Article
Combined effects of bovine casein or caprine casein and resveratrol on the chemical stability of alpha–tocopherol in sunflower oil-in-water emulsions
2018 ADSA (American Dairy Science Association) Annual Meeting
(2018)
Abstract
The objective of this study was to determine the combined effects of bovine casein or caprine casein and resveratrol on the chemical stability of alpha-tocopherol in sunflower oil-in-water emulsions. The highly hydrophobic nature of caprine caseins types I and II may improve the stability of resveratrol in dairy food systems. Previous studies have reported an increase in the chemical stability of alpha-tocopherol in the oil phase of sunflower oil-in-water emulsions stabilized by whey proteins when the cis-isomer of resveratrol partitioned into the oil-in-water interface. The whey proteins were also useful to entrap a hydrophobic bioactive compound, which is resveratrol. Sunflower oil-in-water emulsion (5% w/w) stabilized with bovine casein or caprine caseins type I and type II (0.5% w/w), alpha-tocopherol (0.015% w/w), and resveratrol (0.024% w/w) was prepared using a high pressure homogenizer. The pH of the emulsions were adjusted to pH 7.0. The chemical stability of alpha-tocopherol was assessed by measuring the change of alpha-tocopherol concentration in the emulsions during incubation at 21oC for 28 days using a HPLC method. The chemical stability of alpha-tocopherol increased significantly (P<0.05) in emulsions with caprine caseins types I and II compared to bovine casein. Microencapsulation of alpha-tocopherol with either caprine casein-resveratrol or bovine casein-resveratrol protected alpha-tocopherol in sunflower oil-in-water emulsions and significantly reduced (P<0.05) the chemical degradation of alpha-tocopherol during 28-days of storage at 21oC compared to the treatments without resveratrol. This information will be useful for understanding the behavior of alpha–tocopherol in dairy foods.
Keywords
- casein,
- alpha-tocopherol,
- resveratrol
Disciplines
Publication Date
Summer June 24, 2018
DOI
https://www.adsa.org/Portals/0/SiteContent/Docs/Meetings/PastMeetings/Annual/2018/ADSA2018_full_abstracts_book.pdf
Citation Information
Mora-Gutierrez, A., Attaie, R., Nuñez de González, M. T., Jung, Y., Kirven J. M., and Woldesenbet, S. Combined effects of bovine casein or caprine casein and resveratrol on the chemical stability of alpha–tocopherol in sunflower oil-in-water emulsions. 2018 ADSA (American Dairy Science Association) Annual Meeting, June 24-27, 2018, Knoxville, Tennessee, U.S.