Nutritional Sciences

The Korean Nutrition Society (한국영양학회)
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Microplate-Based Oxygen Radical Absorbance Capacity (ORAC) Assay of Hydrophilic and Lipophilic Compartments in Plasma

  • Kwak Ho Kyung (Department of Home Economics, Korea National Open University) ;
  • Blumberg Jeffrey B. (Antioxidants Research Laboratory Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University) ;
  • Chen Chung Yen (Antioxidants Research Laboratory Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University) ;
  • Milbury Paul E. (Antioxidants Research Laboratory Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University)
  • Published : 2006.02.01
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Abstract

Methods have been developed to evaluate the total antioxidant capacity of foods and plasma but limitations are associated with their ability to determine precisely the contribution of lipophilic antioxidants in a lipid milieu as well as interactions among them Thus, we modified the Oxygen Radical Absorbance Capacity (ORAC) assay to determine the peroxyradical scavenging ability of both hydrophilic and lipophilic compartments in plasma The hydrophilic ORAC assay was performed in a phosphate buffer system utilizing 2,2'-azobis (2-amidinopropane) dihydrochloride as a peroxyradical generator and fluorescein as the target The lipophilic ORAC assay was carried out in a dimethylsulfoxide :butyronitrile (DMSO/BN, 9:1 v/v) system using 2,2'-azobis (2,4-dimethyl valeronitrile) as a peroxyradical generator and BODIPY C11 581/591 as the target Analyses were conducted in bovine serum supplemented with water - and lipid - soluble antioxidants and in human plasma. Albumin (0.5$\sim$5 g/dL) and uric acid (0.1$\sim$0.5 $\mu$mol/L) increased hydrophilic ORAC values in a dose-dependent fashion ($R^{2}$=0.97 and 0.98, respectively) but had no impact on lipophilic ORAC values. $\alpha$-Tocopherol (15$\sim$200 $\mu$mol/L) increased lipophilic ORAC values in a dose-dependent fashion ($R^{2}$=0.94); neither $\alpha$-tocopherol nor $\beta$-carotene had an impact on hydrophilic ORAC values. However, addition of $\beta$-carotene at physiological concentration (0.23$\sim$1.86 $\mu$mol/L), either alone or in combination with other carotenoids, had no significant impact on lipophilic ORAC values. Thus, while assays of 'total antioxidant capacity' in biological matrices would be a useful research and clinical tool, existing methods are limited by the lack of complete responsiveness to the full range of dietary antioxidants.

Keywords

References

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