Abstract
Rats were given a single dose of saline, saline supplemented with xanthine oxidase (XO), half cream and half milk (H/H) and H/H supplemented with XO. XO was determined by a spectrophotometric method at 297 nm in serum at 0, 2, 4 and 6 hours after administration. The method is rapid, reliable and compares favorably with reported assays. No significant difference was obtained between the two saline treatments. The XO activity in serum of animals receiving the H/H increased significantly at 2 hours and then decreased. The H/H supplemented with XO demonstrated a maximum activity in serum at 4 hours and then declined to a value similar to that of the H/H treatment and below the XO level at 0 time. The initial increase in XO activity in serum of rats receiving the H/H treatments may indicate that XO is absorbed in the gastrointestinal tract or that the H/H materials stimulated endogenous XO activity.
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