“Turn-Off” Fluorescent Sensor for Pamidronate Disodium and Zoledronic Acid Based on Newly Synthesized Carbon Dots from Black Tea

Figure 3

Fluorescence quenching behavior of CDs after the addition of various concentrations (5 × 10⁻⁹ mol·L⁻¹ to 4 × 10⁻⁷ mol·L⁻¹) of pamidronate disodium (A-I (a)) and the addition of various concentrations (6 × 10⁻⁹ mol·L⁻¹ to 8 × 10⁻⁷ mol·L⁻¹) of zoledronic acid (A-G (c)). The linear plot of relative fluorescence intensity (F₀/F₁) of CDs as a function of pamidronate disodium (5 × 10⁻⁹ mol·L⁻¹ to 4 × 10⁻⁷ mol·L⁻¹ (b) and zoledronic acid (6 × 10⁻⁹ mol·L⁻¹ to 8 × 10⁻⁷ mol·L⁻¹ (d)). Every data point was the mean of three measurements. The error bars were the standard deviation.

(a)

(b)

(c)

(d)