Selected Properties of Juices from Black Chokeberry (Aronia melanocarpa L.) Fruits Preserved Using the PEF Method

Black chokeberry (Aronia melanocarpa L.) fruit and processed berries have very high biological value because they are a rich source of bioactive compounds. The method of black chokeberry juice preservation is of key importance. One of the more recent ways in which semiliquid and liquid products can be preserved is the pulsed electric field (PEF) method. The aim of our study was to compare chosen physical and chemical properties of fresh and PEF-preserved chokeberry fruit juices derived from farms located in the vicinity of Cracow (Kraków). The analysis focused on the physical properties and chemical composition of black chokeberry juices, their bioactive compound content, and antioxidant activity. After using the PEF method, there was an increase in dry weight, sugars, and polyphenols, which could be caused by the slight evaporation of water during the process. During this process, antioxidant activity decreased, and ultra-weak luminescence slightly increased. The process of preserving juices using the PEF method is a good way to preserve the bioactive properties of the obtained aronia juices.