National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Characterization of some super-foods as components of smoothie drinks
Prachárová, Adriana ; Vysoká, Marie (referee) ; Márová, Ivana (advisor)
This bachelor thesis deals with properties of selected fruits and seeds of superfoods, the introduction of their biologically active substances and comparison of their nutritional properties. The theoretical part focuses on characterizing the fruit itself (pineapple, banana, blueberry, kiwi, raspberry and orange) and seeds (chia seeds, poppy seeds and almonds). It is focused on characterization of bioactive substances contained in them, such as polyphenols, flavonoids, antioxidant activity, vitamin C, vitamin E and fatty acids. Further, used methods are described. In the experimental part, the content of the antioxidant activity and biological effects in selected fruits and seeds was measured and concentrations was calculated per 1 g of dry matter. Finally, a sensory analysis consisting of eighteen fruit and seed combinations is introduced. The aim of the thesis was to find out which of tested combinations are nutritionally high and, simultaneously, acceptable for consumer.
Analysis of active substances contained in lavender and thyme extracts
Vašíčková, Milada ; Vysoká, Marie (referee) ; Matoušková, Petra (advisor)
The presented bachelor thesis is focued on active substances contained in lavandula officinalis and common thyme extracts, mainly their possible antimicrobial and antioxidant effects. The theoretical part desrcibes chosen plants, compounds with antimicrobial and antioxidant effects, methods how to obtain and identify said compounds. In the experimental part, aquenous, ethanolic and oil extracts were prepared. Mentioned extracts were spectrophotometrically characterised for total content of polyphenols, total content of flavonoids and antioxidant activity. In conclusion possible applications of extracts in food industry instead of synthetic preservatives and their fotification were discussed.
Development of a new type of energy drinks containing natural active components
Vysoká, Marie ; Hároniková, Andrea (referee) ; Matoušková, Petra (advisor)
The aim of this thesis is the development and preparation of a new energy drink. The theoretical part of the thesis focuses on the comparison of the drinks available in market, the presentation of the main active ingredients and the proposal of enriching the new energy drink. It also describes the possibility of using an encapsulation and the method used to determine specific compound in energy drink or encapsulated particles. In the experimental part of the work, at the beginning, the main content of energy drinks were characterized, for instance caffeine, sugar, polyphenol and vitamin C. Subsequently the energy drink based on selected types of loose teas that were enriched with the encapsulated extract of acai, acerola, maca, goji and ginseng was designed. All extracts contained large amounts of polyphenols and antioxidants. In addition, acerola extracts contained very high amounts of vitamin C. Two types of particles, alginate particles and liposomes were prepared for encapsulation. For all particles, encapsulation efficiency, size, stability, and antioxidant activity were determined. Long-term stability was then monitored within three months. The particles were also exposed to artificial gastric, pancreatic and bile juice. All tested particles showed very good encapsulation efficiency. In terms of long-term storage stability in an aqueous environment. Particularly liposome particles, which also showed high stability by zeta potential measurement, were suitable. On the contrary, in case of alginate particles, when stored in an aqueous medium, the release of active substances occurred. Finally, an energy drink was created and subjected to sensory analysis. The best energy drink was based on black or green tea with alginate particles acai, goji and ginseng.
Determination of propyl gallate on carbon paste electrode
Vysoká, Marie ; Fischer, Jan (referee) ; Zima, Jiří (advisor)
Propyl gallate (PG) is a significant synthetic antioxidant and preservative. Its determination has been studied at carbon paste electrode (CPE) using differential pulse voltammetry (DPV) and high performance liquid chromatography with electrochemical detection (HPLC-ED) and with UV spectrometric detection (HPLC-UV). Concentration dependences were measured in the media of Britton-Robinson buffer (pH 5) and methanol (20 %, v/v) by DPV and the limit of detection 0,6110-7 moldm-3 was obtained. Using HPLC with a mobile phase consisting of 0,01 moldm-3 phosphate buffer (pH 4) and methanol (50 %, v/v) with potential of working electrode E = +0,8 V and detection wavelength λ = 280 nm, concentration dependences were measured. Limit of detection was determined to 0,39 moldm-3 for HPLC-ED and 4,95 moldm-3 for HPLC-UV. After verification of the extraction procedure PG was determined in vegetable oil. The resulting value of 3,2 mgkg-1 corresponds with permited limits.
Using of Buchwald-Hartwig reaction in the synthesis of aromatic tertiary amines
Vysoká, Marie ; Maier, Lukáš (referee) ; Krajčovič, Jozef (advisor)
This Bachelor thesis is focused on the new synthetic approach to Bendamustin drug molecule. Buchwald-Hartwig reaction is the key reaction of the new proces which introduces diethanolamino group into drug substance without treatment with oxirane or 2-halogen ethanol.

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1 VYSOKÁ, Marta
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