scholarly journals In vitro antioxidant activity of honeydew and multifloral types of honey from Serbia

2013 ◽  
pp. 269-277 ◽  
Author(s):  
Zoran Maksimovic ◽  
Nebojsa Nedic
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Geographic Origin ◽  
Radical Scavenging ◽  
Colour Intensity ◽  
Polyphenol Content ◽  
Total Polyphenol ◽  
Antioxidant Power ◽  
Total Polyphenol Content ◽  
Ferric Reducing Antioxidant Power

Antioxidant properties of fifteen multifloral and honeydew types of honey from Serbia were assessed by determination of ferric-reducing antioxidant power (FRAP assay) and 2,2- diphenyl-1-picrylhydrazyl free radical scavenging ability (DPPH assay), with respect to their total polyphenol content and colour intensity. The results of this study showed that total polyphenol content, antioxidant activity and colour intensity varied widely among different samples, even within the same type of honey. All investigated parameters were strongly dependent on geographic origin of samples, further emphasizing the importance of their detailed chemical characterisation. In general, polyphenolic content in investigated samples of honey, expressed as catechin equivalents, ranged from 480.2 to 1861.1 mg/kg. The ferric-reducing antioxidant power of honey tended to be lower in brighter and higher in darker samples, varying between 489.6 and 3089.8 ?mol Fe(II) per 100 g of honey. The correlation between the colour and antioxidant activity never reached statistical significance in the case of honeydew type of honey, which was opposed to a trend observed in the case of multifloral honey.

scholarly journals Influence of Packaging Material on Polyphenol Content and Antioxidant Activity in Some Commercial Beers

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 620
Author(s):  
Mihaela Mirela Bratu ◽  
Semaghiul Birghila ◽  
Antoanela Popescu ◽  
Bogdan-Stefan Negreanu-Pirjol ◽  
Marius Radu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Polyphenol Content ◽  
Total Polyphenol ◽  
Antioxidant Power ◽  
Phenolic Contents ◽  
Significant Difference ◽  
Ferric Reducing Antioxidant Power ◽  
Lager Beer

Using two methods (ferric reducing antioxidant power and radical scavenging activity), the total polyphenol content (Folin–Ciocalteu reagent) and polyphenol patterns (HPLC) in 10 commercial lager beer brands produced in Romania was determined. Samples bottled in glass, plastic and aluminium packages were analysed for each brand when available. Results have indicated considerable variations in the total and individual phenolic contents as well as antioxidant activity across beer brands. Gallic and feulic acids were the dominant phenolic compounds identified samples. The statistical analysis indicates a significant difference between the levels of antioxidant activity detected using DPPH and FRAP, for all three types of material considered. The statistical test ANOVA indicates that the polyphenol concentration is similar across all types of material.

scholarly journals Variation of Polyphenol Content and Antioxidant Activity in Some Bilberry (Vaccinium myrtillus L.) Populations from Romania

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2557
Author(s):  
Sorin Ciulca ◽  
Gheorghe Roma ◽  
Ersilia Alexa ◽  
Isidora Radulov ◽  
Ileana Cocan ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Vaccinium Myrtillus ◽  
Polyphenol Content ◽  
Total Polyphenol ◽  
Total Polyphenol Content ◽  
Modified Method ◽  
Free Radical Scavenging Assay ◽  
Vaccinium Myrtillus L ◽  
Nutraceutical Properties

Fruits of bilberry (Vaccinium myrtillus L.) are valued mainly for their nutraceutical properties, and are among the fruits with the highest antioxidant activity due to their high content of phenolic compounds. The aim of this research was to assess the total polyphenol content and antioxidant activity of fruits in six wild bilberry populations from two regions of Romania over three years. The total polyphenol content was determined according to the Folin–Ciocalteu modified method, while the antioxidant activity was evaluated using the DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assay. The Padis and Raul Lung populations registered the highest values of polyphenol content and antioxidant activity, as such the fruits of these bilberry populations could be considered potential sources of antioxidants for direct consumption or for use as ingredients for food products or food supplements. Significant variation of total polyphenol content and antioxidant activity was observed both between populations from the same region and from different regions. The low level of broad sense heritability for total polyphenol content and antioxidant activity associated with the high effects of year, and population–year interaction indicates that the accumulation of polyphenols in bilberry fruits is influenced by changes in environmental conditions.

scholarly journals Changes of antioxidant activity and active compounds content in selected teas

2020 ◽  
Vol 8 (1) ◽  
pp. 91-97
Author(s):  
Barbara Kolodziej ◽  
Sugier Danuta ◽  
Luchowska Katarzyna
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Ferric Ions ◽  
Polyphenol Content ◽  
Total Polyphenols ◽  
Total Polyphenol ◽  
Total Polyphenol Content ◽  
Tea Infusions ◽  
Anti Oxidant ◽  
Brewing Time

Our study tested 45 tea infusions classified into five groups (white, green, red, black, and other teas) for the content of total polyphenols and flavonoids, as well as antioxidant properties, by the FRAP and DPPH methods. We examined these parameters after prolongation of the brewing time from 10 to 30 min and overnight storage. The results showed that the capacity of the teas to bind free radicals was differentiated and the amount of anti-oxidant compounds depended on their nature. In terms of antioxidant activity and total polyphenol content, the tested tea types were ranked in the following order: white > green > black > red > other teas (yerba mate > rooibos). Our experiment demonstrated a positive correlation between the polyphenol content and antioxidant activity of the analyzed teas. Also, the DPPH antiradical efficiency was comparable to their ability to reduce ferric ions. The extended brewing time had a significant effect on the antioxidant activity of the infusions and the polyphenolic compounds analyzed therein. In contrast, storage of the infusions for 24 h at room temperature changed their antioxidant activity and affected the total polyphenol content.

scholarly journals Biological activity of peel and pulp of Pseudocydonia sinensis Schneid. fruits

2019 ◽  
pp. 22-28
Author(s):  
O. V. Grygorieva ◽  
S. V. Klymenko ◽  
O. N. Vergun ◽  
J. Brindza ◽  
E. Ivanišová
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Phenolic Acid ◽  
Radical Scavenging ◽  
Polyphenol Content ◽  
Total Polyphenol ◽  
Antioxidant Power ◽  
Trolox Equivalent ◽  
Chinese Quince ◽  
Positive Correlations

Pseudocydonia sinensisSchneid. (Chinese quince) fruits are an excellent source of bioactive compounds. The objective of this study was to evaluate the antioxidant activity, total polyphenol, flavonoid, and phenolic acid content of dryPseudocydonia sinensisfruits (peel and pulp) of collection fromM.M.GryshkoNationalBotanical Garden (Kyiv,Ukraine). All tested samples (peel and pulp) exhibited DPPH radical scavenging activities with values from 9.31 to 10.23 and from 5.39 to 6.85 mg TEAC/g (trolox equivalent), respectively. Antioxidant activity determined by the molybdenum reducing antioxidant power method was ranged from 122.0 to 219.31 (peel) and from 62.19 to 95.44 (pulp) mg TEAC/g of dry matter (DM). The total polyphenol content of peel and pulp was ranged from 53.17 to 78.67 and from 32.31 to 47.41 mg GAE/g (gallic acid equivalent), respectively. The total flavonoid content was ranged from 9.15 to 26.18 (peel) and from 0.55 to 0.87 mg QE/g (pulp) (equivalent to quercetin). The phenolic acids content of peel and pulp fruits was ranged from 4.40 to 8.39 and from 1.12 to 3.97 mg CAE/g (caffeic acid equivalent), respectively. The results showed that peel extracts had the highest content of bioactive compounds compared with pulp extracts. Differences between the genotypes were significant in all observed parameters. The polyphenol content presents high positive correlations between antioxidant activity and phenolic content, flavonoid, and phenolic acid. This species is potential for propagation and practice use inUkraine.

scholarly journals Influence of Packaging Material on Polyphenol Content and Antioxidant Activity in Some Commercial Beers

2020 ◽  
Author(s):  
Mihaela Mirela Bratu ◽  
Semaghiul Birghila ◽  
Antoanela Popescu ◽  
Bogdan Stefan Negreanu- Pirjol ◽  
Marius Radu
Keyword(s):  
Antioxidant Activity ◽  
Plastic Material ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Packaging Material ◽  
Polyphenol Content ◽  
Antioxidant Power ◽  
Phenolic Contents ◽  
Dpph Method ◽  
Ferric Reducing Antioxidant Power

<div><div><div><div><p>Using two methods (ferric reducing antioxidant power and radical scavenging activity), the total polyphenol content (Folin–Ciocalteu reagent) and polyphenol patterns (HPLC) in 10 commercial lager beer brands produced in Romania was determined. Samples bottled in glass, plastic and aluminium packages were analysed for each brand when available. Results have indicated considerable variations in the total and individual phenolic contents as well as antioxidant activity across beer brands. A statistical analysis was performed to assess the influence of packaging type on the antioxidant activity and phenolic content of the beers. Statistical differences were found between the DPPH and FRAP methods in glass, aluminium and plastic material. Moreover, the antioxidant activity based on the DPPH method is influenced by the type of packaging material, while in the case of FRAP method, no statistical difference was reported. Furthermore, the same analysis has shown that the polyphenol concentration is invariant to the type of material.</p></div></div></div></div>

scholarly journals Implementation of chemometric techniques for evaluation of antioxidant properties of Camellia sinensis extracts

2014 ◽  
Vol 12 (6) ◽  
pp. 700-710 ◽  
Author(s):  
Joanna Ronowicz ◽  
Bogumiła Kupcewicz ◽  
Elżbieta Budzisz
Keyword(s):  
Antioxidant Activity ◽  
Camellia Sinensis ◽  
Antioxidant Properties ◽  
Cation Radical ◽  
Polyphenol Content ◽  
Data Set ◽  
Total Polyphenol ◽  
Total Polyphenol Content ◽  
Radical Method ◽  
Chemometric Techniques

AbstractIn this study, antioxidant properties of commercial green teas and dietary supplements containing Camellia sinensis extracts were evaluated. Extracts were examined using two antioxidant assays (DPPH· radical method and ABTS·+ cation radical method). A Folin-Ciocalteu assay was used to evaluate the total polyphenol content in the extracts. In order to compare and characterize the investigated Camellia sinensis extracts, chemometric techniques based on fingerprint chromatograms, antioxidant activity and total polyphenol content were applied. Application of chemometric methods allowed for reduction of multidimensionality of the data set and grouped the samples into differentiable clusters. The relationship between the antioxidant activity and total polyphenol content was also assessed. The results indicated that extracts with the higher polyphenolic content exhibited the stronger antiradical activity against both DPPH· radicals and ABTS·+ cation radicals. The multivariate calibration technique (such as a tree regression algorithm) can be a useful tool for rapid determining the antioxidant activity of a herbal product based on its fingerprint chromatogram

scholarly journals Influence of Packaging Material on Polyphenol Content and Antioxidant Activity in Some Commercial Beers

2020 ◽  
Author(s):  
Mihaela Mirela Bratu ◽  
Semaghiul Birghila ◽  
Antoanela Popescu ◽  
Bogdan Stefan Negreanu- Pirjol ◽  
Marius Radu
Keyword(s):  
Antioxidant Activity ◽  
Plastic Material ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Packaging Material ◽  
Polyphenol Content ◽  
Antioxidant Power ◽  
Phenolic Contents ◽  
Dpph Method ◽  
Ferric Reducing Antioxidant Power

<div><div><div><div><p>Using two methods (ferric reducing antioxidant power and radical scavenging activity), the total polyphenol content (Folin–Ciocalteu reagent) and polyphenol patterns (HPLC) in 10 commercial lager beer brands produced in Romania was determined. Samples bottled in glass, plastic and aluminium packages were analysed for each brand when available. Results have indicated considerable variations in the total and individual phenolic contents as well as antioxidant activity across beer brands. A statistical analysis was performed to assess the influence of packaging type on the antioxidant activity and phenolic content of the beers. Statistical differences were found between the DPPH and FRAP methods in glass, aluminium and plastic material. Moreover, the antioxidant activity based on the DPPH method is influenced by the type of packaging material, while in the case of FRAP method, no statistical difference was reported. Furthermore, the same analysis has shown that the polyphenol concentration is invariant to the type of material.</p></div></div></div></div>

scholarly journals Antioxidant properties of different apple cultivars

2019 ◽  
Vol 7 (1-2) ◽  
pp. 23-26
Author(s):  
Judit Krisch ◽  
Kristóf Vucseta
Keyword(s):  
Total Phenolics ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Polyphenol Content ◽  
Antioxidant Power ◽  
Apple Peel ◽  
Dpph Method ◽  
Ferric Reducing Antioxidant Power ◽  
Apple Cultivars

Dietary antioxidants can be an important part of the healthy diet. Polyphenols from the commonly consumed apple can be possible sources of intake of these phytochemicals. In our study, the antioxidant properties of six apple cultivars (Golden Delicious, Granny Smiths, Idared, Jonagold, Jonagored and Mutsu) harvested at commercial maturity were examined. Flesh and skin were separated and total phenolics by the Folin-Ciocalteu assay, ferric reducing antioxidant power (FRAP) and radical scavenging activities using DPPH method were determined for each. For all apples, polyphenol content and antioxidant activity of the skin were significantly higher than that of the flesh showing that apple peel is a valuable part of the fruit. There was a good linear correlation between the polyphenol content and FRAP showing that mainly polyphenols are responsible for this type of antioxidant reaction. Regarding the cultivars, there was an obvious difference between the antioxidant activities of the examined apples. The green variety Granny Smith showed the best results followed by the red-skin apples while yellow-skin apples had the lowest activity.

scholarly journals Effect of Cocoa Bean Shell Addition on Metabolite Profile and Antioxidant Activity of Herbal Infusions

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Maria Quijano-Avilés ◽  
Ivan Chóez-Guaranda ◽  
Rafael Viteri ◽  
Ana Barragán-Lucas ◽  
Daynet Sosa ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Metabolite Profile ◽  
Gas Chromatography Mass Spectrometry ◽  
Cocoa Bean ◽  
Polyphenol Content ◽  
Total Polyphenol ◽  
Antioxidant Power ◽  
Ferric Reducing Antioxidant Power ◽  
Herbal Infusions

Cocoa bean shell (CBS) is a by-product with aromatic characteristics that can enhance the aroma and bioactivity of herbal infusions. This study was aimed to determine the effect of the addition of cocoa bean shell on the metabolite profile and antioxidant activity of infusions made with Ilex guayusa and Vernonanthura patens and their mixtures. Metabolite profile was analyzed by gas chromatography–mass spectrometry combined with multivariate analysis. Total polyphenol content and flavonoids were determined by the Folin-Ciocalteu method and by the flavonoid-AlCl3 complex, respectively. Antioxidant activities were measured by the decolorization assay of the 2,2-diphenyl-1-picrylhydrazyl radical and the ferric reducing antioxidant power. The results revealed that the addition of CBS increases the content of phenolic acids in the infusions (caffeic acid, 4-hydroxybenzoic acid, and pyrocatechol). Nonetheless, the antioxidant activity of the infusions decreased with the addition of CBS (16.21 to 2.74 TEAC). Carboxylic acids and derivatives, major compounds present in the infusions prepared with V. patens, were the metabolites that showed the highest correlation with the antioxidant activity. This study suggests that the infusions made with CBS present a profile of metabolites different from the infusions of I. guayusa, V. patens, and their mixtures.

scholarly journals Synthesis and antioxidant properties of 2-(3-(hydroxyimino)methyl)-1H-indol-1-yl)acetamide derivatives

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Chandravadivelu Gopi ◽  
Magharla Dasaratha Dhanaraju
Keyword(s):  
Antioxidant Activity ◽  
Condensation Reaction ◽  
Antioxidant Properties ◽  
Side Chain ◽  
Antioxidant Power ◽  
H Nmr ◽  
Antioxidant Agents ◽  
Phenyl Rings ◽  
Ferric Reducing Antioxidant Power ◽  
Ft Ir

Abstract Background The main aim of this work was to synthesise a novel N-(substituted phenyl)-2-(3-(hydroxyimino) methyl)-1H-indol-1-yl) acetamide derivatives and evaluate their antioxidant activity. These compounds were prepared by a condensation reaction between 1H-indole carbaldehyde oxime and 2-chloro acetamide derivatives. The newly synthesised compound structures were characterised by FT-IR, 1H-NMR, mass spectroscopy and elemental analysis. Furthermore, the above-mentioned compounds were screened for antioxidant activity by using ferric reducing antioxidant power (FRAP) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) methods. Result The antioxidant activity result reveals that most of the compounds were exhibiting considerable activity in both methods and the values are very closer to the standards. Among the synthesised compounds, compound 3j, 3a and 3k were shown remarkable activity at low concentration. Conclusion Compounds 3j, 3a and 3k were shown highest activity among the prepared analogues due to the attachment of halogens connected at the appropriate place in the phenyl ring. Hence, these substituted phenyl rings considered as a perfect side chain for the indole nucleus for the development of the new antioxidant agents.

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