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Nascimento, Lidiane Diniz do; Silva, Sebastião Gomes; Cascaes, Márcia Moraes; Costa, Kauê Santana da; Figueiredo, Pablo Luis Baia; Costa, Cristiane Maria Leal; Andrade, Eloisa Helena de Aguiar; de Faria, Lênio José Guerreiro
Molecules (Basel, Switzerland), 04/2021, Volume: 26, Issue: 9Journal Article
Leaves of (Verbenaceae) were dried in an oven at 40, 50 and 60 °C and the kinetic of drying and the influence of the drying process on the chemical composition, yield, and DPPH radical scavenging activity of the obtained essential oils were evaluated. The composition of the essential oils was determined with gas chromatography-mass spectrometry and gas chromatography-flame ionization detection analyses. The influence of drying on the chemical composition of the essential oils of was evaluated by multivariate analysis, and their antioxidant activity was investigated via the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The Midilli model was the most appropriate to describe the behavior of drying kinetic data of leaves. Thymol was the major compound for all analyzed conditions; the maximum content was obtained from fresh leaves (62.78 ± 0.63%). The essential oils showed DPPH radical scavenging activity with an average of 73.10 ± 12.08%, and the fresh leaves showed higher inhibition (89.97 ± 0.31%). This is the first study to evaluate the influence of drying on the chemical composition and antioxidant activity of essential oils rich in thymol.
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