TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The mixture is heated at a temperature of greater than or equal to 150 degrees C, preferably greater than or equal to 170 degrees C, for duration of greater than 60 minutes, preferably in vacuum for mainly producing the insoluble composition. The mixture is heated at a temperature greater than or equal to 140 degrees C, preferably greater than or equal to 150 degrees C, for duration of greater than 20 minutes, preferably less than or equal to 30 minutes, preferably under vacuum, for producing the soluble composition. The process for fabrication of the soluble composition comprises washing the solid product obtained after heating with water and filtering, isolating the soluble composition from the filtrate, preferably by dialysis or by filtration and dried by lyophilization, spraying or spray-drying. Preferred Components: The mixture contains at least two cyclodextrins present each in an amount of greater than or equal to 1 wt.%, preferably greater than or equal to 50 wt.%. The mixture comprises two cyclodextrins, preferably alpha -cyclodextrin/ beta -cyclodextrin mixture, preferably in a ratio of 10/1 to 1/10 or 4/1 to 1/4, alpha -cyclodextrin/ gamma -cyclodextrin mixture, preferably in a ratio of 10/1 to 1/10 or 4/1 to 1/4, or beta -cyclodextrin/ gamma -cyclodextrin mixture, preferably in a ratio of 10/1 to 1/10 or 4/1 to 1/4. The mixture comprises three cyclodextrins, preferably alpha -cyclodextrin/ beta -cyclodextrin/ gamma -cyclodextrin mixture, in which alpha -cyclodextrin/ beta -cyclodextrin ratio is 10/1 to 1/10 or 4/1 to 1/4, the alpha -cyclodextrin/ gamma -cyclodextrin ratio is 10/1 to 1/10 or 4/1 to 1/4, and/or beta -cyclodextrin/ gamma -cyclodextrin ratio is 10/1 to 1/10 or 4/1 to 1/4. The weight ratio of cyclodextrin/crosslinking agent is greater than or equal to 0.5, preferably greater than or equal to 1 or greater than or equal to 3. The catalyst is dihydrogen phosphate, hydrogen phosphate, phosphate, hypophosphites, phosphites of alkaline metal, alkaline metal salt of polyphosphoric acids, carbonates, bicarbonates, acetates, borates, hydroxides of alkaline metals, aliphatic amines, and ammonia, preferably sodium hydrogen phosphate, sodium dihydrogen phosphate and sodium hypophosphite, optionally associated with an inorganic solid support or mixture of mineral solid support such as alumina, silica gels, silica, aluminum silicate, zeolite, titanium oxides, zirconium, niobium oxides, chromium oxides, magnesium or tin oxide for increasing the exchange surface during polymerization. The cyclodextrin is alpha -cyclodextrin, beta -cyclodextrin, gamma -cyclodextrin, and their derivatives, such as hydroxypropyl, methyl, ethyl, sulfobutyl ether or acetyl of alpha -cyclodextrin, beta -cyclodextrin, and gamma -cyclodextrin, and binary or ternary mixture of the cyclodextrin and their derivative. The crosslinking agent is poly carboxylic acid or anhydride of polycarboxylic acid, such as saturated or unsaturated acyclic polycarboxylic acid, saturated or unsaturated cyclic polycarboxylic acid, aromatic polycarboxylic acid, hydroxy polycarboxylic acid, preferably poly(acrylic) acid, poly(methacrylic) acid, 1,2,3,4-butanetetracarboxylic acid, 1,2,3-propane tricarboxylic acid, aconitic acid, octadecapentaenoic acid, 2,3,4-cyclopentanetetracarboxylic acid, mallitic acid, oxydisuccinic acid, and thiodisuccinic acid. In the composition, the formed compound can be positively, negatively charged and/or modified by fatty acid chains, polyethylene glycol, polyvinylpyrrolidone, chitosan, and amino acid. EXAMPLE - In a rector, alpha -cyclodextrin (210 g), citric acid (210 mg) and disodium hydrogen phosphate (10 g) were added. The rector was placed in a microwave. Then the obtained solid residue was washed with three volumes of water (20 ml) and the fraction of wash water (60 ml) was filtered through membrane. The filtrate was dried by spray drying and worked up to obtain polymer based on alpha -cyclodextrin.