Recent Findings in the Chemistry of Odorants from Four Baccharis Species and Their Impact as Chemical Markers |
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| Authors: | Manuel Minteguiaga Noelia Umpiérrez Vanessa Xavier Aline Lucas Claudio Mondin Laura Fariña Eduardo Cassel Eduardo Dellacassa |
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| Affiliation: | 1. Cátedra de Farmacognosia y Productos Naturales, Facultad de Química, Universidad de la República (FQ‐UdelaR), Av. General Flores 2124, 11800 Montevideo, Uruguay, (phone: +598‐29244068);2. Laboratório de Opera??es Unitárias (LOPE), Faculdade de Engenharia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6681, CEP: 90619‐900, Porto Alegre, RS, Brasil;3. Departamento de Biodiversidade e Ecologia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6681, CEP: 90619‐900, Porto Alegre, RS, Brasil;4. Laboratorio de Biotecnologia de Aromas, Facultad de Química, Universidad de la República (FQ‐UdelaR), Av. General Flores 2124, 11800 Montevideo, Uruguay |
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| Abstract: | Baccharis is a widespread genus belonging to the Asteraceae family that includes almost 400 species exclusively from the Americas. Even when studied in detail, the taxonomic classification among species from this genus is not yet fully defined. Within the framework of our study of the volatile composition of the Baccharis genus, four species (B. trimera, B. milleflora, B. tridentata, and B. uncinella) were collected from the ‘Campos de Cima da Serra’ highlands of the Brazilian state of Rio Grande do Sul. The aerial parts were dried and extracted by the simultaneous distillation extraction (SDE) procedure. This is the first time that SDE has been applied to obtain and compare the volatile‐extract composition in the Baccharis genus. Characterization of the volatile extracts allowed the identification of 180 peaks with many coeluting components; these latter being detailed for the first time for this genus. The multivariate statistical analyses allowed separating the volatile extracts of the four populations of Baccharis into two separate groups. The first one included the B. milleflora, B. trimera, and B. uncinella volatile extracts. The three species showed a high degree of similarity in their volatile composition, which was characterized by the presence of high contents of sesquiterpene compounds, in particular of spathulenol. The second group comprised the extract of B. tridentata, which contained α‐pinene, β‐pinene, limonene, and (E)‐β‐ocimene in high amounts. |
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| Keywords: | Baccharis trimera Baccharis milleflora Baccharis tridentata Baccharis uncinella Volatile extracts Simultaneous distillation extraction (SDE) GC/MS Analysis Hierarchical cluster analysis (HCA) Principal component analysis (PCA) |
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