A natural matrix‐supported acetylcholinesterase was prepared from alginate extracted from a green algae commonly found in Egyptian fisheries. The COO− ions of alginate‐entrapped acetylcholinesterase protein molecules forming the basic groups. Calcium ions fixed to the anionic groups contributed to preserving the activity of acetylcholinesterase when stored for long periods of time. The effects of thermal denaturation and of various organophosphorus inhibitors upon the matrix‐supported enzyme have been determined. In all cases the supported enzyme appeared to be less affected by the inhibitor than was the free enzyme.

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