Chemotype and genotype chemometrical evaluation applied to authentication and traceability of “Tonda Gentile Trilobata” hazelnuts from Piedmont (Italy)

► The analysis of chemotype of raw hazelnuts can reveal their geographic origin. ► Phenolics, fatty acid methyl esters and SDS-PAGE proteins fingerprint were evaluated. ► RAPD genotyping of hazelnut kernels permits to identify amongst different cultivars. ► Hazelnuts clustering was obtained applying Principal Component Analysis (PCA) on data sets. ► Chemotype or genotype analysis coupled to PCA permits the hazelnuts identification.