the nanoparticleforming behavior of GC-HBO via amphiphilic self-assembly in water. It has been found that the promoted chromophoric aggregation at higher concentration or at basic-to-neutral pH assists the nanostructure formation to generate predominant keto emission while the enol emission is intensified at lower concentration or with decreasing pH by disintegration of self-assembled structure. The assembly-related advantageous potential of GC-HBO for probing self-concentration and surrounding pH has been demonstrated with the ratiometric determination of critical particulation concentration (0.04 kg m-3) and near-physiological pH sensitivity (pKa ~ 5.1).
URI
http://pubs.kist.re.kr/handle/201004/39454
ISSN
0143-7208
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KIST Publication > Article
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