Fructose is a six carbon monosaccharide. It is a reducing sugar. Since it contains a keto group, it is called a ketohexose. Fructose is so named because it was first identified from fruit. Sugarcane, beets, ripe fruits, nectar and honey contain high amounts of fructose. Ripe fruits contain a lot of fructose, so it is called fruit sugar or levulose. Its relative sweetness is 173. Fructose is the largest source of fructose in plants. Augustin Pierre Dubrunfaut discovered it in 1847. 2,40,000 tons of fructose are produced in the world every year. Dr. Siddiq Publications