Sucrose. (also saccharose), one of the most important disac-charides. Sucrose, which is present in all photosynthesizing plants, forms colorless crystals that dissolve readily in water and melt at 185°–186°C. It is easily hydrolyzed to yield glucose and fructose by the action of acids or the enzyme invertase.ucrose. (organic chemistry). C 12 H 22 O 11 Combustible, white crystals soluble in water, decomposes at 160 to 186°C; derived from sugarcane or sugarbeet; used as a sweetener in drinks and foods and to make syrups, preserves, and jams. Also known as saccharose; table sugar.