high-performance liquid chromatography on two asahipak gs-320 hydrophilic gel columns ( 50 x 0.76 cm i.d . ) , connected in series , with 0.015 m tartrate buffer ( ph 3.0 ) , containing 2 mm ethylenediaminetetraacetate and 0.05 % beta-thiodiglycol as eluent allowed the separation of glucose , diketogulonic acid + diketogluconic acid , dehydroisoascorbic acid , dehydroascorbic acid , ascorbic acid , and isoascorbic acid within 55 min .
C0011177
dehydroascorbic acid
C0003968
ascorbic acid