Manufacture of algal chemicals. IV—Laboratory‐scale isolation of fucoidin from brown marine algae

Methods for the extraction and isolation of fucoidin from the common brown algae indigenous to Great Britain have been worked out on the laboratory scale, with a view to the ultimate development of a process suitable for large‐scale production. Extraction involves treatment of the weed with hydrochloric acid at 70° for one hour at pH 2.0–2.5. The crude fucoidin is isolated by fractional precipitation with alcohol, and purified by treatment with formaldehyde.