Abstract
Food technology seeks ways to preserve products while maintaining high bioactive properties. Therefore, an attempt was made to assess the effect of the process of impregnation with apple-pear juice and the drying process on the content of bioactive compounds in chokeberry fruit. Chokeberry fruits were subjected to impregnation with apple-pear juice at three levels of vacuum pressure, 4, 6, and 8 kPa; then, they were dried using microwave-vacuum technology. The water activity of the obtained products, the content of fructose, glucose, sorbitol, and polyphenolic compounds, and antioxidant activity were determined. A total of 20 polyphenolic compounds were identified in the fruits and the obtained products (seven anthocyanins, six flavonols, four phenolic acids, and three flavan-3-ols). Preliminary processing, which consisted of introducing the juice ingredients into tissue of the chokeberry fruit, resulted in increased content of bioactive compounds. Moreover, a positive effect of impregnation on the antioxidant stability of the fruit after drying was noted. Water activity in the obtained products showed their microbiological safety. Impregnation at 4 kPa vacuum pressure proved to be the most desirable; in such conditions, the best product in terms of the content of bioactive compounds was obtained.
Highlights
Chokeberry belongs to the Rosaceae family and Pomoideae subfamily
The extract for sugar analysis was prepared as described by Oszmiański, Kolniak-Ostek, Lachowicz, Gorzelany, and Matłok [21]
Studies of dried chokeberry fruit saturated with apple-pear juice showed great protection of the bioactive properties of chokeberry fruit
Summary
Chokeberry belongs to the Rosaceae family and Pomoideae subfamily. This plant is native toNorth America, from where it was taken to Russia and to other European countries, includingPoland, where the largest plantations of this fruit can be found. Chokeberry belongs to the Rosaceae family and Pomoideae subfamily. North America, from where it was taken to Russia and to other European countries, including. Poland, where the largest plantations of this fruit can be found. Chokeberry cultivation does not require expenditure on crop-protection products since, due to their properties, these plants are immune to fungi and other pathogens. Chokeberry prefers humid forests and marshland [1]. Nero) is a berry fruit that is rich in polyphenolic compounds, especially anthocyanins. Chokeberry fruits are characterised by one of the highest contents of anthocyanins and other polyphenols [2,3,4]
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