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. 2015 Apr 27;10(4):e0125701. doi: 10.1371/journal.pone.0125701

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© 2015 Fan et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 6 — The signals generated by the nanoparticle-streptavidin and streptavidin systems were compared among four different enzyme-substrate systems: (A) TurboNuclease and FLOS; (B) alkaline phosphatase (ALP) and p-nitrophenylphosphate (pNPP); (C) horseradish peroxidase (HRP) and o-Phenylenediamine (OPD); and (D) alkaline phosphatase (ALP) and 4-methylumbelliferyl phosphate (4-MUP). Each enzyme was prepared at 1:10 serial dilutions (10^–4–10^–9 M). Negative control (NC) contained all components except the enzyme. The cutoff (2.1 fold higher than the NC signal) is indicated by the dotted line. Means ± SD are shown.