Evaluation of the combined effect of thymol, carvacrol and (E)-cinnamaldehyde on Amblyomma sculptum (Acari: Ixodidae) and Dermacentor nitens (Acari: Ixodidae) larvae.

Veterinary Parasitology
Tatiane Pinheiro Lopes NovatoErik Daemon

Abstract

This study aimed at assessing the combined effect of thymol, carvacrol and (E)-cinnamaldehyde on Amblyomma sculptum and Dermacentor nitens larvae. The effects resulting from treatments were evaluated by means of the modified larval packet test. In order to determine the LC50, components of essential oils, the monoterpenes thymol, carvacrol and phenylpropanoid (E)-cinnamaldehyde were individually tested at different concentrations. After determining the LC50, each essential oil component was separately evaluated and then combined with another substance at a 1:1 proportion at the LC50 concentration and at 1/2 and 1/4 of the LC50. For A. sculptum, the lowest LC50 value was obtained for (E)-cinnamaldehyde (1.40 mg/ml), followed by thymol (2.04 mg/ml) and carvacrol (3.49 mg/ml). The same order of effectiveness was observed for D. nitens, with values of 1.68, 2.17 and 3.33 mg/ml, respectively. In the evaluation of component associations of essential oils against A. sculptum larvae, only the combinations between carvacrol and thymol (LC50) and carvacrol and (E)-cinnamaldehyde (1/4 LC50) presented a moderate synergetic effect. In turn, for D. nitens larvae, the combinations between thymol and carvacrol (LC50 and 1/2 LC50) presented a s...Continue Reading

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Citations

Jan 4, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Milena JankowskaMaria Stankiewicz
May 18, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mohammad Reza YoussefiFilippo Maggi
Sep 19, 2019·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Mami KasaharaChisato Kitazawa
Apr 10, 2017·Parasitology Research·Sinval Garcia PereiraLivio Martins Costa Junior
Jul 22, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Katerina SpyridopoulouKaterina Chlichlia
Jul 28, 2016·Parasitology Research·Farzam MasoumiMohaddeseh Abouhosseini Tabari
Mar 9, 2021·Veterinary Parasitology : Regional Studies and Reports·Rafaelle VinturelleEvelize Folly
Mar 9, 2021·Veterinary Parasitology : Regional Studies and Reports·Caio MonteiroMárcia Cristina de Azevedo Prata

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