Molecularly Imprinted Photonic Hydrogels as Colorimetric Sensors for Rapid and Label-free Detection of Vanillin
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- 作者：Hailong Peng ; Shenqi Wang ; Zhong Zhang ; Hua Xiong ; Jinhua Li ; Lingxin Chen ; Yanbin Li
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：February 29, 2012
- 年：2012
- 卷：60
- 期：8
- 页码：1921-1928
- 全文大小：514K
- 年卷期：v.60,no.8(February 29, 2012)
- ISSN：1520-5118
文摘
A novel colorimetric sensor for the rapid and label-free detection of vanillin, based on the combination of photonic crystal and molecular imprinting technique, was developed. The sensing platform of molecularly imprinted photonic hydrogel (MIPH) was prepared by a noncovalent and self-assembly approach using vanillin as a template molecule. Morphology characterization by scanning electron microscope (SEM) showed that the MIPH possessed a highly ordered three-dimensional (3D) macroporous structure with nanocavities. The vanillin recognition events of the created nonocavities could be directly transferred into readable optical signals through a change in Bragg diffraction of the ordered macropores array of MIPH. The Bragg diffraction peak shifted from 451 to 486 nm when the concentration of the vanillin was increased from 10鈥?2 to 10鈥? mol L鈥? within 60 s, whereas there were no obvious peak shifts for methyl and ethyl vanillin, indicating that the MIPH had high selectivity and rapid response for vanillin. The adsorption results showed that the hierarchical porous structure and homogeneous layers were formed in the MIPH with higher adsorption capacity. The application of such a label-free sensor with high selectivity, high sensitivity, high stability, and easy operation might offer a potential method for rapid real-time detection of trace vanillin.