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铜绿微囊藻分解过程中七肽毒素(微囊藻毒素)的释放

Release of heptapeptide toxin (microcystin) during the decomposition process of Microcystis aeruginosa.

作者信息

Watanabe M F, Tsuji K, Watanabe Y, Harada K, Suzuki M

机构信息

Tokyo Metropolitan Research Laboratory of Public Health, Japan.

出版信息

Nat Toxins. 1992;1(1):48-53. doi: 10.1002/nt.2620010110.

Abstract

The decomposition process of toxic blue-green alga (cyanobacteria), Microcystis aeruginosa, under dark and aerobic condition was investigated in relation to the change of the amounts of heptapeptide toxins (microcystins YR and LR) by two experiments: one with Microcystis cells and the other with two purified microcystins. In the experiment with Microcystis cells, an increase of heterotrophic bacteria observed from the beginning of the experiment, was followed by decomposition of the algal cells and the subsequent release of microcystins into the filtrate fraction. The amounts of the toxins initially present in the cells were quantitatively detected in the filtrate fraction on the 35th day. The decomposition of microcystin YR began on the 42nd day. The decomposition rate of the two toxins was different. The decomposition rate of purified microcystins YR and LR, compared in distilled water and culture medium, respectively, indicated clearly that microcystin YR was more labile to decomposition than microcystin LR in the culture medium. At the end of the experiment (45th day) microcystin YR decreased to 58.6%, while 86.2% of microcystin LR remained.

摘要

在黑暗和好氧条件下,对有毒蓝绿藻(蓝细菌)铜绿微囊藻的分解过程进行了研究,该过程与七肽毒素(微囊藻毒素YR和LR)含量的变化有关,通过两个实验进行:一个实验使用微囊藻细胞,另一个实验使用两种纯化的微囊藻毒素。在使用微囊藻细胞的实验中,从实验开始就观察到异养细菌数量增加,随后藻类细胞分解,微囊藻毒素随后释放到滤液部分。细胞中最初存在的毒素量在第35天在滤液部分中被定量检测到。微囊藻毒素YR的分解在第42天开始。两种毒素的分解速率不同。分别在蒸馏水和培养基中比较纯化的微囊藻毒素YR和LR的分解速率,清楚地表明在培养基中微囊藻毒素YR比微囊藻毒素LR更易分解。在实验结束时(第45天),微囊藻毒素YR降至58.6%,而微囊藻毒素LR仍有86.2%留存。

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