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Basic chemical characteristics of juices of selected red gooseberry varieties
Klatová, Kamila ; Vítová, Eva (referee) ; Vespalcová, Milena (advisor)
This thesis deals with the determination of selected chemical properties red fruit varieties of gooseberries. The theoretical part described the basic biological characteristics of gooseberry, some diseases, pests, and varieties red fruit gooseberries. Furthermore, the work focused on the active substances contained in the fruits of gooseberry with characteristics of the individual substances and the use of gooseberry fruit in the food industry. It was described the principle of individual determination methods of selected parameters gooseberry juice: determination of total and soluble solids, pH, titratable acidity, formol number and determination of reducing carbohydrates. The experimental part of the procedures described basic methods used for the determination of selected chemical characteristics gooseberry fruits and compared with each other. The total solids content ranged from 9,96 to 21,80 wt.%, soluble solids then from 9,80 to 15,19 wt.%, titratable acidity in the range from 261,87 to 410,99 mmol H kg-1, formol number in the range from 6,11 to 38,45 cm3 0.1 mol • dm-3 NaOH per 100 g, amount of reducing carbohydrates was determined at 6,27 to 10,87 wt.%.
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Determination of basic chemical characteristics of blueberry pulp
Strapcová, Zuzana ; Hrstka, Miroslav (referee) ; Vespalcová, Milena (advisor)
This bachelor thesis deals with the investigation of selected chemical characteristics in the semifinished products of blueberries (Vaccinium myrtillus L.) and blueberries high (Vaccinium corymbosum L.). The theoretical part is described the botanical characteristics of both blueberries. The use of fruits is described in the next part. A description of the determination of the selected characteristic, refractometric of sugar dry mater, is described at the end of the theoretical part. In the experimental part, chemical characteristics were determined as total and soluble solids, pH, amount of titratable acids, reducing carbohydrates, phenolics and total anthocyanins in juice, pulp and extracts of blueberries. The purpose of the extracts was to find out how many total anthocyanins and phenolics are found in the skin of the fruit and which extract gives the highest yields. The results of the characteristics were compared across the wholefruit and semifinished products of the both blueberries. A mixture of water and ethanol in a ratio 50:50 was the most suitable solvent. The maximum extraction dependence was at twelfth and thirteenth hours of maceration. The maximum extraction dependence was determined by the above described chemical characteristics. Content of anthocyanin dyes expressed as delphinidin-3-glucoside was determined in extract of blueberry in 59,7 mg DGE100 g-1 and blueberries high in 19,6 mg DGE100 g-1. Total phenolics content expressed as gallic acid was determined in extract of blueberry in 890,9 mg GAE100 g-1 and blueberries high in 249,9 mg GAE100 g-1.
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Determination of basic chemical characteristics of blueberry pulp
Strapcová, Zuzana ; Hrstka, Miroslav (referee) ; Vespalcová, Milena (advisor)
This bachelor thesis deals with the investigation of selected chemical characteristics in the semifinished products of blueberries (Vaccinium myrtillus L.) and blueberries high (Vaccinium corymbosum L.). The theoretical part is described the botanical characteristics of both blueberries. The use of fruits is described in the next part. A description of the determination of the selected characteristic, refractometric of sugar dry mater, is described at the end of the theoretical part. In the experimental part, chemical characteristics were determined as total and soluble solids, pH, amount of titratable acids, reducing carbohydrates, phenolics and total anthocyanins in juice, pulp and extracts of blueberries. The purpose of the extracts was to find out how many total anthocyanins and phenolics are found in the skin of the fruit and which extract gives the highest yields. The results of the characteristics were compared across the wholefruit and semifinished products of the both blueberries. A mixture of water and ethanol in a ratio 50:50 was the most suitable solvent. The maximum extraction dependence was at twelfth and thirteenth hours of maceration. The maximum extraction dependence was determined by the above described chemical characteristics. Content of anthocyanin dyes expressed as delphinidin-3-glucoside was determined in extract of blueberry in 59,7 mg DGE100 g-1 and blueberries high in 19,6 mg DGE100 g-1. Total phenolics content expressed as gallic acid was determined in extract of blueberry in 890,9 mg GAE100 g-1 and blueberries high in 249,9 mg GAE100 g-1.
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Basic chemical characteristics of juices of selected red gooseberry varieties
Klatová, Kamila ; Vítová, Eva (referee) ; Vespalcová, Milena (advisor)
This thesis deals with the determination of selected chemical properties red fruit varieties of gooseberries. The theoretical part described the basic biological characteristics of gooseberry, some diseases, pests, and varieties red fruit gooseberries. Furthermore, the work focused on the active substances contained in the fruits of gooseberry with characteristics of the individual substances and the use of gooseberry fruit in the food industry. It was described the principle of individual determination methods of selected parameters gooseberry juice: determination of total and soluble solids, pH, titratable acidity, formol number and determination of reducing carbohydrates. The experimental part of the procedures described basic methods used for the determination of selected chemical characteristics gooseberry fruits and compared with each other. The total solids content ranged from 9,96 to 21,80 wt.%, soluble solids then from 9,80 to 15,19 wt.%, titratable acidity in the range from 261,87 to 410,99 mmol H kg-1, formol number in the range from 6,11 to 38,45 cm3 0.1 mol • dm-3 NaOH per 100 g, amount of reducing carbohydrates was determined at 6,27 to 10,87 wt.%.
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