作者:Mariana Vignoni、Franco M. Cabrerizo、Carolina Lorente、Andrés H. Thomas
DOI:10.1111/j.1751-1097.2008.00450.x
日期:2009.1
New photochemical studies of the reactivity of biopterin (BPT) and neopterin (NPT) in acidic (pH = 5.5) and alkaline (pH = 10.5) aqueous solutions at 350 nm and room temperature were performed. The photochemical properties of BPT are of particular interest because the photolysis of this compound takes place in the white skin patches of patients affected by vitiligo. The photochemical reactions were
在350 nm和室温下,对新蝶呤(BPT)和新蝶呤(NPT)在酸性(pH = 5.5)和碱性(pH = 10.5)水溶液中的反应性进行了新的光化学研究。BPT的光化学性质特别受关注,因为该化合物的光解发生在受白癜风影响的患者的白色皮肤斑块中。进行光化学反应,然后进行UV / VIS分光光度法,HPLC,溶解的O(2)的电化学测量以及过氧化氢(H(2)O(2))和超氧阴离子(O(2)(-))测定的酶促方法。当BPT或NPT暴露于UVA辐射时,在不依赖O(2)的过程中会生成红色中间体,很可能是6-甲酰基-5,8-二氢蝶呤。该产物在O(2)进入后迅速氧化,生成6-甲酰基蝶呤和H(2)O(2)。当光解发生在有氧条件下时,不存在其他途径。另一方面,在没有O(2)的情况下,生成的中间体不稳定,并导致形成许多产物。在BPT和NPT的光氧化过程中也会生成O(2)(-)。反应物消耗的量子产率取决于O(2)浓