Role of minor constituents in the photooxidation of virgin olive oil |
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Authors: | M Rahmani A Saari Csallany |
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Affiliation: | (1) Present address: Institut Agronomique et Veterinaire Hassan II, Rabat-Institus, Morocco;(2) Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Ave., 55108 St. Paul, MN |
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Abstract: | Virgin olive oil was photooxidized at 2 and 40°C and at fluorescent light intensities of 0, 620, 2710, and 5340 lux. As expected,
higher fluorescent light intensities induced higher peroxide formation in the oil. The thiobarbituric acid reactive substances
(TBARS) were found to be good indicators of photooxidation during the early stage of the reaction. Pheophytin A and β-carotene
were light- and temperature-sensitive, whereas α-tocopherol and total polyphenols were mostly affected by light. Pheophytin
A functioned as a photosensitizer, resulting in rapid oxidation of the oil. β-Carotene was a strong natural inhibitor of photooxidation
for all light intensities at 2°C, suggesting quenching properties for singlet oxygen. However, β-carotene antioxidant activity
was reduced at 40°C because of its rapid destruction. |
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Keywords: | β -carotene pheophytin photooxidation polyphenols α -tocopherol virgin olive oil |
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