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Essential oil from leaves of Cryptocarya mandioccana Meisner (Lauraceae): Composition and intraspecific chemical variability
Authors:Marcelo Telascrea,Carla C. de Araú  jo,Má  rcia O.M. Marques,Roselaine Facanali,Pedro L.R. de Moraes,Alberto J. Cavalheiro
Affiliation:1. NuBBE – Núcleo de Bioensaios, Biossíntese e Ecofisiologia de Produtos Naturais, Departamento de Química Orgânica, Instituto de Química, UNESP, CEP 14800-900, Araraquara, SP, Brazil;2. Centro de Genética, Biologia Molecular e Fitoquímica, Instituto Agronômico de Campinas, CEP 13020-902, Campinas, SP, Brazil;3. Instituto de Biologia, Depto de Botânica, UNICAMP, CEP 13083-970, Campinas, SP, Brazil
Abstract:The composition of the essential oil from leaves of Cryptocarya mandioccana has been determined by chromatographic fractionation and GC–FID, GC–MS and 13C NMR analyses, yielding the identification of 64 compounds with predominance of isomeric sesquiterpenes with molecular weights of 204. The main components of the oil obtained by hydrodistillation were β-caryophyllene, spathulenol, caryophyllene oxide, δ-cadinene, germacrene D, benzaldehyde and bicyclogermacrene. However, the oil obtained by steam distillation contained higher levels of sesquiterpene hydrocarbons, with predominance of β-caryophyllene (C), germacrene D (G) and bicyclogermacrene (B), and was considered to be more representative of the composition of the oil in its natural state. The intraspecific chemical variability of the essential oil obtained by steam distillation was evaluated within populations of trees growing at three separate locations in the state of São Paulo, Brazil. Three distinct chemical groups could be characterised due to differences in the relative percentages of the three main sesquiterpenes from essential oil: CGB [relative contents of C (14–34%), G (5–28%), B (8–15%)], BCG [B (17–34%), C (9–24%), G (12–25%)] and GCB [G (22–42%), C (4–17%), B (7–15%)]. Individuals from groups CGB and BCG were found to be more frequent at south locations while group GCB is predominant in north location.
Keywords:Cryptocarya mandioccana   Lauraceae   Essential oil   Monoterpenes   Sesquiterpenes   Retention index   Intraspecific variability
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