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Hydroxytyrosol CAS No: 327-97-9
Hydroxytyrosol acetate was synthesized, and the antioxidant activity of this olive oil component was assessed in comparison with that of other olive oil components, namely hydroxytyrosol, oleuropein, 3,4-DHPEA-EA, and α-tocopherol in bulk oil and oil-in-water emulsions. The activity of the compounds was also assessed by scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals. Hydroxytyrosol acetate had a weaker DPPH radical scavenging activity than hydroxytyrosol, oleuropein, or 3,4-DHPEA-EA but it had a radical scavenging activity similar to that of α-tocopherol. In oil, the antioxidant activity of hydroxytyrosol acetate was much higher than that of α-tocopherol or oleuropein, but in an emulsion 3,4-DHPEA-EA and α-tocopherol were more effective as antioxidants than hydroxytyrosol acetate. The antioxidant activity of hydroxytyrosol acetate was rather similar to that of hydroxytyrosol in oil and emulsions despite the difference in DPPH radical scavenging activity. Keywords: Olive oil; hydroxytyrosol; 3,4-DHPEA-EA; oleuropein; hydroxytyrosol acetate; α-tocopherol; emulsion; antioxidants |
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