A galactose derivative found in a number of polysaccharides (for example, agarose).
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The 3,6-anhydrogalactose (3,6-AG) content was determined colorimetrically using the resorcinol-acetal method [20] and fructose as the standard sugar in samples extracted in water or KOH solutions (mass ratio algae/ extracting medium 1 : 20) of various concentrations for 4 h.
Improved resorcinol reagent for the determination of fructose and 3,6-anhydrogalactose in polysaccharides.
In the course of this troublesome study series, which involved purely chemical methods, a unique component sugar, 3,6-anhydrogalactose, was discovered [4] and an idealized extreme structure type of agarose (Fig.