Microcapsules containing citronella essential oil were prepared by complex coacervation
and applied to cotton textiles in order to study the repellent efficacy of the obtained fabrics.
Citronella released from treated textiles was indirectly monitored by the extractable content
of its main components. Repellent activity was assessed by exposure of a human hand
and arm covered with the treated textiles to Aedes aegypti mosquitoes. Fabrics treated with
microencapsulated citronella presented a higher and longer lasting protection from insects
compared to fabrics sprayed with an ethanol solution of the essential oil, assuring a repellent
effect higher than 90% for three weeks. Complex coacervation is a simple, low cost, scalable
and reproducible method of obtaining encapsulated essential oils for textile application.
Repellent textiles were achieved by padding cotton fabrics with microcapsules slurries
using a conventional pad-dry method. This methodology requires no additional investment
for textile finishing industries, which is a desirable factor in developing countries.