Abstract: The Galacturonic acid residues in Cp-2-B were reduced by Taylor method to be Galactosyl residues using deuteriumindexed reducing reagent NaBD4, and then subjected to methylation treatment and assayed by GC-MS. The results suggested thatthey contained non-reducing terminal, 3-O- and 4-O-substituted galacturonic acid residues, indicating the presence of three kindsof galacturonic acid residues in Cp-2-B. NMR analysis was also supported this conclusion. Additionally, The actions to thecrude pectinase and endopolygalacturonase suggested that Cp-2-B had no consecutive region of (1→4) linkage Galacturonicacid residues.

Key words: Lycium chinense Mill, arabinogalactan-protein(AGP), micro structure