Chemical composition and acaricidal activity of essential oils from two species of the genus Bauhinia that occur in the Cerrado biome in Brazil. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: da Silva, Karla L. C; da Silva, Milena M. C; de Moraes, Marcilio M.; da Camara, Claudio A. G.; dos Santos, Maria L.; Fagg, Christopher W.
• Is Part Of: Journal of essential oil research. Volume 32:Issue 1(2020)
• Page Start: 23
• Page End: 31
• Publication Date: 2020-01-02
• Subjects: Bauhinia dumosa -- Bauhinia rufa -- Cerrado biome -- essential oil -- Tetranychus urticae; Essences and essential oils -- Periodicals; Oils, Volatile -- Periodicals; Plant Oils -- Periodicals; 547.71
• DOI: 10.1080/10412905.2019.1662338
• Languages: English
• ISSNs: 1041-2905

Abstract

ABSTRACT: Essential oils from the leaves of Bauhinia rufa and B. dumosa collected from the Cerrado biome in central Brazil were obtained by hydrodistillation and analyzed using GC and GC/MS. Both oils had a predominance of sesquiterpenes ( B. rufa : 95.3 ± 0.5%; B. dumosa : 97.2 ± 1.1%). β -Caryophyllene (15.8 ± 0.5%), epi-α -cadinol (12.8 ± 0.4%), γ -muurolene (12.2 ± 0.4%) and α -cadinol (10.0 ± 0.5%) were identified as the major constituents of the B. rufa oil, whereas germacrene B (37.6 ± 1.2%) and ( E )-nerolidol (29.1 ± 0.6%) were the major constituents of the B. dumosa oil. Both oils were toxic to Tetranychus urticae by fumigation ( B. rufa : LC50 = 2.76 µL/L of air; B. dumosa : LC50 = 0.97 µL/L of air) and residual contact ( B. rufa : LC50 = 30.46 µL/mL; B. dumosa : LC50 = 16.44 µL/mL). The results of the two-choice method revealed that the oils affect the behavior of the mite, interfering in its feeding and egg-laying preferences.