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1.
Mercuric Contamination: Ultrasensitive SERS Substrate Integrated with Uniform Subnanometer Scale “Hot Spots” Created by a Graphene Spacer for the Detection of Mercury Ions (Small 9/2017) 下载免费PDF全文
Xingang Zhang Zhigao Dai Shuyao Si Xiaolei Zhang Wei Wu Hongbing Deng Fubing Wang Xiangheng Xiao Changzhong Jiang 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(9)
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Xiaojing Xing Ying Zhou Xueguo Liu Daiwen Pang Hongwu Tang 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(16):3412-3420
A novel fluorescence turn‐on strategy, based on the resistance of metal‐mediated molecular‐beacons (MBs) toward nuclease digestion and the remarkable difference in the affinity of graphene oxide (GO) with MBs and the mononucleotides, is designed for the biothiols assay. Specifically, the metal‐mediated base pairs facilitate the dye labeled MBs to fold into a hairpin structure preventing the digestion by exonuclease I, and thus allow the fluorescence quenching. The competition binding by biothiols removes metal ions from the base pairs, causing the nuclease reaction, and less decrease in the fluorescence is obtained after incubating with GO due to the weak affinity of the product‐mononucleotides to GO. Hg2+‐mediated MBs were firstly designed for the biothiols detection, and glutathione (GSH) was applied as the model target. Under the optimal conditions, the approach exhibits high sensitivity to GSH with a detection limit of 1.53 nM. Ag+‐mediated MBs based sensor was also constructed to demonstrate its versatility, and cysteine was studied as the model target. The satisfactory results in the determination of biothiols in serum demonstrate that the method possesses great potential for detecting thiols in biological fluids. This new approach is expected to promote the exploitation of metal‐mediated base pairs‐based biosensors in biochemical and biomedical studies. 相似文献