Bioinsecticide potential of Curcuma zedoaria rhizome essential oil
Potencial bioinseticida do óleo essencial dos rizom as de curcuma zedoaria
Biosci. j. (Online); 35 (4), 2019
Publication year: 2019
In this study the potential bioinseticide of the essential oil (OE) extracted from the rhizomes of the species Curcuma zedoaria (Zingiberaceae) was evaluated. The rhizomes were collected during dormancy (winter) and budding (summer). The EO was obtained by hydrodistillation (2h) and identified by GC/MS. In addition, a multivariate exploratory analysis was done to determine the analysis of the major compounds (PCA). The EO yield in dormancy was 0.61± 0.07 (%) and in budding 0.55 ± 0.08 (%). The bioassays on Aedes aegypti larvae and pupae were done by immersion test at different EO concentrations which ranged from 500.00 to 0.003 mg mL-1 (v/v). The results on the larvae and pupae indicated LC99.9 of (0.01 and 1.38 mg mL-1) for EO in dormancy, and (0.08 and 2.63 mg mL-1) for EO during budding, respectively. The action mechanism of EOs in both periods was determined by autobiographic method evaluating the inhibitory potential on the acetylcholinesterase enzyme, indicating greater inhibition of the EO enzyme during dormancy (0.039 mg mL-1) when compared to the EO during budding (0.156 mg mL-1). The projection representation of the EO chemical classes in both evaluated periods indicated that oxygenated sesquiterpenes are the major compound class (46.99% in dormancy) and (43.59% in budding).
The projection of major chemical compounds of EOs presented three compounds with greater mass flow distancing:
epicurzerenone (18.20% and 12.10%); 1.8 cineole (15.76% and 12.10%) and β-elemene (4.43 and 0.01%) that are found in greater amounts in the dormancy EO when compared to budding, respectively. These results corroborate with the greater potential on Ae. aegypti larvae and pupae found for the dormancy EO. The results are promising because they show in which vegetative cycle phase C. zedoaria EO presents greater bioinsecticidepotential.
Neste trabalho foi avaliado o potencial bioinseticida do óleo essencial (OE) extraído dos rizomas da espécie Curcuma zedoaria (Zingiberaceae), coletados no período de dormência (inverno) e brotação das gemas (verão). O OE foi obtido por hidrodestilação (2h) e identificado por CG/EM foi observado rendimento 0,61 ± 0,07 (%) no óleo da dormência, quando comparado no período de brotação 0,55 ± 0,08 (%). Os bioensaios sobre as larvas e pupas de Aedes aegypti foram realizados pelo teste de imersão em diferentes concentrações dos OEs, que variaram de 500,00 a 0,003 mg mL-1 (v/v). Os resultados sobre as larvas e pupas indicaram uma CL99,9 de (0,01 e 1,38 mg mL-1) para o OE da dormência, e (0,08 e 2,63 mg mL-1) para o OE do período de brotação, respectivamente. Indicando maior atividade do OE da dormência. O mecanismo de ação dos OEs nos dois períodos foi determinado pelo método autobiográfico avaliando o potencial inibitório sobre a enzima acetilcolinesterase. Os resultados indicaram maior inibição da enzima do OE no período de dormência (0,039 mg mL-1), quando comparado ao OE de brotação (0,156 mg mL-1).