A sensing interface for recognition of tryptophan enantiomers based on porous cluster-like nanocomposite films

作者：Guo Dongmei; Huang Yihan; Chen Cui; Chen Ya; Fu Yingzi^*

来源：New Journal of Chemistry, 2014, 38(12): 5880-5885.

DOI：10.1039/c4nj01484g

A sensing interface with porous cluster-like nanocomposite films has been fabricated by electrochemical polymerization of L-cysteine on the surface of multi-walled carbon nanotubes (PLC/MWCNTs), and it was characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The nanocomposite films have been used to interact with tryptophan enantiomers (D- and L-Trp), and an obvious difference was achieved in the oxidation peak currents between D-Trp and L-Trp, suggesting that the PLC/MWCNTs could be used as a chiral selector to discriminate the Trp enantiomers. Under the optimum conditions, D-Trp and L-Trp presented a detection limit of 33 mu M (S/N = 3), with a linear range of 1.0 x 10(-4) M to 1.0 x 10(-3) M. The simple method with rapid recognition, excellent stability and reproducibility provided a new perspective to recognize and determine Trp enantiomers.

• 出版日期2014-12
• 单位西南大学