Analytical performance of the proposed sensor
The validity of the proposed sensor was examined. Under optimum
conditions, the calibration plots for PPi were first evaluated
by plotting the different in the fluorescence intensity (I0–I) before
(I0) and after (I) the addition of PPi as a function of the concentration
of PPi. The results are shown in Fig. 5. The proposed sensor
exhibited a good linear relationship between the fluorescence
quenching level and the concentration of PPi. The proposed sensor
can be used in the linear working concentration range of