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Percorrer por autor "Moiteiro, C."

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  • Antioxidant Capacity of the Essential Oils From Lavandula luisieri, L. stoechas subsp lusitanica, L. stoechas subsp lusitanica x L. luisieri and L. viridis Grown in Algarve (Portugal)
    Publication . Matos, F.; Miguel, Maria Graça; Duarte, J.; Venancio, F.; Moiteiro, C.; Correia, A. I. D.; Figueiredo, A. C.; Barroso, J. G.; Pedro, L. G.
    The antioxidant capacity of the essential oils isolated from the aerial parts of Lavandula luisieri, L. stoechas subsp. lusitanica, the hybrid L. stoechas subsp. lusitanica x L. luisieri, and L. viridis collected in different regions of Algarve (Portugal), its well as that of butylated hydroxytoluene (BHT), was evaluated using three different methods: free radical scavenging activity using 2,2-diphenyl-1-picrylhydrazyl (DPPH) method, thiobarbituric acid reactive substances assay (TBARS) and reductive potential. The chemical composition of the essential oils wits analyzed by GC and GC/MS. The oils of L. luisieri were mainly constituted by 1,8-cineole (26-34%) and trans-alpha-necrodyl acetate (11-18%), only present in this lavender species. The oils of Lavandula stoechas subsp. lusitanica and the hybrid L. stoechas subsp. lusitanica x L. luisieri were dominated by fenchone (42-44%) and camphor (35-36%). Despite of the morphological resemblances of the L. stoechas subsp. lusitanica x L. luisieri with L. luisieri, no necrodane derivatives were detected ill the hybrid, showing instead a major chemical similarity with L. stoechas oil. Lavandula viridis oil mainly comprised 1,8-cineole (33%) and camphor (20%). The oils of L. luisieri were the most effective as antioxidants, independent of the evaluation method used, although showing always lower antioxidant ability than BHT.
    2009Artigo científico Acesso restrito Ver mais
  • Composition and biological activity of the essential oil peruvian lantana camara
    Publication . Benites, J.; Moiteiro, C.; Miguel, Maria Graça; Rojo, L.; Lopez, J.; Venancio, F.; Ramalho, L.; Feio, S.; Dandlen, S. A.; Casanova, H.; Torres, I.
    The composition of the essential oil from Lantana camara L. (Verbenaccae) obtained by hydrodistillation of the aerial parts was examined by GC, GC/MS, and (13)C-NMR. The GC analysis showed that carvone is the most abundant monoterpene 75.9%, together with limonene 16.9%, accounting for 92.8% of the oil. The major components were also tested by (13)C-NMR analysis of the essential oil. The L. camara oil was assayed against several microorganisms, showing moderate antibacterial activity against the human pathogen Staphylococcus aureus (MIC 200 mu g/ml). High antioxidant activity evaluated by the Trolox equivalent antioxidant capacity assay (TEAC) was found (29.0 mmol Trolox/kg) and relative low anti-inflammatory activity due to its weak ability for inhibiting lipoxygenase (IC(50) = 81.5 mu g/ml).
    2009Artigo científico Acesso aberto Ver mais