Abstract
Each component in 110 groups of two-component mixtures consisting of 11 kinds of food color was analyzed directly by dual-wavelength spectrophotometric method (Model 356 Hitachi dual-wavelength recording spectrophotometer) without chromatographic technique.
The most suitable reference wavelength (λ1) and measurement wavelength (λ2) chosen were shown in Table 2. The calibration curves obtained by using mixed solutions containing the analyte and diverse component of food colors were linear in the ratio 0-2.5: 1 between the analyte and interfering component, and correlation coeficient was 0.993-1.000 (Table 3). This method was applied for the determination of each component in artificial and commercial preparations of food color mixtures. Recoveries of mixed solutions were 93-101.18per cent (Table 4) and dye content of commercial samples analyzed by this procedure ranged from 69.20 to 140.48per cent of labelled amount (Table 5).
This method may be useful for quantitative analysis of food color mixtures.
