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Date (Phoenix dactylifera L.) seeds are abundant by-products from the date fruit industry. Date seed extracts and powders have shown various beneficial bioactivities such as protection against neurodegeneration and oxidative stress. It has been suggested that the main compounds responsible for the high antioxidant and biological activities in date seeds are polyphenolic compounds. In addition, potential food applications developed from date seeds have shown promising results, which can ultimately contribute to the sustainability and value addition in the date fruit industry. This study investigated the chemical composition, starch digestive enzyme inhibitory activity and in-vitro bioaccessibility of date seed polyphenols.

Seeds of five date palm varieties grown in Australia (Medjool, Deglet nour, Barhee, Bou sthammi and Dayrie) were used in this study. Free (also called extractable) polyphenols (FPP) were extracted …