EVALUATION OF THE MINERAL ELEMENT PROFILE OF WASTES OF SOME WINE GRAPE (VITIS VINIFERA L.) VARIETIES

Abstract

In this study, the level of macro and micro elements of six wine grape cultivars were determined in seeds, bagasse (skinand pulp) and pomace (seed, skin and pulp) by inductively coupled plasma mass spectrometry and atomic absorptionspectroscopy after microwave digestion (ICP-AES). The levels of macro and micro elements exhibited a genotypedependent alteration and affected by the part of the berry sampled. Potassium was the predominant macro element inbagasse and pomace, varying from 6.78 g/kg dry weight in pomace (Carignane) to 21.05 g/kg dry weight in bagasse(Cabernet Sauvignon). However, the level of calcium was higher than potassium in seeds and varied between 4.95 g/kg(Kalecik karası) and 6.73 g/kg (Carignane). Seeds were also richer than the bagasse and pomace related with phosphorus,magnesium, and sulfur. Among the micro elements, Fe had the highest amount in all parts of the berries. Its contentranged from 13.9 mg/kg dry weights in bagasse of Semillon to 24.8 mg/kg dry weight in seeds of Syrah. Iron, manganese,zinc and molybdenum in seeds; copper and boron in bagasse were higher amount than the other groups analyzed. Theresults of this study show that all parts of the grape berries are potentially rich sources of mineral elements. So, they couldbe used as a food supplement to improve the nutritive value of the human diet and for some engineering processes in foodindustry.