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--- quercus_robur_l [2016/05/19 20:26] – angelegt andreas
+++ quercus_robur_l [2023/08/04 07:12] (aktuell) – andreas
@@ Zeile 1: / Zeile 1: @@
 Quercus robur L. - syn. Quercus pedunculata Ehrh. - Fagaceae \\
-common oak, English oak, pedunculate oak, **Stieleiche**, Sommereiche
+common oak, English oak, pedunculate oak, **Stieleiche**, Sommereiche, Deutsche Eiche
-Deciduous monoecious tree, up to 40m high, native to Europe, West Asia; flower with very short pedicel.
+Deciduous monoecious tree, up to 50m tall, native to Europe, West Asia; leaves obovate, margin with 5-7 rounded or retuse lobes on each side; male inflorescences pendulous, 2-4cm long, flowers yellowish green; female inflorescences axillary on apical part of young shoot, 0.5-2cm; characteristic fruits - acorns, solitary or 2-5 on the same stalk, ovoid to ovoid-ellipsoid, up to 2.5cm long.
+Polyphenol content of Q.robur was found: outer bark 2.6%, inner bark 8.6% (d.w.). \\
+[Polyphenols of Quercus robur: adult tree and in vitro grown calli and shoots., Scalbert, A., Monties, B., Favre, J.M., Phytochemistry, 27(11), 1988, 3483-3488]
+The bark from young branches and trunks of young trees (of Q.petraeus and Q.robur) is harvested in spring and used to treat acute diarrhoea, stomach cramps, and inflammations of the skin or mucosa. The dried bark (oak bark, Quercus cortex, Cortex Quercus, Eichenrinde) contains tannins (up to 20%), mainly ellagitannins, catechins and oligomeric proanthocyanidins. The antimicrobial, antiviral, anthelminthic, anti-inflammatory and haemostyptic properties of oak decoctions are attributed to the protein-denaturing capabilities of tannin. \\
+ [Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004, 265]
+Traditional use include symptomatic treatment of diarrhoea, inflammation of skin and mucosa to relief itching and burning (mouth, throat, anal and genital region). \\
+[Wolfgang Blaschek ed., Wichtl - Teedrogen und Phytopharmaka: Ein Handbuch für die Praxis, 2015, 535-537]
+|{{:eugenol.jpg| eugenol}} \\ eugenol |{{:vanillin.jpg| vanillin}} \\ vanillin |{{oaklactone.png| oak lactone}} \\ [[http://www.leffingwell.com/chirality/whiskeylactone.htm|oak lactone]] \\ (whiskey lactone)|
+The odorous constituents of nine natural oak samples from Germany, Austria and Hungary were elucidated and the odor profiles were compared. "Several different odorants including 2-propenoic acid and cinnamaldehyde are reported here for the first time in oaks from different growth regions. Odor activity values (OAVs), calculated based on odor thresholds (OTs) in water, revealed hexanal, (E)-2-nonenal, (Z)-3-hexenal, eugenol, vanillin, and whiskey lactone as potent odorants for the oak odor." \\
+[Ghadiriasli, Rahil, et al. "Chemo-sensory characterization of aroma active compounds of native oak wood in relation to their geographical origins." Food Research International (2021): 110776]
+{{:quercus_pedunculata.jpg?600}} \\
+Quercus robur L. as Quercus pedunculata Ehrh. \\
+Kohl,F.G., Die officinellen Pflanzen der Pharmacopoea Germanica, t.26 (1891-1895) \\
+[[http://plantgenera.org/species.php?id_species=861629]]
+{{http://www.botanische-spaziergaenge.at/Bilder/Konica_3/PICT1233.JPG}} \\
+Quercus robur\\ © Rolf Marschner (2006),
+[[http://botanische-spaziergaenge.at/viewtopic.php?f=404&t=1117| www.botanische-spaziergaenge.at]]