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. Author manuscript; available in PMC: 2017 Apr 27.
Published in final edited form as: Chem Sci. 2016 Aug 30;8(1):550–558. doi: 10.1039/c6sc02962k

Figure 2. Fluorescence-based chloride sensing.

Figure 2

(A) Chloride quenches CA-Cysteine fluorescence strictly under acidic conditions. (B) Stern-Volmer plots linearizing quenching rates over chloride concentration reveal that chloride sensitivity (KSV, or the slope) increases with acidity, R2>0.997. Detection procedures for chloride sensing (shown in schematics) are simplified by standardizing at fixed sulfuric acid concentrations. (C) Comparison of quenching efficiency of common ions, each at 100 mM, in the presence of CA-Cysteine at pH 1.3 (except for OH-).