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Molecules 2018, 23(8), 2070; https://doi.org/10.3390/molecules23082070

Valorization of Olive Pomace-Based Nutraceuticals as Antioxidants in Chemical, Food, and Biological Models

1
Faculty of Pharmacy and Biochemistry, University of Zagreb, Ante Kovačića 1, 10000 Zagreb, Croatia
2
Department of Food Engineering, Faculty of Food Technology and Biotechnology, University of Zagreb, Pijerottijeva 6, 10000, Zagreb, Croatia
3
Faculty of Food Technology, University in Osijek, Franje Kuhača 20, 31000 Osijek, Croatia
*
Author to whom correspondence should be addressed.
Received: 28 July 2018 / Revised: 11 August 2018 / Accepted: 17 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Nutraceuticals and Their Medicinal Importance)
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Abstract

Waste remaining after the production of olive oil (olive pomace) is known to contain significant amounts of phenolic compounds that exert different types of biological activities, primarily acting as antioxidants. In this work, a sustainable approach that combines ultrasound-assisted extraction with food-grade solvents and encapsulation with different types of cyclodextrins was used to prepare olive pomace-based polyphenol rich extracts that were tested as antioxidants in various chemical, food, and biological model systems. Encapsulation with cyclodextrins had a significant positive impact on the chemical composition of obtained extracts and it positively affected their antioxidant activity. Observed effects can be explained by an increased content of polyphenols in the formulations, specific physical properties of encapsulated compounds improving their antioxidant activity in complex food/physiological environment, and enhanced interaction with natural substrates. Depending on the applied model, the tested samples showed significant antioxidant protection in the concentration range 0.1–3%. Among the investigated cyclodextrins, hydroxypropyl-β-cyclodextrin and randomly methylated-β-cyclodextrin encapsulated extracts showed particularly good antioxidant activity and were especially potent in oil-in-water emulsion systems (1242 mg/g and 1422 mg/g of Trolox equivalents, respectively), showing significantly higher antioxidant activity than Trolox (reference antioxidant). In other models, they provided antioxidant protection comparable to commonly used synthetic antioxidants at concentration levels of 2–3%. View Full-Text
Keywords: olive pomace; cyclodextrin encapsulation; antioxidant activity; meat model; β-carotene linoleate model; inhibition of DNA scission; liposome model olive pomace; cyclodextrin encapsulation; antioxidant activity; meat model; β-carotene linoleate model; inhibition of DNA scission; liposome model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Vitali Čepo, D.; Radić, K.; Jurmanović, S.; Jug, M.; Grdić Rajković, M.; Pedisić, S.; Moslavac, T.; Albahari, P. Valorization of Olive Pomace-Based Nutraceuticals as Antioxidants in Chemical, Food, and Biological Models. Molecules 2018, 23, 2070.

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