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Development of the poly(methylene blue) modified graphite electrodes for the electrochemical detection of hydrogen sulphide
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
A comparative study have been undertaken of the electropolymerization and electrochemical properties of deposited electroactive polymer on two different graphite electrode substrates: basal plane highly oriented pyrolytic graphite (HOPG) and pencil-graphite electrode (PGE). Poly(methylene blue) modified electrodes (HOPG/pMB and PGE/pMB) have been prepared by potential cycling in aqueous electrolyte solution containing methylene blue monomer. It has been found that electrochemical properties and electrocatalytic activity of deposited film are greatly influenced by the type of electrode substrate. Developed electrodes have been further investigated as potential sensors for hydrogen sulphide.
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The Preparation and the Characterization of the Cationic Liposomes Carrying New Immunoadjuvant.
Houšť, Jiří ; Nesměrák, Karel (advisor) ; Kozlík, Petr (referee)
The aim of this diploma thesis was preparation, characterization and determination of encapsulation efficiency of the cationic liposomes composed of dimethyldioctadecylammonium bromide (DDAB) and cholesterol carrying new drug MT05 with an immunoadjuvant effect. The influence of the temperature of sonication bath and the influence of the volume of liposomal suspension on the average size of liposomes and their polydispersity index was monitored. The most effective liposome preparation by sonication bath was at temperature of 60 řC. The volume of liposomes undergoing sonication did not influence the resulting values of the average size of liposomes and their polydispersity index. The time of sonication time was 6 hours and could be shortened by using sonication bath with higher output. The determination of encapsulation efficiency was carried out in three separated experiments by HPLC-MS/MS. The encapsulation efficiency of the cationic liposomes was 30.1 ± 8.5 % in the first experiment, 43 ± 25 % in the second, and 32 ± 25 % in the third. The amount of DDAB was determined only in the liposomes prepared in the third experiment. The amount of DDAB in the purified liposomes was 78.9 ± 3.7 % in the first replicate, 65.4 ± 1.8 % in the second and 53.8 ± 1.4 % in the third. The actual molar ratio of MT05...
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Development of method for determining aminoacid loading in solid phase peptide synthesis
Mácha, Hynek ; Nesměrák, Karel (advisor) ; Křížek, Tomáš (referee)
A simple method has been developed to determine amino acid loading in solid phase peptide synthesis. The method is applicable for the most common type of synthesis, which use FMOC as protective group and piperidine as a deprotecting agent. Both products of deprotection reaction are separated by HPLC and determined using an UV detector; an internal standard is added. The method gives true values that have been verified by an independent method. The RSD is 1.52%. The method is more accurate than the published methods and allows the determination from the waste of synthesis. The employing of the internal standard eliminated the necessity of dilution accuracy or known volumes.
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