VARIABILITY IN THE COMPOSITION OF ESSENTIAL OILS OF ALOYSIA TRIPHYLLA

GALLUCCI, N., OLIVA, M., BELTRAMINO, E., ALVAREZ TOLEDO, A., GIL, A, ZYGADLO, J., DEMO, M.

Huerta Grande (Cba)

Otro; I Reunión Conjunta de Sociedades de Biología de la República Argentina; 2007

VARIABILITY IN THE COMPOSITION OF ESSENTIAL OILS OF ALOYSIA TRIPHYLLA Gallucci N, Oliva M, Beltramino E, Alvarez Toledo A, Gil A, Zygadlo J, Demo M. UNRC. Fac. Cs. Ex., Fc-Qcas. y Nat. Dpto. Microbiol. Inmunol. e-mail:moliva@exa.unrc.edu.ar Introduction: The essential oils (EOs) of A.triphylla showed differences in their terpenic composition. These differences determine chemotypes, which are defined by the content of neral, geranial, limonene, sabinene and transthujone. These reasons justify the study of the best conditions to cultivate this vegetable. Objetive: to study the chemical composition of the EOs of A.triphylla collected in different dates and places. Materials and methods: The EOs were obtained by hydrodistillation. The identification and cuantification of the EOs were performed by gaseous chromatography and mass spectrometry. Results and discussion: the average yields in EOs obtaining was 0,43% (w/v). The main terpenic components identified were limonene, neral, geranial, spathulenol and cariophyllene oxide. There were variations in amount of the common and minor components. There could be defined four chemotypes: I: Río 1º, II: Las Viñas, III: Salta, IV: La Paz, Paraguay, Mendoza, San Luis and Experimental Bs. As. The proportion between the main components was proposed as a valid criterion for the identification of chemotypes. The EOs belonging to the same genotype and chemotype obtained in different dates from La Paz (Cba), showed differences in the proportion citral:limonene. So for A.triphylla it would not be a valid criterion to define chemotypes.