Effects of geographical origin and variety on vitamin and mineral composition of hazelnut (Corylus avellana L.) varieties cultivated in Turkey

avellana cinc cobre complexe vitaminique b contenido mineral copper corylus avellana cuivre cultivars fer frutos secos hazelnuts hierro iron magnesio magnesium manganese manganeso mineral content minerales minerals nicotinamida nicotinamide nicotinic acid noisette nuts potasio potassium sodio sodium tocoferoles tocopherol tocopherols turkey turquia turquie variedades varieties vitaminas vitaminas b vitamine vitamins vitamins b zinc