Processing citrus fruits results in significant amount of wastes; however, citrus by-products still contain high amounts of polyphenolic and other bioactive value-added compounds. In addition, bergamot (Citrus bergamia) wastes contain two compounds—brutieridin and melitidin—which exhibit statin-like properties. Recently, novel fermented products containing bioactive compounds received increasing attention because of their health-promoting functions. In this study, the bioconversion of citrus wastes in vinegars with high content in bioactive and aromatic compounds was performed, detecting a high permanence at the end of the process of the main compounds of interest, especially brutieridin and melitidin. In addition, the sensory analysis of the vinegars was performed, obtaining good performances. According to the adopted preselection procedure, 50 out of the 54 strains of acetic acid bacteria were excluded because of their low aptitude to grow in the tested conditions. The best vinegar was produced from citrus wine at pH 2.90 using the Acetobacter aceti strain DSM_3508T as microbial starter. This research has demonstrated—for the first time—the possibility to produce citrus vinegar at high content of brutieridin and melitidin and other bioactive compounds using selected microbial starters.
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We express our endless gratitude to Prof Giovanni Sindona, Prof. Ferdinando Delfino, and Dr. Demetrio Melissari for their irreplaceable contribution concerning study conception and orchestration of the experiments. We express our sincere gratitude to Dr. Nava Domenico, Dr. Giuliano Delfino, and the staff of the Citrus Juices Company (Reggio Calabria) for their collaboration in the realization of the experiments.
The study was not specifically funded; however, Lucia Bartella wishes to thank Italian Ministry of Education, University and Research for its grant n. AIM1899391 - 1 in the framework of the project “Azione I.2, Mobilità dei Ricercatori, PON R&I 2014–2020”.
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Di Donna, L., Bartella, L., De Vero, L. et al. Vinegar production from Citrus bergamia by-products and preservation of bioactive compounds. Eur Food Res Technol (2020). https://doi.org/10.1007/s00217-020-03549-1
- Bioactive compounds
- Citrus bergamia