irradiation of thymidine solution in the presence of salicylic acid resulted in four major product peaks in HPLC. All the products were identified as isomers of cyclobutane thymidine dimers by MS and NMR. The cyclobutane thymidine dimers were generated from thymidine almost exclusively. UV irradiation with the longer wavelength of 350 nm induced almost no reaction. The results indicate that salicylic acid is
当用波长大于300nm的紫外光照射核苷混合物的中性溶液时,向该溶液中添加
水杨酸极大地促进了
胸苷的反应。在
水杨酸存在下,
胸苷溶液的紫外线照射导致HPLC中出现四个主要产物峰。通过MS和NMR将所有产物鉴定为
环丁烷胸苷二聚体的异构体。
环丁烷胸苷二聚体几乎完全由胸腺
嘧啶生成。350 nm较长波长的紫外线照射几乎不会引起反应。结果表明,
水杨酸是由波长为300至350 nm的紫外线激发的
胸苷二聚化的光敏剂。