Oligosaccharide composition refers to a method of studying the chemical structure and biological function of oligosaccharides by analyzing and disassembling the individual monosaccharide (simple sugar) components contained in oligosaccharide molecules. Oligosaccharides are usually composed of 2 to 1 monosaccharide units connected by glycosidic bonds. They play important roles in organisms, such as cell recognition, immune response, signal transduction, etc.