Raffinose (Standard) is the standard substance of Raffinose, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Raffinose (Melitriose) is an indigestible short-chain oligosaccharide, a trisaccharide composed of galactose, glucose and fructose, found in many plants. It can be hydrolyzed by α-galactosidase (α-GAL) to D-galactose and sucrose.