PHYSICOCHEMICAL CHARACTERISTICS AND PHENOLIC COMPOSITION OF JUICE FROM APPLES CULTI-VATED IN THE BAIKAL REGION
Abstract
Physicochemical characteristics (soluble solids, titratable acidity, reducing sugars, vitamin C content, total phenolic content) of 9 cold-hardy apples varieties cultivated in the Baikal region have been studied for their technological evaluation. The fruits were collected in the full-ripe maturity stage in 2016. Phenolic composition of apple juice from Krasnoyarskiy snegirek apple variety was investigated by the HPLC-MS method. A total of 15 phenolic compounds represented by phenolic acids, dihydrochalcones, flavan-3-ols and flavones were identified. The greatest number of compounds belongs to the latter group and is represented by quercetin and its glycosides: quercetin-3-O-glucoside, quercetin-3-O-galactoside, quercetin-3-O-xyloside, quercetin-3-O-arabinoside, quercetin-3-O-rhamnoside, quercetin-3-O-rutinoside. It was shown that physicochemical characteristics of studied samples correspond to technological requirements for raw materials for production of juices and wines. The most promising varieties for production of juices are varieties with high level biologically active substances: Purpurniy (vitamin content C is 21 mg/100 cm3), Krasnoyarskyi snegirek, Krasnoyarskiy seyanets and Malinka (total phenolic content 290, 305 and 348 mg/dm3, respectively).
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