UV ‐irradiation influence on free radical formation and radical scavenging ability of caffeic acid— EPR , UV‐Vis , and colorimetric examination

2021 ◽  
Author(s):  
Adam Bogacz ◽  
Małgorzata Stec ◽  
Paweł Ramos ◽  
Barbara Pilawa
Keyword(s):  
Free Radical ◽  
Caffeic Acid ◽  
Uv Irradiation ◽  
Radical Scavenging ◽  
Radical Formation ◽  
Free Radical Formation ◽  
Radical Scavenging Ability

Interaction of cytokinins with lipid-associated oxy free radicals during senescence: a prospective mode of cytokinin action

1984 ◽  
Vol 62 (12) ◽  
pp. 2943-2949 ◽  
Author(s):  
Ya'acov Y. Leshem
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Xanthine Oxidase ◽  
Radical Scavenging ◽  
Free Radical Scavenger ◽  
Radical Formation ◽  
Radical Scavenger ◽  
Substrate Affinity ◽  
Xanthine Oxidase Inhibitors ◽  
Free Radical Formation

In senescence physiology, experimental data indicate causative relationships among cytokinin, lipoxygenation, anti-oxidation, and lipid-associated free radical scavenging. During both normal and induced senescence, there is a rise in lipoxygenase (LOX) which catalyzes the oxidation of polyunsaturated fatty acids containing the cis, cis-1,4-pentadiene configuration. These include linoleic and linolenic acids, which are of common occurrence in plants and inter alia may be situated in membranal phospholipids. Lipoxygenation causes the production of free radicals such as the superoxide, fatty acid, and peroxy species. Cytokinin (CK) lowers LOX and superoxide dismutase activities significantly in senescing foliage and is mimicked by the endogenous lipid antioxidant, α-tocopherol (vitamin E), in its chlorophyll-retaining and LOX-lowering effects. Further experimentation indicated that CK interaction with free radicals may occur in two ways, (i) CK may act as a direct free radical scavenger by virtue of the fact that the hydrogens of the α-carbon atom in the amine bond can be extracted, resulting in the formation of an amide: [Formula: see text][Formula: see text] (this mechanism may also, in part, explain polyamine effects), (ii) CK may serve as an incipient preventative of free radical formation by inhibiting oxidation of plant purine compounds, which at certain stages of breakdown release superoxide and hydroxyl free radicals. This effect is probably associated with a lowering of substrate affinity for xanthine oxidase. This assumption is further borne out by similar senescence-retarding effects of selective xanthine oxidase inhibitors such as allopurinol. These observations collectively indicate that prevention of free radical formation and (or) their direct scavenging should be included in the multifactorial antisencscence mode of action of cytokinin.

Inhibition of Procarcinogen Activating Enzyme CYP1A2 Activity and Free Radical Formation by Caffeic Acid and its Amide Analogues

2016 ◽  
Vol 10 (3) ◽  
pp. 187-194 ◽  
Author(s):  
Paitoon Narongchai ◽  
Kanokporn Niwatananun ◽  
Siripun Narongchai ◽  
Winthana Kusirisin ◽  
Churdsak Jaikang
Keyword(s):  
Free Radical ◽  
Caffeic Acid ◽  
Radical Formation ◽  
Cyp1a2 Activity ◽  
Free Radical Formation

In vivo thiyl free radical formation from hemoglobin following administration of hydroperoxides

1990 ◽  
Vol 277 (2) ◽  
pp. 402-409 ◽  
Author(s):  
Kirk R. Maples ◽  
Christopher H. Kennedy ◽  
Sandra J. Jordan ◽  
Ronald P. Mason
Keyword(s):  
Free Radical ◽  
Radical Formation ◽  
Free Radical Formation

scholarly journals Hydralazine-dependent carbon dioxide free radical formation by metabolizing mitochondria.

1988 ◽  
Vol 263 (23) ◽  
pp. 11296-11301 ◽  
Author(s):  
P K Wong ◽  
J L Poyer ◽  
C M DuBose ◽  
R A Floyd
Keyword(s):  
Carbon Dioxide ◽  
Free Radical ◽  
Radical Formation ◽  
Free Radical Formation

Biochemical Mechanisms for Oxygen Free Radical Formation During Exercise

1990 ◽  
Vol 10 (4) ◽  
pp. 236-254 ◽  
Author(s):  
Bertil Sjödin ◽  
Ylva Hellsten Westing ◽  
Fred S. Apple
Keyword(s):  
Free Radical ◽  
Oxygen Free Radical ◽  
Radical Formation ◽  
Biochemical Mechanisms ◽  
Free Radical Formation

Comparison between sonodynamic effect and photodynamic effect with photosensitizers on free radical formation and cell killing

2006 ◽  
Vol 13 (6) ◽  
pp. 535-542 ◽  
Author(s):  
Wakako Hiraoka ◽  
Hidemi Honda ◽  
Loreto B. Feril ◽  
Nobuki Kudo ◽  
Takashi Kondo
Keyword(s):  
Free Radical ◽  
Cell Killing ◽  
Radical Formation ◽  
Photodynamic Effect ◽  
Free Radical Formation
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