ESTIMATION OF DEGREE OF EXTRACTION AND OF PECTIN PROPERTIES FROM BURDOCK ARCTIUM LAPPA L. AT THE EXTRACTION BY AMMONIUM CITRATE
Abstract
The effectiveness of pectin extraction from grassyabovegroundmass of burdock Arctium lappa L. by ammonium citrate1%, hydrochloric acid (1,5%), oxalic acid (0,25%), mixture of 0,5% solutions H2C2O4и (NH4)2C2O4having been compared. Technological advantages of ammonium citrate application as effective extraction agent for isolation of pectin from plant raw materials having been revealed. The high product yield having been noted: the yield of the isolated pectin is comparable to the maximum level for the control systems, reached at the extraction by the hydrochloric acid solution. According to physical and chemical properties the product is close and even surpasses some rates of the analogues extracted by solutions oxalic acid and its mix with ammonium oxalate. Use of ammonium citrate as extraction agent provides reception of a product with the maximum content of uronide at the minimum of ballast compounds mass pert. The size of kinematic viscosity for the 1 % hydrogels of extracted pectin is comparable to result for control organic systems and exceeds the level of the rate for product extracted by hydrochloric acid solution in 1,4 times. Content of free and methoxylic carboxyl groups of the pectin isolated ammonium citrate amount accordingly 6,3 and 5,4%.
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