METHOD OF OBTAINING PECTINE FROM LARCH BARK HAVING MEMBRANE STABILISING ACTIVITY AND CAPACITY TO REDUCE SILVER IONS OF SILVER NANOBIOCOMPOSITE STABILISED WITH PECTINE Russian patent published in 2010 - IPC C08B37/06 B82B1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of obtaining pectine polysaccharides from waste wood and can be used in food, pharmaceutical, chemical and other industries. Siberian larch bark (Larix sibirica Ledeb.) and/or Dahurian larch bark (Gmelin) (Larix gmelinii Rupr. (Rupr.)) is prepared for complete extraction of pectine polysaccharides through successive treatment with acetylacetate, water and a solution of oxalic acid.The bark residue is then extracted with an ammonium oxalate solution at 60-70°C for 3-5 hours and then concentrated. The end product is then dropped into 96% ethanol and lyophilically dried.

EFFECT: disclosed method provides high output of up to 12% of pectine polysaccharides from larch bark, having membrane stabilising activity and capable of reducing silver ions from salt solutions to nanosize particles with zero valence, where during the reaction a nanobiocomposite is formed from silver nanoparticles with particle size of 3-27 nm, which are stabilised with an amorphous matrix - pectine.

4 cl, 2 dwg, 1 tbl, 6 ex