Effect of Opuntia ficus-indica flowers maceration on quality and on heat stability of olive oil.

This study was focused on the evaluation of the quality and the oxidative stability of olive oil added with Opuntia ficus-indica flowers. Two different amounts of O. ficus-indica flowers were considered 5 and 15% (w/w). The olive oils were evaluated towards their quality, fatty acids profile, total phenol contents and thermal properties by differential scanning calorimetry. The oxidative stability was also monitored by employing the Rancimat and the oven test based on accelerating the oxidation process during storage. The addition of O. ficus-indica flowers induced an increase in free acidity values and a variation in fatty acids profile of olive oils but values remained under the limits required for an extra-virgin olive oil. The obtained olive oils were nutritionally enriched due to the increase in their phenols content. The oxidative stability was generally improved, mainly in olive oil enriched with 5% Opuntia ficus-indica flowers. These findings proved that this enriched olive oil could be considered as a product with a greater added value.