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US 11,634,561 B2Granted
Water-soluble, high-molecular-weight chitosan powders
AssigneeBoard of Supervisors of Louisiana State University and Agricultural and Mechanical College
InventorsWitoon Prinyawiwatkul, Zhimin Xu, Yixiao Shen
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Abstract
The poor water solubility of high molecular weight chitosan has limited its use in areas such as food and beverage products, post-harvest treatments, cosmetic and pharmaceutical products, medical treatments, and environmental pollution treatments. Disclosed is a high-molecular-weight, solid-state chitosan powder that is completely water-soluble.
Claims19
A solid-state salt of a chitosan and an acidic amino acid;
- wherein:
- (a) said chitosan has an average molecular weight at least 70 kDa;
- (b) said acidic amino acid comprises aspartic acid, glutamic acid, or both;
- (c) the mass of said acidic amino acid is at least 0.7 times the mass of said chitosan;
- and
- (d) said salt is a solid-state salt, that has the ability to completely dissolve in water at 25° C. to yield an aqueous solution comprising at least 1% chitosan by mass;
- wherein:
- (e) said solid-state salt is essentially free of mineral acid;
- (f) wherein said solid-state salt is essentially free of acetic acid, and said solid-state salt is essentially free of acetate salts;
- (g) said solid-state salt is essentially free of surfactant;
- and
- (h) said solid-state salt is not a coating on an agricultural product.
9 more elements
Dependencies are inferred from the claim text.