Degradation of D and L Sugars CHO C02↑ H一C一OH CHO CO2t HO-C-H degrade HO一C一H degrade CHO CO2 H 一OH H一C一OH H-C-OH CHO H-C-OH H-C-OH H-C-OH degrade H-C-OH CH2OH CH2OH CH2OH CH2OH D-(+)-glucose D-(-）-arabinose D-(-)-erythrose D-(+)-glyceraldehyde Copyright2010 Pearson Prentice Hall,Inc. Fischer-Rosanoff Convention D sugars can be degraded to the dextrorotatory (+ form of glyceraldehyde L sugars can be degraded to the levorotatory (-)form of glyceraldehyde. Chapter 23 6Chapter 23 6 Degradation of D and L Sugars ▪ Fischer–Rosanoff Convention ▪ D sugars can be degraded to the dextrorotatory (+) form of glyceraldehyde. ▪ L sugars can be degraded to the levorotatory (-) form of glyceraldehyde