Abstract
Alkaline phosphatase, a typical zinc-containing metalloenzyme, has been identified in a dissolved form in sea water. Alkaline phosphatase activity was detected using p-nitrophenyl phosphate as substrate; other characteristics of the enzyme were examined by conventional methods. In addition, the presence of dissolved alkaline phosphatase in sea water has been corroborated by high performance liquid chromatography using a aqueous porous gel column. The molecular weight of the alkaline phosphatase detected in these experiments was 89,000, close to that of E. coli alkaline phosphatase.
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