Chemical composition and acaricide activity of an essential oil from a rare chemotype of Cinnamomum verum Presl on Rhipicephalus microplus (Acari: Ixodidae).
The Essential Oils (EOs) from the leaves of species Cinnamomum verum J. Presl are used in the pharmaceutical industry for their numerous biological activities. Currently, the main compound of C. verum EO is eugenol which has acaricidal activity; however, a rare chemotype with benzyl benzoate as the main component can be found. Benzyl benzoate is recognized as an acaricide; however, studies of the C. verum EOs benzyl benzoate chemotype on Rhipicephalus microplus were not reported. The aim of this study was to evaluate the acaricide activity of an EO from a rare chemotype of C. verum, as well as purified benzyl benzoate, against larvae and engorged females of R. microplus resistant to amidines and pyrethroids. The EO was extracted from C. verum leaves and the compounds present were identified using a gas phase chromatograph coupled to a mass spectrometer. Efficacy against R. microplus was assessed by the larval packet and the engorged female immersion tests. A rare chemotype of C. verum was found to produce EOs with benzyl benzoate (65.4%) as the main compound. The C. verum essential oil was 3.3 times more efficient on the R. microplus larvae than was benzyl benzoate. However, no differences were found on the R. microplus engorged females. This is the first report regarding the acaricidal activity of C. verum with chemotype benzyl benzoate, and this compound showed acaricidal activity on R. microplus larvae.
Chemistry Postgraduate Program, Federal University of Maranhão, São Luis, MA, Brazil.
Ildenice Nogueira
IN
Monteiro
Chemistry Postgraduate Program, Federal University of Maranhão, São Luis, MA, Brazil.
Odair Dos Santos
ODS
Monteiro
Department of Pathology, Federal University of Maranhão, São Luís, MA, Brazil. Electronic address: livio.martins@ufma.br.
Lívio Martins
LM
Costa-Junior
Department of Pathology, Federal University of Maranhão, São Luís, MA, Brazil.
Aldilene
A
da Silva Lima
Chemistry Postgraduate Program, Federal University of Pará, Belém, PA, Brazil.
Eloisa Helena de Aguiar
EHA
Andrade
Chemistry Postgraduate Program, Federal University of Pará, Belém, PA, Brazil.
José Guilherme Soares
JGS
Maia
Chemistry Postgraduate Program, Federal University of Maranhão, São Luis, MA, Brazil.
Victor Elias
VE
Mouchrek Filho
D056810:Acaricides / Q000737:chemistry / Q000494:pharmacology*; D000818:Animals; D002935:Cinnamomum zeylanicum / Q000737:chemistry*; D005260:Female; D009822:Oils, Volatile / Q000737:chemistry / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry / Q000494:pharmacology*; D048494:Rhipicephalus / Q000187:drug effects*
D056810:Acaricides; D009822:Oils, Volatile; D010938:Plant Oils
Benzyl benzoate; Cattle tick; Cinnamomum; Control