Validated Spectrophotometric Methods for Simultaneous Determination of Food Colorants and Sweeteners

Figure 4

First derivative of the ratio spectra (a) of IND of a: 2, b: 4, c: 6, d: 8, e: 10 μgmL⁻¹, when 4 μgmL⁻¹ BB spectrum was used as a divisor, and first derivative of the ratio spectra (b) of BB f: 2, g: 4, h: 6, i: 8, j: 10 μgmL⁻¹, when 6 μgmL⁻¹ IND spectrum was used as a divisor.

(a)

(b)