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Aluminum Silicate and Kaolin Layer Chromatography of Food Dyes Author: Hung-Cheh Chiang, Ke-Feng Huang

Abstract：

The thin-layer chromatography of food dyes has been studied by numerous investigators. The separation of synthetic food dyes by thin layers of cellulose1, starch2, silica gel3, aluminum oxide4, Polyamide5,6, polyamide-silica gel7, polya-mide-kieselguhr8,9 has been reported. But the separation on aluminum silicate and kaolin have not been studied. Kaolin (China clay)10, synthetic aluminum silicate, A12 (SiO3)11, and natural aluminum silicate (A12O3 xSiO2 yH2O)12 are used medicinally as an adsorbent and in the treatment of diarrhea caused by food poisoning of dysentery. In this studies, the separation of six kinds of blue, orange and red food dyes by aluminum silicate (synthetic and natural) and kaolin thin layer chromatography were described. For comparison, thin layer chromatography on silica gel is also described.

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