Abstract
In continuation of the previous work, infrared spectral analysis by the KBr-pellet method was carried out for detection of green dyes permitted for food (Guinea Green B, Light Green SF Yellowish, and Fast Green FCF) and Malachite Green. Examination of their absorption curves showed that it would be possible to detect up to ca. 40 γ by the use of their characteristic bands. As an example of this method, determination of Malachite Green present in Light Green SF Yellowish was carried out. Use of the absorption at 945cm-1 as a key band for Malachite Green and that at 1024cm-1 for Light Green SF Yellowish made it possible to determine each component from their mixture with a standard deviation, calculated by the method of Youden, of 0.878 for Light Green SF Yellowish and 1.159 for Malachite Green.
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