Hamamelis

Hamamelis [84696-19-5] Hamamelis virginiana Ham curing Hammerhead ribozyme Hammer mills Hammett equation Hamposyl 0 Hamposyl C Hamposyl C-30 Hamposyl L Hamposyl L-30 Hand factor Hand lay-up... 

NonalcohoHc steam distillate of parts of Hamamelis virginiana. 

The family Hamamelidaceae consists of 26 genera and about 100 species of shrubs or tress known to contain tannins and iridoids. The leaves are alternate, simple, and often palmately lobed. The flowers are small and appear in spikes. The fruits are woody, capsular, and scepticidal. In Western medicine, the dried leaves of Hamamelis virginiana (hamamelis, British Pharmaceutical Codex, 1963), yielding not less that 20% of alcohol (45%)-soluble extractive, have been used as astringents for the treatment of hemorrhoids. Hamamelis water (British Pharmaceutical Codex, 1969) made from the stems has been used as a cooling application to sprains and bruises and as a styptic remedy. It is also used in cosmetics and as active ingredient of eye lotions. 

Hydroxymethyl) -d -ribose (hama-melose) CH2OH H H HOH2 C—C—C—C—CHO HO HO HO tannins of Hamamelis virginiana<7 ... 

The carbon-chain structure of the sugar obtained from hamameli-tannin was established by the classical method of Kiliani,26 which is based on the reduction, with hydrogen iodide, of polyhydroxy acids to fatty acids. Treatment of the calcium salt of hamamelonic acid under these conditions led to inconclusive results. The reduction of the corresponding, crystalline ammonium salt, however, furnished 3.5 to 5% of 2-methylvaleric acid, which was identified by the properties of its crystalline p-iodophenacyl ester. Thus, it was proved that the sugar must have structure XIV. 

Acid hydrolysis of hamameli-tannin readily causes liberation of the carbohydrate component, 2-(hydroxymethyl)-D-ribose, together with two molar proportions of gallic acid, which presumably occupy similar positions, since there is no difference in their rate of cleavage. Methylation of hamameli-tannin with diazomethane, and subsequent alkaline hydrolysis,... 

Hamamelis Extract 250 mg Zinc oxide 400 mg Cocoa butter qs... 

A. Deters, A. Dauer, E. Schnetz, M. Fartasshc and A. Hensel, High molecular compounds (polysaccharides and proanthocyanidins) from Hamamelis virginiana bark influence on human skin keratinocyte proliferation and differentiation and influence on irritated skin. Phytochemistry 58 (2001) 949-958. 

Hartisch, C. and Kolodziej, FI., Galloylhamameloses and proanthocyanidins from Hamamelis... 

Dauer, A., Rimpler, H., and Hensel, A., Polymeric proanthocyanidins from the bark of Hamamelis virginiana, Planta Med, 69, 89, 2003. 

Duwiejua, M., Zeitlin, I.J., Waterman, P.G., and Gray, A.I., Anti-inflammatory activity of Polygonum bistorta, Guaiacum officinale, and Hamamelis virginiana in rats, /. Pharm. Pharmacol., 46, 286, 1994. 

This family is widespread but is found chiefly in the subtropics of southeast Asia. A few are North American, including the familiar witch hazel (Hamamelis). 

Witch hazel, Hamamelis, winterbloom, tobacco wood)... 

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