Syntheses of chitin-based imprinting polymers and their binding properties for cholesterol |
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Authors: | Tong Yuejin Guan Huaimin Wang Shaofeng Xu Jianwei He Chaobin |
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Affiliation: | aCollege of Chemistry and Materials Science, Fujian Normal University, Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China;bInstitute of Materials Research and Engineering, A∗STAR, Singapore 117602, Singapore |
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Abstract: | A novel chitin derivative, cholesteryl chitin carbonate (Chitin-Chol), was synthesized from chitin and cholesteryl chloroformate. This product was characterized by Fourier transform infrared (FTIR) spectroscopy and solid-state 13C nuclear magnetic resonance (13C NMR), and was used as a covalently bound template precursor for imprinting cholesterol. After cross-linking with toluene 2,4-diisocyanate, it was efficiently cleaved hydrolytically to afford a guest-binding site accompanying the easy and efficient removal of a sacrificial spacer. The selectivity and efficacy of a chitin-based imprinting polymer for steroid binding were assessed by a chromatographic screening process. The results of binding experiments showed that this molecular imprinting polymer (MIP) has a high binding capacity with cholesterol. The target discrimination towards cholesterol over its close structural analogue suggested that the polymer recognition site was possible on the basis of the inversion of configuration of a single hydroxyl group. In addition, non-covalent imprinting was done using chitin as a precursor and its binding properties for cholesterol were also evaluated. |
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Keywords: | Cholesteryl chitin carbonate Cholesterol Sacrificial spacer method Non-covalent imprinting |
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