NUTRITIONAL VALUE OF GRAPEFRUIT JUICE PRODUCTS

The purpose of research is to study the nutritional value of grapefruit juice products (reconstituted juice of the trademarks Rich, Ya and juice drink Santal) to clarify and supplement the literature information and identify the most competitive products. Objectives: to study the biochemical parameters, antioxidant activity (AOA) and mineral value of grapefruit juice products. Additional information was obtained on the content of polyphenolic compounds, flavanone glycosides, and antioxidant capacity in drinks. For the first time, the levels of individual mineral elements in these products were determined, mg/kg: Al – 0.31–0.62; B – 0.28–0.48; Ba – 0.04–0.08; Na – 4.7–12.4; Sb – 0.07; Si – 1.0–1.6; Sr – 0.11–0.33; Te – 0.20–0.28 and Zn – 0.15–0.21. The composition of mono- and disaccharides of the studied drinks corresponded to well-known literature data, and their ratio was closest to optimal only in juice. The content of citric acid (11710.3–11920.2 mg/dm3) and antioxidant activity (23.1–29.8 %) did not have sharp fluctuations. The presence of malic acid and potentially hazardous elements (As, Cd, Pb, Hg) in all drinks was not detected. Vitamin C, total polyphenols, naringin and hesperidin, microelements Zn and Cr were contained more in grapefruit juice TM Rich, elements Sr and Te – in juice Ya, Al – in the drink Santal. Based on the results of a study of nutritional value, a competitive advantage was established for grapefruit juice TM Rich. The Santal juice drink was inferior in terms of the amount of biologically active substances to grapefruit juice of both brands.