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Ce(Ⅲ)-ALC-F^- complex can react with hsDNA to form an electrochemically non-active supermolecular complex Ce(Ⅲ)-ALC-F^--DNA in the buffer solution of (CH2)6N4(pH=4.9),which results in the decrease of the peak current of Ce(Ⅲ)-ALC-F^-.This method can be ap