Details

Autor(en) / Beteiligte

• Yang, Xing
• Niu, Xiaohui
• Mo, Zunli
• Guo, Ruibin
• Liu, Nijuan
• Zhao, Pan
• Liu, Zhenyu

Titel

Perylene-functionalized graphene sheets modified with chitosan for voltammetric discrimination of tryptophan enantiomers

Ist Teil von

• Mikrochimica acta (1966), 2019-06, Vol.186 (6), p.333-333, Article 333

Ort / Verlag

Vienna: Springer Vienna

Erscheinungsjahr

2019

Quelle

MEDLINE

Beschreibungen/Notizen

• A composite was prepared from graphene functionalized with 3,4,9,10-perylene tetracarboxylic acid and chitosan (rGO-PTCA-chitosan) by a chemical method. It involves non-covalent functionalization of rGO with PTCA followed by amidation reaction with chitosan. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and electrochemical methods were used to characterize the composites. By combining the chiral features of chitosan and the excellent electrochemical behaviors of rGO-PTCA, a graphene-based material with enantioselectivity was constructed for electrochemical chiral recognition of tryptophan (Trp) enantiomers. A glassy carbon electrode (GCE) modified with rGO-PTCA-chitosan had a higher recognition capability for L-Trp than for D-Trp. Best operated at a working voltage near 0.78 V (vs. SCE), the enantioselectivity coefficient is 3.0. The sensor has a linear response in the 1 mM to 10 mM Trp concentration range and a 1.2 μM detection limit (at S/ N  = 3) for L-Trp, and of 3.0 μM to D-Trp. The sensor was successfully used to detect Trp enantiomers in real samples, and a recognition mechanism is presented. Graphical abstract Schematic presentation of a composoie prepared by graphene functionalized with 3,4,9,10-perylene tetracarboxylic acid and chitosan (rGO-PTCA-chitosan) via a chemical method. It involves non-covalent functionalization of rGO with PTCA followed by amidation reaction with chitosan and voltammetric determination of tryptophan enantiomers.