The work is devoted to investigation of polymeric complexes formed by sorbic (trans, trans 2, 4-hexadiene-1-carboxylic) acid (SA) fungicide and poly-N-vinylpyrrolidone (PVP). Formation of PVP and SA complexes in mediums of several organic solvents with different parameter of solubility was considered.
For estimation of immobilizing ability of polymers with different molecular weight method of competitive complexing with use of fluorescent probe of 1-anylinonaphthyl-8-sulfoacid, which is in the free state in the form of no fluorescent dimmer, was used. Obtained results showed that samples with higher molecular weight had greater complexing ability (from fluorescent analysis excitation wave length is 363 nm and peak emission wave length is 480 nm).
For complexes stability analysis the method of equilibrium dialysis was also used. In this case it was also demonstrated that stability of complexes increases with increase of polymeric carrier molecular weight.
Level of polymeric complexes fungicidal activity was evaluated by the standard biotest, the inoculation (Fusarium oxusporum f.sp. radicis-cucumerinum) was carried out in Petri dish on agar plates, prepared with the use of medium, containing polymer derivatives of SA.
As it was shown, polymeric complexes of SA possess higher level of activity than low-molecular acid. At the same time level of activity increased with the decreasing of polymeric carrier molecular weight.
Polymeric esters of SA, prepared by interaction of acid and water-soluble polymeric epoxy-containing carriers with different molecular weight show lower fungicidal activity than polymeric complexes of acid.
Lower activity of systems in which acid was bind by covalent (ester) bond is based on lower speed of polymers hydrolysis. Speed of hydrolysis of these polymeric ethers was analyzed by HPLC method.

References
Shtilman M.I., Tzatzarakis E., Tsatsakis A.M. et al. // Food Additives and Contamination, 2000, V.17, T 12, P.965-971

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