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Free and glycosidically bound volatiles in guava leaves (Psidium guajava L.) palmira ICA-I cultivar / Mady García in The journal of essential oil research, Vol. 21 N° 2+ supplément vol.20 (Mars/Avril 2009+ supplément 2008) 

Public ISBD [article]  in The journal of essential oil research > Vol. 21 N° 2+ supplément vol.20 (Mars/Avril 2009+ supplément 2008) . - pp. 131-134 Titre : Free and glycosidically bound volatiles in guava leaves (Psidium guajava L.) palmira ICA-I cultivar Type de document : texte imprimé Auteurs : Mady García, Auteur ; Clara E. Quijano, Auteur ; Jorge A. Pino, Auteur Article en page(s) : pp. 131-134 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Guava  leaves  Psidium  guajava  Myrtaceae  Glycosidically  bound  volatiles Index. décimale : 646 Résumé : Free and glycosidically bound volatiles obtained from the guava leaves (Psidium guajava L.) by liquid-liquid extraction and by chromatography, followed by enzymatic hydrolysis with non-selective pectinase respectively, were analyzed by capillary GC and GC/MS analyses. A total of 39 free volatiles were detected (total amount of 1328 mg/ kg), with the major components being α-copaene, β-caryophyllene, and cadina-1,4-diene. Among the 47 detected glycosidically bound compounds (total amount of 7050 mg/kg), hexanol, benzyl alcohol, and (E)-3-hexenoic acid were found to be the major constituents. In aroma evaluation, the free volatile fraction showed a guava leaf-like aroma whereas the bound fraction was odorless. However, the characteristic herbaceous-green-fatty aroma was noted in the bound fraction after enzymatic hydrolysis. Upon the combination of the free and hydrolyzed bound fractions, a strongly fresh, guava leaf-like aroma was perceived. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top [article] Free and glycosidically bound volatiles in guava leaves (Psidium guajava L.) palmira ICA-I cultivar [texte imprimé] / Mady García, Auteur ; Clara E. Quijano, Auteur ; Jorge A. Pino, Auteur . - pp. 131-134. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 21 N° 2+ supplément vol.20 (Mars/Avril 2009+ supplément 2008) . - pp. 131-134 Mots-clés : Guava  leaves  Psidium  guajava  Myrtaceae  Glycosidically  bound  volatiles Index. décimale : 646 Résumé : Free and glycosidically bound volatiles obtained from the guava leaves (Psidium guajava L.) by liquid-liquid extraction and by chromatography, followed by enzymatic hydrolysis with non-selective pectinase respectively, were analyzed by capillary GC and GC/MS analyses. A total of 39 free volatiles were detected (total amount of 1328 mg/ kg), with the major components being α-copaene, β-caryophyllene, and cadina-1,4-diene. Among the 47 detected glycosidically bound compounds (total amount of 7050 mg/kg), hexanol, benzyl alcohol, and (E)-3-hexenoic acid were found to be the major constituents. In aroma evaluation, the free volatile fraction showed a guava leaf-like aroma whereas the bound fraction was odorless. However, the characteristic herbaceous-green-fatty aroma was noted in the bound fraction after enzymatic hydrolysis. Upon the combination of the free and hydrolyzed bound fractions, a strongly fresh, guava leaf-like aroma was perceived. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top