Results 111 to 120 of about 1,173 (152)

A chiral furocoumarin

Acta Crystallographica Section C Crystal Structure Communications, 2000
The furocoumarin 1,2-dihydro-2-(1,2-dihydroxyprop-2-yl)-8H-furo[2,3-h]benzopyran-8-one crystallizes from methanol-water as the monohydrate C(14)H(14)O(5).H(2)O. Both chiral centers have the S configuration. Both OH groups and both H atoms of the water molecule form intermolecular hydrogen bonds with O.O distances in the range 2.7686 (18)-2.8717 (18) A.
F H, Billiot, D R, Billodeaux, S F, Watkins, F R, Fronczek   +3 more
openaire   +2 more sources

Photoreactions of furocoumarins with biomolecules

Journal of Photochemistry and Photobiology B: Biology, 1990
Recent aspects of the photoreactions of linear and angular furocoumarins with DNA and related compounds, including [2 + 2] cycloaddition to pyrimidine bases, covalent attachment to the osidic moiety of adenine nucleosides and photodynamic effects, are surveyed.
J, Cadet, P, Vigny, W R, Midden
openaire   +2 more sources

SINGLET OXYGEN GENERATION BY FUROCOUMARIN TRIPLET STATES—I. LINEAR FUROCOUMARINS (PSORALENS)

Photochemistry and Photobiology, 1986
Abstract— Triplet extinction coefficients and hence singlet → triplet intersystem crossing quantum yields have been measured in benzene for a number of linear furocoumarins including pseudopsoralen, 5, 8‐dimethoxypsoralen, 4, 5′, 8‐trimethylpsoralen and 3‐carbethoxypseudopsoralen.
C N, Knox, E J, Land, T G, Truscott
openaire   +2 more sources

Furocoumarins ofKomarovia anisospermum

Chemistry of Natural Compounds, 1976
Three furocoumarins have been isolated from the roots ofKomarovia anisospermum Korov.: isoimperatorin, phellopterin, and 8-geranyloxy-5-methoxypsoralen. This is the first time that the last-mentioned of these substances has been isolated in the pure state.
A. I. Sokolova, Yu. E. Sklyar, M. E. Perel'son, M. G. Pimenov   +3 more
openaire   +1 more source

Dietary exposure to furocoumarins

Regulatory Toxicology and Pharmacology, 1991
Natural furocoumarins, some of which are carcinogenic, are widespread components of the diet which are frequently consumed. Because of the paucity of samples, the wide scatter of analytical values, and other limitations in the data, only broad conclusions can be drawn.
openaire   +2 more sources

FLUORESCENCE LIFETIMES OF ANGULAR FUROCOUMARINS

Photochemistry and Photobiology, 1987
AbstractProperties of singlet states of a range of non‐substituted and aceto‐substituted angular furocoumarins as investigated by the technique of time‐resolved fluorescence are reported. In the three solvents studied, water, ethanol and benzene, a variety of 1, 2 or 3 fluorescence lifetime components were found and resolved, the importance of which ...
Andreoni A, CUBEDDU, RINALDO, Knox CN, Truscott TG   +3 more
openaire   +3 more sources

Minor furocoumarins of Murraya koenigii

Fitoterapia, 2000
Xanthotoxin, isobyakangelicol, phellopterin, gosferol, neobyakangelicol, byakangelicol, byakangelicin and isogosferol are reported as minor furocoumarins of Murraya koenigii seeds.
A C, Adebajo, J, Reisch
openaire   +2 more sources

Furocoumarins ofCnidium dubium

Chemistry of Natural Compounds, 1966
1. Paper chromatography has shown that the fruit ofC. dubium contains not less than eight substances of coumarinic nature; six of these (A, B, C, D, E, and H) have been isolated in the crystalline state. 2. Substances B, D, and E are identical with isoimperatorin, imperatorin, and oxypeucedanin, respectively.
N. F. Komissarenko, V. T. Chernobai
openaire   +1 more source

Furocoumarins from Angelica pachycarpa

Phytochemistry, 1983
Abstract A novel furocoumarin isolated from unripe fruits of Angelica pachycarpa has been characterized as (+)-tert- O -methylbyakangelicin. (+)-tert- O -Methyloxypeucedanin hydrate, neobyakangelicol, (±)-byakangelicol, (+)-byakangelicin, phellopterin, isoimperatorin, oxypeucedanin, oxypeucedanin hydrate, pangeline and umbelliprenin were also ...
J. Méndez, J. Castro-Poceiro
openaire   +1 more source

Photobiology of Furocoumarins

1982
The photobiology of fucoroumarins has been covered by a number of reviews (1–4). In recent years we observed a rapid evolution in the knowledge on naturally occurring or synthetic furocoumarins which in the presence of near ultraviolet light or UVA, i.e. radia tion in the range of 320 to 380 nm, exhibit photosensitizing properties in various biological
openaire   +1 more source