Solvent and process for obtaining undepolymerized amyloses

Claim 1

A PROCESS FOR OBTAINING UNDEPOLYMERIZED AMYLOSES THAT ARE CHARACTERIZED BY GREATLY IMPROVED MOLECULAR WEIGHTS COMPRISING: (A) THOROUGHLY HYDRATING AN AMYLOSE-CONTAINING MATERIAL SELECTED FROM THE GROUP CONSISTING OF AMYLOMAIZE STARCH, POTATO STARCH, DENT CORN STARCH, AND CORN MEAL; (B) ADDING THERETO AN AMOUNT OF AN AQUEOUS SOLVENT MIXTURE CONTAINING PER LITER 5 MOLES OF LITHIUM THIOCYANATE AND ABOUT 2.5 MOLES OF GUANIDINIUM THIOCYANATE TO PROVIDE A DISPERSION CONTAINING BETWEEN ABOUT 10 PERCENT AND ABOUT 15 PERCENT (DRY BASIS) OF SAID AMYLOSE-CONTAINING MATERIAL; (C) ADJUSTING THE PH TO 7.0; (D) STIRRING AT ROOM TEMPERATURE FOR ABOUT 3 HOURS TO COMPLETELY DISSOLVE SAID MATERIAL; (E) ADDING ABSOLUTE ETHANOL TO PROVIDE A 23 PERCENT BY WEIGHT CONCENTRATION THEREOF; (F) WARMING TO ABOUT 45*C. TO PROVIDE A HOMOGENOUS DISPERSION; (G) ALLOWING WARMED SOLUTION TO COOL AT ROOM TEMPERATURE; (H) CENTRIFUGING AT ABOUT 39,000XGRAVITY; (I) DISSOLVING THE PRECIPITATE IN WATER AND REPRECIPITATING WITH EXCESS 95 PERCENT ETHANOL; (J) SUBJECTING THE PRECIPITATE TO COMPLEX FORMATION AT 45*C. WITH MIXED AMYL ALCOHOLS AND SLOWLY COOLING WITH STIRRING TO OBTAIN THE PURE UNDEPOLYMERIZED AMYLOSE.