Abstract
This study was aimed at evaluating the antioxidant activities of carnosic acid and its methyl ester, methyl carnosate, in inhibiting the formation and decomposition of hydroperoxides in bulk and emulsified corn oil triglycerides at 60 °C. In both lipid systems, methyl carnosate was a better antioxidant than carnosic acid, and both were more active than α-tocopherol. The difference in antioxidant activity between methyl carnosate and carnosic acid was greater in emulsion than in bulk systems. Carnosic acid was less stable than methyl carnosate and α-tocopherol in bulk corn oil and 1% Tween 20 micelle solution. The partitioning of carnosic acid into the water phase may explain its low activity in emulsions. The measurement of antioxidant depletion may not be a valid method to evaluate antioxidant activities because the antioxidant activities of carnosic acid and methyl carnosate were not related to their oxidative stability in bulk oil and Tween 20 solution.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2951-2956 |
| Number of pages | 6 |
| Journal | Journal of Agricultural and Food Chemistry |
| Volume | 44 |
| Issue number | 10 |
| State | Published - Oct 1996 |
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Keywords
- α-tocopherol
- Antioxidants
- Carnosic acid
- Corn oil triglycerides
- Emulsion
- Hexanal
- Hydroperoxides
- Interfacial oxidation
- Mechanism
- Methyl carnosate
- Oxidative stability of antioxidants
- Partition coefficient
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)
- Food Science
- Chemistry (miscellaneous)
Cite this
Antioxidant Activity of Carnosic Acid and Methyl Carnosate in Bulk Oils and Oil-in-Water Emulsions. / Huang, Shu Wen; Frankel, Edwin N.; Schwarz, Karin; Aeschbach, Robert; German, J. Bruce.
In: Journal of Agricultural and Food Chemistry, Vol. 44, No. 10, 10.1996, p. 2951-2956.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Antioxidant Activity of Carnosic Acid and Methyl Carnosate in Bulk Oils and Oil-in-Water Emulsions
AU - Huang, Shu Wen
AU - Frankel, Edwin N.
AU - Schwarz, Karin
AU - Aeschbach, Robert
AU - German, J. Bruce
PY - 1996/10
Y1 - 1996/10
N2 - This study was aimed at evaluating the antioxidant activities of carnosic acid and its methyl ester, methyl carnosate, in inhibiting the formation and decomposition of hydroperoxides in bulk and emulsified corn oil triglycerides at 60 °C. In both lipid systems, methyl carnosate was a better antioxidant than carnosic acid, and both were more active than α-tocopherol. The difference in antioxidant activity between methyl carnosate and carnosic acid was greater in emulsion than in bulk systems. Carnosic acid was less stable than methyl carnosate and α-tocopherol in bulk corn oil and 1% Tween 20 micelle solution. The partitioning of carnosic acid into the water phase may explain its low activity in emulsions. The measurement of antioxidant depletion may not be a valid method to evaluate antioxidant activities because the antioxidant activities of carnosic acid and methyl carnosate were not related to their oxidative stability in bulk oil and Tween 20 solution.
AB - This study was aimed at evaluating the antioxidant activities of carnosic acid and its methyl ester, methyl carnosate, in inhibiting the formation and decomposition of hydroperoxides in bulk and emulsified corn oil triglycerides at 60 °C. In both lipid systems, methyl carnosate was a better antioxidant than carnosic acid, and both were more active than α-tocopherol. The difference in antioxidant activity between methyl carnosate and carnosic acid was greater in emulsion than in bulk systems. Carnosic acid was less stable than methyl carnosate and α-tocopherol in bulk corn oil and 1% Tween 20 micelle solution. The partitioning of carnosic acid into the water phase may explain its low activity in emulsions. The measurement of antioxidant depletion may not be a valid method to evaluate antioxidant activities because the antioxidant activities of carnosic acid and methyl carnosate were not related to their oxidative stability in bulk oil and Tween 20 solution.
KW - α-tocopherol
KW - Antioxidants
KW - Carnosic acid
KW - Corn oil triglycerides
KW - Emulsion
KW - Hexanal
KW - Hydroperoxides
KW - Interfacial oxidation
KW - Mechanism
KW - Methyl carnosate
KW - Oxidative stability of antioxidants
KW - Partition coefficient
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UR - http://www.scopus.com/inward/citedby.url?scp=2542593846&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:2542593846
VL - 44
SP - 2951
EP - 2956
JO - Journal of Agricultural and Food Chemistry
JF - Journal of Agricultural and Food Chemistry
SN - 0021-8561
IS - 10
ER -