Most common monosaccharide. Commercially from starch. Cereal roots, legumes, animal tissue, and liver. Mutarotation - The optical changes of glucose in water solution to constant value a20 D = +520 a - D - glucose -> D - glucose <- b - D - glucose a20 D = 113 a20 D = 52 a20 D = = 19 At equilibrium = 35% of a - form and 65% of b - form. Glucose (dextrose)Most common monosaccharide. Commercially from starch. Cereal roots, legumes, animal tissue, and liver. Mutarotation - The optical changes of glucose in water solution to constant value a20 D = +520 a - D - glucose -> D - glucose <- b - D - glucose a20 D = 113 a20 D = 52 a20 D = = 19 At equilibrium = 35% of a - form and 65% of b - form. Glucose (dextrose)