POLYSACCHARIDES FOR VISCOSITY MODIFICATION
First Claim
1. A composition comprising poly alpha-1,3-1,6-glucan, wherein(i) at least 30% of the glycosidic linkages of said glucan are alpha-1,3 linkages,(ii) at least 30% of the glycosidic linkages of said glucan are alpha-1,6 linkages,(iii) said glucan has a weight average degree of polymerization (DPw) of at least 1000;
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Abstract
Compositions are disclosed herein comprising poly alpha-1,3-1,6-glucan with a weight average degree of polymerization (DPw) of at least 1000. This glucan polymer comprises at least 30% alpha-1,3 linkages and at least 30% alpha-1,6 linkages. Further disclosed are glucosyltransferase enzymes that synthesize poly alpha-1,3-1,6-glucan. Ether derivatives of poly alpha-1,3-1,6-glucan and methods of using such derivatives as viscosity modifiers are also disclosed.
59 Citations
16 Claims
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1. A composition comprising poly alpha-1,3-1,6-glucan, wherein
(i) at least 30% of the glycosidic linkages of said glucan are alpha-1,3 linkages, (ii) at least 30% of the glycosidic linkages of said glucan are alpha-1,6 linkages, (iii) said glucan has a weight average degree of polymerization (DPw) of at least 1000; - and
(iv) the alpha-1,3 linkages and alpha-1,6 linkages of said glucan do not consecutively alternate with each other. - View Dependent Claims (2, 3, 4)
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5. A composition comprising a poly alpha-1,3-1,6-glucan ether compound, wherein:
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(i) at least 30% of the glycosidic linkages of said compound are alpha-1,3 linkages, (ii) at least 30% of the glycosidic linkages of said compound are alpha-1,6 linkages, (iii) said compound has a weight average degree of polymerization (DPw) of at least 1000, (iv) the alpha-1,3 linkages and alpha-1,6 linkages of said compound do not consecutively alternate with each other, and (v) the compound has a degree of substitution (DoS) with at least one organic group of about 0.05 to about 3.0. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method of producing a poly alpha-1,3-1,6-glucan ether compound, the method comprising:
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(a) contacting poly alpha-1,3-1,6-glucan in a reaction under alkaline conditions with at least one etherification agent comprising an organic group, wherein at least one organic group is etherified to the poly alpha-1,3-1,6-glucan thereby producing a poly alpha-1,3-1,6-glucan ether compound, wherein (i) at least 30% of the glycosidic linkages of said poly alpha-1,3-1,6-glucan are alpha-1,3 linkages, (ii) at least 30% of the glycosidic linkages of said poly alpha-1,3-1,6-glucan are alpha-1,6 linkages, (iii) said poly alpha-1,3-1,6-glucan has a weight average degree of polymerization (DPw) of at least 1000, (iv) the alpha-1,3 linkages and alpha-1,6 linkages of said poly alpha-1,3-1,6-glucan do not consecutively alternate with each other, and (v) the compound has a degree of substitution (DoS) with at least one organic group of about 0.05 to about 3.0; and (b) optionally, isolating the poly alpha-1,3-1,6-glucan ether compound produced in step (a). - View Dependent Claims (14)
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15. A method for increasing the viscosity of an aqueous composition, the method comprising:
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contacting a poly alpha-1,3-1,6-glucan ether compound with the aqueous composition, wherein the viscosity of the aqueous composition is increased by said compound, wherein (i) at least 30% of the glycosidic linkages of said compound are alpha-1,3 linkages, (ii) at least 30% of the glycosidic linkages of said compound are alpha-1,6 linkages, (iii) said compound has a weight average degree of polymerization (DPw) of at least 1000, (iv) the alpha-1,3 linkages and alpha-1,6 linkages of said compound do not consecutively alternate with each other, and (v) the compound has a degree of substitution (DoS) with at least one organic group of about 0.05 to about 3.0.
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16. A method of treating a material, said method comprising:
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contacting a material with an aqueous composition comprising a poly alpha-1,3-1,6-glucan ether compound, wherein; (i) at least 30% of the glycosidic linkages of said compound are alpha-1,3 linkages, (ii) at least 30% of the glycosidic linkages of said compound are alpha-1,6 linkages, (iii) said compound has a weight average degree of polymerization (DPw) of at least 1000, (iv) the alpha-1,3 linkages and alpha-1,6 linkages of said compound do not consecutively alternate with each other, and (v) the compound has a degree of substitution (DoS) with at least one organic group of about 0.05 to about 3.0.
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Specification