Organizing co mmittee

THE INTERPOLYELECTROLYTE COMPLEXES BASED ON 
CHITOSAN Bombyx mori AND STARCH
 
А. Abdurasulov,
N. Vokhidova, S. Rashidova
 
Institute of Chemistry and Physics of Polymers, Tashkent, st. A. Kadyri, 7b, Republic of 
Uzbekistan, e-mail: [e-mail] 
Recently, the demand for interpolyelectrolyte complexes (IPEC) based on chitosan 
(CS), which are effectively used in medicine, agro-industrial complexes, and other 
industries, is increasing. In particular, fundamental results are being achieved in 
obtaining biologically active preparations based on natural, environmentally safe 
polymers [1, 2].
Based on this, interpolyelectrolyte complexes based on chitosan
 
Bombyx mori
and corn starch were obtained,also their composition and physicochemical 
features were studied. 
By the conductometric titration, method to determine the composition of CS and 
IPECs based on CS/starch. The hydrodynamic characteristics were studied by the 
dynamic light scattering (DLS) method. 
In order to establish the composition of chitosan/starch-based IPECs, the effect of 
starch on the electrical conductivity of chitosan 
Bombyx mori
solution was researched.
For this reason, the initial electrical conductivity of a 0.05% solution of CS was 
determined and the electrical conductivity of the solution was measured during titration 
with a 0.05% starch solution. The result demonstrated, that the minimum conductivity 
was observed in the starch titration curve when the CS/Starch = 1:0.16, mole ratio. 
Consequently, in this ratio, CS amino groups are mutually compensated by the starch 
functional group, tha led to decreased the electrical conductivity solutions. 
The hydrodynamic radius particle of CS, starch and their stoichiometric and non-
stoichiometric IPEC was studied in their solutions. The results established, that the 
particle distribution is asymmetric, which indicating the formation of particles of 
different shapes and sizes.
With increasing starch content in IPEC, at all mole ratios of 
CS/Starch, the sizes of nano- and microparticles increased accordingly. Perhaps, it 
depends on decries in concentration of charged functional groups both polymers in the 
reaction system leads to aggregation of IPEK particles from 200 nm to 650 nm. 
In summary, stoichiometric and non-stoichiometric IPECs were obtained based on 
chitosan and starch. When the CS/starch = 1:0.16, it was found that the macroions react in 
a stoichiometric ratio, that led to toward increase the optical density of the solution and, 
accordingly, the particle size IPEC.