**4. Conclusions**

Based on the results, the use of different extracts is a valuable choice to improve the qualitative characteristics of O/W emulsions. The specific phenolic composition of extracts plays a key role in the nutritional parameters of vegan mayonnaise. The concentration of hydroxytyrosol and tyrosol transferred in the samples allows slowing down undesirable oxidation process improving the shelf life of products. In addition, the parameters related to the antioxidant capacity of extracts, TPC, DPPH and ABTS assays, evidenced that the enrichment could have potential health—properties for consumers. Even so, all antioxidant assays indicated that the phenolic extracts had high antioxidant activity and for this reason could be considered suitable for use as a high value−added ingredient.

Finally, the results obtained with the use of the phenolic extract (PEB), recovered with the use of only water as a solvent for mayonnaise formulation, opens the way to green methodologies in the recovery of added value molecules from wastewaters. An improvement of the recipe for vegan mayonnaise preparation, with the aim to increase the acceptability of the consumer, could be acquired by adding some ingredients that allow improving the color and taste at an aromatic level.

**Author Contributions:** Conceptualization, A.D.B. and R.R.; methodology, A.D.B., A.G. and R.R; software, A.D.B. and R.R; validation, A.P. and M.P.; formal analysis, A.D.B., R.R. and A.G.; investigation, A.D.B., A.G. and R.R.; resources, M.P.; data curation, A.D.B. and A.P.; writing—original draft preparation, A.D.B. and R.R.; writing—review and editing, A.P and M.P.; visualization, A.D.B., A.P. and M.P.; supervision, A.P. and M.P.; project administration, M.P. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the gran<sup>t</sup> of MIUR (Ministry of Education, University and Research), PRIN 2017JTNK78 "Good-by-Waste".

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.

**Conflicts of Interest:** The authors declare no conflict of interest.
