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Rheum palmatum L. - Polygonaceae
掌叶大黄 zhang ye da huang (chin.), Chinese rhubarb, Turkish rhubarb, Handlappiger Rhabarber, Russischer Rhabarber, Tangutischer Rhabarber
Large perennial herb, 1.5-2 m tall, native to Northeast Tibet, Northwest China, cultivated in Europe; stem hollow; leaves large, as long as wide, palmately lobed; flowers small, purple-red, rarely yellow-white.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200006744
„The composition of the volatile oil from the rhizomes of Rheum palmatum L. has been investigated by capillary GC, GC-MS and 1H-NMR. The oil contained 108 volatile components of which 27.3% were terpenoid. The main constituents were palmitic acid (22.5%), paeonol (16.2%), α-copaene (9.8%), methyl stearate (9.3%), δ-cadinene (5.7%) and methyl eugenol (5.4%).“
[Volatile components of the Rhizomes of Rheum palmatum L. Miyazawa, M., Minamino, Y., Kameoka, H., Flavour and fragrance journal, Vol.11(1), 1996, 57-60]
„The ultrasonic nebulization extraction (UNE) was developed and applied to extract anthraquinones (emodin, aloe-emodin and rhein) from Rheum palmatum L. … Under the selected conditions, contents of emodin, aloe-emodin and rhein obtained from different cultivated areas of R. palmatum L. were 1.08–2.04 mg/g, 0.65–1.16 mg/g and 0.70–2.90 mg/g, respectively. The relative standard deviations (RSDs) for emodin, aloe-emodin and rhein were 1.3–2.4%, 1.9–4.7% and 1.3–3.9%, respectively. Compared with maceration extraction (ME), reflux extraction (RE), stirring extraction (SE) and ultrasonic extraction (UE), the proposed method was more efficient, faster and easier to be operated and lower equipment costs and lower extraction temperature were required. The results indicated that UNE was a good alternative method for extracting anthraquinones from R. palmatum L. “
[Ultrasonic extraction and separation of anthraquinones from Rheum palmatum L., Wang, L., Li, D., Bao, C., You, J., Wang, Z., Shi, Y., Zhang, H., Ultrasonics sonochemistry, Vol.15(5), 2008, 738-746]
