Phenolic antioxidants – radical-scavenging and chain-breaking activity: A comparative study

2009 ◽  
Vol 111 (11) ◽  
pp. 1072-1089 ◽  
Author(s):  
Vessela D. Kancheva
Keyword(s):  
Comparative Study ◽  
Radical Scavenging ◽  
Phenolic Antioxidants ◽  
Chain Breaking

scholarly journals Evaluation antioxidant activity and corrosion inhibition of C38 in Hydrochloric acid medium by dried lemon peels of Kenitra Marrakech cities in Morocco and Taiz town in Yemen: A Comparative study

2021 ◽  
Vol 119 ◽  
pp. 04001
Author(s):  
Khaled Abdu ◽  
Rahma Erahioui ◽  
Khadija Khedid ◽  
Hefdhal deen ◽  
Maha Elhawary ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Comparative Study ◽  
Corrosion Inhibition ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
Fatty Tissue ◽  
Scavenging Activity ◽  
Ic50 Values

This paper presents a comparative study about the evaluation of antioxidant activity and corrosion inhibition in Kenitra, Marrakesh and Taiz. An interesting topic, indeed polyphenols can improve or help to reduce oxidative stress in the treatment of digestive problems, weight management difficulties, diabetes, hypertension, arteriosclerosis and damage fatty tissue. Therefore, the authors deal with the measurement of polyphenol content and evaluation of the antioxidant activity of lemon peels in Kenitra , Marrakesh and Taiz.The authors performs empirical analyzes on lemon peels. The total polyphenol contents of the ethanolic extract of lemon peels were measured. It was to be 30. 23, 26. 346 and 20.961 mg/CE/g in Kenitra, Marrakech, and Taiz, respectively. Moreover, the DPPH radical scavenging activity of ethanolic extract of dried lemon peels was higher than 200μg/ml concentration. They were 73.47%, 47.36%, and 32.09in Kenitra, Marrakech, and Taiz, respectively. Also, the IC50 values of ethanolic extracts calculated from the percentage inhibitions at the same concentration. Inhibition (IC50) which obtained in Kenitra was 123.089 μg/ml. It was lower compared to the ethanol extract of Marrakech and Taiz that were 197.418, 276.750μg/mL, respectively. Therefore, the extract which is containing a high amount of phenolic is showed high radical scavenging activity. In addition, the maximum inhibition efficiencies for 2 mL L-1 of the inhibitor at 298 k were 98, 12% and 84, 85 % in Kenitra and Taiz, respectively. These values obtained through polarization curve measurements.

scholarly journals A Comparative Study on Antioxidant Properties of Two Phyllanthus Species Growing in Bangladesh

2013 ◽  
Vol 11 (2) ◽  
pp. 191-197 ◽  
Author(s):  
Ishrat Nimmi ◽  
Ismet Ara Jahan ◽  
M Hemayet Hossain ◽  
Mohammad Burhan Uddin ◽  
M Sohel Rana ◽  
...  
Keyword(s):  
Comparative Study ◽  
Methanol Extract ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Test Methods ◽  
Total Phenolic ◽  
Solvent Volume

A comparative study of antioxidant properties on two varieties of Phyllanthus (Phyllanthus niruiri L. & Phyllanthus urinaria L. leaves) growing in Bangladesh was done in the present study. Five complimentary test methods namely DPPH free radical scavenging activity, reducing power assay, total antioxidant capacity, total phenolic and flavonoid contents determination were used for the evaluation of antioxidant properties of two species of Phyllanthus. In the present investigation for the evaluation of antioxidant activities the concentration is expressed by the ratio of crude sample per solvent volume instead of extract weight per solvent volume. Based on these concentrations the investigated P. niruri L. and P. urinaria L. leaves extracts exhibited significant results. At 2 mg/ml concentration DPPH radical scavenging capacity of the methanol extract of both the plants was found to show significant (>90%) activity which is comparable to Ascorbic acid and BHA. In case of reducing power tests for both the extract, the activity of P. urinaria is comparable to that of BHA and AA and that of P. niruiri is comparable to BHA. P. niruiri showed better antioxidant potential than that of P. urinaria based on the observed results of their corresponding methanol extract. DOI: http://dx.doi.org/10.3329/dujps.v11i2.14579 Dhaka Univ. J. Pharm. Sci. 11(2): 191-197, 2012 (December)

scholarly journals Synthesis of Polylactic Acid Initiated through Biobased Antioxidants: Towards Intrinsically Active Food Packaging

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1183 ◽  
Author(s):  
Marco Aldo Ortenzi ◽  
Stefano Gazzotti ◽  
Begonya Marcos ◽  
Stefano Antenucci ◽  
Stefano Camazzola ◽  
...  
Keyword(s):  
Ring Opening ◽  
Food Packaging ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Phenolic Antioxidants ◽  
Vanillyl Alcohol ◽  
Biodegradable Material ◽  
Active Food Packaging ◽  
Polymer Bearing

Polylactide (PLA)-based polymers, functionalized with biobased antioxidants, were synthesized, to develop an intrinsically active, biobased and potentially biodegradable material for food packaging applications. To achieve this result, phenolic antioxidants were exploited as initiators in the ring opening polymerization of l-lactide. The molecular weight, thermal properties and in vitro radical scavenging activity of the polymers obtained were compared with the ones of a PLA Natureworks 4043D, commonly used for flexible food packaging applications. The most promising synthesized polymer, bearing vanillyl alcohol as initiator (PLA-VA), was evaluated for active food packaging applications. Packaging with PLA-VA films reduced color and fat oxidation of salami during its shelf life.

Antioxidant properties, radical scavenging activity and biomolecule protection capacity of flavonoid naringenin and its glycoside naringin: a comparative study

2010 ◽  
Vol 90 (7) ◽  
pp. 1238-1244 ◽  
Author(s):  
Monica Cavia-Saiz ◽  
Maria D Busto ◽  
Maria Concepción Pilar-Izquierdo ◽  
Natividad Ortega ◽  
Manuel Perez-Mateos ◽  
...  
Keyword(s):  
Comparative Study ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Scavenging Activity

scholarly journals Screening Olive Leaves from Unexploited Traditional Greek Cultivars for Their Phenolic Antioxidant Dynamic

Foods ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 197 ◽  
Author(s):  
Vassiliki Papoti ◽  
Maria Papageorgiou ◽  
Konstantina Dervisi ◽  
Evangelos Alexopoulos ◽  
Konstantinos Apostolidis ◽  
...  
Keyword(s):  
Radical Scavenging ◽  
Sampling Period ◽  
Total Phenol ◽  
Phenolic Antioxidant ◽  
Phenolic Antioxidants ◽  
Total Phenol Content ◽  
Olive Leaf ◽  
Aqueous Methanol ◽  
Ethanol Extracts ◽  
Promising Source

Quality characteristics of olive products significantly depend on cultivar (cv), among other factors. In this study, seven traditional, noncommercial Greek cultivars, along with the commercial Spanish Arbequina cv., were examined for the phenolic antioxidant dynamic of their leaves. Polar extracts (aqueous, methanol, and ethanol) were analyzed for Total Phenol (TP), Flavonoid (TFL), Hydroxycinnamic Acid Derivatives (THAD), Flavonol (TFLVN) contents, DPPH radical scavenging ability, and Ferric Reducing Capacity (FRAP). Selective characteristics of olive leaf methanol extracts for all cultivars were re-examined on a second sampling period. Olive leaf is considered a rich source of phenolic antioxidants total phenol content reaching 29.3 ± 1.3, 30.6 ± 0.4, and 27.0 ± 1.1 mg caffeic acid/g dry leaf for aqueous, methanol, and ethanol extracts, respectively) and all cultivars were considered of equal bioactive dynamic. TP data derived from Folin–Ciocalteu and another spectrophotometric assay employed presented a high correlation for all examined cases (R2 = 71.5–86.9%). High correlation (R2 = 0.92) was also found between TP and FRAP findings of aqueous extracts. Olive leaf is considered a promising source of phenolic antioxidants irrelevant to cultivar and therefore even cultivars less effective for oil or table olive production could be efficiently exploited for the bioactive dynamic of their leaves.

Free radical scavenging and cytoprotective activities of phenolic antioxidants

2006 ◽  
Vol 50 (11) ◽  
pp. 996-1005 ◽  
Author(s):  
Jingli Zhang ◽  
Roger A. Stanley ◽  
Aselle Adaim ◽  
Laurence D. Melton ◽  
Margot A. Skinner
Keyword(s):  
Free Radical ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Phenolic Antioxidants

Radical Scavenging Capacity of Seeds and Leaves Ethanol Extracts ofCynara Scolymus L.—A Comparative Study

2012 ◽  
Vol 26 (sup1) ◽  
pp. 151-155 ◽  
Author(s):  
E. Georgieva ◽  
Y. Karamalakova ◽  
G. Nikolova ◽  
B. Grigorov ◽  
D. Pavlov ◽  
...  
Keyword(s):  
Comparative Study ◽  
Radical Scavenging ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Ethanol Extracts
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