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Abstracts - Maria Clara S Aguiar

REPELLENT ACTION OF ORANGE ESSENTIAL OIL FORMULATED AGAINST Spodoptera frugiperda

Maria Clara S Aguiar1, Barbara E Denadae1, Maria Fátima GF da Silva1, João B Fernandes1, Paulo RS Bittencourt2, Fernando R Scremin2, Moacir R Forim1*

1 Universidade Federal de São Carlos, São Carlos - SP, Brazil

2 Universidade Tecnológica Federal do Paraná, Medianeira - PR, Brazil

* Correspondence: mrforim@ufscar.br

Essential oils are natural products consisting of a complex mixture of different volatile molecules. These substances have awakened the industry of raw material in food, cosmetics, and medications, due to the characteristics as flavor, antimicrobial and antifungal, etc. As a result of all these characteristics, the volatile organic compounds have been applied in the development of alternative agricultural pesticides1,2. Nevertheless, essential oils are a mixer of molecules usually unstable, which are easily degradable. In this sense, there is a necessity to develop specific alternatives to they be use in the field as insecticides3. The development of formulations such as nano, or microcapsules loaded with essential oils is an alternative for their efficient use improving the stability, residual period, biological activities, etc4.

In this context, this study aimed to develop, characterize and evaluate the biological activity of microparticles in powder loaded with orange essential oil.

The process to obtain microparticles was developed by Spray-Drying in order to encapsulate the volatile compounds in a biopolymeric core. Once the microparticles were obtained, they were submitted to characterization analyzing their morphology and surface, thermal features, recovery and encapsulation efficiency.

Studies with controlled release in aqueous media were performed by Headspace extraction too. We observed a greater retention of essential oil in the encapsulated products that in comparison with aqueous essential oil emulsions. A study of the kinetic profile of the release was also conducted and an estimate of the half-life time of the product. Those analyses allowed to carry out a quantitative control of the products.

Finally, the formulated products were submitted to biological assays against insects of Spodoptera frugiperda, the main pest of the corn crops. The presence of such products in the diet initially produced an increase in consumption and in the growth rate. However, pupal malformation, leakage attempts from the system and absence of egg scales (protection against natural enemies) were observed. These results allowed to observe that the formulated product were actives in the S. frugiperda control.

Refs.

1. Velázquez-Nuñez, et al., Food Control 31, 1, 2013.

2. Mnif & Ghribi, Crop Prot. 77, 52, 2015.

3. Isman, et al., Phytochem. Rev. 10, 197, 2011.

4. El Asbahani, et al., Int. J. Pharm. 483, 220, 2015.