METHOD FOR OBTAINING HEPTAGALACTURONIDE Russian patent published in 2015 - IPC C08B37/06 

FIELD: chemistry.

SUBSTANCE: method of heptagalacturonide obtaining includes acid pectin hydrolysis with the following separation of liquid phase from insoluble pectin residue and extraction of heptagalacturonide from it. As pectin applied is low-etherified pectin with degree of etherification not higher than 30%. Acid hydrolysis is carried out in 0.1-2.0 mole/l in solution of mineral acid at temperature 70-100°C until concentration of oligogalacturonide in each phase not less than 0.25 mg/ml is achieved. To separate heptagalacturonide from liquid phase it is neutralised to pH not lower than 4.0. Then ethanol is added with constant mixing to concentration 12-19 vol %, precipitated sediment is removed, and ethanol is added to liquid phase with constant mixing to concentration 21-28 vol %. After that heptagalacturonide sediment is separated from liquid phase and dried. To obtain product of higher purity before drying sediment of heptagalacturonide is washed with solution, which contains 0.1-0.5 mole/l of sodium chloride and 21-28 vol % of ethanol, and then washed with 70-85 vol % of ethanol solution.

EFFECT: invention makes it possible to separate heptagalacturonide with high degree of purity from pectin.

2 cl, 8 ex