ALUMINIUM LAKES of COLOURING MATTERS-铝淀染料.pdf

ALUMINIUM LAKES of COLOURING MATTERS GENERAL SPECIFICATIONS rd Prepared at the 63 JECFA (2004) and published in FNP 52 Add 12 (2004) superseding specifications prepared at the 25th JECFA (1981), published in FNP 19 (1981) and FNP 52 (1992). A group PTWI of 7 mg/kg bw for aluminium and its salts was established at the 33rd JECFA (1988) DEFINITION Aluminium lakes are prepared under aqueous conditions by reacting aluminium oxide with colouring matter complying with purity criteria set out in the appropriate specification monograph. Undried aluminium oxide is usually freshly prepared by reacting aluminium sulfate or aluminium chloride with sodium carbonate or sodium bicarbonate or aqueous ammonia. Following lake formation, the product is filtered, washed with water and dried. Unreacted aluminium oxide may also be present in the final product. Assay Content of colouring matter shall be within the range specified by the vendor. CHARACTERISTICS IDENTIFICATION Solubility (Vol. 4) Insoluble in water Identification of colouring Dissolve the sample using the method described in Colouring matter, matter (Vol. 4) Procedure for Lakes under Methods for Food Colours. Use the identification test described in the appropriate colour specifications monograph.