Abstract
A survey was made of about 30 species of red algae from the Pacific Coast to find the best starting-material for the isolation, in pure and native form, of the controversial substance, floridean starch. Constantinea subulifera Setchell turned out to be the ideal alga for this purpose. The isolated starches were subjected to a number of physical, chemical, and enzymatic tests in order to bring out possible differences from other starch-family substances, such as amylopectin and glycogen, isolated from higher plants. According to all criteria applied there is no real difference between the various compounds, except for the fact that floridean starch gelatinizes only after very long boiling in water. End-group determinations with the aid of periodate show that the floridean starch molecule is a strongly branched structure somewhat comparable to glycogen.
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