The quality assessment of raw materials for the production of functional juice drinks

Abstract

The present work is aimed at studying the qualitative characteristics of apple fruits growing in the Baikal region and evaluates their technological parameters. The main physicochemical parameters and the total content of phenolic compounds in juice of seven apple breeds are investigated. All fruits were small, their weight varied from 20g (Pepinchik Krasnoyarskiy) to 80 g (Svetloe), the average weight was 40 g (Krasnaya Grozd). The highest juice yield was shown by the variety with the average size (Krasnoyarsk’s Snegirek–71.8 %), the remaining varieties showed about 60 %. The sugar content of fruits varied from 5 to 12.3 g / 100 cm3 in varieties, and the amount of titrated acid (in terms of malic acid) from 4.8 to 10.8 g / dm3. For the fruits of seven varieties the content of macro- and microelements (Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, Zr, Pb and Ba) was analysed by X-ray fluorescence spectrometry. Total phenolic compounds content as well as content of anthocyans and leucoanthocyanin were identified in juice. The content of phenolic substances in juice varied (g / dm3) from 3.6 (Krasnaya Grozd) to 0.3 (Krasnoyarskiy Pepinchik). Qualitative and quantitative composition of the main components of the studied juice shows the feasibility of using the fruits of local apple breeds for the production of functional juice-containing drinks.