Percorrer por autor "Teles, Simone"
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- Effect of geographical origin on the essential oil content and composition of fresh and dried Mentha×villosa Hudson leavesPublication . Teles, Simone; Pereira, J.A.; Santos, Carlos H.B.; Menezes, Renata V.; Malheiro, Ricardo; Lucchese, Angélica M.; Silva, FranceliIn the present work, the effect of the geographical origin on the mass production, and essential oil content and composition of fresh and dry leaves of spearmint (Mentha ×villosa Huds.) was evaluated. Field experiments were conducted in three different municipalities (Amargosa, Cruz das Almas and Santo António de Jesus) from Bahia region (Brazil) and two drying methodologies (natural and artificial with controlled conditions) were assessed. Fresh and dried leaves essential oils were extracted by hydro-distillation and their volatiles were determined by gas chromatography with a flame ionization detector (GC/FID) and by gas chromatography with a mass selective detector (GC/MS). The results showed that Cruz das Almas field reported higher biomass production and Santo Antônio de Jesus higher leaves essential oil content. The natural and artificial drying methodologies affected in a similar way the leaves essential oil content in each region, but they affected considerably their composition. Eighteen volatile constituents were identified, mainly sesquiterpenes and monoterpenes, where piperitenone oxide and germacrene D are in higher abundance. By applying a PCA it was possible to distinguish the fresh leaves from each region from the leaves dried by the different drying methodologies, highlighting the increase of minor compounds, mainly sesquiterpenes in the dried leaves from Santo Antônio de Jesus.
- Geographical origin and drying methodology may affect the essential oil of Lippia alba (Mill) N.E. BrownPublication . Teles, Simone; Pereira, J.A.; Santos, Carlos H.B.; Menezes, Renata V.; Malheiro, Ricardo; Lucchese, Angélica M.; Silva, FranceliLippia alba (Mill.) N.E. Brown, the ginger grass, is a medicinal and aromatic plant widely used in Latin America. In this work the effect of the geographical origin and different drying methodologies on L. alba leaves production, essential oil content and composition were evaluated. Field experiments were conducted in three different municipalities (Amargosa, Cruz das Almas and Santo Antônio de Jesus) from Bahia region (Brazil) and two drying methodologies (traditional and artificial with controlled conditions) were assessed. Fresh and dried leaves essential oils were extracted by hydro-distillation and their volatiles were determined by gas chromatography.The geographical origin affected the mass production, essential oil content and both qualitative and quantitative fractions of their composition. Leaves from Cruz das Almas had higher yield in essential oil content. Overall, 26 oil constituents were identified. Carvone, germacrene D and limonene were the main oil constituents. The drying methodologies combined with the geographic origin influenced essential oil composition showing that L. alba constituents were influenced by post-harvest treatments. Some constituents were sensitive to both methods applied, while some enhanced their content like germacrene D.
- Lippia origanoides H.B.K. essential oil production, composition, and antioxidant activity under organic and mineral fertilization: effect of harvest momentPublication . Teles, Simone; Pereira, J.A.; Muniz de Oliveira, Lenaldo; Malheiro, Ricardo; Lucchese, Angélica M.; Silva, FrancelitEssential oils (EOs) chemical profile is behind a series of bioactive properties highly valued in diversifiedindustrial sectors. Strategies and control of factors affecting EO’s composition are very important andneeded.In this work, the chemical composition, antioxidant activity and production of EO’s from Lippia orig-anoides H.B.K. plants grown under organic and mineral fertilization, and harvested at different plantgrowth stages (T150, T240, T330, T420), were studied.Results demonstrate that EO’s production and composition is not affected by fertilization, both organicand mineral. Nevertheless, plant growth stage influences considerably EO’s composition and antioxidantactivity, reducing EO production. EO’s from grown plants displayed lower antioxidant activity than youngplants. Organic fertilization also displayed better antioxidant potential than EO obtained from mineralfertilization.In order to improve the potentialities and properties of L. origanoides EO’s, plants should be harvestedstill young and organic fertilizers could be applied to improve bioactivity.
- Organic and mineral fertilization influence on biomass and essential oil production, composition and antioxidant activity of Lippia origanoides HBKPublication . Teles, Simone; Pereira, J.A.; Oliveira, Lenaldo Muniz de; Malheiro, Ricardo; Machado, Serly Santigo; Lucchese, Angélica M.; Silva, FrancelitIn the present work, the effect of organic and mineral fertilization were evaluated on biomass produc-tion, essential oil content, essential oil composition, and antioxidant activity in comparison with plantscultivated without fertilization.Field evaluations reported that fertilization does not affect biomass and essential oil production of L.origanoides plants. However some variations were observed in the essential oils composition. Carvacrolwas the most abundant component followed by p-cymene, -terpinene, -caryophyllene, and thymol.Changes observed in the antioxidant potential of the different essential oils may be related to essential oils(EO’s) compositions. Essential oils from organic and mineral fertilization reported, respectively, higherand lower antiradical activity, while no differences were observed in the reducing power of the differenttreatments. Nevertheless, it was possible to partially discriminate the different fertilization treatmentsapplied thanks to the EO’s chemical composition and the bioactive potential.We conclude that for biomass and essential oil production, fertilization plans are not needed in L.origanoides plants at the applied conditions, however if it is necessary to enhance the bioactivity of theessential oils from L. origanoides, organic fertilization is encouraged.