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A: The synthesis of Fe 3 O 4 /SiO 2 –SH; B: AuNPs and the Ab 1 link with Fe 3 O 4 /SiO 2 –SH; C: functions of IMB for antigen enrichment and separation from the sample, and HRP-antibody for the immunoreaction; D: the principle of the electrochemical detection.
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Fei et al. (2015) studied this question.
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