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- W2054453260 abstract "Abstract Singlet molecular oxygen O 2 ( 1 Δ g ) is a reactive oxygen species capable of damaging biological molecules and triggering oxidative stress. The quenching of this species by naturally occurring furans was measured using O 2 ( 1 Δ g ) from two different sources: (1) the thermal decomposition of 1,4-dimethylnaphthalene endoperoxide (1,4-DMNO 2 ); (2) tetraphenylporphyrin sulphonate photosensitization. Four furan diterpenes were isolated from alcoholic extracts of Sucupira branca (Pterodon sp., Leguminosae) seeds, which are used for the treatment of rheumatic diseases, suggesting anti-inflammatory activity. Using time-resolved near-IR (NIR) emission after photosensitization, the overall (physical + chemical) O 2 ( 1 Δ g ) quenching rate constants by these compounds were found to be of the order of 10 8 M −1 s −1 , with the exception of the conjugated furan diterpenes 3,5,6-trimethoxy-7,8-furano-3′,4′-methylenedioxy-2″,3″-flavane and 3,4,5,6-tetramethoxy-7,8-furano-2″,3″-flavane for which 20-fold lower values were observed. These lower values are attributed to the conjugation of the furan moiety with the aromatic ring, which prevents (2 + 4) cucloaddition of O 2 ( 1 Δ g ) to the furan ring. Although the non-conjugated furans exhibit a low scavenging effect on lipid peroxidation in microsomes, their high O 2 ( 1 Δ g ) quenching constant may minimize the extent of tissue damage associated with the inflammatory process." @default.
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- W2054453260 date "1997-04-01" @default.
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- W2054453260 title "Quenching of singlet molecular oxygen by natural furan diterpenes" @default.
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- W2054453260 doi "https://doi.org/10.1016/s1011-1344(96)07444-1" @default.
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