Agar from Gelidium cartilaginium has been analyzed for D-galactose, 3,6-anhydro-L-galactose, and sulphate. From these analyses and a study of the products of mercaptolysis it is suggested that agar from this source be represented as a chain of alternating D-galactose and 3,6-anhydro-L-galactose residues with a half-ester sulphate on about every 10th galactose unit.
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O'Neill et al. (1956) studied this question.
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