Glucose (glucose), organic compound, molecular formula C6H12O6. It is the most widely distributed and most important monosaccharide in nature. It is a polyhydroxyaldehyde. Pure glucose is colorless crystal, with sweet taste but not as sweet as sugar (ordinary people can't taste sweet taste), easy to dissolve in water, slightly soluble in ethanol, insoluble in ether. Natural glucose solution rotatory to the right, so it belongs to dextrose. Glucose plays an important role in biology. It is the energy source of living cells and the intermediate product of metabolism, that is, the main energy supply material of living things. Plants can produce glucose by photosynthesis. It is widely used in confectionery manufacturing and medicine.