Biology:Toxicodendron vernicifluum
| Toxicodendron vernicifluum | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Sapindales |
| Family: | Anacardiaceae |
| Genus: | Toxicodendron |
| Species: | T. vernicifluum
|
| Binomial name | |
| Toxicodendron vernicifluum (Stokes) F. A. Barkley
| |
Toxicodendron vernicifluum (formerly Rhus verniciflua[1]), also known by the common name Chinese lacquer tree,[1][2][3] is an Asian tree species of genus Toxicodendron native to China and the Indian subcontinent, and cultivated in regions of China, Japan and Korea.[4] Other common names include Japanese lacquer tree,[5] Japanese sumac,[4] and varnish tree.[5] The trees are cultivated and tapped for their toxic sap, which is used as a highly durable lacquer to make Chinese, Japanese, and Korean lacquerware.
The trees grow up to 20 metres tall with large leaves, each containing from 7 to 19 leaflets (most often 11–13). The sap contains the allergenic compound urushiol, which gets its name from this species' Japanese name urushi (urushi (漆)); "urushi" is also used in English as a collective term for all kinds of Asian lacquerware made from the sap of this and related Asian tree species, as opposed to European "lacquer" or Japanning made from other materials. Urushiol is also the oil found in poison ivy and poison oak that causes a rash.
Uses
Lacquer
Sap, containing urushiol (an allergenic irritant), is tapped from the trunk of the Chinese lacquer tree to produce lacquer. This is done by cutting 5 to 10 horizontal lines on the trunk of a 10-year-old tree, and then collecting the greyish yellow sap that exudes. The sap is then filtered, heat-treated, or coloured before applying onto a base material that is to be lacquered. Curing the applied sap requires "drying" it in a warm, humid 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. Once hardened, reactions are possible but less common.[citation needed]
Products coated with lacquer are recognizable by an extremely durable and glossy finish. Lacquer has many uses; some common applications include tableware, musical instruments, fountain pens,[6] jewelry, and bows for archery. There are various types of lacquerware. The cinnabar-red is highly regarded. Unpigmented lacquer is dark brown but the most common colors of urushiol finishes are black and red, from powdered iron oxide pigments of ferrous-ferric oxide (magnetite) and ferric oxide (rust), respectively. Lacquer is painted on with a brush and is cured in a warm and humid environment.[citation needed]
The leaves, seeds, and the resin of the Chinese lacquer tree are sometimes used in Chinese medicine for the treatment of internal parasites and for stopping bleeding. Compounds butein and sulfuretin are antioxidants, and have inhibitory effects on aldose reductase and advanced glycation processes.[7]
Buddhist monks who practiced the art of Sokushinbutsu would use the tree's sap in their ceremony.[citation needed]
Wax
The fruits of T. vernicifluum can also be processed to produce a waxy substance known as Japan wax used for numerous purposes including varnishing furniture and producing candles.[8][9] The fruits of the trees are harvested, dried, steamed, and pressed to extract the wax, which hardens when cooled.[10]
See also
References
- ↑ 1.0 1.1 "PLANTS Profile for Toxicodendron vernicifluum (Chinese lacquer)". Natural Resources Conservation Service. United States Department of Agriculture. http://plants.usda.gov/java/profile?symbol=TOVE3. Retrieved 8 August 2011.
- ↑ Yun-Yang, W.; Yu-Min, D.; Fang-Xing, Y.; Ying, X.; Rong-Zhi, C.; Kennedy, J. F. (2006). "Purification and characterization of hydrosoluble components from the sap of Chinese lacquer tree Rhus vernicifera". International Journal of Biological Macromolecules 38 (3–5): 232–40. doi:10.1016/j.ijbiomac.2006.02.019. PMID 16580725. http://ir.ihb.ac.cn/handle/152342/8940.
- ↑ Mabberley, D. J. (2002). The plant-book: A portable dictionary of the vascular plants (2nd ed.). Cambridge, U.K.: Cambridge University Press. p. 286. ISBN 978-0-521-41421-0. https://books.google.com/books?id=ZVdoUPtqKCIC.
- ↑ 4.0 4.1 {{citation | mode = cs1 | title = Toxicodendron vernicifluum | work = Germplasm Resources Information Network (GRIN) | url = https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?101869 | publisher = [[Organization:Agricultural Research ServAgricultural Research Service (ARS), United States Department of Agriculture (USDA) | access-date = 10 December 2013 }}
- ↑ 5.0 5.1 "Common Names for Chinese Lacquer (Toxicodendron vernicifluum)". http://eol.org/pages/483494/names/common_names. Retrieved 10 December 2013.
- ↑ Fountain Pens made with Urushi lacquer
- ↑ Lee, E. H.; Song, D. G.; Lee, J. Y.; Pan, C. H.; Um, B. H.; Jung, S. H. (August 2008). "Inhibitory effect of the compounds isolated from Rhus verniciflua on aldose reductase and advanced glycation endproducts". Biological and Pharmaceutical Bulletin 31 (8): 1626–30. doi:10.1248/bpb.31.1626. PMID 18670102.
- ↑ "国家标准计划 - 全国标准信息公共服务平台". http://std.samr.gov.cn/gb/search/gbDetailed?id=5DDA8B9DBCBC18DEE05397BE0A0A95A7.
- ↑ "惡魔植物---野生漆樹，一碰就會過敏水腫" (in zh-tw). https://kknews.cc/agriculture/nlpqyg.html.
- ↑ 長崎新聞 (2018-10-28). "伝統産業 木蝋 こだわりの製法貫く ｜ 長崎新聞" (in ja). https://this.kiji.is/429096550203950177.
Further reading
- Duke, James A.; Ayensu, Edward S. Medicinal Plants of China. Algonac, Mich.: Reference Publications, Inc. 1985. ISBN:0-917256-20-4.
- Matsuda, Gonroku (2019). The Book of Urushi. Japan Publishing Industry Foundation for Culture. ISBN 9784866580609. https://www.jpicinternational.com/books/artanddesign/cd6bbfc134c6d634ba7027d7fd11c85c0513de1d.html.
- Kim, Ki Hyun; Moon, Eunjung; Choi, Sang Un; Pang, Changhyun; Kim, Sun Yeou; Lee, Kang Ro (13 March 2015). "Identification of cytotoxic and anti-inflammatory constituents from the bark of Toxicodendron vernicifluum (Stokes) F.A. Barkley". Journal of Ethnopharmacology 162: 231–237. doi:10.1016/j.jep.2014.12.071. PMID 25582488.
- Stutler, Russ. "A Little more information on Urushi". December 2002.
- Suganuma, Michiko. "Japanese lacquer".
External links
- Toxicodendron vernicifluum in the Flora of China
- Heat treatment of Japanese lacquerware renders it hypoallergenic
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