Solvent effect on the anodic oxidation of tannic acids: EPR/UV–Vis spectroelectrochemical and DFT theoretical study

Lukeš, Vladimı́r; Darvasiová, Denisa; Furdíková, Katarína; Hubertová, Ivana; Rapta, Peter

doi:10.1007/s10008-015-2921-9

Cited by 7 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure presents the UV–visible spectra of uTA and oTA aqueous solutions. The spectrum of uTA solution presented an absorption maximum at about 370 nm, while that of oTA solution exhibited a hyperchromic shift, indicating that the tannic acid in the oTA solution was indeed oxidized …”

Section: Resultssupporting

confidence: 86%

“…The spectrum of uTA solution presented an absorption maximum at about 370 nm, while that of oTA solution exhibited a hyperchromic shift, indicating that the tannic acid in the oTA solution was indeed oxidized. 21,22 Table 1 presents the experimental responses for the film properties. The models for films obtained from uTA and oTA are represented by regression equations and statistical parameters in Table 2 and Table 3, respectively, and by the contour plots in Fig.…”

Section: Film Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Zein films with unoxidized or oxidized tannic acid

et al. 2017

View full text Add to dashboard Cite

show abstract

Section: Resultssupporting

confidence: 86%

Section: Film Characterizationmentioning

confidence: 99%

Zein films with unoxidized or oxidized tannic acid

et al. 2017

View full text Add to dashboard Cite

show abstract

“…TA films with or without laccase displayed absorption spectra with a broad band spanning the visible region (Figure S2l), indicating laccase-independent/pH-induced oxidation of TA. A weak amber coloration in TA films indicated the formation of the oxidative products …”

Section: Results and Discussionmentioning

confidence: 99%

Multifunctional Polyphenols- and Catecholamines-Based Self-Defensive Films for Health Care Applications

Dhand

Harini

Mayandi

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In an era of relentless evolution of antimicrobial resistance, there is an increasing demand for the development of efficient antimicrobial coatings or surfaces for food, biomedical, and industrial applications. This study reports the laccase-catalyzed room-temperature synthesis of mechanically robust, thermally stable, broad spectrum antimicrobial films employing interfacial interactions between poly(vinyl alcohol), PVA, and 14 naturally occurring catecholamines and polyphenols. The oxidative products of catecholamines and polyphenols reinforce the PVA films and also alter their surface and bulk properties. Among the catecholamines-reinforced films, optimum surface and bulk properties can be achieved by the oxidative products of epinephrine. For polyphenols, structure-property correlation reveals an increase in surface roughness and elasticity of PVA films with increasing number of phenolic groups in the precursors. Interestingly, PVA films reinforced with oxidized/polymerized products of pyrogallol (PG) and epinephrine (EP) display potent antimicrobial activity against pathogenic Gram-positive and Gram-negative strains, whereas hydroquinone (HQ)-reinforced PVA films display excellent antimicrobial properties against Gram-positive bacteria only. We further demonstrate that HQ and PG films retain their antimicrobial efficacy after steam sterilization. With an increasing trend of giving value to natural and renewable resources, our results have the potential as durable self-defensive antimicrobial surfaces/films for advanced healthcare and industrial applications.

show abstract

“…Furthermore, they are amenable for miniaturisation and do not suffer from colour interference. Many different electrochemical methods have been developed in literature for the determination of polyphenols [15][16][17][18][19]. The most common electrochemical techniques for the determination of GA have been CV and differential pulse voltammetry (DPV), which were also used in this work.…”

Section: Introductionmentioning

confidence: 99%

The synergistic effect between graphene oxide nanocolloids and silicon dioxide nanoparticles for gallic acid sensing

Chikere

Faisal

Lin

et al. 2019

J Solid State Electrochem

View full text Add to dashboard Cite

For the first time, the synergistic effect of graphene oxide nanocolloids (nano-GO) and silicon dioxide (silica) nanoparticles (SiO 2-nanoparicles) has been used to modify a glassy carbon electrode (GCE) for the determination of gallic acid (GA). The modified electrode surface was characterised by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXA) and Fourier transform infrared spectroscopy (FTIR). The electrochemical behaviour of the modified electrode was then studied, using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), showing that the electrode was sensitive to GA in a concentration range of 6.25 × 10 −6 to 1.0 × 10 −3 mol L −1 , with a correlation coefficient R 2 of 0.9956 and a limit of detection of 2.09 × 10 −6 mol L −1 (S/N = 3). The proposed method was successfully used for the determination of GA in red wine, white wine and orange juice, with recoveries of 102.3, 95.4 and 97.6%, respectively.

show abstract

Solvent effect on the anodic oxidation of tannic acids: EPR/UV–Vis spectroelectrochemical and DFT theoretical study

Cited by 7 publications

References 30 publications

Zein films with unoxidized or oxidized tannic acid

Zein films with unoxidized or oxidized tannic acid

Multifunctional Polyphenols- and Catecholamines-Based Self-Defensive Films for Health Care Applications

The synergistic effect between graphene oxide nanocolloids and silicon dioxide nanoparticles for gallic acid sensing

Contact Info

Product

Resources

About