通过两种集胞藻属分离株对六价铬去除行为的评估：基于胞外多糖（EPS）的产生及单体组成
Evaluation of chromium(VI) removal behaviour by two isolates of Synechocystis sp. in terms of exopolysaccharide (EPS) production and monomer composition.
作者信息
Ozturk Sahlan, Aslim Belma, Suludere Zekiye
机构信息
Nevsehir University, Faculty of Science and Arts, Department of Biology, 50300 Nevsehir, Turkey.
出版信息
Bioresour Technol. 2009 Dec;100(23):5588-93. doi: 10.1016/j.biortech.2009.06.001. Epub 2009 Jun 26.
Chromium(VI) removal and its association with exopolysaccharide (EPS) production in cyanobacteria were investigated. Synechocystis sp. BASO670 produced higher EPS (548 mg L(-1)) than Synechocystis sp. BASO672 (356 mg L(-1)). While the EC(50) of the Cr(VI) for Synechocystis sp. BASO670 and Synechocystis sp. BASO672 were determined as 11.5 mg L(-1), and 2.0 mg L(-1), respectively, there was no relation between Cr(VI) removal and EPS production. Synechocystis sp. BASO672, which has higher EPS value, removed (33%) more Cr(VI) than Synechocystis sp. BASO670. Monomer compositions of EPS of each of the isolates were determined differently. Synechocystis sp. BASO672 which removed higher Cr(VI), had higher values of uronic acid and glucuronic acid (192 microg/mg and 89%, respectively). Our results showed that EPS might play a role in Cr(VI) tolerance. Monomer composition, especially uronic acid and glucuronic acid content of EPS may have enhanced Cr(VI) removal.
研究了蓝藻中六价铬的去除及其与胞外多糖（EPS）产生的关系。聚球藻属BASO670产生的EPS（548 mg L⁻¹）高于聚球藻属BASO672（356 mg L⁻¹）。虽然聚球藻属BASO670和聚球藻属BASO672对六价铬的半数有效浓度（EC₅₀）分别测定为11.5 mg L⁻¹和2.0 mg L⁻¹，但六价铬的去除与EPS的产生之间没有关系。EPS值较高的聚球藻属BASO672去除的六价铬（33%）比聚球藻属BASO670更多。每种分离物的EPS单体组成测定结果不同。去除六价铬较多的聚球藻属BASO672的糖醛酸和葡萄糖醛酸值较高（分别为192 μg/mg和89%）。我们的结果表明，EPS可能在六价铬耐受性中起作用。EPS的单体组成，尤其是糖醛酸和葡萄糖醛酸含量可能增强了六价铬的去除。
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