Polímeros híbridos para a obtenção de sistemas de liberação controlada de repelente volátil para o desenvolvimento de protótipo de controle do Aedes aegypti

Abstract

The Zika virus is a flavivirus spread by the Aedes aegypti mosquito that also transmits Dengue and Chinkungunya diseases. The current forms of control of this vector are through elimination of mosquito breeding, use of insecticides, repellents and others. The present work develops new adsorbent materials based on nanosilica and biomaterials (hybrids) capable of releasing a mosquito repellent for Aedes aegypti. The materials synthesized were characterized by Fourrier Transform Infrared (FTIR), thermogravimetric analysis (TG), Scanning Electron Microscopy (SEM) and Brunauer, Emmett and Teller (BET) analysis and tested with citronella essential oil, a recognized repellent. The materials presented type IV isotherms, with type H1 hysteresis, characteristic of mesoporous materials and presented pore diameters with size between 50Å and 80Å. It is observed that materials based on dry silicachitosan-glutaraldehyde in greenhouse (SCGG) and dry silica-chitosanglutaraldehyde in vacuum (SCGV) showed a more controlled release of citronella essential oil. Thus, the bioassay test was performed using a horizontal double-choice olfatometer (Y-tube). It was observed that the test was most significant between the SCGG adsorbent with citronella and the commercial repellent after 3 hours of release. The same was observed after 4 hours of release, but with highest level of significance. The adsorbent SCGG remained stable during the 4 hours of bioassay, since the commercial repellent lost its active after 2 hours of release. Therefore, the production of a prototype to release controlled volatile repellent is proposed to control the Aedes aegypti mosquito in urban areas of Brazil.