Stability of pomegranate peel polyphenols encapsulated in orange juice industry by-product and their incorporation in cookies.

Orange juice by-products are proposed as a "green" wall material for the encapsulation of pomegranate peel extract. Stability of crude and encapsulated peel extract was studied under accelerated storage conditions, in terms of phenolic content, antiradical activity, and color. The obtained extracts were used as biofunctional components in cookies, at a phenolics concentration of 5000 ppm. Their effects on phenolics content, antioxidant activity, color, and sensory attributes during baking and storage were examined. It was observed that a large amount of phenolic compounds was degraded during baking even if they were coated. However, encapsulation had a significant effect (p < 0.05) on the retention and the activities of phenolic compounds as compared to non encapsulated. Moreover, the results showed that the extracts could be incorporated in cookies without negatively affecting sensory quality.