期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 69, 期 20, 页码 5702-5708出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c01199
关键词
oil-in-water emulsion; alpha-tocopherol; micelle; antioxidant; sodium dodecyl sulfate; anionic surfactant; lipid oxidation
资金
- Italian Ministry of Education, University and Research (MIUR)
- Alma Mater Studiorum-Universita di Bologn
- Fulbright fellowship - Turkish Fulbright Commission
Increased surfactant micelles can enhance the effectiveness of alpha-tocopherol by reducing its prooxidant activity in oil-in-water emulsions. Alpha-tocopherol added post-homogenization led to higher concentrations in the continuous phase when SDS levels exceeded the critical micelle concentration, while pre-emulsification addition did not increase SDS concentrations in the continuous phase.
As emulsifiers become saturated on the surface of an emulsion droplet, any additional emulsifier migrates to the aqueous phase. Continuous phase surfactants have been shown to increase alpha-tocopherol efficacy, but it is unclear if this is the result of chemical or physical effects. The addition of alpha-tocopherol to an oil-in-water emulsion after homogenization resulted in a 70% increase of alpha-tocopherol in the continuous phase when sodium dodecyl sulfate (SDS) was at levels that were greater than the SDS critical micelle concentration. Conversely, when alpha-tocopherol was dissolved in the lipid before emulsification, continuous phase SDS concentrations did not increase. When SDS concentration led to an increase in the aqueous phase alpha-tocopherol, the oxidative stability of oil-in-water emulsions increased. Data indicated that the increased antioxidant activity was the result of surfactant micelles being able to decrease the prooxidant activity of alpha-tocopherol. Considering these results, surfactant micelles could be an important tool to increase the effectiveness of alpha-tocopherol.
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