alginates

pl. n.

derivatives of alginic acid, a complex carbohydrate extracted from certain brown seaweeds, that readily absorb water to form a gel. Alginates are included in many antacid preparations (e.g. Gastrocote, Gaviscon) for the relief of heartburn caused by gastro-oesophageal reflux because they form a layer on the stomach contents that protects the oesophagus from acid reflux. As they are hightly absorbent, alginates are also used in dressings for exuding wounds.