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Physical properties of periodate‐oxidized amylose: Aggregation of oxidized amylose in aqueous solutions
Author(s) -
Erlander Stig R.,
Griffin H. L.,
Senti F. R.
Publication year - 1965
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1965.360030411
Subject(s) - periodate , amylose , chemistry , aqueous solution , oxidizing agent , intermolecular force , viscosity , solubility , molecule , organic chemistry , starch , physics , quantum mechanics
The 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 at pH 3.0 than at 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. Solubulity 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.