Illustrate the composition of agar, Biology

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Composition of agar

Agar we learnt consists of a mixture of agrose and agropectin.  Agrose has a linear polymer structure  consisting of alternating D-galactose and 3,6-anhydro-L-galactose as shown in figure. Agaropectin is a heterogeneous mixture of smaller molecules that occur in lesser amounts. Their structures are similar but slightly branched and sulfated, and they may have methyl and pyruvic acid ketal substituents

 

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