Engelhardia roxburghiana Wall leaf tea

Product Description

Engelhardtia Leaf P.E. (Engelhardia roxburghiana Wall leaf )
Astilbin (3-0-alpha-1-rhamnosyl-(2R,3R)-dihydroquercetin)was in 1950 by Kozo Hayashi and Kazuhiko Ouchi bride down the first time from plant compounds have been extracted , it has been reported in the literature, charged with a variety of glycosides bride significant biological activity, including inhibiting coenzyme A reductase, aldose reductase inhibitor to protect the liver, analgesic, anti-edema. It is reported that in recent years came down bride glycosides have significant selective immunosuppressive effects, and its selective role in the past compared to immunosuppressive agents has obvious advantage, therefore can be used as a new immunosuppressive agent for immune-related disease treatment.
Astilbin (3-0-alpha-1-rhamnosyl-(2R,3R)-dihydroquercetin), the major constituent isolated from Hymeneae martiana and some derivatives obtained by structural modification, such as taxifolin and two related compounds, were evaluated as analgesics by using both writhing test and formalin test in mice. Their anti-oedematogenic actions were also analysed against paw oedema caused by carrageenan, dextran and bradykinin in rat. The results indicated that some compounds, such as taxifolin (2) and its tetramethylated derivative (4) exhibited potent and dose-dependent antinociceptive action against acetic acid-induced abdominal constriction when administered intraperitoneally or orally. They were more potent than acetylsalicylic acid and paracetamol(acetaminophen), two standard drugs used for comparison. Compounds 2 and 4 were also more potent than these drugs in attenuating to the second phase of the formalin-induced licking. Moreover, both compounds showed significant anti-oedematogenic effect, inhibiting the paw oedema formation induced by dextran. In contrast pentaacetylated taxifolin (3) was capable of inhibiting the paw oedema induced by bradykinin.