Plotting the respective functions yields an enhancement factor of ≈ 6x for PEG-PL SWCNTs (Figure ) and ≈ 120x for (G2T)10-modified SWCNTs (Figure ) for BB. As PPD does not absorb in the visible, we had no reference value to compare the observed fluorescence enhancement with a traditional read-out. However, we expect that the consummation of the PPD during the enzymatic reaction reverses this positive modulation thereby amplifying the negative signal generated from BB.