Nature of Intestinal Phytase Activity.

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Abstract
Summary Experiments were carried out with chicks, mature hens and weanling rats fed dicalcium phosphate, calcium phytate and sodium phytate as dietary phosphorus sources. Intestinal phytase activity measurements failed to show a significant difference in the activity of this enzyme due to the dietary treatments. The mature hen exhibited lower intestinal phytase activity than did the chick or the rat. The use of mixed substrates, employing sodium phytate and beta-glycerophosphate at equi-molar concentrations, failed to produce an increase in activity as compared to these substrates singly. These data indicated that the phytase activity may have been due to a non-specific phosphatase in the intestinal homogenates. The ratios of alkaline phosphatase to phytase activities in presence or absence of fluoride were the same. These data also point to the presence of only one enzyme system which hydrolyzed both sodium phytate and beta-glycerophosphate.

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