Research Article
A Highly Selective Colorimetric Sensor for Cysteine in Water Solution and Bovine Serum Albumin
Figure 4
(a) Emission spectral changes of 2-bromonaphthalene-1,4-dione (2 × 10−5 mol⋅L−1) upon addition of CySH (0–4 × 10−5 mol⋅L−1) ( nm). (b) Emission spectral changes of 2-bromonaphthalene-1,4-dione (2 × 10−5 mol⋅L−1) upon addition of 1 equiv. CySH, Gly, Val, Leu, Ile, Asp, Glu, Arg, Lys, Thr, Phe, Met, His, Ala, Trp, Pro, Hyp, and Ser, respectively. Condition: in ethanol-HEPES solution (5 : 5, v/v, pH of 7). The spectrum is acquired 5 min after various amino acids addition. Arrows indicate the direction of increasing CySH concentration.
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