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--- eugenia_uniflora_l [2014/12/04 11:15] – andreas
+++ eugenia_uniflora_l [2016/07/03 11:23] (aktuell) – andreas
@@ Zeile 21: / Zeile 21: @@
 "Extracts from pitanga leaves are considered to be effective against many diseases, and are therefore used in popular Brazilian medicines. In this study, the volatile constituents of pitanga fruits (Eugenia uniflora L.) were trapped on to Porapak-Q and eluted with ethyl acetate, and the chemical composition of the extract was analyzed by gas chromatography and gas chromatography/mass spectrometry. Fifty-four compounds were detected, and twenty-nine of those were identified by close matches with standard MS spectra. Monoterpenes (75.3% in mass) were found to comprise the largest class of the pitanga fruit volatiles, including trans-β-ocimene (36.2%), cis-ocimene (13.4%), the isomeric β-ocimene (15.4%) and β-pinene (10.3%). Several known therapeutic constituents of pitanga leaf extract, such as selina-1,3,7(11)-trien-8-one (the major constituent) were also found to be present in the fruit volatile extract, suggesting that the fruit may display therapeutic properties similar to those of the leaf extract." \\
 [Volatile compounds from pitanga fruit (//Eugenia uniflora// L.)., Oliveira, A. L., Lopes, R. B., Cabral, F. A., Eberlin, M. N., Food chemistry, 99(1), 2006, 1-5]
+| {{:furanoelemene.jpg| furanoelemene}} \\ furanoelemene \\ (curzerene)| {{:furanodiene.jpg|furanodiene }} \\ furanodiene || {{:germacrone.jpg| germacrone}} \\ germacrone \\ //(faint sweet-woody herbaceous)//| {{:elemene_beta.jpg|β-elemene }} \\ β-elemene |
 "The leaf essential oil of Eugenia uniflora L. (Myrtaceae) was extracted by Clevenger apparatus and analysed by gas chromatography-mass spectrometry (GC-MS). The leaves were collected and immediately extracted for five consecutive days at 9:00 am and 2:00 pm. No variance in the oil yields were observed in the period. Furanodiene and its rearrangement product, furanoelemene (or curzerene, 50.2%), β-elemene (5.9%) and α-cadinol (4.7%) were identified as the most abundant compounds. \\
-GC-O-AEDA pointed to nine active aroma compounds: β-elemene (5.9%, FD 256, fresh lemony and peppery), γ-elemene (3.5%, FD 4, green and oily), spathulenol (3.8%, FD 2, woody), globulol (3.1%, FD 2, woody), viridiflorol (1.7%, FD 2, woody), α-cadinol (4.7%, FD 4, woody), atractylone (1.8%, FD 2, green, floral), (E E)-germacrone (1.0%, FD 256, woody and perfume like note resembling pitanga’s leaf) and also furanodiene and furanoelemene (together 50.2%, FD 1024), the most intense aroma-active compound due to its higher flavor-dilution factor. The literature olfatory descriptions for furanodiene are spicy, woody, mushroom-like and for furanoelemene green, woody and geranium. In the present study, the co-elution of these compounds gave a spicy and woody aroma which resembles pitanga.\\
+GC-O-AEDA pointed to nine active aroma compounds: β-elemene (5.9%, FD 256, fresh lemony and peppery), γ-elemene (3.5%, FD 4, green and oily), spathulenol (3.8%, FD 2, woody), globulol (3.1%, FD 2, woody), viridiflorol (1.7%, FD 2, woody), α-cadinol (4.7%, FD 4, woody), atractylone (1.8%, FD 2, green, floral), (E,E)-germacrone (1.0%, FD 256, woody and perfume like note resembling pitanga’s leaf) and also furanodiene and furanoelemene (together 50.2%, FD 1024), the most intense aroma-active compound due to its higher flavor-dilution factor. The literature olfatory descriptions for furanodiene are spicy, woody, mushroom-like and for furanoelemene green, woody and geranium. In the present study, the co-elution of these compounds gave a spicy and woody aroma which resembles pitanga.\\
 The compound selina-1,3,7(11)-trien-8-one, pointed by Weyerstahl as one of the most important compound in the aroma of E. uniflora was not observed, even after co-injection of an authentic sample and single ion monitoring (SIM) GC-MS analyses. Equally, the compound oxidoselina-1,3,7(11)-trien-8-one was not detected in this leaf essential oil." \\
 [Identification of impact aroma compounds in Eugenia uniflora L.(Brazilian Pitanga) leaf essential oil., Melo, R. M., Corrêa, V. F., Amorim, A. C. L., Miranda, A. L. P., Rezende, C. M., Journal of the Brazilian Chemical Society, Vol.18(1), 2007, 179-183] \\
 [[http://www.scielo.br/scielo.php?pid=s0103-50532007000100020&script=sci_arttext]]
+{{:eugenia_uniflora.jpg?800}}\\
+Eugenia uniflora (flowers and young red leaves). Location: Midway Atoll
+[[https://creativecommons.org/licenses/by-sa/3.0/de/|CC BY-SA 3.0]], Author: Forest & Kim Starr   [[https://en.wikipedia.org/wiki/Eugenia_uniflora#/media/File:Starr_080610-8163_Eugenia_uniflora.jpg|Wikimedia Commons]]