Uronic acid, which is a constituent sugar of alginic acid, has one carboxyl group per unit with a high ion exchange property. Binding with various cations generates unique alginate salts.
Calcium alginate is a salt in which calcium ions are bonded to the carboxyl group of alginic acid. Calcium ion, because it is a divalent cation, links (ion bridges) between two carboxyl groups. As a result, calcium alginate, unlike other alginates, is insoluble in water.
Calcium alginate itself is not often used in foods. However, when sodium alginate is used as a gelling agent, the gel formed by the addition of a calcium salt contains calcium alginate.
Therefore, in foods using the gelling ability of alginic acid, such as artificial salmon roe and onion rings, calcium alginate is indirectly used.
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