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
中科院分区:
文献类型:
--
作者:
XiaoTao Yan;JiaFeng Huang;Xiao Xiao;ChangBei Ma;Jiang Zhang;Olena Zhur;MingYang Zhou;HaiLun He;CuiLing Wu
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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