Schoutsen B, De Jong JW. Xanthine oxidase in rabbit plasma after application of a bovine milk preparation to small intestine.
ARCHIVES INTERNATIONALES DE PHYSIOLOGIE ET DE BIOCHIMIE 1984;
92:379-84. [PMID:
6085554 DOI:
10.3109/13813458409080614]
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Abstract
The absorption of xanthine oxidase into the bloodstream was studied in rabbits given a milk/cream preparation, fortified with 130 U bovine milk xanthine oxidase or the milk/cream preparation alone (control). The preparations were injected trans-abdominally into the intestines. The rise of plasma xanthine oxidase/dehydrogenase activity was studied with a radioenzymatic assay with and without NAD+. In rabbits, which received the fortified mixture, the plasma xanthine oxidase increase in 8 h was six times more than the increase in control animals (P less than 0.001). In both groups plasma xanthine dehydrogenase activity increased 3-4 times (P less than 0.001), without a significant difference between the two groups. We estimate that only 0.003%, or about 3 micrograms, of the xanthine oxidase added, is absorbed as an active enzyme from the intestine.
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