期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 181, 期 -, 页码 850-857出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.02.079
关键词
Pyroglutamic acid; Chiral recognition; Photonic crystal; Molecular imprinting technique
资金
- National Natural Science Foundation of China [20705023]
The incorporation of molecularly imprinted materials into photonic crystals presents an ideal sensing platform on which analyte recognition and analyte-dependent transduction methodology could be realized simultaneously. Here, a colorimetric molecularly imprinted photonic polymer (MIPP) sensor has been developed for the sensitive and selective chiral recognition of amino acids. The sensor was fabricated by infiltrating a polystyrene photonic crystal template with precursor and imprinting molecules, followed by a thermal polymerization. After removal of templates, the resulted MIPP consists of a three-dimensional, highly-ordered and interconnected macroporous array. The amino acids recognition events thus could be directly transferred into visible color changes and readable optical signals through the diffraction peak shifts of MIPP. A function relationship was found between the diffraction peak shift and the concentration of L-pyroglutamic acid (L-Pga) in the range of 0.01-0.50 mM at pH 4, and a linear relationship with a slope of 278 nm/mM was found when the concentration of L-Pga was lower than 0.20 mM. The chiral recognition process accompanying with a gradual color change of MIPP can be easily visualized by the naked eye. The developed method has been applied to detect L-Pga in monosodium glutamate samples. (c) 2013 Elsevier B.V. All rights reserved.
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