ANTIOXIANT ACTIVITY OF SOME SUPPLEMENTARY PHENOLIC COMPOUNDS TO CORN OIL UNDER HIGH TEMPERATURE CONDITIONS | ||||
| Journal of Biological Chemistry and Environmental Sciences | ||||
| Volume 3, Issue 2, June 2008, Page 269-287 PDF (275.31 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/bces.2008.431583 | ||||
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| Abstract | ||||
| The effect of some phenolic compounds on the oxidative stability of corn oil during heating at 60, 100 and 180ºC was investigated. This investigation was to search for the most potent antioxidants under high temperature conditions and the relationship between their potency and their chemical structures. Progression of oxidation status was monitored by measurement of peroxide, anisidine, totox values and TBARS content. The Rancimat test was also used to assess the stability of the oil containing phenolic compounds at 100ºC. Results clearly revealed that all of TBHQ, DTBHQ and Gentisic acid (2,5-DHBA) were the most effective antioxidants at elevated temperatures (60, 100, and 180oC). The Rancimat test was found to confirm these results at 100oC. The efficacy of these compounds was higher than that of the commonly- used food antioxidants e.g. BHT, BHA and α-tocopherol. The superiority of these compounds mainly due to the presence of two hydroxyl groups in para position in their structures. Although other phenolic compounds contain the same structural features e.g. 2,5- DHAc and quinizarin, they exhibited prooxidant activity. This may be attributed to the existence of carbonyl group which was found to accelerate markedly the lipid oxidation process through its electrophilic activity feature. The chemical structure of potent antioxidants at high temperatures must be containing two hydroxyl groups in ortho or para position of its benzene ring and the meta position must be free of them or carbonyl group(s) | ||||
| Keywords | ||||
| Key words: Antioxidant - Corn oil - Peroxide value – Anisidine value - Totox value - TBARS - Rancimat - TBHQ - DTBHQ - Gentisic - BHT - BHA - α-Tocopherol - 2; 4-DHAc - 2; 5-DHAc -3; 4-DHBA; 2; 5-DHBA - Quinizarin | ||||
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