reported. In the present work, the stabilities of cycloDOPA and cycloDOPA methyl ester at various pH levels were studied. Both compounds were stable under acidic conditions. By contrast, both compounds were unstable when the pH was shifted from neutral to basic to form indole derivatives as major products. Based on the pH stability, cycloDOPA and its derivatives were subjected to the DPPH radical scavenging
Cyclo
DOPA(白斑多色)是一种众所周知的
酪氨酸代谢产物,它是哺乳动物有机体中
黑色素的前体,也是植物中β-
甘油的前体。然而,尚未广泛报道从自然来源分离出cyclo
DOPA。在目前的工作中,研究了在各种pH
水平下cyclo
DOPA和cyclo
DOPA甲酯的稳定性。两种化合物在酸性条件下均稳定。相反,当pH值从中性变为碱性以形成
吲哚衍
生物作为主要产物时,两种化合物均不稳定。基于pH稳定性,首次对cyclo
DOPA及其衍
生物进行了
DPPH自由基清除测定。