Also, the proportions of di- and trisaccharides can be quantified. The three monosaccharide units obtained by hydrolysis that is also trisaccharides. Two, three, several or many monosaccharides thus linked form disaccharides, trisaccharides, oligosaccharides, or polysaccharides, respectively. Often sucrose or other di-, trisaccharides are added to glycerol solution. Trisaccharides are oligosaccharides composed of three monosaccharides with two glycosidic bonds connecting them.