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Subcellular Distribution and Mechanism of Detoxifying Arsenic in Porphyra Yezoensis

文献类型： 外文期刊

作者： Shang De-Rong 1 ; Zhang Ji-Hong 1 ; Zhao Yan-Fang 1 ; Zhai Yu-Xiu 1 ; Ning Jin-Song 2 ; Ding Hai-Yan; Sheng Xiao-Fe 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst,Key Lab Testing & E, Key Lab Sustainable Utilizat Marine Fisheries Res, Minist Agr,Natl Ctr Qual Supervis & Test Aquat Pr, Qingdao 266071, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst,Key Lab Testing & E, Key Lab Sustainable Utilizat Marine Fisheries Res, Minist Agr,Natl Ctr Qual Supervis & Test Aquat P

关键词： High performance liquid chromatography-inductively coupled plasma-mass spectrometry;Porphyra yezoensis;arsenite;Arsenate;Subcelluar distribution;Compartmentation

期刊名称：CHINESE JOURNAL OF ANALYTICAL CHEMISTRY （ 影响因子：1.134； 五年影响因子：0.909 ）

ISSN： 0253-3820

年卷期： 2013 年 41 卷 11 期

页码：

收录情况： SCI

摘要： In order to disclose the compartmentation of arsenic and the mechanism of detoxifying arsenic in Porphyra yezoensis, the transformation of different arsenic speciation and the subcellular distribution of arsenic in P. yezoensis were conducted. The seaweed was exposed to different concentrations (0.05, 0.1, 0.5 and 1.0 mg/L) of arsenite (As(III)) and arsenate (As(V)) for 6 days. Samples were randomly collected every day. The arsenic speciation in P. yezoensis was analyzed using HPLC-ICP-MS and the subcellular distribution of arsenic was conducted using differential centrifugation. Results showed that the arsenic accumulated in the seaweed increased with the exposed concentration and exposure time increasing. A clear dose-response was proved to exist in both As(III) and As(V) exposure, and the correlation coefficient was 0.9996 (p < 0.01) and 0.9844 (p < 0.01) for As(III) and As(V) respectively. In addition, the accumulation rate of As(III) was higher than that of As(V), and the accumulation coefficient of arsenic was 4719 and 4112 respectively for the seaweed exposed to 0.1mg/L As(III) and As(V) after 6ds exposure. The results also proved that there was a great difference in the different subcellular distribution and the compartmentation of arsenic in P. yezoensis. The sequcence of different subcellular distribution was cyplasmic supernatant (80%) > cell wall (15%) > cell organelles (5%). Cyplasmic supernatant was the main localization for arsenic and played an important role in the compartmentation of As. At the same time, the research of the arsenic transformation during accumulation showed that the absorbed As(III) in P. yezoensis would be quickly methylated and then be transformed to arsenic sugar (AsX1); the absorbed As(V) in P. yezoensis would be firstly reduced to As(III), which was then be methylated and transformed to arsenic sugar (AsX1). The ability of the compartmention and the transformation of different arsenic speciation in P. yezoensis may play a key role in detoxifying arsenic.

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