Resumen de Chiral analysis of monoterpenes in volatile oils from propolis
Euclesio Simionatto, Janaina T Facco, Ademir F Morel, Sandro R Giacomelli, Carlos E. B Linares
The essential oils obtained by hydrodistillation from samples of propolis manufactured in three regions of Rio Grande do Sul State at Brazil, were analyzed through CG, CG-MS and chiral phase gas chromatography (CPGC). These analyses display the presence of samples with elevated essential oil purport, when compared with plants. The yields obtained were until 3.8%. The samples exhibited similar composition, with predominance of the monoterpenes α-pinene (5763%), β-pinene (12.5-30.8%) and limonene (1.5-11.2%). In chiral analysis ofthese constituents were observed modifications in the enantiomeric excess of isomers of α-pinene and limonene in relation with source location of the sample, already in the chiral analysis of β-pinene were detected only elevated excess of the enantiomer with the (-) configuration. The antimicrobial activity of the crude essential oil was assayed against five bacteria. The best result was obtained against Staphylococcus aureus.
