Análisis Comparativo De Caracterización De Aceites Esenciales De Cinco Especies Del Género Baccharis, Colectadas en Tres Condados De La Paz, Bolivia.

Abstract

The essential oils from the leaves of five species of the genus Baccharis, namely Baccharis boliviensis, B. densiflora, B. latifolia, B. papilllosa and B. tola collected in three counties, Cota-Cota, Mecapaca and Carpani at La Paz, Bolivia, were extracted using hydrodistillation procedures and subsequently analyzed by GC/MS. Four of the species were collected in two places of the La Paz valley, in order to establish the changes in composition in function of the place of origin. B. densiflora was collected only in one place because of the scarcely availability of the plant material in the other collecting sites. The essential oils obtained from the five species are composed mainly by monoterpenes, and a less percentage of sesquiterpenes, in addition, few non terpenic components were detected. The only exception was B. latifolia that showed almost the same amount of sesquiterpenes and monoterpenes. The samples of a same species collected at two different sites showed, as a rule, similar GC/MS profiles with the exception of B. tola that showed higher amounts of hydrocarbon sesquiterpenes and lower quantities of cyclic monoterpenes from Carpani to Cota Cota. The analysis of the identified compounds showed that some of them were present in good quantities in all the samples of essential oils examined, like for instance, β-myrcene, D-limonene, αthujene, D-α-pinene, sabinene, L-β-pinene and α-muurolene.