It exists in plants of several families, such as: Cyperaceae, Dipterocarpaceae, Gnetaceae, Fabaceae, Leguminoseae, Pinaceae, Poaceae, and Vitaceae, and is synthesized from the phenylpropanoid substrates that are present in all higher plants and it also involves the activity of stilbene
synthase or resveratrol synthase (STS) (Jeandet).
Ortega, "Role of natural stilbenes
in the prevention of cancer," Oxidative Medicine and Cellular Longevity, vol.
Yoshikawa, "Antioxidant constituents from rhubarb: structural requirements of stilbenes
for the activity and structures of two new anthraquinone glucosides," Bioorganic and Medicinal Chemistry, vol.
Baek, "Production of a major stilbene
phytoalexin, resveratrol in peanut (Arachis hypogaea) and peanut products: a mini review," Reviews in Environmental Science and Bio/Technology, vol.
Bolling, "Characterisation of stilbenes
in California almonds (Prunus dulcis) by UHPLC-MS," Food Chemistry, vol.
Compounds 5 and 6 had stilbene
structures and showed potent inhibitory activity, with [IC.sub.50] values of 6.73 [micro]M and 11.05 [micro]M as compared to the positive control, Trolox, with an [IC.sub.50] value of 16.83 [micro]M.
For example, the 1H-NMR spectrum of 2i exhibits one singlet for the same two olefin protons in 6.5 ppm that is in agreement with (Z)-structure for stilbene
. Aromatic protons appeared in the region between 7.3-7.7 ppm with expected pattern for mono substituted benzene.
Pterostilbene and resveratrol are both stilbene
compounds and are structurally related.
Solution-Grown Crystals for High-Energy Neutron Detection made of stilbene
constitute the best known scintillator material capable of definitively distinguishing neutrons from gamma rays.
The major peak-to-peak mass increments were 133, 227, 297, 315 to 319, 429, and 445 Da, which corresponded to structures (I) resorcinol, (II) stilbene
type, (III) fisetinidin, (IV) catechin, (V) fisetinidin-resorcinol, and (VI) catechin-resorcinol repeating units, respectively (Table 1).
Application of high-speed counter-current chromatography combined with macroporous resin for rapid enrichment and separation of three anthraquinone glycosides and one stilbene
glycoside from Rheum tanguticum.