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• W2129713080 abstract "The pH-controlled release of substrates from mesoporous SiO2 nanoparticles, MP-SiO2 NPs, is demonstrated by capping the pores with the Mg2+- or UO22+-dependent DNAzyme sequences and unlocking of the pores with Mg2+ ions or UO22+ ions at appropriate pH values. While the Mg2+-dependent DNAzyme reveals high activity at pH = 7.2, moderate activity at pH = 6.0, and it lacks activity at pH = 5.2, the UO22+-dependent DNAzyme reveals high activity at pH = 5.2, moderate activity at pH = 6.0, and it is catalytically inactive at pH = 7.2. Accordingly, the MP-SiO2 NPs were loaded with methylene blue, MB+, or thionine, Th+, and locked in the pores by the Mg2+- and UO22+-dependent DNAzyme sequences, respectively. The pH-programmed release of MB+ or Th+ from the loaded NPs proceeds, in the presence of Mg2+ ions or UO22+ ions, at pH = 7.2 and pH = 5.2, using the Mg2+- and UO22+-dependent DNAzyme as catalysts that cleave the protecting caps and unlock the pores, respectively. At pH = 6.0 the MB+- and Th+-loaded NPs are concomitantly unlocked by the two DNAzymes. The unlocking processes are selective and other metal ions do not stimulate the release processes." @default.
• W2129713080 created "2016-06-24" @default.
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• W2129713080 date "2014-01-01" @default.
• W2129713080 modified "2023-09-26" @default.
• W2129713080 title "pH-controlled release of substrates from mesoporous SiO₂ nanoparticles gated by metal ion-dependent DNAzymes" @default.
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• W2129713080 doi "https://doi.org/10.1039/c4tb00558a" @default.
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