Singlet oxygen scavenging by α-tocopherol and β-carotene: Kinetic studies in phospholipid membranes and ethanol solution

BioFactors ◽  
1998 ◽  
Vol 7 (1-2) ◽  
pp. 31-40 ◽  
Author(s):  
Kenji Fukuzawa ◽  
Yasuki Inokami ◽  
Akira Tokumura ◽  
Junji Terao ◽  
Asahi Suzuki
Keyword(s):  
Singlet Oxygen ◽  
Kinetic Studies ◽  
Ethanol Solution ◽  
Phospholipid Membranes ◽  
Oxygen Scavenging ◽  
Β Carotene

Kinetic studies of excited singlet oxygen atom O( 1 D) reactions with ethanol

2021 ◽  
Author(s):  
Hongtao Zhong ◽  
Chao Yan ◽  
Chu C. Teng ◽  
Timothy Y. Chen ◽  
Gerard Wysocki ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Singlet Oxygen ◽  
Kinetic Studies ◽  
Excited Singlet

scholarly journals Singlet oxygen scavenging by leaf flavonoids contributes to sunlight acclimation in Tilia platyphyllos

2014 ◽  
Vol 100 ◽  
pp. 1-9 ◽  
Author(s):  
Petra Majer ◽  
Susanne Neugart ◽  
Angelika Krumbein ◽  
Monika Schreiner ◽  
Éva Hideg
Keyword(s):  
Singlet Oxygen ◽  
Oxygen Scavenging ◽  
Tilia Platyphyllos

Temperature effect on electronic and vibrational properties of β-carotene aggregates in aqueous ethanol solution

2019 ◽  
Vol 166 ◽  
pp. 323-329 ◽  
Author(s):  
Fang Qu ◽  
Haoyang Fu ◽  
Yeqiu Li ◽  
Chenglin Sun ◽  
Zuowei Li ◽  
...  
Keyword(s):  
Temperature Effect ◽  
Aqueous Ethanol ◽  
Ethanol Solution ◽  
Vibrational Properties ◽  
Aqueous Ethanol Solution ◽  
Β Carotene

Article

1998 ◽  
Vol 76 (12) ◽  
pp. 1805-1816
Author(s):  
L Ross C Barclay ◽  
Jennifer K Grandy ◽  
Heather D MacKinnon ◽  
Heather C Nichol ◽  
Melinda R Vinqvist
Keyword(s):  
Oxygen Uptake ◽  
Singlet Oxygen ◽  
Sodium Azide ◽  
Lignin Content ◽  
Sodium Dodecyl ◽  
Kinetic Studies ◽  
Product Distribution ◽  
Geometrical Isomers ◽  
Photo Oxidation ◽  
Tert Butyl

3,5-Di-tert-butyl-ortho-quinone, 6, and 1-(3,4-dimethoxyphenyl-2-(2-methoxyphenoxy)-1-propanone, 7, models for oxidized lignin and for lignin, were used as sensitizers of photo-oxidation. Product studies by HPLC from oxidation of methyl linoleate in solution sensitized by 6 or 7, and in sodium dodecyl sulfate (SDS) sensitized by 6, showed a product distribution of six hydroperoxides, the four conjugated 9- and 13-hydroperoxides of the geometrical isomers: trans-10, cis-12 (2), cis-9, trans-11 (3), trans-10, trans-12 (4), and trans-9, trans-11 (5)-octadecadienoates plus two nonconjugated hydroperoxides. The higher cis/trans to trans/trans (ct/tt) of geometrical isomers (2 + 3//4 + 5) compared to ct/tt from known thermal free-radical peroxidations (Type 1) indicate that singlet oxygen (Type 2) oxidation occurs in reactions sensitized by 6 or 7. Kinetic studies by oxygen uptake are reported on oxidations of hydrocarbons 1-phenyl-2-methylpropene,8, and trans-stilbene,9, sensitized by the quinone, 6, or by a dye, Rose Bengal. Quenching studies imply singlet oxygen reactions. Milled wood lignin undergoes self-initiated photo-oxidation in water, and oxygen uptake was quenched by sodium azide. Cellobiose, a cellulose model, undergoes sensitized photo-oxidation using model quinone, 6, in a mixture of tert-butyl alcohol and water or using the sensitizers benzophenone or the lignin model, 7, delivered on a solid support, silica gel, and these oxidations were quenched with sodium azide. These results implicate singlet oxygen in the photo-yellowing of high lignin content wood pulps.Key words: lignin models, ortho-quinone, photo-oxidation, singlet oxygen, lignin, cellobiose.

β-carotene inhibits UVA-induced matrix metalloprotease 1 and 10 expression in keratinocytes by a singlet oxygen-dependent mechanism

2004 ◽  
Vol 37 (5) ◽  
pp. 654-670 ◽  
Author(s):  
Karin Wertz ◽  
Nicole Seifert ◽  
Petra Buchwald Hunziker ◽  
Georges Riss ◽  
Adrian Wyss ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Matrix Metalloprotease ◽  
Β Carotene ◽  
Dependent Mechanism

Kinetic Studies of Singlet Oxygen [4 + 2]-Cycloadditions with Cyclic 1,3-Dienes in 28 Solvents

1995 ◽  
Vol 117 (36) ◽  
pp. 9159-9164 ◽  
Author(s):  
Jean-Marie Aubry ◽  
Bernadette Mandard-Cazin ◽  
Michel Rougee ◽  
Rene V. Bensasson
Keyword(s):  
Singlet Oxygen ◽  
Kinetic Studies
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