Essential oil from leaves of Cryptocarya mandioccana Meisner (Lauraceae): Composition and intraspecific chemical variability

Essential oils from leaves of cryptocarya spp from the atlantic rain forest

“…The main constituents of C. mandioccana oil were sesquiterpenes (β-caryophyllene, spathulenol, caryophyllene oxide, δ-cadinene, bicyclogermacrene and germacrene D), whilst those of the oil of C. moschata were acyclic and menthane type monoterpenes (linalool and α-terpinene) as previously reported for these species. 4,7 The main constituents of the essential oil of C. botelhensis were the pinane monoterpenes, whilst sesquiterpenes were predominant in the essential oil of C. saligna.…”

“…7,13,14 The occurrence of distinct sesquiterpene synthases, each associated with a different mode of cyclisation of FPP, is not yet conclusive and it has been suggested that a certain degree of freedom in the process of ring closure might be responsible for the formation of multiple end-products. 15 However, the essential oil from C. saligna exhibited a significant predominance of sesquiterpenes deriving from C1-C10 cyclisation and this may be indicative of the occurrence of a specific sesquiterpene synthase within this species.…”

“…6 Analysis of essential oils obtained by hydrodistillation of leaves of C. mandioccana, including intraspecific variants, yielded 64 compounds with predominance of β-caryophyllene, spathulenol, caryophyllene oxide, δ-cadinene, germacrene D, benzaldehyde and bicyclogermacrene. 7 Sampling the essential oil from leaves of C. moschata Nees (current status C. mandioccana Meisner) at different times and seasons revealed no significant variation in oil composition. 8 In the present study, we have compared the chemical constitutions of the essential oil from leaves of C. mandioccana, C. moschata and C. saligna, the three most common Cryptocarya …”

Seasonal influence on the essential oil production of Nectandra megapotamica (Spreng.) Mez

“…However, there is a predominance of the synthesis of germacrene D also in the northern growing population. According to Telascrea et al (2007), this is due to the pressure of environmental and/or ecological selection, characterizing a chemical adjustment to the prevailing environmental conditions.…”

Recent advances on supercritical fluid extraction of essential oils

“…The steam distillation is a traditional technique for essential oils (Demorais et al, 2007;Smelcerovic et al, 2007;Telascrea et al, 2007;Di Leo Lira et al, 2009;Jeong et al, 2009). This is a very simple process, but suffers of many drawbacks: Thermal degradation, hydrolysis and solubilization in water of some compounds that alter the flavour and fragrance profile of many essential oils extracted by this technique.…”