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Preparation and characterization of catanionic complexes
Mušková, Alexandra ; Kalina, Michal (referee) ; Mravec, Filip (advisor)
The diploma thesis deals with the preparation and characterization of catanionic complexes and their possible application to pharmaceutics and medicine. The catanionic complexes were prepared by mixing two oppositely charged surfactants with the concentration of 20 mmol·dm3 in various volume ratios. Two systems were analyzed – CTAB + SDS and Septonex + SDS. Both systems were prepared in an aqueous and physiological environment. The turbidimetric analyses provided results of the intensity of turbidity of the prepared mixtures. The size and stability of the prepared particles were determined by DLS and ELS measurements. CTAB-rich samples showed significant viscosity changes and they were therefore characterized by rheological measurements. The results of this work show that the asymmetry of alkyl chains, surfactant selection, temperature, and ionic strength have a significant influence on the properties and self-assembly of surfactants in catanionic complexes.
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Preparation and characterization of quatsomes
Havlíčková, Anna ; Szabová, Jana (referee) ; Mravec, Filip (advisor)
This bachelor thesis deals with preparing and characterizing quatsomes and similar vesicular systems. The preparation consisted of weighing an equimolar amount of sterol and surfactant, hydration with deionized water, and subsequent sonication with an ultrasonic probe with an energy of 5, 10 and 15 kJ. In this work, two types of quatsomes were prepared, the first contained equimolar amounts of cholesterol and cetyltrimethylammonium bromide (CTAB), and the second consisted of cholesterol carbethopendecinium bromide (Septonex). The optimal dispersion energy of 10 kJ was selected for both types based on turbidity measurements, visual observation and dynamic and electrophoretic light scattering analysis. Furthermore, the observed properties were found to be constant from day 7 after sonication. In addition to quatsomes, similar vesicles were prepared, which contained a surfactant in the form of a sulfate salt. Once again, two types were prepared, the first containing sodium dodecyl sulfate (SDS) and cholesterol, the second sodium tetradecyl sulfate (STS) and cholesterol. Based on the same measurements as for quatsomes, optimal dispersion energy of 10 kJ was selected. Furthermore, mixtures with different ratios of cholesterol and a given surfactant were prepared, in which the effect of cholesterol addition was monitored. The analysis of these mixtures was performed by the same methods as the analysis of quatsomes.
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Preparation and characterization of quatsomes
Havlíčková, Anna ; Szabová, Jana (referee) ; Mravec, Filip (advisor)
This bachelor thesis deals with preparing and characterizing quatsomes and similar vesicular systems. The preparation consisted of weighing an equimolar amount of sterol and surfactant, hydration with deionized water, and subsequent sonication with an ultrasonic probe with an energy of 5, 10 and 15 kJ. In this work, two types of quatsomes were prepared, the first contained equimolar amounts of cholesterol and cetyltrimethylammonium bromide (CTAB), and the second consisted of cholesterol carbethopendecinium bromide (Septonex). The optimal dispersion energy of 10 kJ was selected for both types based on turbidity measurements, visual observation and dynamic and electrophoretic light scattering analysis. Furthermore, the observed properties were found to be constant from day 7 after sonication. In addition to quatsomes, similar vesicles were prepared, which contained a surfactant in the form of a sulfate salt. Once again, two types were prepared, the first containing sodium dodecyl sulfate (SDS) and cholesterol, the second sodium tetradecyl sulfate (STS) and cholesterol. Based on the same measurements as for quatsomes, optimal dispersion energy of 10 kJ was selected. Furthermore, mixtures with different ratios of cholesterol and a given surfactant were prepared, in which the effect of cholesterol addition was monitored. The analysis of these mixtures was performed by the same methods as the analysis of quatsomes.
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Preparation and characterization of catanionic complexes
Mušková, Alexandra ; Kalina, Michal (referee) ; Mravec, Filip (advisor)
The diploma thesis deals with the preparation and characterization of catanionic complexes and their possible application to pharmaceutics and medicine. The catanionic complexes were prepared by mixing two oppositely charged surfactants with the concentration of 20 mmol·dm3 in various volume ratios. Two systems were analyzed – CTAB + SDS and Septonex + SDS. Both systems were prepared in an aqueous and physiological environment. The turbidimetric analyses provided results of the intensity of turbidity of the prepared mixtures. The size and stability of the prepared particles were determined by DLS and ELS measurements. CTAB-rich samples showed significant viscosity changes and they were therefore characterized by rheological measurements. The results of this work show that the asymmetry of alkyl chains, surfactant selection, temperature, and ionic strength have a significant influence on the properties and self-assembly of surfactants in catanionic complexes.
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