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Published November 1941 | Published
Journal Article Open

Studies on the respiratory pigment of Urechis eggs


Experiments previously reported (1) have shown that the eggs of the Pacific marine worm, Urechis caupo, contain a reversible oxidation-reduction pigment. The pigment, called urechrome, is autoxidizable and changes color from red to yellow on oxidation. It is soluble in water (reduced form insoluble below pH 5) and in acidified methanol, but insoluble in ether, acetone, chloroform, and neutral alcohol. Evidence for participation of the pigment in cellular respiration has been previously given.

Additional Information

© 1941 American Society of Biological Chemists. Received for publication, June 9, 1941. One of us (N.H.H.) desires to express his gratitude to Professor D.M. Whitaker and Professor C.B. van Niel of Stanford University and the Hopkins Marine Station for their generous aid during his residence there. [N.H.H. was a] National Research Council Fellow in the Natural Sciences, 1939-40.

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