During the formation of radical A (2) and its precursor (tris (2-deoxy-2-L-ascorbyl) amine, 1) by the reaction of dehydroascorbic acid (DHA) with amino acid, ascorbic acid (AsA) and the reduced red pigment (3) were newly identified, in addition to scorbamic acid (SCA) and the red pigment (4), as intermediate products. The addition of AsA to the DHA-amino acid reaction, as well as to the DHA-SCA reaction, greatly increased the formation of 3 and 1. The reaction of AsA with 4 gave rapidly 3, followed by the gradual production of 1. From these results, a reaction pathway is proposed that 3 formed by the reduction of 4 with AsA is a key intermediate and its condensation with DHA followed by reduction with AsA might produce 2 and 1.
在
脱氢抗坏血酸(
DHA)与
氨基酸反应生成自由基 A(2)及其前体(三(2-脱氧-2-L-
抗坏血酸)胺,1)的过程中,新发现了
抗坏血酸(AsA)和还原红色素(3),以及作为中间产物的
氨基甲酸(SCA)和红色素(4)。在
DHA 与
氨基酸的反应以及
DHA 与 SCA 的反应中加入 AsA 可大大增加 3 和 1 的生成。