Metal-containing trifurcate chemosensing ensemble for phytate
SCIE
SCOPUS
- Title
- Metal-containing trifurcate chemosensing ensemble for phytate
- Authors
- Oh, DJ; Han, MS; Ahn, KH
- Date Issued
- 2007-01
- Publisher
- TAYLOR & FRANCIS LTD
- Abstract
- A trifurcated receptor system containing three Cu(II)dipicolylamine ligands has been studied for the molecular sensing of phytate, myo-inositol hexakis(phosphate) sodium salt, through an indicator displacement approach. From the Cu(II) complex, a molecular sensing ensemble system was best constructed with eosin Y as indicator. The addition of phytate to the chemical ensemble system in an aqueous medium of physiological pH resulted in the restoration of fluorescence of eosin Y as it is displaced from the metal complex by the anion added. The ensemble system shows the maximum fluorescence change in the case of phytate, about 70% change in the cases of myo-inositol 1,4,5-tris(phosphate) and pyrophosphate ions, and negligible changes in the cases of monovalent anions (HPO42-, CH3CO2-, CO32-, Cl-, Br-, ClO4-, N-3(-), NO3-) and inositol. A binding study by isothermal titration calorimetry suggests that the Cu(II) complex tends to recognize phytate preferably in a 2: 1 binding mode with K-1 of 7.7 x 10(8) M-1, accompanied with a large favorable entropy change (T Delta S = 19.4 kcal mol(-1)) and an unfavorable enthalpy change (Delta H = 7.1 kcal mol(-1)) at 303 K. The present chemical ensemble system thus can be used for fluorescence sensing of phytate in the mu M range.
- Keywords
- phytate; ensemble sensor; Cu( II) complex; tripodal dipicolylamine; TEACHING OLD INDICATORS; PHYTIC ACID; ARTIFICIAL RECEPTORS; AQUEOUS-SOLUTION; REMARKABLE SELECTIVITY; INOSITOL HEXAPHOSPHATE; MOLECULAR RECOGNITION; SYNTHETIC RECEPTOR; VISUAL DETECTION; ENTROPY-DRIVEN
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23143
- DOI
- 10.1080/10610270701355034
- ISSN
- 1061-0278
- Article Type
- Article
- Citation
- SUPRAMOLECULAR CHEMISTRY, vol. 19, no. 39908, page. 315 - 320, 2007-01
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