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Influence of dispersion parameters on formation of vesicular systems
Vajcíková, Katarína ; Smilek, Jiří (oponent) ; Mravec, Filip (vedoucí práce)
The work describes a method for the preparation of catanionic vesicular systems using the method of ultrasonic dispersion in order to find the most suitable parameters for the preparation of a system with long–term physical stability. The parameters compared were the amplitude of the ultrasonic wave, the energy used for dispersion, and the volume of deionized water used to prepare a system consisting of the negatively charged surfactant sodium dodecyl sulfate and the positively charged surfactant hexadecyltrimethylammonium bromide. To increase stability and provide a positive charge, the surfactant dimethyldioctadecylammonium chloride was used and cholesterol was also added to increase stability. The individual systems were compared over time because of their size, zeta potential and turbidity of the solution. Particle size and polydispersity coefficient were measurement by the dynamic light scattering method. The zeta potential was determined by electrophoretic light scattering, and the turbidity was monitored by UV-VIS spectrophotometry based on the measurement of turbidity. The results present the most suitable parameters of ultrasonic dispersion using Bandelin SONOPULS UW 3200. The use of these parameters shows the emergence of systems with long–term physical stability, which means that they can be used for other applications.
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Studium membránových vlastností kataniontových vezikul z nových iontových amfifilních párů SEPT-DS
Vajcíková, Katarína ; Krouská, Jitka (oponent) ; Mravec, Filip (vedoucí práce)
Táto práca popisuje možnosti stanovenia membránových vlastností vezikulárnych systémov tvorených amfifilnými iontovými pármi (IPA), ktoré boli pripravené zmiešaním kladne a záporne nabitými povrchovo aktívnymi látkami, konkrétne kladne nabitým tenzidom karbethopendecinium bromidom (Septonex) a záporne nabitým dodecylsulfátom sodným s prídavkom dioktadecyldimetylamónium chloridu a cholesterolu z dôvodu zvýšenia stability. Takéto systémy sú potenciálnymi nosičmi liečiv a teda ich dôsledná charakterizácia je veľmi dôležitá pre ďalší výskum. V tejto práci sú popísané možnosti štúdia membránových vlastností takýchto systémov pomocou spektrometrických metód, konkrétne fluorescenčnej anizotropie a generalizovanej polarizácie, ktorými bola zisťovaná fluidita a solvatácia dvojvrstvovej membrány v závislosti na množstve pridaného cholesterolu a zmene teploty. Ďalej bola sledovaná veľkosť a stabilita pripravených vezikulárnych systémov vytvorených z nových amfifilných párov pomocou techniky dynamického a elektroforetického rozptylu svetla a nakoniec zistená teplota fázového prechodu použitím metódy diferenčnej skenovacej kalorimetrie.
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Influence of dispersion parameters on formation of vesicular systems
Vajcíková, Katarína ; Smilek, Jiří (oponent) ; Mravec, Filip (vedoucí práce)
The work describes a method for the preparation of catanionic vesicular systems using the method of ultrasonic dispersion in order to find the most suitable parameters for the preparation of a system with long–term physical stability. The parameters compared were the amplitude of the ultrasonic wave, the energy used for dispersion, and the volume of deionized water used to prepare a system consisting of the negatively charged surfactant sodium dodecyl sulfate and the positively charged surfactant hexadecyltrimethylammonium bromide. To increase stability and provide a positive charge, the surfactant dimethyldioctadecylammonium chloride was used and cholesterol was also added to increase stability. The individual systems were compared over time because of their size, zeta potential and turbidity of the solution. Particle size and polydispersity coefficient were measurement by the dynamic light scattering method. The zeta potential was determined by electrophoretic light scattering, and the turbidity was monitored by UV-VIS spectrophotometry based on the measurement of turbidity. The results present the most suitable parameters of ultrasonic dispersion using Bandelin SONOPULS UW 3200. The use of these parameters shows the emergence of systems with long–term physical stability, which means that they can be used for other applications.
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