Chemical characterization of chestnut cultivars from three consecutive years: Chemometrics and contribution for authentication

► Characterization of representative cultivars of Portuguese PDO chestnuts with highest production levels. ► Results are important to create/update databases/composition tables about chestnut chemical composition. ► Chemical features could be useful in the guarantee of chestnut PDO authenticity. ► Differences by harvesting year and cultivar were statistically assessed. ► A fast and reliable assay (tocopherols/LDA) might classify chestnut samples, conveying economical benefits.