Antioxidant study of quercetin and their metal complex and determination of stability constant by spectrophotometry method

Ravichandran, R.; Rajendran, M.; Devapiriam, D.

doi:10.1016/j.foodchem.2013.09.080

Cited by 152 publications

(69 citation statements)

References 27 publications

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“…39 It can be also resulting from its pentahydroxyflavone structure allowing it to chelate metal ions via the orthodihydroxy phenolic structure and by scavenging lipid alkoxyl and peroxyl radicals. 40,41 The antioxidant properties of the extract, chlorogenic acid and quercetin in alloxan rat model (and also antidiabetic effect) were confirmed in our early study.…”

supporting

confidence: 61%

Hepatoprotective and antiproliferative activity of moringinine, chlorogenic acid and quercetin

2016

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supporting

confidence: 61%

Hepatoprotective and antiproliferative activity of moringinine, chlorogenic acid and quercetin

2016

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“…The complexes of Fe(II), Ni(II), Co(II) and Zn(II) with quercetin possessed metal/ligand stoichiometries 2:1, and the 5-hydroxychromone moieties were involved in metal coordination [22]. Moreover, the composition of Cd(II) [23], Ni(II), Co(II), Pd(II) [24], Cu(II) [25], Ca(II) and Mg(II) [26] complexes with quercetin was established as 1:1 in different pH from 5 to 11. In the case of Ca(II) and Mg(II) complexes, the metals were coordinated through a bidentate ligand (through the catechol moiety on the B ring) [26].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic, thermogravimetric and biological studies of Na(I), Ni(II) and Zn(II) complexes of quercetin

Kalinowska

Świderski

Matejczyk

et al. 2016

J Therm Anal Calorim

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The Na(I), Zn(II) and Ni(II) complexes with quercetin have been synthesized. The composition of these compounds was established by means of elemental and thermogravimetric analyses. To study the molecular structure of synthesized compounds, many miscellaneous analytical methods, which complement one another, were used: infrared (FT-IR), Raman (FT-Raman) and electronic absorption UV/VIS spectroscopy. For studying the cytotoxic and genotoxic activity of synthesized compounds, bioreporter strain of Escherichia coli K-12 recA::gfpmut2 has been used.

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“…Job's method was employed to study the stoichiometric ratio 37 , between Cu 2+ and neocuproine. The solutions were prepared with an equal molar concentration and the volumetric ratio from 1:9 to 9:1 (v/v) was varied.…”

Section: General Aspectsmentioning

confidence: 99%

Spectrophotometric Determination of Reducing Sugar in Wines Employing in-Line Dialysis and a Multicommuted Flow Analysis Approach

Silva

Souza

Paim

et al. 2018

J. Chil. Chem. Soc.

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A multicommuted flow procedure for the spectrophotometric determination of reducing sugars in wine has been developed. A dialysis unit was incorporated in the system to minimize matrix interferences and eliminate the colored compounds of the wine. The oxidation-reduction reaction in an alkaline medium between reducing sugars and the Cu 2+ -Neocuproine complex was employed. The compound formed was monitored at 460 nm. In the proposed procedure, there was a linear response between 0.25 and 4.0 g L -1 reducing sugars (y = (0.36 ± 0.02) + (0.31 ± 0.01) * x, R = 0.9975, n = 6), a coefficient of variance of 2.6% for a reducing sugar solution of 2.0 g L -1 (n = 7), a limit of detection estimated at 0.03 g L -1 , reagent consumption per determination of 0.330, 0.128 and 0.160 mg for neocuproine, CuSO 4 and NaOH, respectively. A sampling throughput of 45 determinations per hour was achieved. The proposed system was applied to wine samples and comparing the results with an AOAC official method no significant difference at a 95% confidence level.

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Antioxidant study of quercetin and their metal complex and determination of stability constant by spectrophotometry method

Cited by 152 publications

References 27 publications

Hepatoprotective and antiproliferative activity of moringinine, chlorogenic acid and quercetin

Hepatoprotective and antiproliferative activity of moringinine, chlorogenic acid and quercetin

Spectroscopic, thermogravimetric and biological studies of Na(I), Ni(II) and Zn(II) complexes of quercetin

Spectrophotometric Determination of Reducing Sugar in Wines Employing in-Line Dialysis and a Multicommuted Flow Analysis Approach

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