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Figure 1. 

Schematic diagram of measuring β-Lg by MB@Cu-MOF electrochemistry.

Figure 2. 

The UV-vis spectra of MB solution and mixed solution of MB and copper chloride.

Figure 3. 

(a) FTIR spectrum and (b) X-ray diffraction of the Cu-MOF and the MB@Cu-MOF. SEM images of (c) the Cu-MOF and (d) the MB@Cu-MOF.

Figure 4. 

(a) UV-Vis and (b) cyclic voltammogram of the MB, the Cu-MOF, the MB@Cu-MOF and the supernatant. SEM images of (c) the MB @ Cu-MOF and (d) the MB@Cu-MOF incubation with β-Lg.

Figure 5. 

(a) UV-vis absorption spectra and differential pulse voltammograms of different concentrations of MB. (b) Standard curves of MB on UV-vis spectra and differential pulse voltammetry curves.

Figure 6. 

(a) UV-vis and (b) differential pulse voltammetry (DPV) of the supernatant after incubation with different concentrations of β-Lg and MB@Cu-MOF. Standard curve of logarithm of β-Lg concentration on (c) UV-vis spectrum and (d) DPV curve.

Figure 7. 

(a) The nature and distribution of surface charge of β-Lg, lysozyme, α-La and ovalbumin. (b) The absorbance of the MB@Cu-MOF incubation with β-Lg (1 mg/mL), lysozyme (1 mg/mL), α-La (1 mg/mL) and Ovalbumin (1 mg/mL).