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. 2013 Dec 23;8(12):e84766. doi: 10.1371/journal.pone.0084766

Figure 4. Enzyme assay of p-nitrophenol 4-monooxygenase (PnpM).

Figure 4

(A) Spectrophotometric analysis PnpM activity as shown by decrease in spectral absorption at 420 and 340 nm corresponding to depletion of p-nitrophenol (PNP) and NADH in a time dependent manner. (B) Lack of PnpM activity in negative control sample (C) Enzymatic transformation of PNP to BQ was confirmed by HPLC analysis.