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Advisor(s)
Abstract(s)
Olive pomace is an agro-industrial waste product generated from the olive oil industry and constituted by bioactive compounds with potential applications in several industrial sectors. The purpose of this work was to evaluate the effects of electron beam (e-beam) radiation on olive pomace, specifically on phenolic compounds (by HPLC-DAD-ESI/MS) and the bioactive properties (antioxidant, antiproliferative, and antimicrobial activities) of crude olive pomace (COP) and extracted olive pomace (EOP) extracts. The amount of total flavonoid content and the reducing power of COP extracts were higher than those obtained for EOP extracts. The results suggested that e-beam radiation at 6 kGy increased both total phenolic and total flavonoid contents as well as the reducing power of COP extracts, due to the higher extractability (>2.5-fold) of phenolic compounds from these samples, while decreasing the scavenging activity of extracts. The extracts of both olive pomaces showed antibacterial potential, and COP extracts at 400 µg/mL also presented antiproliferative activity against A549, Caco-2, 293T, and RAW264.7 cell lines, with both properties preserved with the e-beam treatment. All in all, e-beam radiation at 6 kGy appears to be a promising technology to valorize the pollutant wastes of the olive oil industry by enhancing phenolic extractability and bioactive properties and contributing to the environmental and economic sustainability of the olive oil industry.
Description
This work was supported by national funds through FCT/MCTES (PIDDAC): CIMO, UIDB/00690/2020 [DOI: 10.54499/UIDB/00690/2020] and UIDP/00690/2020 [DOI: 10.54499/UIDP/00690/2020]; and SusTEC, LA/P/0007/2020 [DOI: 10.54499/LA/P/0007/2020]; C2TN [UID/Multi/04349/2020]. The authors are grateful for national funding by FCT, Foundation for Science and Technology, through the institutional scientific employment program contract of L. Barros and M.I. Dias and the individual research grant (SFRH/BD/136506/2018) of J. Madureira. The GIP-USAL is funded by the Strategic Research Programs for Units of Excellence [ref CLU-2018-04] and Consejería de Educación de la Junta de Castilla y León [Project SA093P20].
Keywords
Bioactive compounds Bioactivities Ionizing radiation Olive pomace Valorization FCT_UIDB/00690/2020 FCT_UIDP/00690/2020
Citation
Madureira J, Gonçalves I, Cardoso J, Dias MI, Santos PM, Margaça FM, et al. Effects of electron beam radiation on the phenolic composition and bioactive properties of olive pomace extracts. Antioxidants (Basel). 2024;13(5):558.
Publisher
MDPI