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자료유형
학술저널
저자정보
저널정보
한국영양학회 Nutritional Sciences Nutritional Sciences Vol.9 No.1
발행연도
2006.2
수록면
48 - 54 (7page)

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초록· 키워드

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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 using2,2'-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-soluhle antioxidants and in human plasma. Albumin(0.5~5g/㎗) and uric acid(0.1~0.5 m㏖/ℓ) increased hydrophilic ORAC values in a dose-dependent fashion(R²=0.97 and 0.98, respectively) but had no impact on lipophilic ORAC values. α-Tocopherol (15~200 μ㏖/ℓ) increased lipophilic ORAC values in a dose-dependent fashion (R²=0.94); neither α-tocopherol nor β-carotene had an impact on hydrophilic ORAC values. However, addition of β-carotene at physiological concentrations (0.23~1.86 μ㏖/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.

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
Literature cited

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