Urushiol

Urushiol ( /ʊˈruːʃi.ɒl/) is an oily organic allergen found in plants of the family Anacardiaceae, especially Toxicodendron spp. (e.g., poison oak, poison ivy, poison sumac). It causes an allergic skin rash on contact, known as urushiol-induced contact dermatitis. The name comes from the Japanese word for the tree Toxicodendron vernicifluum (漆, urushi?). The oxidation and polymerization of urushiol in the tree's sap in the presence of moisture allows it to form a hard lacquer, which is used to produce traditional Chinese, Korean and Japanese lacquerware.

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Other articles related to "urushiol":

Toxicodendron Diversilobum - Habitat
... The plant toxin produced by members of the genus Toxicodendron, called urushiol, is known for causing an uncomfortable, and sometimes painful, skin reaction ... Urushiol is the main component of the oily resin that is found on the stems and leaves of poison ivy and several other related species ... The active components of urushiol have been determined by Billets (1975) to be unsaturated congeners of 3-heptadecylcatechol with up to three double bonds in an unbranched C17 side chain ...
Urushiol - Characteristics
... Urushiol is a pale-yellow liquid with density of 0.968 and a boiling point of 200 °C (392 °F) ... Urushiol is a mixture of several closely related organic compounds ... Whereas western poison oak urushiol contains chiefly catechols with C17 side-chains, poison ivy and poison sumac contain mostly catechols with C15 side-chains ...
Urushiol-induced Contact Dermatitis - Exposure
... Urushiol-induced contact dermatitis is contracted by contact with a plant or any other object containing urushiol oil ... Urushiol is primarily found in the spaces between plant cells beneath the outer skin of the plant, so the effects of urushiol rash are less severe if the plant tissue ... Urushiol does not always spread once it has bonded with the skin, and cannot be transferred once the urushiol has been washed away ...
Toxicodendron Vernicifluum - Uses
... A caustic, toxic sap, called urushiol, is tapped from the trunk of the Chinese lacquer tree to produce lacquer ... chamber or closet for 12 to 24 hours where the urushiol polymerizes to form a clear, hard, and waterproof surface ... In its liquid state, urushiol can cause extreme rashes, even from vapours ...
Urushiol-induced Contact Dermatitis - Rash
... People vary greatly in their sensitivity to urushiol ... In approximately 15% to 30% of people, urushiol does not initiate an immune system response, while at least 25% of people have very strong immune responses resulting in severe symptoms ... to 90% of adults will get a rash if they are exposed to 50 micrograms of purified urushiol ...