scholarly journals Finding of Remarkable Synergistic Effect on the Aroxyl-Radical-Scavenging Rates (ks) under the Coexistence of Vitamin E Homologues (or Vegetable Oils) and Ubiquinol-10: Proposal of A New Mechanism to Explain An Increase of ks Value

2020 ◽  
Vol 69 (10) ◽  
pp. 1241-1255
Author(s):  
Kazuo Mukai ◽  
Yasuhiro Maruoka ◽  
Saya Kitagaki ◽  
Shin-ichi Nagaoka
Keyword(s):  
Vitamin E ◽  
Synergistic Effect ◽  
Vegetable Oils ◽  
Radical Scavenging ◽  
Scavenging Rates

Finding of remarkable synergistic effect on the aroxyl‐radical‐scavenging rates under the coexistence of α‐tocopherol and catechins

2019 ◽  
Vol 51 (9) ◽  
pp. 643-656 ◽  
Author(s):  
Kazuo Mukai ◽  
Kanae Nagai ◽  
Aya Ouchi ◽  
Tomomi Suzuki ◽  
Katsuhiro Izumisawa ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Radical Scavenging ◽  
Scavenging Rates

Rapid assay of vitamin?E in vegetable oils by reversed-phase capillary electrochromatography

2005 ◽  
Vol 26 (4-5) ◽  
pp. 798-803 ◽  
Author(s):  
Zeineb Aturki ◽  
Giovanni D'Orazio ◽  
Salvatore Fanali
Keyword(s):  
Vitamin E ◽  
Vegetable Oils ◽  
Capillary Electrochromatography ◽  
Reversed Phase ◽  
Rapid Assay

Vitamin E content of crude and refined vegetable oils in Southern Brazil

1988 ◽  
Vol 1 (3) ◽  
pp. 231-238 ◽  
Author(s):  
Indrajit D. Desai ◽  
Hemmige Bhagavan ◽  
Richard Salkeld ◽  
Jose E. Dutra de Oliveira
Keyword(s):  
Vitamin E ◽  
Vegetable Oils ◽  
Southern Brazil

Potent Free Radical Scavenging Activity of Propol Isolated from Brazilian Propolis

1997 ◽  
Vol 52 (11-12) ◽  
pp. 828-833 ◽  
Author(s):  
Purusotam Basnet ◽  
Tetsuya Matsuno ◽  
Richard Neidlein
Keyword(s):  
Free Radical ◽  
Vitamin E ◽  
Superoxide Anion ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Water Extract ◽  
Free Radical Scavenging ◽  
Free Radical Scavenging Activity ◽  
Scavenging Activity ◽  
Brazilian Propolis

Abstract We evaluated free radical scavenging activity of the water, methanol and chloroform ex­tracts of propolis in 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and xanthine-xanthine oxidase (XOD) generated superoxide anion assay systems. The free radical scavenging activity guided fractionation and chemical analysis led to the isolation of a new compound, propol {3-[4-hydroxy-3-(3-oxo-but-1-enyl)-phenyl]-acrylic acid) from the water extract, which was more potent than most common antioxidants such as vitamin C and vitamin E (α-tocopherol) in these assay systems.

scholarly journals IN VITRO ANTIOXIDANT AND FREE RADICAL SCAVENGING POTENTIAL OF METHANOLIC EXTRACTS OF UVARIA CHAMAE LEAVES AND ROOTS

2019 ◽  
Vol 11 (1) ◽  
pp. 67
Author(s):  
Nwokolo Lorreta Nwakaego ◽  
Onyekwelu Kenechukwu Chibuike ◽  
Ene Martin Chukwugekwu ◽  
Adilieje Chioma Marylyn ◽  
Ezechukwu Ifunanya Ngozi ◽  
...  
Keyword(s):  
Free Radical ◽  
Vitamin E ◽  
Vitamin A ◽  
Vitamin C ◽  
Leaf Extract ◽  
Superoxide Radical ◽  
Radical Scavenging ◽  
Root Extract ◽  
Leaves And Roots

Objective: This study investigated the in vitro antioxidant and free radical potentials of methanol extracts of Uvaria chamae leaves and roots.Methods: Fresh Uvaria chamae leaves and roots were air dried, pulverized and extracted using methanol. Phytochemical, total phenolic, flavonoids, antioxidant and tannin contents, DPPH, hydroxyl, and superoxide radical scavenging properties of the extracts were determined using standard methods.Results: In vitro antioxidant potentials revealed that methanol extract of Uvaria chamae leaves contains vitamin A (4871±79.21 I. U) and vitamin C (1.72±0.02%) while the root extract contains vitamin A (673.28±0.00I. U) and vitamin C (1.66±0.01%). Both extracts had equal contents of vitamin E (8.83±0.04 mg/100g). The leaf extract scavenged 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) in a concentration dependent manner with the correlation coefficient (R2) of 0.839 and effective concentration (EC50) of 31.19 µg/ml, while the root extract scavenged DPPH with R2 of0.778 and EC50 of 14.00 µg/ml. The leaf and root extracts scavenged superoxide radical and hydroxyl radical with EC50 of 5.93 µg/ml and 719.45 µg/ml; 107.89 µg/ml and 912.01 µg/ml respectively compared to the EC50 of ascorbic standard (30.27 µg/ml) and EC50 of vitamin E standard (106.66µg/ml) respectively. The leaf extract showed significantly higher (p<0.05) anti radical power (ARP) of superoxide (0.17) compared to the root extract (0.0014) and the root extract showed significantly higher (p<0.05) ARP of DPPH (0.071) compared to the leaf extract (0.032).Conclusion: The leaves and roots of Uvaria chamae are rich in natural antioxidants that can be exploited in the treatment of diseases related to oxidative stress.

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