The electrochemical reaction mechanism of selenocystine on selenium-gold film modified glassy carbon electrode

Bai, Yan; Yan, Xiaoli; Zheng, Wenjie; Rui, Li; Cheng, Tao; Ruan, Xiangyuan

doi:10.1016/j.colsurfb.2006.03.004

Cited by 8 publications

(26 citation statements)

References 12 publications

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“…(a novel Se-hyperaccumulator) grown in a Se mining area, which contradicts the current conception of plant Se metabolism along with the defense mechanism against substantial SeCys build-up in a cell. Although the coupling between SeCys and SeCys2 via redox reaction is known (Bai et al 2006), the physiological relevance of creating SeCys2 is not yet understood. In our case, we did not observe an increase in percentage of SeCys2 compared to untreated variants.…”

Section: Uptake Of Selenium and Other Macro-and Microelements By Plantsmentioning

confidence: 99%

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Šindelářová

Száková

Tremlová

et al. 2015

Food Additives & Contaminants: Part A

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A model small-scale field experiment was set up to investigate selenium (Se) uptake by four different varieties of broccoli plants, as well as the effect of Se foliar application on the uptake of essential elements for plants calcium (Ca), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), phosphorus (P), sulfur (S), and zinc (Zn). Foliar application of sodium selenate (Na2SeO4) was carried out at two rates (25 and 50 g Se/ha), and an untreated control variant was included. Analyses of individual parts of broccoli were performed, whereby it was found that Se in the plant accumulates mainly in the flower heads and slightly less in the leaves, stems, and roots, regardless of the Se rate and broccoli variety. In most cases, there was a statistically significant increase of Se content in all parts of the plant, while there was no confirmed systematic influence of the addition of Se on the changing intake of other monitored elements. Selenization of broccoli leads to an effective increase in the Se content at a rate of 25 g/ha, whereas the higher rate did not result in a substantial increase of Se content compared to the lower rate in all varieties. Therefore, the rate of 25 g/ha can be recommended as effective to produce broccoli with an increased Se content suitable for consumption. Moreover, Se application resulted in an adequate increase of the main organic compounds of Se, such as selenocystine (SeCys2), selenomethionine (SeMet), and Se-methylselenocysteine (Se-MeSeCys).

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Section: Uptake Of Selenium and Other Macro-and Microelements By Plantsmentioning

confidence: 99%

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Šindelářová

Száková

Tremlová

et al. 2015

Food Additives & Contaminants: Part A

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“…The 21st amino acid selenocysteine that is easily oxidized to selenocystine may endow proteins with a powerful redox chemistry [17]. In comparison with cystine, however, few studies have investigated the redox chemistry of selenocystine [18][19][20]. The Se-Se bonds of aromatic diselenides are known to cleave, thus forming selenolates that are analogous to the disulfides from several spectroscopic studies [21][22][23].…”

Section: Introductionmentioning

confidence: 98%

Adsorption of seleno-l-cystine on silver electrode surfaces investigated by surface-enhanced Raman scattering

Lim

Joo

2007

Journal of Electroanalytical Chemistry

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“…The peak currents increased with increasing concentration of SeCys and SeMet. The redox peaks of selenoamino acid are attributed to the catalysis of nanoSe 0 on the SAM nanoSe 0 /Vc/SeCys films [18]. In contrast with SeCys and SeMet, as a potential scan from À 500 to 500 mV, no voltammetric signals of sulfur amino acids such as cystine, cystine, methionine were observed at SAM nanoSe 0 /Vc/SeCys-film modified Au electrode.…”

Section: Electrochemical Behavior Of Selenoamino Acids On Sam Nanose mentioning

confidence: 98%

“…Compared with the above-mentioned techniques, voltammetric techniques are inexpensive, sensitive and selective. Our previous studies [17,18] showed that on selenium-gold film modified glassy carbon ((Se-Au)/ GC) electrode, SeCys has electrochemical signals, but SeMet has no signals, and the determination of SeCys by differential pulse voltammetry (DPV) using (Se-Au)/GC electrode is presented. In this work, the sol-gel films were prepared by self assembling selenium nanoparticles (nanoSe 0 ) combined with ascorbate acid (Vc) and selenocystine (SeCys) (SAM nanoSe 0 /Vc/SeCys films show in Fig.…”

Section: Introductionmentioning

confidence: 99%

Differential Pulse Voltammetric Determination of Selenocystine and Selenomethionine Using SAM nanoSe⁰/Vc/SeCys‐Film Modified Au Electrode

et al. 2009

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The SAM nanoSe 0 /Vc/SeCys-film modified Au electrode has been prepared to determine selenocystine and selenomethionine. The AFM and SEM showed the special three-dimensional (3D) network structure of the sol-gel films. The affinity between nanoparticles and biomolecules created special chemical characters analyzed by the XRD and fluorescence. The modified electrode was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The modified films partly had resistance in the charge transduction of Fe(CN) 4À=3À 6 , but the less electron-transfer resistance. Differential pulse voltammetric (DPV) determination of selenoamino acids using SAM nanoSe 0 /Vc/SeCys-film modified Au electrode was presented. In PBS (pH 7.0) þ 0.1 mol L À1 NaClO 4 solution, selenoamino acids yielded a sensitive reduction peak at about þ 400 AE 50 mV. The peak current had a linear relationship with the concentration of selenoamino acids in the range of 5.0 Â 10, and a 3s detection limit of selenoamino acids was 1.2 Â 10 À8 mol L À1. The relative standard deviation of DPV signals of 0.50 Â 10 À6 mol L À1 selenoamino acids was 3.8% (n ¼ 8) using the same electrode and was 4.4% (n ¼ 5) when using three modified electrodes prepared at different times. The content of selenoamino acids in the organo-selenium powder were determined by DPV. The results showed 71.5 mg g À1 of SeCys and 65.1 mg g À1 of SeMet in the organo-selenium powder.

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The electrochemical reaction mechanism of selenocystine on selenium-gold film modified glassy carbon electrode

Cited by 8 publications

References 12 publications

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Adsorption of seleno-l-cystine on silver electrode surfaces investigated by surface-enhanced Raman scattering

Differential Pulse Voltammetric Determination of Selenocystine and Selenomethionine Using SAM nanoSe⁰/Vc/SeCys‐Film Modified Au Electrode

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The electrochemical reaction mechanism of selenocystine on selenium-gold film modified glassy carbon electrode

Cited by 8 publications

References 12 publications

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

The response of broccoli (Brassica oleraceaconvar.italica) varieties on foliar application of selenium: uptake, translocation, and speciation

Adsorption of seleno-l-cystine on silver electrode surfaces investigated by surface-enhanced Raman scattering

Differential Pulse Voltammetric Determination of Selenocystine and Selenomethionine Using SAM nanoSe0/Vc/SeCys‐Film Modified Au Electrode

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Differential Pulse Voltammetric Determination of Selenocystine and Selenomethionine Using SAM nanoSe⁰/Vc/SeCys‐Film Modified Au Electrode