Mineral Composition of Fruits in Different Walnut (Juglans regia L.) Cultivars
AbstractWalnuts are considered to be a good source of dietary minerals. Mineral composition was determined in nine walnut cultivars(â€˜Mihaelaâ€™, â€˜Roxanaâ€™, â€˜Velnitaâ€™, â€˜Geoagiu 65â€™, â€˜Jupanestiâ€™, â€˜Valcorâ€™, â€˜Valmitâ€™, â€˜Valrexâ€™, â€˜Argesanâ€™) originated from Romania. A Milestone digestionmicrowave system was used for mineralization of solid samples. Microelements: Na, Ca, Mg, Fe, Mn, Cu, Se, Al, Cr, Zn, Sr and Rb weredetermined by using ICP-MS as measurement tool, and K content was determined with an atomic absorption spectrometer in flame,by using as excitation source the cavitar cathode lamp for potassium. Mineral elements content presented significant differences from acultivar to another. Potassium content has varied between 357.1 mg/100g in â€˜Valmitâ€˜ cultivar, and 499.6 mg/100g, in â€˜Geoagiu 65â€™ cultivar, recording significant differences from the average (414.0 mg/100g) in â€˜Velnitaâ€˜, â€˜Roxanaâ€˜and â€˜Argesanâ€˜cultivars. Magnesium content variedbetween 189.2 mg/100 g in â€˜Mihaelaâ€™ cultivar and 278.1 mg/100 g in â€˜Argesanâ€™ cultivar, significant differences from the average (216.6mg/100g) were obtained in cultivars â€˜Geoagiu 65â€˜, â€˜Valrexâ€˜, â€˜Argesanâ€˜. The order of nutritive elements depending on their content/100g of produce was K>Mg>Ca>Mn>Fe> Cu>Zn>Na>Cr>Al>Rb>Sr. Comparing obtained data with the ones existing in the literature,Romanian walnut cultivars proved to be important sources of nutritive elements, and walnut kernel consumption can contribute to a wellbalanced diet.
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