The Electrochemistry and Determination of Some Neurotransmitters at SrPdO₃Modified Graphite Electrode

Abstract

Graphite/SrPdO 3 was utilized for the sensitive determination of some neurotransmitters, namely dopamine (DA), epinephrine (EP), norepinephrine (NE), serotonin (ST), 3,4-dihydroxyphenylacetic acid (DOPAC) and L-dopa. Graphite/SrPdO 3 exhibited higher electrocatalytic activity toward the studied neurotransmitters compared to bare graphite. It was confirmed that graphite electrode was more suitable substrate for immobilization of SrPdO 3 perovskite compared to other surfaces. Moreover, simultaneous determinations of L-dopa, ascorbic acid (AA) and uric acid (UA) or ST were achieved with large peak potential separation. The linear response for L-dopa was obtained in the range of 0.6 μmol L −1 to 9 μmol L −1 with correlation coefficient 0.996 and detection limit 1.63 nmol L −1 . The proposed composite sensor exhibited high reproducibility, enhanced sensitivity, selectivity, anti-interference ability, unique long-term stability (over two months) and applicability in the human urine samples with satisfying results.

Influence of polyaniline on photoelectrochemical characterization of TiO2-PANI layers

“…The given data in figure 5 illustrates the main groups belonging to PANI structure like that reported in [6,10]. It explains that PANI existed in our composite material.…”

“…Conversely, Ti/ TiO 2 has shown to be an anodic stable electrode, but also an insulating material [4], however, its surface properties can be improved by doping PANI [5,6] so that Ti/TiO 2 -PANI composite can be used as anode material in power sources. A large number of studies on composite materials of TiO 2 -PANI have been reported; most researches on these polymers are still focusing on the preparation of materials and characterization [4,7], such as morphology and chemical structures as well as electrochemical properties [8,9], such as electrochemical impedance and cyclic polarization.…”

Sensitive determination of Amaranth in drinks by highly dispersed CNT in graphene oxide “water” with the aid of small amounts of ionic liquid

“…Owing to its unique structures (Fukushima et al, 2003), large surface to volume ratio and remarkable electrical properties (Atta, Ali, El-Ads, & Galal, 2013;Paul, Choi, Lee, Sudhagar, & Kang, 2012), CNTs have been used extensively in the http://dx.doi.org/10.1016/j.foodchem.2015.01.143 0308-8146/Ó 2015 Elsevier Ltd. All rights reserved. electro-detection (Wang et al, 2010;Zhao, Zhang, Wu, Chen, & Zhou, 2011).…”

Designing perovskite BFO (111) membrane as an electrochemical sensor for detection of amino acids: A simulation study

“…In such devices, the coupling of the sensitive recognition layer to hybridization indicators is still significant interest. Several studies [17] have been devoted to devising an efficient way to improve the electrochemical sensitivity of semiconductor sensor. For example, Wang et al [18,19] built a sensitive electrochemical sensor for amino acids based on perovskite LaNi 0.5 Ti 0.5 O 3 modified carbon paste electrode.…”