Oleuropein is a bioactive natural product from olives known to display a broad variety of health beneficial
properties. However its presence in most edible olives is lowered due to debittering. In this respect, we
envisaged the incorporation of oleuropein into dairy products (cow’s milk and yogurt) aiming to produce
novel functional foods. Additionally, an analytical method for the monitoring of oleuropein in milk and
yogurt was also developed and validated. Oleuropein was not affected during heat treatment of milk,
while during the milk fermentation process it was not hydrolysed by the produced acids. Oleuropein
was not metabolised by lactic acid bacteria, did not inhibit their growth and its stability in the final products
was proven. The novel products displayed same taste, colour and texture as the conventional ones.
Results herein indicate that oleuropein can be added as an active ingredient in milk and yogurt preparations
to provide two novel functional dairy products.