Activity correlation among singlet-oxygen quenching, free-radical scavenging and excited-state proton-transfer in hydroxyflavones: Substituent and solvent effects

2021 ◽  
pp. 113122
Author(s):  
Shin-Ichi Nagaoka ◽  
Yuki Bandoh ◽  
Satoki Matsuhiroya ◽  
Kazumasa Inoue ◽  
Umpei Nagashima ◽  
...  
Keyword(s):  
Excited State ◽  
Free Radical ◽  
Proton Transfer ◽  
Singlet Oxygen ◽  
Solvent Effects ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching ◽  
Excited State Proton Transfer

scholarly journals Antioxidant Protection from UV- and Light-Stress Related to Carotenoid Structures

Antioxidants ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 219 ◽  
Author(s):  
Gerhard Sandmann
Keyword(s):  
Singlet Oxygen ◽  
Antioxidant Activities ◽  
Light Stress ◽  
Radical Scavenging ◽  
Hydroxyl Groups ◽  
Minor Importance ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching ◽  
Living Organisms

This review summarizes studies of protection against singlet oxygen and radical damage by carotenoids. The main focus is on how substitutions of the carotenoid molecules determine high antioxidant activities such as singlet oxygen quenching and radical scavenging. Applied assays were carried out either in vitro in solvents or with liposomes, and in a few cases with living organisms. In the latter, protection by carotenoids especially of photosynthesis against light- and UV-stress is of major importance, but also heterotrophic organisms suffer from high light and UV exposure which can be alleviated by carotenoids. Carotenoids to be compared include C30, C40 and C50 molecules either acyclic, monocyclic or bicyclic with different substitutions including sugar and fatty acid moieties. Although some studies are difficult to compare, there is a tendency towards mono and bicyclic carotenoids with keto groups at C-4/C-4’ and the longest possible polyene structure functions to act best in singlet oxygen quenching and radical scavenging. Size of the carotenoid and lipophilic substituents such as fatty acids seem to be of minor importance for their activity but hydroxyl groups at an acyclic end and especially glycosylation of these hydroxyl groups enhance carotenoid activity.

Radical Scavenging and Singlet Oxygen Quenching Activity of Marine Carotenoid Fucoxanthin and Its Metabolites

2007 ◽  
Vol 55 (21) ◽  
pp. 8516-8522 ◽  
Author(s):  
Nakkarike M. Sachindra ◽  
Emiko Sato ◽  
Hayato Maeda ◽  
Masashi Hosokawa ◽  
Yoshimi Niwano ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Radical Scavenging ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching

scholarly journals Radical scavenging and singlet oxygen quenching activity of extracts from Indian seaweeds

2010 ◽  
Vol 47 (1) ◽  
pp. 94-99 ◽  
Author(s):  
N. M. Sachindra ◽  
M. K. W. A. Airanthi ◽  
M. Hosokawa ◽  
K. Miyashita
Keyword(s):  
Singlet Oxygen ◽  
Radical Scavenging ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching

scholarly journals Daily Radical Scavenging and Singlet Oxygen Quenching Capacity Intake from Fruits and Vegetables in Japan

2018 ◽  
Vol 24 (5) ◽  
pp. 921-933 ◽  
Author(s):  
Shingo Takahashi ◽  
Ayaka Tsutsumi ◽  
Koichi Aizawa ◽  
Hiroyuki Suganuma
Keyword(s):  
Singlet Oxygen ◽  
Fruits And Vegetables ◽  
Radical Scavenging ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching
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