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Heat treatment of Japanese lacquerware renders it hypoallergenic
Author(s) -
Kawai Kehchi,
Nakagawa Mikio,
Kawai Kyozo,
Miyakoshi Tetsuo,
Miyashita Kenichi,
Asami Tohru
Publication year - 1992
Publication title -
contact dermatitis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 96
eISSN - 1600-0536
pISSN - 0105-1873
DOI - 10.1111/j.1600-0536.1992.tb03254.x
Subject(s) - lacquer , hypoallergenic , allergen , allergic contact dermatitis , contact urticaria , chemistry , contact dermatitis , food science , dermatology , medicine , allergy , organic chemistry , immunology , coating
Japanese lacquer is made from the sap of the Japanese lacquer tree (Toxicodendron Vernicifluum), a member of the Anacardiacae plant family. Objects painted with this material are described Collectively as lacquerware. Both fresh lacquer and lacquerware may evoke allergic contact reactions ascribable to the urushiols contained therein. In this study, we have examined the effects of heating on the ability of lacqueware to elicit an allergic contact reaction. Lacquer films prepared with and without heat treatment were tested on urushiol‐sensitive subjects. Patch test reactions were strongest to untreated film and decreased with increasing level of heat treatment. Assays for free urushiol in the lacquer films demonstrated that free urushiol content decreased with increasing heat treatment and that urushiols with saturated und monounsaturated alk(en)yl chains predominated.