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) |
|---|---|
| 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 |
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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)
Cite this
Activities of antioxidants are affected by colloidal properties of oil-in-water and water-in-oil emulsions and bulk oils. / Schwarz, K.; Huang, S. W.; German, J. B.; Tiersch, B.; Hartmann, J.; Frankel, E. N.
In: Journal of Agricultural and Food Chemistry, Vol. 48, No. 10, 2000, p. 4874-4882.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Activities of antioxidants are affected by colloidal properties of oil-in-water and water-in-oil emulsions and bulk oils
AU - Schwarz, K.
AU - Huang, S. W.
AU - German, J. B.
AU - Tiersch, B.
AU - Hartmann, J.
AU - Frankel, E. N.
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
KW - α-Tocopherol
KW - Antioxidants
KW - Bulk oil
KW - Carnosic acid
KW - Emulsifiers
KW - Gallic acid
KW - Methyl carnosoate
KW - Oil/water emulsions
KW - Propyl gallate
KW - Trolox
KW - Water/oil emulsions
UR - http://www.scopus.com/inward/record.url?scp=0033786464&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033786464&partnerID=8YFLogxK
U2 - 10.1021/jf991289a
DO - 10.1021/jf991289a
M3 - Article
C2 - 11052748
AN - SCOPUS:0033786464
VL - 48
SP - 4874
EP - 4882
JO - Journal of Agricultural and Food Chemistry
JF - Journal of Agricultural and Food Chemistry
SN - 0021-8561
IS - 10
ER -