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Physical properties of periodate-oxidized amylose: Aggregation of oxidized amylose in aqueous solutions

✍ Scribed by Stig R. Erlander; H. L. Griffin; F. R. Senti

Publisher
Wiley (John Wiley & Sons)
Year
1965
Tongue
English
Weight
684 KB
Volume
3
Category
Article
ISSN
0006-3525

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✦ Synopsis

Tlie ability of periodate-oxidized amylose to form aggregates in aqueous solution was studied by sedimentation, light scattering, and viscosity analyses. Ultracentrifuge schlieren patterns show that aggregation can be appreciable at pH 3.0 and 1.0. The hydroxyl ion-catalyzed degradation of the oxidized amylose is faster a t pH 3.0 than a t pH 1.0. Viscosity and sedimentation analyses conducted at pH 3.0 show that a minimum in the degree of aggregation of the oxidized molecules is obtained at 15-25% oxidation. Solubility studies and x-ray diffraction patterns on retrograded amylose show that maximum solubility of the retrograded amylose is obtained by oxidizing to the extent of 25-35%. It was therefore concluded that in the general range of 20-30% periodate oxidation, the oxidized amylose has a minimum ability to form intermolecular hydrogen bonds. Outside of this range, oxidized amylose readily forms aggregates in aqueous solutions.

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