Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 101, Issue -, Pages 183-188Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2012.06.007
Keywords
Graphene oxide; Direct electrochemical reduction; Tryptophan; Tyrosine
Funding
- National Natural Science Foundation of China [2097104]
- Key Project of Chinese Ministry of Education [210146]
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Directly electrochemically reduced graphene oxide (ERGO) was obtained by potentiostatic reduction of exfoliated graphene oxide sheets on a glassy carbon electrode (GCE). The ERGO-modified electrode (ERGO/GCE) displayed greatly improved voltammetric response to the amino acids L-tryptophane (Trp) and L-tyrosine (Tyr) compared with the chemically reduced graphene oxide (CRGO) modified electrode. The ERGO/GCE separated the voltammetric responses of ascorbic acid (AA) and uric acid (UA) from that of Trp and Tyr. It eliminated the interference from AA and UA. The electrode showed good reproducibility and was used to determine Trp and Tyr with linear ranges of 0.2-40.0 mu mol L-1 and 0.5-80.0 mu mol L-1, detection limits of 0.1 mu mol L-1 and 0.2 mu mol L-1, respectively. (C) 2012 Elsevier B.V. All rights reserved.
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