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Master's Dissertation
DOI
https://doi.org/10.11606/D.100.2020.tde-15012021-105748
Document
Author
Full name
Daniela Aparecida dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Costa, Sirlene Maria da (President)
Gomes, Helena Corrêa de Araujo
Léo, Patricia
Marcicano, João Paulo Pereira
Title in Portuguese
Funcionalização de substrato têxtil com partículas poliméricas carregadas com repelente visando proteção contra o mosquito Aedes aegypti
Keywords in Portuguese
Partículas poliméricas
Polimerização em emulsão
Repelente de insetos
Têxtil técnico
Abstract in Portuguese
Atualmente, estratégias alternativas e inovadoras para o controle de arbovírus (por exemplo, vírus da dengue e vírus Zika transmitidos por mosquitos) por meio do controle de vetores devem ser desenvolvidas, pois promoveriam a prevenção de epidemias recentes. Uma possibilidade de proteção contra essas transmissões é o desenvolvimento de vacinas e / ou antivirais seguras e eficazes para prevenir ou tratar a infecção por arbovírus. Entretanto, nenhuma dessas estratégias alternativas foram licenciadas ou estão disponíveis atualmente. O objetivo deste trabalho foi produzir partículas carregadas com o repelente IR3535® (etil butilacetilaminopropionato) para aplicação em substratos têxteis. Os encapsulados foram produzidos pela técnica polimerização em emulsão sem o uso de surfactantes ou coloides protetores e caracterizados quanto ao tamanho de partícula, por meio de análise de espalhamento dinâmico de luz, medição de potencial zeta, teor de sólido, microscopia eletrônica de varredura, termogravimetria e espectroscopia Raman. Posteriormente, tecidos de malha de algodão foram impregnados com as partículas carregadas com repelente e suas propriedades foram avaliadas por colorimetria instrumental e visual e testes de repelência. Os resultados mostraram que as partículas carregadas com repelente foram obtidas em escala submicrométrica e nanoesferas livres de repelente em escala nanométrica, ambas com potencial zeta negativo, formato esférico e estrutura uniforme. A formação do produto encapsulado com 12,3% de IR3535® foi confirmada por cromatografia líquida de alta eficiência, demonstrando a eficácia do processo de encapsulação. A repelência ao mosquito Aedes aegypti foi revelada por meio de testes in vivo realizados nos substratos têxteis. Os resultados indicaram que o uso de substratos têxteis impregnados com submicropartículas carregadas com repelente de insetos é um sistema promissor de proteção contra o mosquito Aedes aegypti
Title in English
Functionalization of textile substrates with repellent-loaded particles for protection against Aedes aegypti mosquitoes
Keywords in English
Emulsion polymerization
Insect repellent
Polymeric particles
Technical textile
Abstract in English
Currently, alternative and innovative strategies for the control of arboviruses (e.g., dengue virus and Zika virus transmitted by mosquitoes) through vector control must be developed, as they would promote the prevention of recent epidemics. A possibility of protection against these transmissions is the development of safe and effective vaccines and/or antiviral drugs to prevent or treat arbovirus infection. However, at present, none of these alternative strategies have been licensed or are currently available. The objective of this study was to produce particles loaded with the IR3535® (ethyl butylacetylaminopropionate) repellent for application on textile substrates. The encapsulated were prepared by emulsion polymerization without the use of surfactants or protective colloids and characterized through dynamic light scattering analysis, zeta potential measurement, solid content calculation, scanning electron microscopy, thermogravimetry, and Raman spectroscopy. Subsequently, cotton knitted fabrics were impregnated with the repellent-loaded particles and their properties were evaluated by instrumental and visual colorimetry and repellency testing. The results showed that the encapsulated particles were obtained with submicrometer-scale sizes and repellent-free nanospheres with nanometer-scale size, both having a negative zeta potential, a spherical shape, and a uniform structure. The formation of the encapsulated product with 12.3% IR3535® was confirmed by high performance liquid chromatography, demonstrating the effectiveness of the encapsulation process. The repellency against Aedes aegypti mosquitoes was revealed through in vivo tests performed on the textile substrates. The results indicated that the use of textile substrates impregnated with insect-repellent-loaded submicroparticles is a promising system for protection against Aedes aegypti mosquitoes
 
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Publishing Date
2021-09-10
 
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