Abstract
The activity of α-tocopherol, Trolox, propyl gallate, gallic acid, methyl carnosoate, and carnosic acid was studied in two oil-in-water (o/w)emulsions, in two water-in-oil (w/o) emulsions, and in bulk oil with and without added emulsifiers. All antioxidants had either moderate or higher activity in bulk oil than in the emulsions. In most emulsions, the most polar antioxidants, propyl gallate and gallic acid, exhibited either prooxidant activity or no antioxidant activity. Methyl carnosoate was the most active antioxidant in w/o emulsions but was less active than Trolox in o/w emulsions, α-Tocopherol was less active in bulk oil than in emulsions, but its activity in bulk oil was markedly enhanced by the addition of o/w emulsifiers:Partitioning of antioxidants, hydrogen bonding, interphase transport, surface accessibility, and interaction of emulsifier with antioxidants are considered to be important parameters that determine antioxidant activity in lipid-containing systems.
Original language | English (US) |
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Pages (from-to) | 4874-4882 |
Number of pages | 9 |
Journal | Journal of Agricultural and Food Chemistry |
Volume | 48 |
Issue number | 10 |
DOIs | |
State | Published - 2000 |
Keywords
- α-Tocopherol
- Antioxidants
- Bulk oil
- Carnosic acid
- Emulsifiers
- Gallic acid
- Methyl carnosoate
- Oil/water emulsions
- Propyl gallate
- Trolox
- Water/oil emulsions
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)
- Food Science
- Chemistry (miscellaneous)