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Disadvantage of some organic pesticides is their low water solubility. Among  other substances, cyclodextrins and modified cyclodextrins were considered as  agents for improving pesticides water solubility. The solubility of poorly  soluble pesticides, dimethoate, simazine, linuron and thiram, was determined  in aqueous solution of methylated-β-cyclodextrin (mbCD) by ultraviolet  spectrophotometry. Methylated-β-cyclodextrin was obtained by the modified  Hawort method and characterized by 1H NMR and HPLC data. The average degree  of substitution was 13.8. Methylation was done either on C-2, C-3, and C-6  atoms of glucopyranose unit therefore obtained product can be assort as  randomly mβCD. Solubility of the studied pesticides in aqueous solution of  mβCD increases in relation to their solubility in water for dimethoate 506,  for simazine167, for thiram 44, and for linuron 20 times. Reactions of  dimethoate and simazine with mβCD were entropy-driven while the inclusion  complexation of mβCD with the linuron and thiram were driven by both,  enthalpy and entropy, as determined by calorimetric measurements. The  observed solubility increment of the investigated pesticides in aqueous  solution of mβCD, suggests that it can be efficiently used in pesticide  solutions formulations and increase their bioavailability, and  biodegradability

Inclusion complexes of pesticides in aqueous solutions of methylated-β-cyclodextrin