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Silver-Ion-Mediated DNAzyme Switch for the Ultrasensitive and SelectiveColorimetric Detection of Aqueous Ag+and Cysteine

机译:银离子介导的DNA酶开关用于Ag +和半胱氨酸水溶液的超灵敏和选择性比色检测

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DNA-metal base pairs currently attract considerable attentionbecause of their potential in sensing applications.Some metal ions can selectively bind to a few native or artificialbases in DNA duplexes to form metal-mediated basepairs.[1]This generally gives rise to an increase in the thermalstability of DNA duplexes.[2–9] In particular,DNA-metal base pairs are often utilized to promote a structuralchange in single-or double-stranded oligonucleotides,whichenables the detection of metal ions(e.g.,Hg2+and Ag+)byvarious means.[8,10-15]Hg2+is found to specifically interactwith the thymine-thymine(T-T)mismatch in DNA duplexes,[2]which provides a rationale for highly selective Hg2+detection by using T-containing oligonucleotides.[16-19]Similarly, cytosine-cytosine(C-C)pairs in DNA duplexes are able to exclusively capture Ag+to form C-Ag+–C base pairs.[8] Based on this feature,a DNA-based fluorescent Ag+ sensor has been constructed.[8]However,this sensor exhibits a poor selectivity for other heavy metal ions,presumably because of the interactions between the metal ions and the fluorophore.[8]Herein,we introduce a highly selective method for ultrasensitive colorimetric Ag+detection that utilizes a Gquadruplex-based DNAzyme.
机译:目前,DNA-金属碱基对由于其在传感应用中的潜力而备受关注。一些金属离子可以选择性地结合到DNA双链体中的一些天然或人工碱基上,从而形成金属介导的碱基对。[1]这通常导致金属对增加。 DNA双链体的热稳定性。[2–9]特别是,DNA-金属碱基对通常用于促进单链或双链寡核苷酸的结构变化,从而可以通过各种方式检测金属离子(例如Hg2 +和Ag +)。发现[8,10-15] Hg2 +与DNA双链体中的胸腺嘧啶-胸腺嘧啶(TT)错配特异性相互作用,[2]为使用含T的寡核苷酸进行高选择性Hg2 +检测提供了依据。[16- 19]类似地,DNA双链体中的胞嘧啶-胞嘧啶(CC)对能够专门捕获Ag +形成C-Ag + -C碱基对。[8]基于这一特征,构建了一种基于DNA的荧光Ag +传感器。[8]但是,该传感器对其他重金属离子的选择性较差,这可能是由于金属离子与荧光团之间的相互作用所致。[8] ,我们介绍了一种利用基于Gquadruplex的DNAzyme进行超灵敏比色Ag +检测的高选择性方法。

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