Abstract
A standard procedure, using ethylenediaminetetra-acetic acid or mineral acid, is described for the extraction of onuphic acid, a phosphorus-rich carbohydrate of high molecular weight, from the tubes of the marine annelid Hyalinoecia tubicola. Under the conditions described, the product is nitrogen-free and homogenous, but, with increasing mechanical treatment, there is an increase in polydispersity. The macromolecule contains 14.4% of phosphorus, measured as inorganic phosphate after oxidation, and colour reactions suggest the presence of hexose and 6-deoxyhexose as the major organic constituents.
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