Abstract
Pharmacologically-active amines such as histamine and hordenine are of limited occurrence in European marine algae. However, hey are present in high levels in some algae used as a source of gelling agents. Histamine occurs at 600 Lo 2500 pg/g dry weight in Furcellaria lumbricalis which is the source of furcellaran. Hordenine occurs at 1000 to 5500 pg/g dry weight in Mastocarpus stellatus, which together with Chondrus crispus is the source of carrageenan. These latter two algae are also used to produce the algal food product Carrageen. However the traditional practice of bleaching Carrageen in the open reduces its hordenine content to a level which is unlikely to be hazardous in humans.
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