Abstract
Abscisic acid (ABA) has been isolated from commercial preparations and freeze-dried samples of the brown algae Ascophyllum nodosum. Purification by established methods yielded 0.03–0.15 μg ABA/g dry weight in lyophilize powders and 0.10–0.46 μg ABA/g dry wt in a commercial extract. These values are similar to those reported for higher plants. The presence of abscisic acid was confirmed by mass spectroscopy, providing an unambiguous identification of ABA in extracts of macroalgae.
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