Chlorophyll catalyse the photo-transformation of carcinogenic benzo[a]pyrene in water.
Chlorophyll catalyse the photo-transformation of carcinogenic benzo[a]pyrene in water.
复制标题
叶绿素催化水中致癌苯并[a]芘的光转化
DOI：
10.1038/srep12776
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发表时间：
2015-08-04
影响因子：
4.6
通讯作者：
Luan T
中科院分区：
文献类型：
--
作者：
Luo L;Lai X;Chen B;Lin L;Fang L;Tam NF;Luan T
藻华对水质和水产养殖造成了极大的危害。然而，本研究表明，死藻细胞和叶绿素可以加速苯并[a]芘（BaP）在可见光照射下的光转化，苯并[a]芘是一种普遍存在的具有强致突变和致癌毒性的持久性污染物。叶绿素是死藻细胞的主要活性物质，产生高水平的单线态氧，催化BaP的光转化。根据形成的各种BaP代谢产物，提出了死藻细胞中的叶绿素通过光催化生成单线态氧将BaP氧化为醌类的降解机制。研究结果为叶绿素在有机污染物光转化中的作用提供了新的思路，为自然环境中有机污染物的修复提供了一种可能的策略。
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.