[Micronutrient composition of grape growing in Dagestan].

Micronutrient content in Pearl Zala, Pearl Saba, Creamy, and Amber Muscat varieties of grape has been determined. The ultimate analysis has been made by the atomic-absorption flame photometry; ascorbic acid has been determined by the titrometric analysis; rutin, niacin, and carotene have been studied by the colorimetric method. It has been found that the content of potassium (2673.8 mg/kg), calcium (349.0 mg/kg), iron (35.9 mg/kg), silicon (611.3 mg/kg), manganese (0.89 mg/kg) and vitamin C (5.3 mg/dm3) was the highest in Pearl Zala grapes, while the content of zinc (0.31 mg/kg), nicotinic acid (10.9 mg/dm3) and carotene (0,33 mg/dm3) was the highest in Pearls Saba. Amber Muscat grape has been found to have the highest concentration of sodium (151.4 mg/kg), phosphorus (466.8 mg/kg), magnesium (221.6 mg/kg), aluminum (68.5 mg/kg), cobalt (0.120 mg/kg) and copper (1.91 mg/kg) in comparison with other grape varieties. It has been found that the content of ascorbic acid and rutin differ 1.5-1.6 fold, of magnesium, iron, silicon and potassium--1.7-1.8 fold, of calcium and phosphorus--2.2-2.5 fold, carotene--4.1 times, aluminum, sodium and nicotinic acid--4.7-5.5 fold, cobalt and copper--8.6-8.7 fold, zinc and manganese--10.3-22.2 fold.