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Kappa-Carrageenan is a gelling sulfated galactan extracted from red seaweed (typically Gigartina stellata and Chondrus Crispus). The structure of all carrageenans consists of a strictly alternating masked repeating unit of (1-3) linked α-D-galactose and (1-4) linked β-D-galactose. The α-linked galactose occurs as a 3,6-anhydro unit and the β-linked sugar occurs as the 3-sulfate.