✍ Scribed by Juanjuan Lu; Shenguang Ge; Fuwei Wan; Jinghua Yu
No coin nor oath required. For personal study only.
A novel flow injection electrochemiluminescence method combined with molecularly imprinted solid‐phase extraction was developed for the determination of L‐phenylalanine, in which ${\rm{Ru(bpy}})_3^{2 + }$ was used as the luminophor and indium tin oxide glass was modified as the working electrode. Molecularly imprinted polymers, synthesized by self‐assembly with functional monomer and crossing linker, were used for the selective extraction of L‐phenylalanine. In order to overcome the drawbacks of traditional electrochemiluminescence cells such as high IR drop, high over‐potential and so on, a novel electrochemiluminescence cell was developed. The enhanced electrochemiluminescence intensity was linearly related with the concentration of L‐phenylalanine in the range from 1.0×10^−7^ to 5.0×10^−5^ g/mL with a detection limit of 2.59×10^−8^ g/mL. The relative standard deviation for the determination of 1.0×10^−6^ g/mL L‐phenylalanine was 1.2% (n=11). The method showed higher sensitivity and good repeatability, and was successfully applied for the determination of L‐phenylalanine in egg white, chicken and serum samples. A possible mechanism for the enhanced electrochemiluminescence response on indium tin oxide glass is proposed.
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