The order of substrate specificity of the enzyme glutathione dehydrogenase (GSH-DH)towards the four DHAsc stereo isomers corresponds with that observed for the improver action of dough.

• 谷胱甘肽脱氢酶(GSH--dh)对四种脱氢抗坏血酸立体异构体的底物特异性顺序同观察到的面团的改良剂作用相符合。