Walber Ribeiro

Universidade Estadual Vale do Acaraú - UVA, Quimica, Faculty Member

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Tephrosia Toxicaria Pers Essential Oil: Chemical Composition and Larvicidal Activity

Natural Product Communications

The essential oils obtained by hydrodistillation of the leaves, stems, and shoots of Tephrosia to... more The essential oils obtained by hydrodistillation of the leaves, stems, and shoots of Tephrosia toxicaria Pers (Papilionaceae) were analyzed using GC and GC/MS. Germacrene D was the major component (20.7-33.3 %) of the oils of leaves and shoots, whereas spathulenol was the main constituent (42.3%) of the stem oil. The essential oils from the leaves and stems, when tested for activity against mosquito larvae (Aedes aegypti), gave LC 50 values of 81.3 ± 2.9 and 63.1 ± 1.0 ppm, respectively.

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Composition of the Essential Oil of Guarea macrophylla Vahl. ssp. tuberculata (Meliaceae) from Northeast of Brazil

Journal of Essential Oil Research, 2006

The essential oils obtained from fresh leaves of Guarea macrophylla Vahl. ssp. tuberculata Velloz... more The essential oils obtained from fresh leaves of Guarea macrophylla Vahl. ssp. tuberculata Vellozo (Meliaceae) were analyzed by GC and GC/MS. Fourteen volatile compounds were identified in the leaf oil. The major components of the leaf oil were γ-eudesmol (15.3%), α-ylangene (15.1%), δ-cadinene (13.2%), γ-muurolene (11.4%) and β-caryophyllene (10.0%).

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Walber Ribeiro

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