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 4
Assay results for the determination of Carmoisine and Ponceau 4R in soft drinks using the proposed methods and the reference HPLC method (NMKL 130).
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Results obtained are the average of five experiments for each method; SD: standard deviation. **The corresponding theoretical value for and at : 0.05 (: 2.31; : 6.39). |