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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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D(-)-Fructose (D-levulose, fruit sugar) [57-48-7] C6H12O6, M 180.2, m 103°, 103-106°, 119-122°(dec), d25 1.694g/cm3, [α]54620 -190 (after 1 hour, c 10, H2O), pK25 12.03. Dissolve D(-)-fructose in an equal weight of water, add charcoal (previously washed with water to remove any soluble material), filter and evaporate under reduced pressure at 45-50° to give a syrup containing 90% of fructose. After cooling to 40°, the syrup is seeded and kept at this temperature for 20-30 hours with occasional stirring. The crystals are removed by centrifugation, washed with a small quantity of water and dried to constant weight under a vacuum over concentrated H2SO4. For higher purity, this material is recrystallised from 50% aqueous ethanol [Tsuzuki et al. ...

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