Abstract: The disclosure discloses a method for chemically synthesizing a Helicobacter pylori core lipopolysaccharide oligosaccharide antigen carbohydrate chain, and belongs to the technical field of carbohydrate chemistry. The disclosure uses D-glucose, D-galactose and D-mannose as starting materials, which undergo a series of protection and deprotection reactions to prepare eight monosaccharide blocks. The eight monosaccharide block compounds as shown in formulas 2 to 9 undergo glycosylation reactions under catalysis of corresponding activating reagents, to prepare H. pylori lipopolysaccharide core oligosaccharide antigen fragments as shown in formula 1. The disclosure further combines the synthesized oligosaccharide fragments with a chip to make a carbohydrate chip, screens the optimal antigen fragments using patient serum, or combines the synthesized oligosaccharide fragments with carrier proteins to make glycoconjugates.

Abstract: The disclosure discloses a preparation method of outer core octasaccharide of Helicobacter pylori lipopolysaccharide, and belongs to the field of carbohydrate chemistry. The structure of the outer core octasaccharide of Helicobacter pylori is (?-D-Glc-(1-3)-?-D-Glc-(1-4)-?-D-Gal-(1-7)-D-?-D-Hep[?-D-Glc-(1-6)-?-D-Glc-(1-6)-?-D-Glc-(1-2)-D-?-D-Hep]-Linker. The structure consists of three monosaccharides: glucose, galactose and heptose. It contains five ?-glycosidic bonds of glucose, one ?-glycosidic bond of galactose and two ?-glycosidic bonds of heptose. The disclosure prepares the octasaccharide by the synergistic action of remote neighboring group participation effect, solvent effect, temperature effect, additives and leaving groups. The reducing end of the octasaccharide may also be linked with a linker for future attachment to the protein to form a glycoconjugate for immunological studies.

Abstract: The disclosure discloses a preparation method of outer core octasaccharide of Helicobacter pylori lipopolysaccharide, and belongs to the field of carbohydrate chemistry. The structure of the outer core octasaccharide of Helicobacter pylori is (?-D-Glc-(1-3)-?-D-Glc-(1-4)-?-D-Gal-(1-7)-D-?-D-Hep[?-D-Glc-(1-6)-?-D-Glc-(1-6)-?-D-Glc-(1-2)-D-?-D-Hep]-Linker. The structure consists of three monosaccharides: glucose, galactose and heptose. It contains five ?-glycosidic bonds of glucose, one ?-glycosidic bond of galactose and two ?-glycosidic bonds of heptose. The disclosure prepares the octasaccharide by the synergistic action of remote neighboring group participation effect, solvent effect, temperature effect, additives and leaving groups. The reducing end of the octasaccharide may also be linked with a linker for future attachment to the protein to form a glycoconjugate for immunological studies.