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ORIGINAL ARTICLE
Phenolic Extracts from Vaccinium corymbosum L. Loaded in Microemulsions and Liposomes as Enhancers of Olive Oil Oxidative Stability
1
Faculty of Tourism and Hospitality Management, University of Rijeka, Primorska 42 P.O. Box 97, 51410, Opatija, Croatia,
2
Faculty of Science, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia
3
Institute for Medical Research, University of Belgrade, Dr Subotića Starijeg 4, 11000 Belgrade, Serbia
4
Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
5
Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
6
Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade-Zemun, Serbia
7
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia
8
Faculty of Food Technology and Biotechnology, Centre for Food Technology and Biotechnology, Petra Kasandrića 6, 23000 Zadar, Croatia
Submission date: 2018-05-06
Final revision date: 2018-08-13
Acceptance date: 2018-10-17
Online publication date: 2018-12-03
Publication date: 2018-12-03
Corresponding author
Nikolina Liović
Faculty of Tourism and Hospitality Management, University of Rijeka, Primorska 42 P.O. Box 97, 51410, Opatija, Croatia, Tel.: +385 51 294 707; Fax: +385 51 292 945
Faculty of Tourism and Hospitality Management, University of Rijeka, Primorska 42 P.O. Box 97, 51410, Opatija, Croatia, Tel.: +385 51 294 707; Fax: +385 51 292 945
Pol. J. Food Nutr. Sci. 2019;69(1):23-33
KEYWORDS
ABSTRACT
Natural phenolic compounds are recognized as bioactive ingredients in food but can also have a role as effective alternatives to synthetic antioxidants in stability improvement of foods prone to oxidation, such as edible oils. This study aimed at the preparation and HPLC-DAD characterization of phenolic extracts from Vaccinium corymbosum L. (raw, pasteurized, freeze-dried and treated with high-intensity ultrasound), and at testing their antioxidant potential in the prevention of olive oil oxidation in the native state and encapsulated into microemulsions and liposomes systems. Water-in-oil structured microemulsions used in this study were prepared using mechanical, ultrasonic, and high pressure homogenization. Liposomes with the average size of 589.1±2.9 nm were produced with the proliposome method using commercially available phosphatidylcholine – Phospolipon 90G. The obtained results showed significant prolongation of the oxidative stability of extra virgin olive oil enriched with encapsulated blueberry phenolic extracts than with native phenolic extracts, regardless of the method used for blueberry processing. Phenolic extracts encapsulated in microemulsions had a stronger effect on the prolongation of olive oil oxidative stability in comparison with the extracts encapsulated in liposomes. The average prolongation rate of oxidative stability was 45.65% by phenolic extracts encapsulated in microemulsions prepared by mechanical homogenization (p=0.012), and 58.72% by microemulsions prepared by ultrasound homogenization (p=0.011). Phenolic extracts encapsulated in microemulsions prepared by high pressure homogenization had no effect on oil oxidative stability prolongation.
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