Electrocatalytic oxidation of tyrosine at poly(threonine)-film modified carbon paste electrode and its voltammetric determination in real samples

Chitravathi, S.; Swamy, B.E. Kumara; Mamatha, G.; Chandrashekar, Bananakere Nanjegowda

doi:10.1016/j.molliq.2012.03.022

Cited by 41 publications

(12 citation statements)

References 27 publications

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“…The linear regression equation for E pa vs. pH was E pa (V) = − 62 pH + 1.10 (R 2 = 0.997). The slope of −62 mV/pH clearly indicates that the number of protons and electrons involved in the electrochemical oxidation of Tyr was the same and it is one [35]. Fig.…”

Section: Effects Of Number Of Cycles Of Pth Formation and Ph For Tyr mentioning

confidence: 79%

Selective detection of l-tyrosine in the presence of ascorbic acid, dopamine, and uric acid at poly(thionine)-modified glassy carbon electrode

Rahman

Lopa

Kim

et al. 2015

Journal of Electroanalytical Chemistry

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Section: Effects Of Number Of Cycles Of Pth Formation and Ph For Tyr mentioning

confidence: 79%

Selective detection of l-tyrosine in the presence of ascorbic acid, dopamine, and uric acid at poly(thionine)-modified glassy carbon electrode

Rahman

Lopa

Kim

et al. 2015

Journal of Electroanalytical Chemistry

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“…Chitravathi et al. reported a negative shift in the peak potential when the measurement of tyrosine alone was performed using a carbon paste electrode modified with poly(threonine) . We constructed a tyrosine‐rich peptide with a cysteine residue, which would have influenced an opposite shift.…”

Section: Resultsmentioning

confidence: 99%

“…In the presence of peptide-2-8 probe, the peak potential of 0.68 V (scan rate, 50 mVs À 1 ) for a tyrosine-rich peptide was shifted in a positive direction due to the interaction between the peptide-2-8 probe and the tyrosine-rich peptide. Chitravathi et al reported a negative shift in the peak potential when the measurement of tyrosine alone was performed using a carbon paste electrode modified with poly(threonine) [30]. We constructed a tyrosine-rich peptide with a cysteine residue, which would have influenced an opposite shift.…”

Section: Effect Of the Peak Current Of Tyrosine-rich Peptide-1 Causedmentioning

confidence: 99%

Electrochemical Sensing of Ovalbumin Based on the Interaction between Lysozyme Origin/Tyrosine‐rich Peptides Modified on Magnetic Beads and Oligothreonine/Ovalbumin‐origin Peptide

et al. 2019

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We developed a highly sensitive electrochemical system for the sensing of ovalbumin (OVA). Lysozyme origin/tyrosine‐rich peptides (RNRCKGTDVQAWY4C) were immobilized on magnetic beads, and the competitive reaction between OVA and oligothreonine/OVA origin peptide probe (T8VLLPDEVSG) could then be measured. In a previous study, the detection of OVA at the 10−13 M level was achieved using RNRCKGTDVQAWY4C‐modified beads via a cross‐linker. To improve the sensitivity to OVA, this system uses T8VLLPDEVSG peptide probe to measure the interaction to RNRCKGTDVQAWY4C immobilized on magnetic beads. The peak of Y4C actually was an electron‐transfer peptide, which represented the oxidation of a phenolic hydroxyl group. First, we confirmed that the oxidation response of Y4C was increased based on an improvement in the electron transfer accessibility by oligothreonine. Next, T8VLLPDEVSG peptide probe was used for the electrochemical sensing of OVA in solutions that contained consistent amounts of RNRCKGTDVQAWY4C on magnetic beads. As a result, the peak current decreased as the concentration of OVA increased. The sensitivity to OVA was improved compared with the use of only RNRCKGTDVQAWY4C on magnetic beads. The OVA detection level was 10−14 M, which approximates the results from antibody‐antigen reactions. Consequently, the proposed system is a powerful new concept in protein sensing.

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“…Several research groups have previously fabricated electrodes modified with a carbon coating and with essential amino acids for sensing applications. The essential amino acids that have been explored include phenylalanine [15], glycine [16], threonine [17], tryptophan [18], methionine [19], leucine [20], isoleucine [21], lysine [22], and histidine [23]. Interestingly, essential amino-acid-modified electrodes have reportedly displayed above-average sensing capabilities.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

Chandrashekar

Jayaprakash

et al. 2019

Chemosensors

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Fabrication of biocompatible electrodes for the investigation of catecholamines is a known challenge. In this work, methionine was chosen as a modifier for fabrication of a biocompatible carbon paste electrode by electropolymerization, through cyclic voltammetry. The electrochemical behavior of the poly(methionine) modified carbon paste electrode was characterized by cyclic voltammetry for simultaneous determination of dopamine (DA) and uric acid (UA) in a phosphate-buffered solution at pH 7.0. In the absence of an amino acid methionine layer, the bare carbon paste electrode exhibits rather poor voltammetric signals in DA and UA in the binary mixture, with oxidation potentials of DA and UA overlapping with each other. The poly(methionine) modified carbon paste electrode exhibits good catalytic activity with noticeably different oxidation potentials of DA and UA. The experimental results closely agree with the theoretical prediction based on a Fukui function complementary to the simulated electrostatic potential maps.

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Electrocatalytic oxidation of tyrosine at poly(threonine)-film modified carbon paste electrode and its voltammetric determination in real samples

Cited by 41 publications

References 27 publications

Selective detection of l-tyrosine in the presence of ascorbic acid, dopamine, and uric acid at poly(thionine)-modified glassy carbon electrode

Selective detection of l-tyrosine in the presence of ascorbic acid, dopamine, and uric acid at poly(thionine)-modified glassy carbon electrode

Electrochemical Sensing of Ovalbumin Based on the Interaction between Lysozyme Origin/Tyrosine‐rich Peptides Modified on Magnetic Beads and Oligothreonine/Ovalbumin‐origin Peptide

Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

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