Glucan fibre

Patent metadata

Field	Value
Publication number	US-9481739-B2
Application number	US-201314398251-A
Country	US
Kind code	B2
Filing date	May 21, 2013
Priority date	May 21, 2012
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

Method for preparing a branched glucan having a chain comprising a plurality of glucose units linked by alpha 1,4-glycoside bonds and a plurality of side-groups linked to said chain via another type of glycoside bonding, which side-groups comprise one or more glucose units, the method comprising contacting a glucose source with a polysaccharide—which polysaccharide is a glucan comprising a plurality of glucose units linked by alpha 1,4-glycoside bonds and is essentially linear or branched to a lesser extent than the branched glucan that is to be prepared—in the presence of an acid catalyst under polycondensation conditions, thereby forming the branched glucan.

First claim

The invention claimed is:

1. Method for preparing a branched glucan having a chain comprising a plurality of glucose units linked by alpha 1,4-glycoside bonds and a plurality of side-groups linked to said chain via another type of glycoside bonding, which side-groups comprise one or more glucose units, the method comprising
providing a melt comprising a glucose source selected from the group consisting of glucose, maltose and polydextrose with a polysaccharide
wherein said polysaccharide
is a glucan comprising a plurality of glucose units linked by alpha 1,4-glycoside bonds, which glucan is essentially linear or branched to a lesser extent than the branched glucan that is to be prepared,
has a number average degree of polymerisation of at least 10, and
has been gelatinized prior to providing the melt,

wherein the weight to weight ratio of the total of said glucose source to said polysaccharide in the melt being in the range of 30:70 to 99:1, and

contacting said glucose source and said polysaccharide in the melt in the presence of an acid catalyst under polycondensation conditions, thereby forming the branched glucan.

2. Method according to claim 1 , wherein the contacting takes place at a temperature in the range of 100 to 250° C.

3. Method according to claim 1 , wherein the contacting takes place in the presence of water.

4. Method according to claim 1 , wherein said polysaccharide that is contacted is selected from the group consisting of starches and maltodextrins.

5. Method according to claim 1 , wherein the contacting takes place in a mixture in which initially the weight to weight ratio of the total of said glucose source to said polysaccharide is in the range of 30:70 to 99:1, said components together forming at least 70 wt. % of the mixture.

6. Method according to claim 1 , wherein the contacting takes place under a sub-atmospheric pressure.

7. Method according to claim 1 , wherein at least a part of the side-groups are linked to the chain via a 1,6 glycoside bond, a 1,2 glycoside bond or a 1,3 glycoside bond.

8. Method according to claim 1 , wherein said polysaccharide contacted with the glucose source has a number average degree of polymerisation in the range of 10-500 000.

9. Method according to claim 8 , wherein said polysaccharide has a number average degree of polymerisation in the range of 100 to 100 000.

10. Method according to claim 9 , wherein said polysaccharide has a number average degree of polymerisation in the range of 250 to 25 000.

11. Method according to claim 1 , wherein the glucose source is glucose, maltose or a mixture thereof.

12. Method according to claim 1 , wherein the glucose source is glucose.

13. Method according to claim 5 , wherein in the mixture initially the weight to weight ratio of the total of said glucose source to said polysaccharide is in the range of 50:50 to 80:20, said components together forming at least at least 90 wt. % of the mixture.

14. Method according to claim 6 , wherein the contacting under polycondensation conditions takes place at a pressure below the partial water vapour pressure of less than 0.5 bar.

15. Method according to claim 1 , wherein said glucose source, said polysaccharide and said catalyst are intimately mixed at a relatively high water content to form a melt and thereafter water content is reduced.

16. Method according to claim 3 , wherein the contacting under polycondensation conditions is carried out in a reaction system from which water is removed by allowing the water to evaporate and remove the water from the reaction system.

17. Method according to claim 1 , wherein the contacting under polycondensation conditions takes place for a duration in the range of more than 1 min to less than 12 hours.

18. Method according to claim 4 , wherein the polysaccharide is a starch from a tuber or root.

19. Method according to claim 18 , wherein the polysaccharide is a starch from potato.

Assignees

• Nederlandse Organisatie Voor Toegepast—Natuurwetenschappelijk Onderzoek Tno
• Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno

Inventors

• Essers Maurice Karel Hubertina
• Timmermans Johannes Wilhelmus
• Diaz Jerome Villarama
• Van Den Dool Ronald Tako Marinus
• Slaghek Theodoor Maximiliaan

Classifications

• A23L29/35

  Degradation products of starch, e.g. hydrolysates, dextrins; Enzymatically modified starches · CPC title

• A23V2002/00

  Food compositions, function of food ingredients or processes for food or foodstuffs · CPC title

• A23V2200/00

  Function of food ingredients · CPC title

• A23L33/21

  Addition of substantially indigestible substances, e.g. dietary fibres · CPC title

• A23L33/26

  Polyol polyesters, e.g. sucrose polyesters; Synthetic sugar polymers, e.g. polydextrose · CPC title