Tin(II)–quercetin complex: Synthesis, spectral characterisation and antioxidant activity

Dehghan, Gholamreza; Khoshkam, Zahra

doi:10.1016/j.foodchem.2011.08.074

Cited by 151 publications

(110 citation statements)

References 26 publications

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“…Another possibility is that the aluminium surface is characterized by non similar (heterogeneous) adsorption sites. In contrast, earlier adsorption studies by Langmuir [31] posited that surface adsorption sites are similar (homogeneous) for adsorbents from which plots of adsorption data gave values of unity and therefore favour chemisorption. For the fact that physisorption was proposed earlier (section "Gravimetric measurement"), consequently, these adsorbing CASTAN molecules (adsorbates) would interact with themselves, and multilayer coverage by adsorbing molecules is expected, otherwise, aluminium surface is characterized with/by heterogeneous (non similar) adsorption sites.…”

Section: Adsorption Considerationsmentioning

confidence: 73%

“…Therefore, the UV/visible spectrum of CASTAN in ethanol shows a 'sharp' peak at 315 nm and a broad (or shoulder) peak around 420-480 nm, hence, characteristic of condensed tannins [29,30]. Wavelength range of 300-400 nm is related to conjugated system between ring B and carbonyl of ring C for band I (cinnamoyl), and band II (benzoyl) located in the wavelength range of 240-300 nm is related to conjugated system between ring A and carbonyl of ring C, hence, quercetin implicated [31]. Fig.…”

Section: Results and Discussion Ftir And Uv/visible Spectrophotometrmentioning

confidence: 99%

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Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Nnaji

Obi-Egbedi

Okoye

2014

Port. Electrochim. Acta

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Cashew nut testa tannin [CASTAN] has been found to inhibit the corrosion of aluminium in hydrochloric acid solutions using gravimetric, thermometric and UV/visible spectrophotometric techniques. CASTAN inhibition was by adsorption on aluminium following Temkin isotherm in 0.1 M HCl and Langmuir isotherm in 0.5 M and 2.0 M HCl at 303 Kelvin. Physical adsorption on aluminium has been proposed in studied HCl solutions; therefore, CASTAN is a cathodic inhibitor. Earlier reports [1] showed CASTAN to contain quercetin, azaleatin, catechin, epicatechin, cyanidin and delphinidin. However, UV/visible spectrophotometric analysis of CASTAN in ethanol reveals quercetin as its major component. This work therefore investigated the correlation between computed molecular parameters and inhibitive properties of CASTAN and adsorption sites on its components. Calculated quantum chemical parameters namely: E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), energy gap (∆E) and dipole moment ( µ ) suggest that CASTAN is a soft inhibitor and it's components inhibited aluminium corrosion in protonated forms. Calculated Mulliken charges implicated some electron rich sites, namely: the aromatic and conjugated C=C, C=O and O-H as adsorption sites on the inhibitor molecules. Proposed kinetic model reveals complex reaction mechanism, parallel reactions, for aluminium corrosion inhibition by CASTAN.

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Section: Adsorption Considerationsmentioning

confidence: 73%

Section: Results and Discussion Ftir And Uv/visible Spectrophotometrmentioning

confidence: 99%

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Nnaji

Obi-Egbedi

Okoye

2014

Port. Electrochim. Acta

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“…Absorption curves had three absorption bands with different wavelength positions and intensities depending on the type of solvent [1]. The band I in the range 358-360 nm (methanolic solution) and 346-354 nm (aqueous solution) demonstrated the presence in the molecule the cynamoil radical and -OH phenolic groups (associated with the conjugated system between ring B and carbonyl of ring C); the band II at 258 nm (methanolic solution) and 256 nm (aqueous solution) were attributed to benzyl radical (associated with the conjugated system between ring A and carbonyl of ring C) [34]. The absorption bands present in the UV-VIS spectra of rutin and its salts derived from the following transitions: n ?…”

Section: Uv-vis Spectramentioning

confidence: 99%

Alkali metal salts of rutin – Synthesis, spectroscopic (FT-IR, FT-Raman, UV–VIS), antioxidant and antimicrobial studies

Samsonowicz

Kamińska

Kalinowska

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Analysis of DPPH radical scavenging activity. The DPPH radical scavenging activity was measured according to the method of Dehghan & Khoshkam (2012) with some modications.…”

Section: Elemental Analysismentioning

confidence: 99%

“…Fe(II), 20 Fe(III), 12 Sn(II) 14 and Cr(III) 21 has already been reported. In a previous report, copper-quercetin complex was synthesized and conrmed to be much more effective in free radical scavenging activity than the free quercetin.…”

mentioning

confidence: 91%

Enhanced antioxidant activity, antibacterial activity and hypoglycemic effect of luteolin by complexation with manganese(ii) and its inhibition kinetics on xanthine oxidase

Dong

Yang

et al. 2017

RSC Adv.

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The present study aims to improve the biological activities of luteolin by complexation with manganese(II).UV-visible spectroscopy, infrared spectroscopy, thermogravimetric analysis and elemental analysis were adopted to assess the relevant interaction of luteolin and manganese(II) ions and the chelation sites. The antioxidant activity, hypoglycemic effect and antimicrobial activity of luteolin-manganese(II) complex with respect to its parent luteolin and the inhibition effect of which on xanthine oxidase were investigated and compared. The spectroscopic data indicated that luteolin reacts with manganese(II) cations through the chelation sites of 5-hydroxy and 4-carbonyl in two luteolin molecules. Antioxidant and antibacterial activity were enhanced after the complexation of manganese(II) cations with luteolin. An inhibition effect assay found that luteolin and luteolin-manganese(II) complex reversibly inhibited xanthine oxidase in a competitive manner. Luteolin-manganese(II) complex had a more remarkable hypoglycemic effect than luteolin by increasing the glucose consumption in liver tissue.

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Tin(II)–quercetin complex: Synthesis, spectral characterisation and antioxidant activity

Cited by 151 publications

References 26 publications

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Alkali metal salts of rutin – Synthesis, spectroscopic (FT-IR, FT-Raman, UV–VIS), antioxidant and antimicrobial studies

Enhanced antioxidant activity, antibacterial activity and hypoglycemic effect of luteolin by complexation with manganese(ii) and its inhibition kinetics on xanthine oxidase

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