Unravelling the biological potential of Pinus pinaster bark extracts

Abstract

Natural compounds from agro-food by-products have fostered interest in food industries. The aim of this study was to unravel potential uses for Pinus pinaster bark extracts (PBE). As functional features of this type of extracts are usually attributed to phenolic compounds, the extraction process was studied. Different PBEs were achieved, with high content in phenolic compounds, using different water/ethanol combinations as a solvent. These PBEs were chemically characterized, and their bioactivity and in vitro cell viability were evaluated. Extracts obtained with hydroethanolic solvents had higher content in phenolic and flavonoid compounds. All the PBEs presented high antioxidant, antibacterial and antihyperglycemic activities. Moreover, PBEs have low cytotoxicity and a selective activity against cancer cells as these were negatively affected. These features may allow the extracts to be used in food formulation and processing (as preservatives, antioxidants or bioactive ingredients), but they showed also potential for the pharmaceutical or nutraceutical sectors. ; This research was funded by the Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UIDB/04469/2020 unit and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund (FEDER) under the scope of Norte2020—Programa Operacional Regional do Norte, by program INTERREG V-B Sudoe (REDVALUE, SOE1/P1/E0123) and by project MOBFOOD (POCI-01-0247-FEDER-024524), cofounded by PORTUGAL2020, Lisb@a2020, COMPETE 2020 and the European Union. Zlatina Genisheva is supported by the project OH2O (POCI-01-0145-FEDER-029145) funded by FCT and FEDER under the scope of Programa Operacional de Competividade e Internacionalizaçao (POCI)-COMPETE 2020 and PORTUGAL2020. Pedro Santos is recipient of a fellowship supported by a doctoral advanced training (call NORTE-69-2015-15), funded by the European Social Fund under the scope of Norte2020 (NORTE-08-5369-FSE-000036). ...