Study of the interaction of oxovanadium(IV) with a plant component (caffeic acid). Synthesis and characterization of a solid compound

Williams, Patricia Ana María; Baró, Ana Cecilia González; Ferrer, Evelina G.

doi:10.1016/s0277-5387(02)01097-5

Cited by 17 publications

(14 citation statements)

References 14 publications

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“…In this case, and also at pH 12, a complex of composition Na 3 [VO(caf)(OH) 2 ]Á3H 2 O can be isolated in which the acid interacts with the oxocation through the two deprotonated OHgroups of the cetecholate-like part of the ligand [46]. On the other hand, potentiometric titrations complemented with the measurement of electronic spectra suggested the presence of some other species in solution, at different pH-values [46].…”

Section: Vo 2+ Complexes Of Quinic Acidmentioning

confidence: 82%

Oxovanadium(IV) complexes of carbohydrates: A brief overview

Baran¹

2009

Journal of Inorganic Biochemistry

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Section: Vo 2+ Complexes Of Quinic Acidmentioning

confidence: 82%

Oxovanadium(IV) complexes of carbohydrates: A brief overview

Baran¹

2009

Journal of Inorganic Biochemistry

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“…It is evident ( Figure 1, Table 1), that the absorption at 1645 cm −1 disappears for samples of CA/CeO2 with a lower concentration of CA, while this band appears at lower frequencies (1645-1632 cm −1 ). Literature data on the assignment of the absorption at 1645 cm −1 for СА [39,[41][42][43][44] differ. It was attributed [43] to the stretching vibrations of the double bonds C=C.…”

Section: Fourier Transform-infrared (Ft-ir) Spectroscopy Of Caffeic Amentioning

confidence: 93%

“…Literature data on the assignment of the absorption at 1645 cm −1 for СА [39,[41][42][43][44] differ. It was attributed [43] to the stretching vibrations of the double bonds C=C. However, most researchers attribute this band to νС=O [39,41,42,44].…”

Section: Fourier Transform-infrared (Ft-ir) Spectroscopy Of Caffeic Amentioning

confidence: 93%

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Nastasiienko

Palianytsia

Кartel

et al. 2019

Colloids and Interfaces

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The studies of pyrolysis of caffeic acid (CA) and its surface complexes is important for the development of technologies of heterogeneous catalytic pyrolysis of plant- and wood- based renewable biomass components. In this work, the structure and thermal transformations of the surface complexes of CA on the surface of nanoceria were investigated using Fourier transform–infrared (FT–IR) spectroscopy, thermogravimetric analysis (TGA) and temperature-programmed desorption mass spectrometry (TPD MS). It was found that CA on the surface of cerium dioxide forms several types of complexes: bidentate carboxylates, monodentate carboxylates and complexes formed as a result of interaction with phenolic hydroxyl groups. This is due to the ability of nanosized cerium dioxide to generate basic hydroxyl groups that can deprotonate phenolic groups to form phenolates on the surface. The main pyrolysis products were identified. The possible ways of forming 3,4-dihydroxyphenylethylene, acetylene carboxylic acid, pyrocatechol and phenol from surface complexes of CA were suggested. It was established that on the nanoceria surface effectively occur the decarboxylation, decarbonylation, and dehydration reactions of the CA, which are the desirable processes in biomass conversion technologies.

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“…The obtained values of pK a1 and pK a2 are in good agree- ment with those reported in literatures. [26][27][28][29][34][35][36][37] As shown in Fig. 1, the pK a1 of ligands C and D occurs in the carboxylic group, followed by the dissociation of hydroxyl group at the para-position (pK a2 ).…”

Section: Resultsmentioning

confidence: 96%

Solution Equilibrium Study of Divalent Metal Ions with Phenylpropanoid Derivatives and Acetylcysteine Ligands

Nguyen

Santoso

Nguyen

et al. 2016

CHEMICAL & PHARMACEUTICAL BULLETIN

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Solution equilibrium of divalent metal ions (M Mn21) Redox-inert metals such as mercury (Hg), lead (Pb) and cadmium (Cd) are toxic agents, exposure to these and other essential metals may cause negative effects on health.2) Metals are known to be able to bind with proteins in human body which may lead to various detrimental effects on human health. For instance, high exposure of zinc results in respiratory and gastrointestinal toxicity, clinical changes and copper deficiency.3) Excess amount of copper can cause serious diseases including cancers, liver and kidney damage.4) Cobalt exposure leads to ailment such as vision problem, lung problem, heart problem and thyroid damage. Exposure to manganese can cause disorders such as Parkinson, schizophrenia and dullness. Although nickel appears to be essential for plants and bacteria, however for human this metal was found to be difficult to elucidate and may cause severe health problems such as cancer. 5)Chelation therapy is known as an effective treatment to reduce the harmful effects of metal ions by utilizing the metal binding ability of organic ligand.6-10) Therefore to prevent metal intoxication, the ligand used should have stronger binding ability than the proteins. Phenylpropanoid derivatives, currently considered as promising chelating agents, are classified as phenolic acids that are known to function as natural antioxidant, free radical scavenger, anti-carcinogenic, and chemoprevention agent. [11][12][13][14] In this work, caffeic acid and dihydrocaffeic acid were chosen as the phenylpropanoid derivatives. Caffeic acid (denoted as ligand C) is an important anti-oxidative compound which can be extracted from natural sources such as coffee bean, potatoes, grains and vegetables. 15)This compound has beneficial pharmacological effects such as inhibit cancer cell in human HT-1080 fibro sarcoma cell line. 16,17) Dihydrocaffeic acid (denoted as ligand D) is a degradation product of caffeic acid, this compound is one of the critical phenolic antioxidants commonly present in olives, 18) and in blood or urine as the result of secondary metabolism of various polyphenols.19) The ortho-dihydroxyl structure of ligand D is also known to act as an active radical-scavenger. 15)On the other hand, acetylcysteine is an organic compound which has been approved as one of the essential medicines for basic health system by World Health Organization (WHO). 20)Acetylcysteine is known as a precursor for glutathione, the antioxidant which prevents formation of oxidative species in tissue. 21,22) . 22,24,25) The mixed ligand combination of acetylcysteine and ligands C or D is expected to improve the stability of the chelate complex.Recently, the complexation of ligands C and D with metal ion has gained attention of some researchers. [26][27][28][29][30] To the best of our knowledge, very few literatures are available for the complexation study of ligand D with essential divalent metal ions. Therefore, in order to gain primary understanding on the complexation of ligands C and D, potenti...

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Study of the interaction of oxovanadium(IV) with a plant component (caffeic acid). Synthesis and characterization of a solid compound

Cited by 17 publications

References 14 publications

Oxovanadium(IV) complexes of carbohydrates: A brief overview

Oxovanadium(IV) complexes of carbohydrates: A brief overview

Thermal Transformation of Caffeic Acid on the Nanoceria Surface Studied by Temperature Programmed Desorption Mass-Spectrometry, Thermogravimetric Analysis and FT–IR Spectroscopy

Solution Equilibrium Study of Divalent Metal Ions with Phenylpropanoid Derivatives and Acetylcysteine Ligands

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