Flavonoid electrochemistry: a review on the electroanalytical applications

Gil, Éric S.; Couto, Renê Oliveira do

doi:10.1590/s0102-695x2013005000031

Cited by 146 publications

(88 citation statements)

References 90 publications

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“…78 Flavonoids can be classified into several groups based on the presence/absence of the carbon-carbon double bond between C 2 and C 3 positions, a hydroxy group on C 3 position, and a carbonyl carbon at the C 4 position. 79 These compounds represent a remarkably diverse group of secondary metabolites with a diverse array of biological activities mainly related to their antioxidant activity. 80 Flavonoids are found to be present mainly in land plants, but recent investigations indicate the presence of flavonoids in marine flora.…”

Section: Phenolic Acidsmentioning

confidence: 99%

“…90 In general, the radical scavenging activities are mainly governed by their molecular structure and the substitution pattern of hydroxy moieties. 79 Attachment of hydroxy substituents to the phenyl rings mainly at the C 3 position and unsaturation of the C 2 -C 3 position conjugated with the C 4 keto group extend the electron delocalization and increase the antiperoxidative properties. 88,91 In addition, the FIG.…”

Section: Phenolic Acidsmentioning

confidence: 99%

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Antioxidant Activity of Marine Algal Polyphenolic Compounds: A Mechanistic Approach

Fernando

KimMisook

SonKwang-Tae

et al. 2016

Journal of Medicinal Food

157

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Polyphenolic compounds isolated from marine algae exhibit a broad spectrum of beneficial biological properties, including antioxidant, anticancer, antimicrobial, anti-inflammatory, and antidiabetic activities, along with several other bioactivities centered on their antioxidant properties. Consequently, polyphenolic compounds are increasingly being investigated for their potential use in food, cosmetic, and pharmaceutical applications. The antioxidant activities of these compounds have been explored widely through experimental studies. Nonetheless, a theoretical understanding of the structural and electronic properties could broaden research perspectives, leading to the identification and synthesis of efficient structural analogs with prophylactic uses. This review briefly summarizes the current state of knowledge regarding antioxidant polyphenolic compounds in marine algae with an attempt to describe the structure-activity relationship.

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Section: Phenolic Acidsmentioning

confidence: 99%

Section: Phenolic Acidsmentioning

confidence: 99%

Antioxidant Activity of Marine Algal Polyphenolic Compounds: A Mechanistic Approach

Fernando

KimMisook

SonKwang-Tae

et al. 2016

Journal of Medicinal Food

157

View full text Add to dashboard Cite

show abstract

“…They are usually found with various degrees of hydroxylation, methoxylation, glycosylation or glucuronidation [13, 14], which contributes to the great variety in biological properties and form the largest group in the polyphenol family with over 6,000 compounds identified so far [13]. …”

Section: Introductionmentioning

confidence: 99%

In Vitro Antioxidant versus Metal Ion Chelating Properties of Flavonoids: A Structure-Activity Investigation

et al. 2016

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Natural flavonoids such as quercetin, (+)catechin and rutin as well as four methoxylated derivatives of quercetin used as models were investigated to elucidate their impact on the oxidant and antioxidant status of human red blood cells (RBCs). The impact of these compounds against metal toxicity was studied as well as their antiradical activities with DPPH assay. Antihemolytic experiments were conducted on quercetin, (+)catechin and rutin with excess of Fe, Cu and Zn (400 μM), and the oxidant (malondialdehyde, carbonyl proteins) and antioxidant (reduced glutathione, catalase activity) markers were evaluated. The results showed that Fe and Zn have the highest prooxidant effect (37 and 33% of hemolysis, respectively). Quercetin, rutin and (+)catechin exhibited strong antioxidant properties toward Fe, but this effect was decreased with respect to Zn ions. However, the Cu showed a weak antioxidant effect at the highest flavonoid concentration (200 μM), while a prooxidant effect was observed at the lowest flavonoid concentration (100 μM). These results are in agreement with the physico-chemical and antiradical data which demonstrated that binding of the metal ions (for FeNTA: (+)Catechin, KLFeNTA = 1.6(1) × 106 M-1 > Rutin, KLFeNTA = 2.0(9) × 105 M-1 > Quercetin, KLFeNTA = 1.0(7) × 105 M-1 > Q35OH, KLFeNTA = 6.3(8.7) × 104 M-1 > Quercetin3’4’OH and Quercetin 3OH, KLFeNTA ~ 2 × 104 M-1) reflects the (anti)oxidant status of the RBCs. This study reveals that flavonoids have both prooxidant and antioxidant activity depending on the nature and concentration of the flavonoids and metal ions.

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“…The V oc value is associated with conduction band of ZnO photoanode and enhancement of charge recombination at the ZnO/dye/electrolyte interface [48,49]. The higher V oc values of Fe-valonea and Fe-chestnut can be explained by charge recombination rate and relative positions of conduction band of ZnO [49,50]. The Fe-complex sensitizers lead to enhanced electron transfer to the ZnO surface upon adsorption.…”

Section: Photoelectrochemical Propertiesmentioning

confidence: 99%

Investigation of Vegetable Tannins and Their Iron Complex Dyes for Dye Sensitized Solar Cell Applications

Çakar

Güy

Özacar

et al. 2016

Electrochimica Acta

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Flavonoid electrochemistry: a review on the electroanalytical applications

Cited by 146 publications

References 90 publications

Antioxidant Activity of Marine Algal Polyphenolic Compounds: A Mechanistic Approach

Antioxidant Activity of Marine Algal Polyphenolic Compounds: A Mechanistic Approach

In Vitro Antioxidant versus Metal Ion Chelating Properties of Flavonoids: A Structure-Activity Investigation

Investigation of Vegetable Tannins and Their Iron Complex Dyes for Dye Sensitized Solar Cell Applications

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