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Stanovení biologicky aktivních látek v čerstvých ovocných šťávách
Františová, Gabriela
Fruit is a valuable source of biologically active compounds. These compounds are often contained in minor amounts. A large proportion in fruit is made up of carbohydrates. In this work, the contents of vitamin C, polyphenols, flavonoids, glucose, fructose and sucrose in fresh fruit juices were determined. Aronia, strawberries, josta, raspberries, blackberries, white and blue grapes, white and red currants were obtained from a private garden, blueberries were collected in the wild. The vitamin C and carbohydrate concentrations were determined using HPLC. The total polyphenol and flavonoid contents were measured using spectrophotometry. Of the biologically active compounds, polyphenols were the most abundant in the fruit juices. The highest contents of polyphenols and flavonoids were detected in aronia (7905.81 ± 622.65 mg/l and 4714.82 ± 667.37 mg/l). Josta was the most significant source of vitamin C (721.90 ± 1.79 mg/l). Fructose in white grapes was the highest concentrated compound (93.81 ± 3.74 g/l). The highest glucose content was detected in aronia (83.95 ± 4.80 g/l) and white grapes (90.94 ± 3.48 g/l). Sucrose was detected in strawberries, gooseberries and raspberries.
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