Production of Resistant Dextrins

Abstract

A method for producing digestion-resistant dextrin from starch hydrolyzates is disclosed. In one form, the method includes mixing the starch hydrolyzate, dextrose and an acid catalyst which are allowed to react under mild vacuum with heat. The ingredients require no pre-drying and the method requires no external plasticizers.

1 . A method for manufacturing a resistant dextrin composition comprising the steps of:
 combining about 60 to about 80 wt. % dextrose, about 20 to about 40 wt % maltodextrin and a catalytic amount of citric acid to form a mixture having a moisture content of at least about 5%;   reacting the mixture to derivatize the maltodextrin with the dextrose at a temperature range of about 130° C. to about 180° C.; and   removing moisture from the mixture using a vacuum thereby forming a resistant dextrin composition.   
     
     
         2 . A method according to  claim 1 , the vacuum comprising about 5 to about 25 inches of mercury. 
     
     
         3 . The method of  claim 1  wherein the mixture is substantially free of polyols. 
     
     
         4 . The method of claim,  1  further comprising the step of purifying the resistant dextrin composition using activated carbon treatment or ion exchange chromatography. 
     
     
         5 . The method of  claim 1  wherein the mixture includes about 75 wt. % dextrose and about 25 wt % maltodextrin, 
     
     
         6 . The method of  claim 1  wherein the reacting step is at a temperature range of about 140° C. to about 160° C. 
     
     
         7 . The method of  claim 1  wherein the removal of moisture occurs simultaneously with the reaction. 
     
     
         8 . The method of  claim 1  wherein the mixture consists essentially of dextrose, maltodextrin and citric acid. 
     
     
         9 . The method of  claim 1 , wherein the mixture has a moisture content of at least about 10%. 
     
     
         10 . The method of  claim 1 , wherein the dextrin composition has a digestibility ranging from 10-20%. 
     
     
         11 . A method for manufacturing a resistant dextrin composition comprising the steps of:
 combining a mixture consisting essentially of dextrose and maltodextrin and a catalytic amount of citric acid to form a mixture having a moisture content of at least about 5%;   reacting the mixture to derivatize the maltodextrin with the dextrose at a temperature range of about 130° C. to about 180° C.; and   removing moisture from the mixture using a vacuum thereby forming a resistant dextrin composition.   
     
     
         12 . A method according to  claim 11 , said maltodextrin being present in an amount ranging from 20-75% based on the total weight of maltodextrin and dextrose. 
     
     
         13 . A method according to  claim 11 , the mixture being substantially free of polyols. 
     
     
         14 . The method of  claim 11 , wherein the dextrin composition has a digestibility ranging from 10-20%.