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Changes of antioxidants in selected fruits during long-term freezing
Štindlová, Jitka ; Lichnová, Andrea (referee) ; Márová, Ivana (advisor)
In this bachelor thesis some low molecular weight antioxidants contained in strawberries, raspberries, blueberries and cranberries are described. In the theoretical part also general characteristics of these fruits are introduced. Experimental part was focused on analysis of the changes of selected antioxidant content in the fruits. These changes were monitored during storage in two different conditions – in refrigerator and in freezer. In refrigerator whole fruits were stored for 8 days. The experiment in the freezer was performed for 2 months and the fruits were stored in four different processed forms – as a whole fruit, whole fruit impregnated by sucrose solution, as a pulp and pulp mixed with sucrose. Antioxidant content in fruits was analyzed by HPLC and spectrophotometry. The highest total content of antioxidants was found in strawberries, while the lowest values were found in raspberries. During storage some part of original antioxidant content stayed conserved, the highest content was preserved in blueberries processed as a whole fruits and impregnated whole fruits.
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Senzorická analýza řeckých jogurtů s brusinkovým džemem
Paráková, Jana
The aim of this thesis was to study the available literature on the production of jams, Greek-style yogurt, sensory analysis of yogurts and methodology for FaceReader. Than was made 10 samples of cranberry jam. It was followed by sensory analysis of jams and jams with commercial Greek-style yogurts. Best overal impression did jam from pressed cranberries (50 g of sugar per 100 g of fruit). In category of Greek-style yogurt with jam was rated the best yogurt Elinas with the same jam. It was found that the overal impression was influenced by intensity of sweetness. Using a computer program FaceReader was rated five jams from pressed cranberries. Top jam was again jam from pressed cranberries (50 g of sugar per 100 g of fruit). For evaluation of yogurt with jam using FaceReader was the best another jam from pressed fruit (55 g of sugar per 100 g of fruit).
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Changes of antioxidants in selected fruits during long-term freezing
Štindlová, Jitka ; Lichnová, Andrea (referee) ; Márová, Ivana (advisor)
In this bachelor thesis some low molecular weight antioxidants contained in strawberries, raspberries, blueberries and cranberries are described. In the theoretical part also general characteristics of these fruits are introduced. Experimental part was focused on analysis of the changes of selected antioxidant content in the fruits. These changes were monitored during storage in two different conditions – in refrigerator and in freezer. In refrigerator whole fruits were stored for 8 days. The experiment in the freezer was performed for 2 months and the fruits were stored in four different processed forms – as a whole fruit, whole fruit impregnated by sucrose solution, as a pulp and pulp mixed with sucrose. Antioxidant content in fruits was analyzed by HPLC and spectrophotometry. The highest total content of antioxidants was found in strawberries, while the lowest values were found in raspberries. During storage some part of original antioxidant content stayed conserved, the highest content was preserved in blueberries processed as a whole fruits and impregnated whole fruits.
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Senzorická analýza řeckých jogurtů s brusinkovým džemem
Paráková, Jana
The aim of this thesis was to study the available literature on the production of jams, Greek-style yogurt, sensory analysis of yogurts and methodology for FaceReader. Than was made 10 samples of cranberry jam. It was followed by sensory analysis of jams and jams with commercial Greek-style yogurts. Best overal impression did jam from pressed cranberries (50 g of sugar per 100 g of fruit). In category of Greek-style yogurt with jam was rated the best yogurt Elinas with the same jam. It was found that the overal impression was influenced by intensity of sweetness. Using a computer program FaceReader was rated five jams from pressed cranberries. Top jam was again jam from pressed cranberries (50 g of sugar per 100 g of fruit). For evaluation of yogurt with jam using FaceReader was the best another jam from pressed fruit (55 g of sugar per 100 g of fruit).
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