Nutrient profile of quick frozen berries

The aim of the study is to investigate the nutrient profile of quick-frozen berries of various types. The study object is a variety mix of berries (garden strawberry, pink gooseberry, raspberry, red currant, honeysuckle) harvested in 2022, industrially grown and frozen under the conditions of the IP GK(F)H Filippova A.A. The total content of dry matter and moisture in berries was determined according to GOST 33977-2016, sugars - according to M 04-69-2011, organic acids - according to M 04-47-2012, insoluble dietary fiber - according to GOST R 54014-2010, flavonoids - by the colorimetric method with aluminum chloride according to R 4.1.1672-2003 (rutin was used as a standard sample), mineral substances - according to MUK 4.1.1482-03 and MUK 4.1.1483-03, titratable acidity - according to GOST ISO 750-2013, sugar-acid index - the ratio of the total sugar content to titratable acidity. Determination of antioxidant activity - by an optical method using 2,2-diphenyl-1-picrylhydrazyl (DPPH), determination of the total content of polyphenols - by the Folin-Ciocalteu method with modifications. The obtained results were processed using analysis of variance (ANOVA) followed by the Tukey HSD test. Raspberries have been found to have a reliably high content of insoluble dietary fiber, most mineral elements (Cu+2, Fe+2, P+3, Cr+2, Mg+2, Mn+3, Se+4, Zn+2, Ba+2, B+3, Te+2, Ti+2), honeysuckle has an increased level of polyphenolic and individual mineral substances (Mo+2 and Te+2), gooseberries have increased amounts of citric and succinic acids, flavonoids and some mineral elements (Cu+2, P+3, Cr+2, Mo+2, Ba+2, Na+, Sr+2), strawberries and currants have a relatively high antioxidant activity in addition to increased levels of mineral components, namely Ca+2, К+, Na+, Sr+2 in strawberries and Al+3, Fe+2, Cr+2, Mo+2, Si+2, Ti+2 in currants. Thus, the quick-frozen berries have a nutrient composition specific to each type.