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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Preparation of hydrogels with the addition of grape pomace extract
 Mojžíšek, Jan ; Veselá, Mária (referee) ; Kovalčík, Adriána (advisor)
The scope of this bachelor thesis is the preparation of hydrogels with antioxidant properties. These properties are achieved by the addition of grape pomace extract. The theoretical part of the thesis briefly summarizes the basic characteristics of the gels and describes the basic quantities in rheology. Furthermore, the classification, preparation and use of hydrogels are described. Attention is paid in particular to gels falling into the category of edible hydrogels. Information on antioxidants and matolins is also given. In the experimental part, extracts from grape pomace are characterized in terms of carbohydrate content, phenolic compounds and antioxidant properties. The extraction itself was carried out in different concentrated aqueous ethanol solutions. The extract with the highest total antioxidant activity, as determined by the ABTS method, was used for the preparation of the hydrogels. Agarose is used for the preparation of hydrogels. The change in the rheological properties of the hydrogels due to the addition of the prepared extracts was observed. The specific structures in the hydrogels were determined by FTIR.
Detailed record
Preparation of hydrogels with the addition of grape pomace extract
 Mojžíšek, Jan ; Veselá, Mária (referee) ; Kovalčík, Adriána (advisor)
The scope of this bachelor thesis is the preparation of hydrogels with antioxidant properties. These properties are achieved by the addition of grape pomace extract. The theoretical part of the thesis briefly summarizes the basic characteristics of the gels and describes the basic quantities in rheology. Furthermore, the classification, preparation and use of hydrogels are described. Attention is paid in particular to gels falling into the category of edible hydrogels. Information on antioxidants and matolins is also given. In the experimental part, extracts from grape pomace are characterized in terms of carbohydrate content, phenolic compounds and antioxidant properties. The extraction itself was carried out in different concentrated aqueous ethanol solutions. The extract with the highest total antioxidant activity, as determined by the ABTS method, was used for the preparation of the hydrogels. Agarose is used for the preparation of hydrogels. The change in the rheological properties of the hydrogels due to the addition of the prepared extracts was observed. The specific structures in the hydrogels were determined by FTIR.
Detailed record

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