INVESTIGADORES
PICOLLO Maria Ines
congresos y reuniones científicas
Título:
Nanosilica for head lice control
Autor/es:
I. ORTEGA INSAURRALDE; C. VASSENA; 49.M.D. GERMANO, G. ROCA ACEVEDO, G.A. MOUGABURE CUETO, A. TOLOZA, C.V. VASSENA AND M.I. PICOLLO; TOLOZA A., M. GERMANO, G. MOUGABURE CUETO, C. VASSENA, E. ZERBA & M.I. PICOLLO
Lugar:
Park City, Utah
Reunión:
Congreso; 5º International Conference on Phthiraptera 2014; 2014
Institución organizadora:
University of Utah
Resumen:
Nanostructured inorganic compounds are considered as environmentally
friendly alternatives for insect pests. Nanomaterials are defined as materials
that have at least one dimension <100 nm and because of their surface-volume
ratios, they exhibit chemical, physical and biological properties distinctly
different from the same materials in the bulk form. Nanosilica (SiO2) was proposed as bio-pesticide
for agricultural and domestic use.
In this study, we used Aerosil®,
a nanostructured silicon dioxide that has been extensively used in the
pharmaceutical industry, to assess the insecticidal activity against
permethrin-resistant head lice. Insects were collected from infested children from 6 to 12
years old in schools of Buenos Aires, Argentina. Each louse was transferred
into a glass dish and 0,2 µl of different solutions of Aerosil® were
applied directly on the dorsal part of the louse. After the contact, the louse
was transferred into filter paper and observed for knockdown (10 m) and
mortality (18 h). The results showed high louse mortality of the product in concentrations
equal or higher than 0,1%. Nanoparticles attached to the cuticle of treated
insects were visible by scanning electron microscope. It is proposed that these nanosilicas were absorbed into the cuticular
lipids and caused death of insects purely by physical means. As a result of this research we developed a highly
effective pediculicide lotion based on silica nanoparticles (NOPUCID CRYSTAL®) which
is actually marketed by ELEA Laboratory in Argentine