Direct electrochemical reduction of graphene oxide and its application to determination of l-tryptophan and l-tyrosine

. [Display omitted] ► Electrochemically reduced graphene oxide (ERGO) was prepared by potentiostatic method. ► ERGO have highly catalytic activity towards the l-tryptophane and l-tyrosine. ► ERGO was used for determination of l-tryptophane and l-tyrosine. Directly electrochemically reduced graphene...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2013-01, Vol.101 (1), p.183-188
Main Authors: Deng, Ke-Qin, Zhou, Jian-hong, Li, Xiao-Fang
Format: Article
Language:English
Subjects:
ascorbic acid
Ascorbic Acid - chemistry
Buffers
colloids
detection limit
Direct electrochemical reduction
Electrochemistry
Electrodes
glassy carbon electrode
Graphene oxide
Graphite - chemistry
Indicators and Reagents
Reproducibility of Results
Spectrum Analysis, Raman
Tryptophan
Tryptophan - analysis
Tyrosine
Tyrosine - analysis
uric acid
Uric Acid - chemistry
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Summary:. [Display omitted] ► Electrochemically reduced graphene oxide (ERGO) was prepared by potentiostatic method. ► ERGO have highly catalytic activity towards the l-tryptophane and l-tyrosine. ► ERGO was used for determination of l-tryptophane and l-tyrosine. 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 0.2–40.0μmolL−1and 0.5–80.0μmolL−1, detection limits of 0.1μmolL−1 and 0.2μmolL−1, respectively.
ISSN:0927-7765
1873-4367
DOI:10.1016/j.colsurfb.2012.06.007