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Détail de l'auteur
Auteur Wudeneh Letchamo
Documents disponibles écrits par cet auteur
Affiner la rechercheChemical screening of essential oil bearing flora of Siberia II. / Wudeneh Letchamo in The journal of essential oil research, Vol. 17 N° 3 (Mai-Juin 2005)
in The journal of essential oil research > Vol. 17 N° 3 (Mai-Juin 2005) . - pp. 314-315
Titre : Chemical screening of essential oil bearing flora of Siberia II. : Composition of the essential oil of schizonepeta annua (Pallas) schischkin leaves from altai region Type de document : texte imprimé Auteurs : Wudeneh Letchamo, Auteur ; Elena A. Korolyuk, Auteur ; Alexey V. Tkachev, Auteur Année de publication : 2006 Article en page(s) : pp. 314-315 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Schizonepeta annua Lamiaceae Essential oil composition Thymol γ-terpinene Résumé : The chemical composition of the leaf oil of Schizonepeta annua (Pallas, Schischkin) from Altai Region, Siberia, which was obtained in 4.0% yield, was investigated by GC and GC/MS. The major components were thymol (48.1%), γ-tepinene (18.1%), carvacrol (9.6 %) and p-cymene (9.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698915#.UePAhmF2_n5 [article] Chemical screening of essential oil bearing flora of Siberia II. : Composition of the essential oil of schizonepeta annua (Pallas) schischkin leaves from altai region [texte imprimé] / Wudeneh Letchamo, Auteur ; Elena A. Korolyuk, Auteur ; Alexey V. Tkachev, Auteur . - 2006 . - pp. 314-315.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 17 N° 3 (Mai-Juin 2005) . - pp. 314-315
Mots-clés : Schizonepeta annua Lamiaceae Essential oil composition Thymol γ-terpinene Résumé : The chemical composition of the leaf oil of Schizonepeta annua (Pallas, Schischkin) from Altai Region, Siberia, which was obtained in 4.0% yield, was investigated by GC and GC/MS. The major components were thymol (48.1%), γ-tepinene (18.1%), carvacrol (9.6 %) and p-cymene (9.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698915#.UePAhmF2_n5
in The journal of essential oil research > Vol. 17 N° 4 (Juillet-Août 2005) . - pp. 396-397
Titre : Chemical screening of essential oil bearing flora of Siberia III. : Composition of the essential oil of sium latifolium L. tops from altai region Type de document : texte imprimé Auteurs : Wudeneh Letchamo, Auteur ; Elena A. Korolyuk, Auteur ; Alexey V. Tkachev, Auteur Année de publication : 2006 Article en page(s) : pp. 396-397 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Sium latifolium Apiaceae (Umbelliferae) Essential oil composition α-pinene Sabinene Limonene Pesticide Antifungal Algaecide Analgesic Résumé : Distillation of the flowering tops of Sium latifolium L, from Altai Region for 3 h yielded 0.05%, mobile colorless oil reminiscent of angelica root oil. By analyzing the oil samples using GC and GC/MS, we found that the major components were limonene (32.4%), sabinene (21.7%), α-pinene (12.7%) and γ-terpinene (10.2%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698940#.Ucf_CWF2_n7 [article] Chemical screening of essential oil bearing flora of Siberia III. : Composition of the essential oil of sium latifolium L. tops from altai region [texte imprimé] / Wudeneh Letchamo, Auteur ; Elena A. Korolyuk, Auteur ; Alexey V. Tkachev, Auteur . - 2006 . - pp. 396-397.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 17 N° 4 (Juillet-Août 2005) . - pp. 396-397
Mots-clés : Sium latifolium Apiaceae (Umbelliferae) Essential oil composition α-pinene Sabinene Limonene Pesticide Antifungal Algaecide Analgesic Résumé : Distillation of the flowering tops of Sium latifolium L, from Altai Region for 3 h yielded 0.05%, mobile colorless oil reminiscent of angelica root oil. By analyzing the oil samples using GC and GC/MS, we found that the major components were limonene (32.4%), sabinene (21.7%), α-pinene (12.7%) and γ-terpinene (10.2%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9698940#.Ucf_CWF2_n7
in The journal of essential oil research > Vol. 17 N° 6 (Novembre-Décembre 2005) . - pp. 636-637
Titre : Chemical screening of essential oil bearing flora of siberia. VII. : Composition of the essential oil of kadenia dubia (Schkuhr) lavrova et V.N. tichom. from Altai region Type de document : texte imprimé Auteurs : Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur Année de publication : 2006 Article en page(s) : pp. 636-637 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Kadenia dubia Apiaceae (Umbelliferae) Essential oil composition α-pinene (E)-β-ocimene β-phellandrene Résumé : Distillation of the flowering tops of Kadenia dubia (Schkuhr) Lavrova et V.N.Tichom., from Altai Region for 3 h yielded 0.03% aromatic, mobile light yellowish-green oil. By analyzing the oil samples using GC and GC/MS, we found that the major components were α-pinene (24.5%), (E)-β-ocimene (16.1%), limonene + β-phellandrene (10.9%), (Z)-ocimene (6.6%), myrcene (5.0%) and β-selinene (5.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9699019#.Ub26kdh-Rkg [article] Chemical screening of essential oil bearing flora of siberia. VII. : Composition of the essential oil of kadenia dubia (Schkuhr) lavrova et V.N. tichom. from Altai region [texte imprimé] / Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur . - 2006 . - pp. 636-637.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 17 N° 6 (Novembre-Décembre 2005) . - pp. 636-637
Mots-clés : Kadenia dubia Apiaceae (Umbelliferae) Essential oil composition α-pinene (E)-β-ocimene β-phellandrene Résumé : Distillation of the flowering tops of Kadenia dubia (Schkuhr) Lavrova et V.N.Tichom., from Altai Region for 3 h yielded 0.03% aromatic, mobile light yellowish-green oil. By analyzing the oil samples using GC and GC/MS, we found that the major components were α-pinene (24.5%), (E)-β-ocimene (16.1%), limonene + β-phellandrene (10.9%), (Z)-ocimene (6.6%), myrcene (5.0%) and β-selinene (5.0%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2005.9699019#.Ub26kdh-Rkg
in The journal of essential oil research > Vol. 18 N° 2 (Mars-Avril 2006) . - pp. 149-151
Titre : Chemical screening of volatile oil-bearing flora of siberia IX. variations in chemical composition of the essential oil of heteropappus altaicus willd. (Novopokr.) growing wild at different altitudes of altai region, Russia Type de document : texte imprimé Auteurs : Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur Année de publication : 2006 Article en page(s) : pp. 149-151 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Heteropappus altaicus Asteraceae Essential oil composition α-pinene β-phellandrene Myrcene (E)-β-ocimene Germacrene D Résumé : Distillation of the fresh flowering tops of Heteropappus altaicus Willd. (Novopokr.) collected from four different altitudes of Altai Region of Siberia yielded mobile, dark green to yellowish oils, depending on the altitude and location of collection. GC and GC/MS analyses of the oils revealed 42 components, of which 65–91% were monoterpenoids and 7–31% were sesquiterpenoid. The oil obtained from 330 m had α-pinene (18.6%), myrcene (18.6%), β-phellandrene (17.2%), (E)-β-ocimene (12.9%) and germacrene D (11.9%), while samples from 600 m consisted of myrcene (26.4%), α-pinene (23.2%), β-phellandrene (18.0%), (E)-β-ocimene (9.9%), germacrene D (4.3%) and sabinene (4.2%). The oil from 120 m had -pinene (22.0%), β-phellandrene (21.6%), myrcene (19.5%), trans-β-ocimene (11.3%), germacrene D (7.2%) and limonene (4.5%) as major components. At 1550 m the major components were germacrene D (22.0%), myrcene (18.0%), β-phellandrene (14.0%), α-pinene (11.3%) and (E)-β-ocimene (9.2%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699048#.UatLHtgYrOk [article] Chemical screening of volatile oil-bearing flora of siberia IX. variations in chemical composition of the essential oil of heteropappus altaicus willd. (Novopokr.) growing wild at different altitudes of altai region, Russia [texte imprimé] / Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur . - 2006 . - pp. 149-151.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 18 N° 2 (Mars-Avril 2006) . - pp. 149-151
Mots-clés : Heteropappus altaicus Asteraceae Essential oil composition α-pinene β-phellandrene Myrcene (E)-β-ocimene Germacrene D Résumé : Distillation of the fresh flowering tops of Heteropappus altaicus Willd. (Novopokr.) collected from four different altitudes of Altai Region of Siberia yielded mobile, dark green to yellowish oils, depending on the altitude and location of collection. GC and GC/MS analyses of the oils revealed 42 components, of which 65–91% were monoterpenoids and 7–31% were sesquiterpenoid. The oil obtained from 330 m had α-pinene (18.6%), myrcene (18.6%), β-phellandrene (17.2%), (E)-β-ocimene (12.9%) and germacrene D (11.9%), while samples from 600 m consisted of myrcene (26.4%), α-pinene (23.2%), β-phellandrene (18.0%), (E)-β-ocimene (9.9%), germacrene D (4.3%) and sabinene (4.2%). The oil from 120 m had -pinene (22.0%), β-phellandrene (21.6%), myrcene (19.5%), trans-β-ocimene (11.3%), germacrene D (7.2%) and limonene (4.5%) as major components. At 1550 m the major components were germacrene D (22.0%), myrcene (18.0%), β-phellandrene (14.0%), α-pinene (11.3%) and (E)-β-ocimene (9.2%). ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699048#.UatLHtgYrOk
in The journal of essential oil research > Vol. 18 N° 1 (Janvier-Fevrier 2006) . - pp. 46-50
Titre : Volatile oil-bearing flora of siberia VIII : Essential oil composition and antimicrobial activity of wild solidago virgaurea L. from the russian altai Type de document : texte imprimé Auteurs : Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur Année de publication : 2006 Article en page(s) : pp. 46-50 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Solidago virgaurea Asteraceae Goldenrod Essential oil composition Antimicrobial activity α-pinene Myrcene Benzyl benzoate β-caryophyllene Chemotype Altitude A. nigra S. aureus D. aeruginosa Résumé : Distillation of the fresh flowering tops of wild-growing Solidago virgaurea L. collected from the Russian Altai at 290 m and 650 m yielded 0.22% and 0.07% pure light yellow oil, respectively. GC and GC/MS analyses of the oils revealed that the main components from 290 m were α-pinene (36.5%), myrcene (14.8%), β-caryophyllene (10.5%), germacrene D (8.2%), β-pinene (7.1%) and limonene+β-phellandrene (6.4%). The oil from the sample collected at 650 m had benzyl benzoate (57.0%), β-caryophyllene (6.3%), germacrene D (6.0%), α-pinene (4.4%) and α-humulene (4.0%) as major components, suggesting polymorphism or the existence of different chemoytpes. Using the disc diffusion method we tested the activity of the oil obtained from 290 m against five microbes of health and environmental importance. It showed complete inhibition or killed Aspergillus niger and Staphylococcus aureus, strong inhibition of Saccharomyces cervisiae, and low activity against Escherichia coli, but no effect on Pseudomonas aeruginosa. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699382#.Ua7uUtgYrOk [article] Volatile oil-bearing flora of siberia VIII : Essential oil composition and antimicrobial activity of wild solidago virgaurea L. from the russian altai [texte imprimé] / Alexey V. Tkachev, Auteur ; Elena A. Korolyuk, Auteur ; Wudeneh Letchamo, Auteur . - 2006 . - pp. 46-50.
Génie Chimique
Langues : Anglais (eng)
in The journal of essential oil research > Vol. 18 N° 1 (Janvier-Fevrier 2006) . - pp. 46-50
Mots-clés : Solidago virgaurea Asteraceae Goldenrod Essential oil composition Antimicrobial activity α-pinene Myrcene Benzyl benzoate β-caryophyllene Chemotype Altitude A. nigra S. aureus D. aeruginosa Résumé : Distillation of the fresh flowering tops of wild-growing Solidago virgaurea L. collected from the Russian Altai at 290 m and 650 m yielded 0.22% and 0.07% pure light yellow oil, respectively. GC and GC/MS analyses of the oils revealed that the main components from 290 m were α-pinene (36.5%), myrcene (14.8%), β-caryophyllene (10.5%), germacrene D (8.2%), β-pinene (7.1%) and limonene+β-phellandrene (6.4%). The oil from the sample collected at 650 m had benzyl benzoate (57.0%), β-caryophyllene (6.3%), germacrene D (6.0%), α-pinene (4.4%) and α-humulene (4.0%) as major components, suggesting polymorphism or the existence of different chemoytpes. Using the disc diffusion method we tested the activity of the oil obtained from 290 m against five microbes of health and environmental importance. It showed complete inhibition or killed Aspergillus niger and Staphylococcus aureus, strong inhibition of Saccharomyces cervisiae, and low activity against Escherichia coli, but no effect on Pseudomonas aeruginosa. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2006.9699382#.Ua7uUtgYrOk
