Kinetics of the reaction between 2,2?-azinobis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) derived radical cations and phenols

Campos, Ana M. F. Oliveira; Lissi, E. A.

doi:10.1002/(sici)1097-4601(1997)29:3<219::aid-kin9>3.0.co;2-x

Cited by 107 publications

(58 citation statements)

References 22 publications

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“…Given these considerations, using ORAC values to make dietary decisions is unwarranted and perhaps even unwise. [69,70], and peroxyl radicals [71] have also been used as oxidants. Of all these, persulfate oxidation is preferred for its high ABTS •+ yields and radical/antioxidant inertness.…”

Section: Basis For Calculating and Expressing Resultsmentioning

confidence: 99%

Methods of measurement and evaluation of natural antioxidant capacity/activity (IUPAC Technical Report)

Apak

Gorinstein

Böhm

et al. 2013

Pure and Applied Chemistry

487

374

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Abstract:The chemical diversity of natural antioxidants (AOXs) makes it difficult to separate, detect, and quantify individual antioxidants from a complex food/biological matrix. Moreover, the total antioxidant power is often more meaningful to evaluate health beneficial effects because of the cooperative action of individual antioxidant species. Currently, there is no single antioxidant assay for food labeling because of the lack of standard quantification methods. Antioxidant assays may be broadly classified as the electron transfer (ET)-and hydrogen atom transfer (HAT)-based assays. The results obtained are hardly comparable because of the different mechanisms, redox potentials, pH and solvent dependencies, etc. of various assays. This project will aid the identification and quantification of properties and mutual effects of antioxidants, bring a more rational basis to the classification of antioxidant assays with their constraints and challenges, and make the results more comparable and understandable. In this regard, the task group members convey their own experiences in various methods of antioxidants measurement.

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Section: Basis For Calculating and Expressing Resultsmentioning

confidence: 99%

Methods of measurement and evaluation of natural antioxidant capacity/activity (IUPAC Technical Report)

Apak

Gorinstein

Böhm

et al. 2013

Pure and Applied Chemistry

487

374

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“…Different free radicals were used for the determination of the antioxidant activity causing different reactivity with the phenolic compounds depending on their structure [21]. The ABTS˙+ has low selectivity in reactions with H-atom donors since it is reacting with any hydroxylated aromatics independently on their real antioxidant potential [22][23][24]. In contrast to ABTS˙+, the DPPH does not react with flavonoids, which contain no OH-groups in B-ring as well as with aromatic acids containing only one OH-group [24,25].…”

Section: Resultsmentioning

confidence: 99%

Phenol content and antioxidant activity of green, yellow and black tea leaves

Kopjar

Tadic

Piližota

2015

Chem Biol Techn Agric

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Background: Green, black and yellow tea leaves are rich in phenolic compounds that are known for their antioxidant activity thus beneficial effect on human health. In practice, different methods are used to determine antioxidant activity. The objective of this study was to determine content of phenols, flavonoids and tannins, as well as antioxidant activity of tea leaves. Results: Green, yellow and black tea leaves (intact and pulverised leaves) were used for extraction by methanol or acidified methanol. Spectrophotometric methods were used for determination of selected parameters. Antioxidant activity was determined in extracts and pulverised tea leaves by application of 2,2-diphenyl-1-picrilhydrazyl (DPPH) and 2,2′azinobis-(3-ethylbenzthiazoline-6-sulphonic acid (ABTS) free radicals. For determination of antioxidant activity of the pulverised leaves, 'QUENCHER' method was used. The method is based on the direct treatment of dry sample with free radicals. Extracts obtained by extraction of pulverised tea leaves with acidified methanol had the highest phenolic content (3.823, 4.226 and 6.829 g/kg for green, black and yellow tea, respectively). In methanol extracts, phenol content decreased in order yellow > green > black tea and, in acidified methanol extracts, yellow > black > green tea, regardless of particle size of tea leaves for extraction. Flavonoid and tannin contents followed the same tendency as phenol content. The highest antioxidant activity had acidified methanol extracts of pulverised tea leaves, regardless of used method (DPPH and ABTS). Results of antioxidant activity obtained with 'QUENCHER' method were compared with results of acidified methanol extracts. Green and yellow tea had higher antioxidant activity when 'QUENCHER' method was used in contrast to the black tea where higher antioxidant activity was determined in extract. Conclusions: Particle size and extraction solvent had high influence on total phenolic compounds, total flavonoid and tannin content as well as on antioxidant activity. Also, antioxidant activity of samples highly depended on used free radicals and sample preparation prior their application.

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“…In the assay, the potassium persulfate reagent has shown the ability to oxidize ABTS to the radical cation ABTS •+ , a long-living species with high extinction coefficients at 416, 650, and 734nm (Campos and Lissi, 1997).…”

Section: Methodsmentioning

confidence: 84%

The in Vitro Antioxidant Properties of 2-Alkoxyphenylcarbamic Acid Derivatives Containing a 4´-(Substituted Phenyl)piperazin-1´-Yl Moiety Determined by the 2,2´-Azinobis(3-Ethylbenzothiazoline-6-Sulfonic Acid) Derived Radical Cation (Abts•+) and Ferric Re

Malík

Stanzel

Csöllei

et al. 2017

Indonesian J. Pharm.

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In an effort to comprehensively characterize an antioxidant profile of 2-alkoxyphenylcarbamic acid-based compounds containing a 4´-(substituted phenyl)piperazin-1´-yl fragment, they were in vitro screened in the 2,2´-azino-bis(3-ethylbenzothiazoline-6--sulfonic acid) derived radical cation (ABTS •+ ) and ferric reducing antioxidant power (FRAP) assay using the UV/VIS spectrophotometry. The ABTS•+ scavenging (reducing) potential of 1-[3-(2-methoxyphenylcarbamoyl)oxy-2-hydroxypropyl]-4-(4--fluorophenyl)piperazin-1-ium chloride was found to be the most promising and it was comparable to the efficiency of the carvedilol reference drug. Moreover, that 4´-fluoro group-containing compound was regarded as more active than the atenolol standard. When testing the molecules´ power to reduce the ferric 2,4,6-tris (2-pyridyl)-s-triazine complex [Fe(III)(TPTZ) 2 ] 3+ , the most prospective was 1-[3-(2-ethoxyphenylcarbamoyl)oxy-2--hydroxypropyl]-4-(4-fluorophenyl)piperazin-1-ium chloride. On the other hand, its Fe 3+ reducing power was lower compared to both standards carvedilol and atenolol. The study discussed structure-antioxidant properties relationships considering electronic, steric and lipophilic features.

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Kinetics of the reaction between 2,2?-azinobis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) derived radical cations and phenols

Cited by 107 publications

References 22 publications

Methods of measurement and evaluation of natural antioxidant capacity/activity (IUPAC Technical Report)

Methods of measurement and evaluation of natural antioxidant capacity/activity (IUPAC Technical Report)

Phenol content and antioxidant activity of green, yellow and black tea leaves

The in Vitro Antioxidant Properties of 2-Alkoxyphenylcarbamic Acid Derivatives Containing a 4´-(Substituted Phenyl)piperazin-1´-Yl Moiety Determined by the 2,2´-Azinobis(3-Ethylbenzothiazoline-6-Sulfonic Acid) Derived Radical Cation (Abts•+) and Ferric Re

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