Journal of Clinical Biochemistry and Nutrition
Online ISSN : 1880-5086
Print ISSN : 0912-0009
ISSN-L : 0912-0009
Original Articles
Efficient Assay for Total Antioxidant Capacity in Human Plasma Using a 96-Well Microplate
Yasuhiro KambayashiNguyen Thanh BinhHiroki W. AsakuraYuri HibinoYoshiaki HitomiHiroyuki NakamuraKeiki Ogino
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2009 Volume 44 Issue 1 Pages 46-51


In the present study, we tried to establish an efficient assay for total antioxidant capacity (TAC) in human plasma using a 96-well microplate. TAC was assessed using lag time by antioxidants against the myoglobin-induced oxidation of 2,2'-azino-di(3-ethylbenzthiazoline-6-sulfonic acid (ABTS) with hydrogen peroxide, and expressed as Trolox equivalent. The linearity of the calibration curve with Trolox was maintained with the Trolox concentration range from 2.5 μM to 25 μM (R2 = 0.997). The assay was applied to the measurement of TAC in healthy human plasma. Coefficient of variation in intraday assay was 2.4%. Difference was not observed in interday assay. Plasma TAC of men ((569 ± 41) μM Trolox equivalent; n = 6) was higher than that of women ((430 ± 28) μM Trolox equivalent; n = 4). After the vegetable juice was drunk for 1 week, the increase in plasma TAC was observed in almost all the volunteers. In summary, we developed the efficient assay for plasma TAC using a 96-well microplate.

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© 2009 by The Editorial Secretariat of JCBN
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