Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10536334 | Analytical Biochemistry | 2005 | 9 Pages |
Abstract
A piezoelectric sensor coated with a thin molecularly imprinted sol-gel film has been developed for the determination of l-histidine in the liquid phase. Without preprotection, l-histidine was imprinted directly into silica sol-gel films that consisted of a hybrid mixture of functionalized organosilicon precursors (phenyltrimethoxysilane and methyltrimethoxysolane). The viscoelasticity of the film in the air and in buffer solution has been studied by the piezoelectric quartz crystal impedance technique. The binding of l-histidine to the imprinted film in the liquid phase was investigated by the piezoelectric microgravimetry and electrochemical impedance technique. Scatchard analysis showed that the maximum binding site (Qmax) of the l-histidine imprinted sol-gel film is about 23.7 μmol/g. A linear range from 5.0 Ã 10â8 to 1.0 Ã 10â4 M for a detection of l-histidine has been observed with a detection limit of 2.5 Ã 10â8 M for S/N = 3. The proposed imprinted sol-gel sensor exhibits good stability, high specificity, and excellent stereoselectivity.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Zhaohui Zhang, Haiping Liao, Hui Li, Lihua Nie, Shouzhuo Yao,