Rapid Identification of Fupenzi (Rubus chingii Hu) and Its Adulteration by AuNP Visualization

Figure 4

The relationship between concentration of different adulterants and particle size of AuNPs and solution color. (a) A–F represent the color of the AuNP mixture solution at the concentration of 0%, 1%, 2%, 5%, 10%, and 20% adulterants, respectively. (b) The linear fitting diagram of the concentration of different adulterants against the particle size of AuNP mixtures. (c) According to the relationship between the concentration of different adulterants and the color of the solution-produced color card. (R² = 0.9761).

(a)

(b)

(c)