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KMID : 0861020200350020001
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Korea Journal of Herbology
2020 Volume.35 No. 2 p.1 ~ p.6
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Chemical change of urushiol during heating process ofToxicodendron vernicifluum resin
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Kim Jung-Hoon
Do Eui-Jeong
Lee Guem-San
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Abstract
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Objectives : Heating process is the traditional processing method that has been applied to reduce the toxicity of dried resin of Toxicodendron vernicifluum (Anacardiacea) used as Geon-chil (乾漆, Lacca Rhois Exsiccata or Toxicodendri Resina). Urushiol, which is found in the plants of Toxicodendron genus, is a toxic compound that is absorbed into the skin and induces allergic dermatitis by being contacted. Hence, the reduction of urushiol level by heating processing of Geon-chil is crucial method for its medicinal application.
Methods : Due to lack of Geon-chil processing-related articles, the articles researching the processing of lacquer (漆), as a coating material, were collected and analyzed to investigate the chemical change of urushiol during heating process.
Results : The results demonstrate that the resin which was collected from the sap of T. vernicifluum tree was dried under warm and humid conditions repeatedly. During primary drying process, the laccase, a copper-containing enzyme in the resin, participated in the formation of urushiol polymers and thereafter urushiol-related toxicity could be reduced by making a lacquer harder and more stable. Moreover, heating a lacquer over 200℃ could cause thermo- degradation of urushiol polymers, and vaporized thermally degraded urushiol monomers and their by-products, which were determined using pyrolysis/GC-MS.
Conclusions : These results support that heating process being performed over 200 ℃, such as stir-frying (炒) or calcination (?), reduces the urushiol content in Geon-chil and hence, its medicinal use can be more stable without urushiol-related allergic reactions.
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KEYWORD
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Toxicodendron vernicifluum, Geon-chil (乾漆), Urushiol, Toxicodendri Resina, Lacca Rhois Exsiccata, Heating process
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