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Iodine binding capacity and iodine binding energy of glycogen

✍ Scribed by Douglas N. Lecker; Sangeeta Kumari; Arshad Khan

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
120 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

The iodine binding capacity (IBC) of glycogen is around 0.30% (w/w) at 3ЊC. The amount of iodine complexed comprises about 12.5% of the mass of glycogen that takes part in the glycogen-iodine (GI) complex formation. This suggests involvement of four iodine atoms for every 25 anhydroglucose units (AGU, C 6 H 10 O 5 ). Since the chromophore is due to the I 4 unit within the helix of 11 AGUs, only 44% of the AGUs (11 out of 25) are involved in the complex formation. The heat of formation of the GI complex is around 040 kJ/mol of I 2 bonded. These results suggest remarkable similarities with those of the amylopectin-iodine (API) complex.

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