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A new simple and highly sensitive electrochemical method for pyrophosphatase (PPase) activity detection was developed based on the peroxidase-like activity of G-quadruplex-Cu2+ DNAzyme. In the absence of PPase, Cu2+ could coordinate with pyrophosphate (PPi) to form Cu2+-PPi compound. While in the presence of PPase, it could destroy the coordinate compound because PPase catalyzed the hydrolysis of...
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