*Article* **Functionalization of a Vegan Mayonnaise with High Value Ingredient Derived from the Agro-Industrial Sector**

**Alessandra De Bruno, Rosa Romeo, Antonio Gattuso, Amalia Piscopo \* and Marco Poiana**

Department of AGRARIA, University Mediterranea of Reggio Calabria, Vito, 89124 Reggio Calabria, Italy; alessandra.debruno@unirc.it (A.D.B.); rosa.romeo@unirc.it (R.R.); antonio.gattuso@unirc.it (A.G.); mpoiana@unirc.it(M.P.)

**\*** Correspondence: amalia.piscopo@unirc.it; Tel.: +39-965-1694366

**Abstract:** This work aimed to evaluate the antioxidant effect determined by the addition of phenolic extract on the oxidative stability and quality of vegan mayonnaise. Two different antioxidant extracts containing 100 mg L−<sup>1</sup> of hydroxytyrosol and obtained by olive mill wastewater were used in the preparation. After preliminary studies, already evaluated in other works, on hydrophilic and lipophilic food matrices, the results of this study could contribute to understanding the effects of the enrichment on emulsified food systems with phenolic extracts. The functionalized mayonnaise samples were monitored up to 45 days of storage at 10 ◦C in comparison with a control sample for microbiological, physicochemical, antioxidant, sensory properties and for oxidative stability. The results achieved through this work showed the efficacy of the use of phenolic extract as ingredients for its positive effect on chemical properties of mayonnaise. The adding extracts lead to the increase of oxidative stability with an induction period higher (about 24 h) than the control sample (about 12 h).

**Keywords:** antioxidant activity; mayonnaise; olive mill wastewater; oxidative stability; phenolic extract
