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Pittosporum undulatum Vent. grown in Portugal: secretory structures, seasonal variation and enantiomeric composition of its essential oil
Author(s) -
Ferreira Nicolau J.,
Meireles de Sousa Inês G.,
Luís Tiago Cunha,
Currais António José M.,
Figueiredo Ana Cristina,
Costa Monya M.,
Lima A. Sofia B.,
Santos Pedro A. G.,
Barroso José G.,
Pedro Luis G.,
Scheffer Johannes J. C.
Publication year - 2006
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/ffj.1748
Subject(s) - sabinene , chemistry , limonene , essential oil , botany , trichome , benzyl benzoate , horticulture , composition (language) , chromatography , organic chemistry , biology , linguistics , philosophy
Aerial parts of Pittosporum undulatum were collected fortnightly for 1 year at the Parque de Saúde de Lisboa. Collective samples of two populations were investigated, i.e. from pruned and non‐pruned trees, and in addition samples from one pruned and one non‐pruned individual. An SEM study of the aerial parts showed the presence of non‐glandular T‐shaped trichomes, and capitate trichomes with an elongated stalk and two to four round‐shaped cells on the top. Numerous canals were seen at the level of the capsule wall as well as in the leaves and stems. Essential oil samples were isolated from the (deep‐frozen) aerial parts by hydrodistillation to estimate the oil yields, and by distillation–extraction to determine their percentage composition, and analysed by GC and GC–MS. Monoterpenes (59–97%) were dominant in all oils, sabinene (5–58%), limonene (2–37%) and terpinen‐4‐ol (4–27%) being the major components, although in different relative amounts during the year of collection. Benzyl benzoate (8%) and benzyl salicylate (10%) attained high relative amounts in the oils from fully developed flowers, whereas in the oils from the other plant parts their relative amounts did not exceed 1%. The enantiomeric ratio of sabinene, limonene and terpinen‐4‐ol was investigated in the leaf, flower and capsule oils, showing dominance of the (+)‐forms and homogeneity between all the oil samples. Copyright © 2006 John Wiley & Sons, Ltd.