SpectroPHotometric method of methoxylation degree determination of polyuronide compounds of linen fiber
The differential estimation of chemical condition of carboxyl groups in pectin of linen fibre has been carried out by the IR-spectroscopy methods on the base of measurements of intensity of ionized carboxyl band ν (СОО−)=1615 см−1. The method application provides series of operations with polymeric pectin films for consecutive chemical transformation of free galacturonic acid residue and its methoxylated units to the calcium pectate. The content of appropriate forms for monomeric residues in pectin extracted from Kaluga flax was: methoxylated units − 61.1 %, unetherized units − 19.4 %, pectinate units − 19.5 %.