Efficacy of the main repellents available in the Brazilian market against Aedes aegypti bites under concentrations applied to pediatric populations

Silva, Bruna Oliveira da; Olivatti, Thainá Oliveira Felicio; Kanda, Rafael Guimarães; Marco, Gustavo Noé de; Santaella, Felipe José; Madeira, Newton Goulart; Haddad, Vidal; Miot, Hélio Amante

doi:10.1590/0037-8682-0438-2016

Cited by 1 publication

(1 citation statement)

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“…Currently, the market offers repellents based on icaridin at concentrations of 10–25%, limiting its application in pregnant women and babies under six months of age. Some products also restrict their use in children under two years of age [ 11 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Polymeric Nanorepellent Systems Containing Geraniol and Icaridin Aimed at Repelling Aedes aegypti

Andrade

Guilger-Casagrande

Germano-Costa

et al. 2022

IJMS

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Repellents are among the leading products used against diseases transmitted by the Aedes aegypti mosquito. However, their indiscriminate use or high concentrations can cause severe adverse reactions, particularly in children and pregnant women. To protect them, nanotechnology is a promising tool to encapsulate active compounds against degradation, increase their effectiveness, and decrease their toxicity, as it can promote the modified release of the active compound. This study aimed to develop polymeric nanocapsules containing the repellent actives geraniol and icaridin using low concentrations of the active component, with the objective of promoting effective activity and greater safety against adverse reactions. The nanocapsules were developed by the interfacial deposition method, and the physicochemical properties of the nanocapsules were evaluated using dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), zeta potential, differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), release kinetics assay, and mathematical modeling. Cell viability was assessed by the MTT assay and genotoxicity analysis using the comet assay. The developed nanocapsules containing geraniol and icaridin showed mean diameters of 260 nm and 314 nm, respectively, with a polydispersity index < 0.2. The nanocapsules showed encapsulation efficiency values of 73.7 ± 0.1% for icaridin and 98.7 ± 0.1% for geraniol. Morphological analysis showed spherical nanocapsules with low polydispersity. The kinetic parameters calculated using the Korsmeyer–Peppas model indicated an anomalous release profile. Cell viability and genotoxicity analyses showed that the nanocapsules did not alter cell viability or damage DNA. The results demonstrate a promising nanostructured system with good physicochemical characteristics and good stability, with repellent activity against Aedes aegypti.

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Section: Introductionmentioning

confidence: 99%