Sorption of aliphatic ketones from aqueous solutions by starch cryotextures

Capillary gas chromatography was applied to study the sorption of aliphatic ketones (C-6-C-11), including metamers, from aqueous solutions by corn sta rch cryotextures. The amount of ketones sorbed by cryotextures depends line arly oil their concentrations in tile initial sol. Equations describing the concentration dependence of sorption were proposed. Tile shape of sorption isotherms reflects the strength of sorption. The binding constants and the number of binding sites were determined for weakly sorbed ketones. The len gth of alkyl substituent and the position of the functional group are the c rucial factors governing tile sorption of ketones under conditions of exces s binding sites. It was found that the degree of sorption increases with an increase in the carbon chain length from 6 to 9 carbon atoms. The presence of cooperation of binding sites for ketone sorption by cryotextures was de monstrated. The major part of ketones is sorbed irreversibly. This fact poi nts to the formation of supramolecular complexes. Ketones with lower molecu lar masses are better sorbed by cryotextures than by native starch grains.