Аннотация:During the past decade, nanotechnologies opened a new era in delivery of plant protection products
through the development of nanosized controlled release systems, such as polymer nanoparticles,
micelles, and so on using a wide variety of materials. To increase the pesticides penetration into the
grain under the presowing seed treatment, a new approach based on non-covalent associates preparation
with natural polysaccharides and oligosaccharides as delivery systems (DSs) was applied. Earlier this
approach was tested on antidote 1,8-naphthalic anhydride (NA). Enhancement of the NA solubility and
penetration into the barley and wheat seeds had been demonstrated.
In the present study these DSs were used to prepare nanocomposites of pesticides (tebuconazole,
imidacloprid, imazalil, prochloraz). The composites formation of the pesticides with poly- and
oligosaccharides was proved by NMR relaxation method. Enhancement of the pesticides solubility and
improvement of its penetration into the seeds of corn and rapeseeds has been detected. The strongest
enhancement of penetration ability was observed for arabinogalactan nanocomposites: 5 folds for
tebuconazole and imidacloprid, and more than 10 folds for imazalil and prochloraz.
Our data show that the effect of polysaccharides and oligosaccharides on the nanopesticides penetration
might be associated with the solubility enhancement, affinity of DSs to the surface of grains and the
modification of cell membranes by poly- and oligosaccharides.
