Research Article
Four Derivative Spectrophotometric Methods for the Simultaneous Determination of Carmoisine and Ponceau 4R in Drinks and Comparison with High Performance Liquid Chromatography
Table 3
Method validation for the simultaneous determination of Carmoisine and Ponceau 4R in laboratory prepared mixtures by the proposed methods.
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The intraday (), average of three concentrations (2, 6, and 10 µg mL−1) for Carmoisine and Ponceau 4R repeated three times within the day. bThe interday (), average of three concentrations (2, 6, and 10 µg mL−1) for Carmoisine and Ponceau 4R repeated three times in three successive days. *The values of % recovery are an average of five replicates of each of five synthetic mixtures at different concentration ratios of C and P (2–10 µg mL−1). RSD %: relative standard deviation. |