Influence of variety and geographical origin on the lipid fraction of hazelnuts (Corylus avellana L.) from Spain: (III) oil stability, tocopherol content and some mineral contents (Mn, Fe, Cu)

Abstract Induction time, acid value and α-tocopherol content of hazelnut oil and some mineral contents (manganese, iron and copper) of hazelnut kernels cultivated in Catalonia (Spain) are determined. Analysis of variance (ANOVA) showed that statistically significant differences existed for: α-tocopherol content, acid value and copper content in relation to the harvesting year of samples. Significant differences were also found for: induction time, manganese and copper contents in relation to the location of samples. On the other hand, no significant differences were found between varieties. In addition, a correlation study was performed between all parameters included in this work. A strong negative correlation was observed between linoleic acid and manganese content, and also copper content and oil stability (Rancimat).