Research Article
A Highly Selective Colorimetric Sensor for Cysteine in Water Solution and Bovine Serum Albumin
Figure 2
(a) UV-vis spectra of 2-bromonaphthalene-1,4-dione (2 × 10−5 mol·L−1) in the presence of different concentration of CySH (0–2 × 10−5 mol⋅L−1) at 298 K. Condition: in ethanol-HEPES solution (5 : 5, v/v, pH of 7). The spectrum is acquired 5 min after CySH addition. Arrows indicate the direction of increasing CySH concentration. (b) UV-vis spectral changes of sensor upon the additions of various amino acids.
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