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Extraction of bioactive substances from black chokeberry pomace
Kapiton, Ulyana ; Veselá, Mária (referee) ; Vespalcová, Milena (advisor)
This bachelor thesis deals with the quantification of selected bioactive substances in chokeberry juices, in the extracts of chokeberry and in chokeberry tea. In the theoretical part, there is a botanical description of chokeberry, (Aronia melanocarpa). Furthermore, the chemical properties of aronia and their use in the food, cosmetics industry and in the medicine. At the end of the theoretical part there are presented manual methods for determination of simple saccharides and briefly described selected extraction methods. The experimental part contains the determination of these chemical characteristics of analyzed aronia products: pH, titratable acidity, refractometric determination of dry matter, reducing sugars according to Bertrand's method and gravimetric determination, total phenolics and total anthocyanins. The highest phenolic content 319,54 mg·dm-3 were determined in a sample of aronia tea for 10 min digestion. The highest concentration of anthocyanin dyes was also determined in this tea – 889,49 mg·dm-3.
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Extraction of bioactive substances from black chokeberry pomace
Kapiton, Ulyana ; Veselá, Mária (referee) ; Vespalcová, Milena (advisor)
This bachelor thesis deals with the quantification of selected bioactive substances in chokeberry juices, in the extracts of chokeberry and in chokeberry tea. In the theoretical part, there is a botanical description of chokeberry, (Aronia melanocarpa). Furthermore, the chemical properties of aronia and their use in the food, cosmetics industry and in the medicine. At the end of the theoretical part there are presented manual methods for determination of simple saccharides and briefly described selected extraction methods. The experimental part contains the determination of these chemical characteristics of analyzed aronia products: pH, titratable acidity, refractometric determination of dry matter, reducing sugars according to Bertrand's method and gravimetric determination, total phenolics and total anthocyanins. The highest phenolic content 319,54 mg·dm-3 were determined in a sample of aronia tea for 10 min digestion. The highest concentration of anthocyanin dyes was also determined in this tea – 889,49 mg·dm-3.
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