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Environmental and intercellular Pb2+ ions determination based on encapsulated DNAzyme in nanoscale metal-organic frameworks

Authors
  • Wu, Weihao1
  • Fan, Yaofang1
  • Tan, Bing1, 2
  • Zhao, Huimin1
  • 1 Dalian University of Technology, Dalian, 116024, China , Dalian (China)
  • 2 Henan Normal University, Xinxiang, 453007, China , Xinxiang (China)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
Oct 14, 2020
Volume
187
Issue
11
Identifiers
DOI: 10.1007/s00604-020-04586-z
Source
Springer Nature
Keywords
License
Yellow

Abstract

With the merits of low cost, simple synthesis procedure, and high affinity for metal ions, deoxyribozyme (DNAzyme) have played important roles in metal ions detection. However, the intracellular applications of DNAzyme are limited because of enzymatic degradation and inefficient cellular uptake. To address these problems, GR-5 as model DNAzyme was encapsulated into zeolitic imidazolate frameworks-8 (ZIF-8) nanoparticles by biomimetic mineralization. The positively charged ZIF-8 with high DNAzyme loading capacity retained their ability to enter cells. Compared with free DNAzyme, the biomimetic mineralization synthesis method has greatly improved the stability of pristine DNAzyme. The as-synthesized [email protected] composite exhibited good stability resisting DNase I, and was used as a sensitive fluorescent nanoprobe for Pb2+ determination and successfully achieved selective and sensitive determination for Pb2+ at λex/λem = 494/522 nm in real samples. The linear range for the determination of Pb2+ is 50 to 500 nM. Moreover, the highly active DNAzyme delivered by ZIF-8 allows noninvasive imaging of Pb2+ measurement in living cells. This strategy will extend the suitability of functional nucleic acids for in vitro and in vivo bioanalysis and bioimaging. Graphical abstract

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