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Molecules 2017, 22(4), 621; doi:10.3390/molecules22040621

Essential Oils of Hyptis pectinata Chemotypes: Isolation, Binary Mixtures and Acute Toxicity on Leaf-Cutting Ants

1
Departamento de Engenharia Agronômica, Universidade Federal de Sergipe, São Cristóvão, SE 49100-000, Brazil
2
Departamento de Química, Universidade Federal de Sergipe, São Cristóvão, SE 49100-000, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Isabel C. F. R. Ferreira
Received: 6 March 2017 / Revised: 4 April 2017 / Accepted: 6 April 2017 / Published: 12 April 2017
(This article belongs to the Collection Bioactive Compounds)
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Abstract

Leaf-cutting ants are pests of great economic importance due to the damage they cause to agricultural and forest crops. The use of organosynthetic insecticides is the main form of control of these insects. In order to develop safer technology, the objective of this work was to evaluate the formicidal activity of the essential oils of two Hyptis pectinata genotypes (chemotypes) and their major compounds on the leaf-cutting ants Acromyrmex balzani Emery and Atta sexdens rubropilosa Forel. Bioassays of exposure pathways (contact and fumigation) and binary mixtures of the major compounds were performed. The major compounds identified in the essential oils of H. pectinata were β-caryophyllene, caryophyllene oxide and calamusenone. The essential oils of H. pectinata were toxic to the ants in both exposure pathways. Essential oils were more toxic than their major compounds alone. The chemotype calamusenone was more toxic to A. balzani in both exposure pathways. A. sexdens rubropilosa was more susceptible to the essential oil of the chemotype β-caryophyllene in both exposure pathways. In general, the binary mixtures of the major compounds resulted in additive effect of toxicity. The essential oils of H. pectinata is a raw material of great potential for the development of new insecticides. View Full-Text
Keywords: Lamiaceae; pests; secondary metabolites; essential oils profile; major constituents; bio-insecticide Lamiaceae; pests; secondary metabolites; essential oils profile; major constituents; bio-insecticide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Feitosa-Alcantara, R.B.; Bacci, L.; Blank, A.F.; Alves, P.B.; Silva, I.M.A.; Soares, C.A.; Sampaio, T.S.; Nogueira, P.C.L.; Arrigoni-Blank, M.F. Essential Oils of Hyptis pectinata Chemotypes: Isolation, Binary Mixtures and Acute Toxicity on Leaf-Cutting Ants. Molecules 2017, 22, 621.

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