摘要：N -Alkylamides of highly methylated (HM) citrus pectin (DM = 73%) were prepared using heterogeneous amino-de-alkoxylation (aminolysis) with five selected n -alkylamines. The reaction was carried out in N , N -dimethylformamide at 8°C ( n -butylamine), 25°C ( n -hexylamine), and 45°C ( n -octylamine, n -dodecylamine and n -octadecylamine). All the derivatives were converted into acid forms by washing with acidic water-ethanol mixture. The products were analysed by organic elemental analysis, diffusion reflection FT-IR spectroscopy and by 13C CP/MAS NMR. Both FT-IR and NMR spectra indicate the presence of alkylamide substituents bound to pectin. The degrees of amidation ( DA ) of the derivatives and molar and mass reaction yields ( Y m and Y n ) were calculated based on the results of elemental analysis. The DA values of the N-alkylamides were 39–55% that corresponded to Y n of 54–75%.
关键词：HM citrus pectin; amino-de alkoxylation (aminolysis); N -alkylpectinamides
