Abstract
Two different processes have been developed for the recovery of hydroxytyrosol (HT) and 3,4-dihydroxyphenyl glycol (DHPG) from olive oil mills waste. The antioxidant activity of several effluents has been characterised by four “in vitro” tests: antiradical capacity (ARC), ferric reducing power (P R) and inhibition of primary and secondary oxidation in lipid systems. HT-containing effluents exhibited higher or similar activity in ARC and P R than equimolecular quantities of vitamins E and C. In oxidative tests they were between both assayed vitamins. Except for commercial Hytolive®2, activities correlated with HT concentration of each sample. DHPG-containing effluent had higher activities than a solution with the same concentration of the synthetic DL-DHPG. This effluent was the most active in ARC and P R tests, its activity being similar to vitamin E in the inhibition of primary oxidation. Both phenolic compounds showed antagonist effect when they coeluted, except for P R assay. These results suggested that due to the low-cost procedure and to the antioxidant activity of effluents, they could be valuable as natural additives for food, pharmaceutical and cosmetic industries.
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Abbreviations
- HT:
-
hydroxytyrosol
- DHPG:
-
3,4-dihydroxyphenyl glycol
- DPPH:
-
2,2-diphenyl-1-picrylhydrazyl (free radical)
- ABAP:
-
2,2′-azobis(2-amidinopropane) dihydrochloride
- SDS:
-
sodium dodecylsulphate
- RT:
-
retention time
- EC50 :
-
amount of antioxidant necessary to decrease the initial absorbance by 50%
- EC25 :
-
amount of antioxidant necessary to decrease the initial absorbance by 25%
- ARC:
-
antiradical capacity
- P R :
-
reducing power
- QE:
-
quercetin equivalent
- POIC:
-
primary oxidation inhibition capacity
- TBARS:
-
thiobarbituric acid reactive species
- R :
-
correlation coefficient
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Acknowledgments
The authors thank GENOSA for the supply of Hytolive®2. Financial support: Junta de Andalucía, Consejería de Innovación, Ciencia y Empresa (projects CAO01-006 and CO3-055).
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Rodríguez, G., Rodríguez, R., Fernández-Bolaños, J. et al. Antioxidant activity of effluents during the purification of hydroxytyrosol and 3,4-dihydroxyphenyl glycol from olive oil waste. Eur Food Res Technol 224, 733–741 (2007). https://doi.org/10.1007/s00217-006-0366-1
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DOI: https://doi.org/10.1007/s00217-006-0366-1