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Characterization of Nanospheres Containing Zanthoxylum riedelianum Fruit Essential Oil and Their Insecticidal and Deterrent Activities against Bemisia tabaci (Hemiptera: Aleyrodidae)

1
Goiano Federal Institute of Education, Science and Technology-Campus Rio Verde, Rod. Sul Goiana, Km 01, 75901-970 Rio Verde, Brazil
2
Federal University of Goias, Avenida Esperança, s/n, Campus Samambaia, 74690-900 Goiânia, Brazil
3
Brazilian Corporation of Agricultural Research-Embrapa Rice and Bean, Rodovia GO-462, Km 12, Fazenda Capivara, Zona Rural, Caixa Postal 179, 75375-000 Santo Antônio de Goiás, Brazil
4
Federal Institute of Education, Science and Technology of Southeastern Minas Gerais-Campus Barbacena, Rua Monsenhor José Augusto, n 204, Bairro São José, 36205-018 Barbacena, Brazil
5
Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, km 235, CP 676, 13565-905 São Carlos, Brazil
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(8), 2052; https://doi.org/10.3390/molecules23082052
Received: 25 July 2018 / Revised: 9 August 2018 / Accepted: 9 August 2018 / Published: 16 August 2018
(This article belongs to the Section Natural Products Chemistry)
The aim of our study was to produce and characterize poly-ε-caprolactone (PCL) nanospheres containing essential oils from Zanthoxylum riedelianum fruit and to evaluate their stability gains as well as their insecticidal and deterrent activities against whitefly (Bemisia tabaci). The PCL nanospheres exhibited a homogeneous spherical morphology, with particle diameters between 106.7 nm and 129.2 nm, pH of approximately 6, zeta potential (ZP) lower than −19.0 mV and encapsulation efficiency higher than 98%. Only 43% of the nanoencapsulated essential oil (NSEO) was degraded in response to ultraviolet light, whereas the essential oil (EO) degraded by 76% over the same period. In a free-choice test, the NSEO and EO reduced the number of whitefly eggs by approximately 70%. NSEO and EO at 1.5% killed 82.87% and 91.23% of 2nd-instar nymphs of whitefly, respectively. Although NSEO displayed lower insecticidal activity, it offers a greater advantage over the free EO, due to protection conferred by polymer against photodegradation. Therefore, its usage may optimize the maintenance of essential oils in the field through photoprotection and controlled release. Our results suggest that the EO of Z. riedelianum fruit can be used for B. tabaci management strategy; nevertheless, the benefits of NSEO require further evaluation at the field level. View Full-Text
Keywords: GC-MS; nanoprecipitation method; whitefly; PCL GC-MS; nanoprecipitation method; whitefly; PCL
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Pereira, K.D.C.; Quintela, E.D.; Da Silva, D.J.; Do Nascimento, V.A.; Da Rocha, D.V.M.; Silva, J.F.A.; Forim, M.R.; Silva, F.G.; Cazal, C.D.M. Characterization of Nanospheres Containing Zanthoxylum riedelianum Fruit Essential Oil and Their Insecticidal and Deterrent Activities against Bemisia tabaci (Hemiptera: Aleyrodidae). Molecules 2018, 23, 2052.

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