A new method for determination of polysaccharides in adsorption of Hg2+

A new method for determination of polysaccharides in adsorption of Hg2+
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吸附Hg2多糖测定新方法

DOI:
10.1016/j.microc.2022.107962
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发表时间:
2022-09
影响因子:
4.8
通讯作者:
CuiLing Wu
CuiLing Wu
中科院分区:
化学2区
文献类型:
--
作者:
XiaoTao Yan;JiaFeng Huang;Xiao Xiao;ChangBei Ma;Jiang Zhang;Olena Zhur;MingYang Zhou;HaiLun He;CuiLing Wu

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细菌胞外多糖(EPS)具有良好的重金属离子吸附功能,可用于重金属污染的污水处理。在这项工作中,我们开发了一种新的,无标记,打开荧光传感器检测EPS吸附Hg 2+。该方法基于荧光染料硫磺素T(ThT)诱导的G-四链体复合物到Hg 2+介导的T-Hg-T双链DNA形成的构象转换。通过该方法,水溶液中的Hg 2+可以通过荧光光谱法在5-1200 nM范围内检测。在最佳实验条件下(1.4 μM ThT,0.35 μM TBA,1.2 μM Hg 2+,25℃,pH7.5孵育10 min),整个反应和Hg 2+分析在10 min内完成。然后,我们利用这种简便的方法,用荧光光谱法检测不同的EPS对Hg 2+的吸附性能。这些EPS是由假交替单胞菌发酵产生的。BAY,芽孢杆菌属(Bacillussp.)RS 1,中棘鱼属Mesoniasp.华40和芽孢杆菌3. SL 7分别。EPS对Hg ~(2+)的吸附量在80.1 ~ 169.6mg/g之间。其中,Mesoniasp.华40对Hg 2+的吸附能力最强,为169.6mg/g。该方法为分析EPS对Hg 2+的吸附能力提供了一种有效的检测技术。
Bacterial extracellular polysaccharides (EPS) has a good heavy metal ion adsorption function and can be used in sewage treatment of heavy metal pollution. In this work, we develop a new, label-free, turn-on fluorescent sensor for detecting EPS adsorbed Hg2+. This approach is based on the conformational switch from G-quadruplex complex induced by fluorogenic dye Thioflavin T (ThT) to Hg2+mediated T–Hg–T double-stranded DNA formation. By this method, Hg2+in aqueous solution can be detected by fluorescence spectroscopy in the range of 5–1200 nM. The entire reaction and analysis of Hg2+was performed in 10 min under optimal experimental conditions (1.4 μM ThT, 0.35 μM TBA, 1.2 μM Hg2+and 10 min incubation time at 25℃, pH7.5). Then, we have utilized this facile approach to detect the adsorption properties of different EPS on Hg2+with fluorescence spectrometry. These EPS were produced by the fermentation ofPseudoalteromonassp. BAY,Bacillussp. RS1,Mesoniasp. Hua40 andBacillussp3. SL7 respectively. The Hg2+adsorption capacity of EPS is between 80.1 mg/g to 169.6 mg/g. Among them, the extracellular polysaccharides ofMesoniasp. Hua40 have the strongest Hg2+adsorption capacity, about 169.6 mg/g. This method provides an effective detection technique to analyze Hg2+adsorption capacity of EPS.
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