Luo Lijuan, Lai Xueying, Chen Baowei, Lin Li, Fang Ling, Tam Nora F Y, Luan Tiangang
MOE Key Laboratory of Aquatic Product Safety, South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, School of Life Sciences/School of Marine Science, Sun Yat-sen University, Guangzhou 510275, China.
Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou 510275, China.
Sci Rep. 2015 Aug 4;5:12776. doi: 10.1038/srep12776.
Algal blooms cause great damage to water quality and aquaculture. However, this study showed that dead algal cells and chlorophyll could accelerate the photo-transformation of benzo[a]pyrene (BaP), a ubiquitous and persistent pollutant with potently mutagenic and carcinogenic toxicities, under visible light irradiation. Chlorophyll was found to be the major active substance in dead algal cells, and generated a high level of singlet oxygen to catalyse the photo-transformation of BaP. According to various BaP metabolites formed, the degradation mechanism was proposed as that chlorophyll in dead algal cells photo-oxidized BaP to quinones via photocatalytic generation of singlet oxygen. The results provided a good insight into the role of chlorophyll in the photo-transformation of organic contaminants and could be a possible remediation strategy of organic pollutants in natural environment.
藻华对水质和水产养殖造成了极大的破坏。然而，本研究表明，在可见光照射下，死藻细胞和叶绿素能够加速苯并[a]芘（BaP）的光转化，苯并[a]芘是一种普遍存在且持久的污染物，具有强大的诱变和致癌毒性。研究发现叶绿素是死藻细胞中的主要活性物质，它能产生高水平的单线态氧来催化BaP的光转化。根据形成的各种BaP代谢产物，提出了降解机制，即死藻细胞中的叶绿素通过光催化产生单线态氧将BaP光氧化为醌类。这些结果为深入了解叶绿素在有机污染物光转化中的作用提供了很好的见解，并且可能成为自然环境中有机污染物的一种修复策略。
