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New Essential Amino Acids Findings from Northwest Normal University Discussed

May 30, 2014

By a News Reporter-Staff News Editor at Science Letter -- Current study results on Essential Amino Acids have been published. According to news reporting originating in Lanzhou, People's Republic of China, by NewsRx journalists, research stated, "A new type of tryptophan-functionalized graphene nanocomposite (Trp-GR) was synthesized by utilizing a facile ultrasonic method via pi-pi conjugate action between graphene (GR) and tryptophan (Trp) molecule. The material as prepared had well dispersivity in water and better conductivity than pure GR."

The news reporters obtained a quote from the research from Northwest Normal University, "The surface morphology of Trp-GR was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The electrochemical behaviors of ascorbic acid (AA), dopamine (DA), and uric acid (UA) were investigated by cyclic voltammetry (CV) on the surface of Trp-GR. The separation of the oxidation peak potentials for AA-DA, DA-UA and UA-AA was about 182 mV, 125mV and 307 mV, which allowed simultaneously determining AA, DA, and UA. Differential pulse voltammetery (DPV) was used for the determination of AA, DA, and UA in their mixture. Under optimum conditions, the linear response ranges for the determination of AA, DA, and UA were 0.2-12.9 mM, 0.5-110 mu M, and 10-1000 mu M, with the detection limits (S/N= 3) of 10.09 mu M, 0.29 mu M and 1.24 mu M, respectively."

According to the news reporters, the research concluded: "Furthermore, the modified electrode was investigated for real sample analysis."

For more information on this research see: Simultaneous determination of ascorbic acid, dopamine and uric acid based on tryptophan functionalized graphene. Analytica Chimica Acta, 2014;823():32-39. Analytica Chimica Acta can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Analytica Chimica Acta -

Our news correspondents report that additional information may be obtained by contacting Q.W. Lian, Northwest Normal Univ, Coll Chem & Chem Engn, Key Lab Bioelectrochem & Environm Anal Gansu Prov, Lanzhou 730070, People's Republic of China. Additional authors for this research include Z.F. He, Q. He, A. Luo, K.W. Yan, D.X. Zhang, X.Q. Lu and X.B. Zhou (see also Essential Amino Acids).

Keywords for this news article include: Asia, Lanzhou, Dopamine, Tryptophan, Sugar Acids, Ascorbic Acid, Catecholamines, Biogenic Amines, Organic Chemicals, Aromatic Amino Acids, Essential Amino Acids, People's Republic of China

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Source: Science Letter

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