Repellency of controlled-release treated cotton fabrics based on cypermethrin and prallethrin

Monochlorotriazinyl-beta-cyclodextrin (MCT-beta-CD) was fixed permanently onto the surface of cotton fabrics. The fixed MCT-beta-CD forms inclusion complexes with insecticides (cypermethrin and prallethrin). MCT-beta-CD-finished cotton fabrics loaded with insecticides are effective in reducing malaria morbidity and mortality due to effective personal protection against mosquitoes. Bioassays show that the treated fabrics have fast action against mosquitoes at the range of concentrations studied. The toxic activity of the treated fabrics increased by increasing the insecticide concentration in the treated fabrics, and also increased by increasing the exposure times. The quantitative analysis results show that there are great losses in the amount of insecticides in blank samples by washing, while treated fabrics retain high amount of insecticides. (C) 2007 Elsevier Ltd. All rights reserved.