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Fangyuan?Tian Hongji?LiEmail author Mingji?LiEmail author Cuiping?Li Yingjie?Lei Baohe?Yang 《Mikrochimica acta》2017,184(6):1611-1619
The authors describe a voltammetric sensor for simultaneous determination of dopamine (DA), uric acid (UA), L-tyrosine (Tyr), and the diuretic drug hydrochlorothiazide (HCTZ). The assay is based on the use of graphene nanowalls deposited on a tantalum substrate. The nanowalls are characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry. The nanowalls are vertically grown on the substrate by direct-current arc plasma jet chemical vapor deposition. The modified electrode is shown to enable simultaneous differential pulse voltammetric determination of DA, UA, Tyr, and HCTZ. The graphene nanowalls display a large specific surface, high conductivity, and a large number of catalytically active sites for oxidation of analytes. Simultaneous detection is performed best at a pH value of 7.0 and at peak potentials of 0.124 V (vs. SCE) for DA, 0.256 V for UA, 0.536 V for Tyr and 0.708 V for HCTZ. The respective detection limits are 0.04 μM, 0.1 μM, 0.6 μM and 0.4 μM. The results show that this graphene wall modified electrode is a promising tool for the design of sensitive, selective, and stable sensors. 相似文献
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" href="/content/?Author=F.+Dubourg%cORF+RID%d%A%%e">F. Dubourg " href="/content/?Author=S.+Kopp-Marsaudon%cORF+RID%d%A%%e">S. Kopp-Marsaudon " href="/content/?Author=Ph.+Lecl%c%are%cORF+RID%d%A%%e">Ph. Leclère " href="/content/?Author=R.+Lazzaroni%cORF+RID%d%A%%e">R. Lazzaroni " href="/content/?Author=J.P.+Aim%c%a%cORF+RID%d%A%%e">J.P. Aimé 《The European physical journal. E, Soft matter》2001,6(5):387-397
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Aromatization of the title compound with selected acidic catalysts has been investigated. It has been established that depending upon the reaction conditions trienone 2,1 -methyltrienone3, dienone 4, diacetoxyketone5 or dione 6 are formed as the major products. Dienone 4 and dione 6 are the main compounds of the reactions of tosyloxyketone 10 with KHSO4 and HBraq, respectively. The reaction of acetoxyketone 8 with HBraq furnishes epimeric 3-bromoketones 12 and 13 in the ratio about 1:1. 相似文献