Glucose (chemical formula C6H 12O6) is also called corn glucose and corn sugar, or glucose for short. English alias: glucose, corn sugar, glucose, blood sugar. It is the most widely distributed and important monosaccharide in nature, and it is a polyhydroxy aldehyde. Pure glucose is colorless crystal, sweet but not as sweet as sucrose (most people can't taste sweetness), soluble in water, slightly soluble in ethanol and insoluble in ether. The optical rotation of the aqueous solution is correct, so it belongs to "glucose". 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-supplying substance of organisms. Plants can produce glucose through photosynthesis. It is widely used in candy manufacturing and medicine.