O Seminário de Óptica será realizado nesta terça-feira (23), a partir das 14 horas, no Departamento de Física, com a apresentação do tema “Development and applications of silver nanolarvicides for vector control of Aedes aegypti in the transmission area of ZIKAV”. Ministrado em português, o seminário será conduzido pela professora Audrey N. de Andrade (DF/UFPE).

Resumo

Silver nanoparticles (AgNPs) receive great attention because of their unique characteristics and applications from basic to applied sciences. Recently, studies have also shown applications as larvicides against Aedes aegypti larvae, which generates great interest in public health due to the annual outbreaks Zika virus in Brazil, and all the associated consequences. We synthesized AgNP, using polymethacrylic acid (PMAA) as a stabilizing and reducing agent catalyzed by ultraviolet radiation. The synthesis is clean, quick and low cost, leading to AgNPs with 10 nm average size. Their use as nanolarvicide against Aedes aegypti in laboratory and field simulation will be reported. To check the AgNPs efficiency as larvicide pilot bioassays were performed, in which 20 fourth-instar larvae were placed in 100 ml of water with small concentrations of AgNPs (0.02 to 1.1 ppm). It was observed the mortality of the larvae from 6h and maximum expression of 24h exposure. The values LC50 and CL90 are 0.027, 0.044 ppm, respectively were recorded after 24 hours of exposure. For the simulated field test, the initial efficacy, estimated by larval mortality in the first 96 hours after application of the product, was performed using 50 young instar-L1/recipient (20 liters). It was observed 100% mortality of the larvae in L1-instar in 96 h of exposure of the nanoparticles. The persistence of mortality of the larvae in the L1-instar was observed up to the present moment by five months of exposure of the nanoparticles.