Mannose (mannose) is a monosaccharide, is also a six carbon sugar. Carbohydrate metabolism process, because the role of hexokinase, the phosphorylation of the formation of mannose 6 - phosphate. Mannose 
 A single sugar. The formula C5H11O5CHO. For a variety of polysaccharide composition. Exist in the free state in the peel of certain plants, such as orange peel, peach, apple and other fruit, a small amount of free mannose, ivory palm child, yeast, red algae, serum globulin, ovomucoid, and Mycobacterium tuberculosis containing D-mannose glycans. Mannose as a white crystal or crystalline powder, sweet and bitter. +29.3 ° (water); beta-melting point 132 ° C (decomposition), -17 ° → +14.6 ° (water). Soluble in water, slightly soluble in ethanol. D-mannose and calcium chloride is easy to form a crystalline compound, C6H12O6 CaCl2 · 4H2O, and complex changes in the optical rotation role. D-mannose can be fermented by yeast. D-mannose can be rich in D-mannose glycans (ivory palm child, yeast mannan, etc.) hydrolysis. But also by D-mannitol (kelp system iodine industry by-products) in the presence of ferrous ions used oxidation with hydrogen peroxide synthesis. By D-glucose difference to the isomerization, or growth of the carbon chain prepared from D-arabinose.