PHOTOCHEMILUMINESCENT DETECTION OF ANTIRADICAL ACTIVITY .2. TESTING OF NONENZYMIC WATER-SOLUBLE ANTIOXIDANTS

A method for testing und quantification of nonenzymic antioxidants, su ch as ascorbic acid and uric acid, and of polycomponent systems, e.g., blood plasma, is described. This method is based on a photo-induced, chemiluminescence- accompanied, and antioxidant-inhibitable autoxidati on of luminol. The sensitivity of the assay lies in a region of nanomo lar quantities of substances. The interassay variability of the method is lower than 5%, the intraassay variability is 2%. The mean values o f an integral antioxidant capacity (AC) of human blood plasma, measure d with this method as a duration of the chemiluminescence inhibition, were between 10 and 20 arbitrary Units (10 arb.U. = 1 min) per 1 mu l, and showed the age-dependent patterns with maximal values (+/- SD) wi th newborns (n = 7): 20.8 +/- 4.1 arb.U. and aged persons (46 +/- 9.4 years old, n = 16): 15.4 +/- 5.2 arb.U., and minimal with children (7. 3 +/- 3 years old, n = 10): 9.9 +/- 2.6 arb.U. AC of young people (28. 7 +/- 6.5 years old, n = 22) was 12.1 +/- 2.7 arb.U. AC of six tested animal species was lower as that of humans, with maximal values with g uinea pigs: 8.5 arb.U. (mean value) and spontaneously hypertensive rat s: 8.6 arb.U. The lowest values were registered with minipigs: 1.4 arb .U. Mice (strain 17) showed 3.8, Lewis and Wistar rats accordingly 4.6 and 6.2 arb.U.