Koku moleküllerinin mikrokapsul ve nano gözenekli zeolitlerle kapsüllenmesi

Nanotechnological approach has recently been introduced into fragrance applications. One of these processes involves microencapsulation of fragrances in polymeric microcapsules, and another one is encapsulation of fragrances in nanoporous zeolites to tailor products with controlled release properties. In this thesis, encapsulation of a fragrance has been studied using both polymeric microcapsules and zeolites as fragrance carriers. The polyurethane-urea microcapsules, with diameters 10-80 µm, including a fabric softener fragrance were produced by interfacial polymerization for textile applications. The evaluations of perfumers and the headspace-GC-MS analyses after laundering tests revealed that more fragrances remained on the textiles when softener containing encapsulated fragrance was used. Zeolite X crystals with diameters ranging from 1 to 220 μm were synthesized for examination of zeolites as inorganic fragrance carriers. The effect of initial composition of the reaction mixture and the starting silica source on the crystal size of the product was investigated. The largest crystals were obtained using Cab-O-Sil slurry and triethanolamine in the starting reaction mixture. The adsorption and desorption kinetics of a fragrance molecule, triplal, in the zeolite X crystals with different particle sizes were investigated in order to observe the effect of the particle sizes on the adsorption, desorption processes. The first-order kinetic model results indicated that larger crystals commonly had slower rates for both adsorption and desorption processes. In addition, zeolite X crystals were ion-exchanged with Zn2+ and Cu2+ ions and the antimicrobial behavior of ion-exchanged zeolites with and without fragrance were investigated by modified disc diffusion method. Zn2+ and Cu2+ loaded zeolite samples showed excellent antimicrobial activities against three bacteria Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa, a yeast Candida albicans and a fungus Aspergillus niger. It is concluded that the microcapsules and nanoporous zeolites are effective as fragrance carriers with extended release properties. Potential areas of use are powder detergents, fabric softeners, soaps, gels and other similar household products.