INTERNATIONAL PROGRAMME ON CHEMICAL SAFETY WORLD HEALTH ORGANIZATION TOXICOLOGICAL EVALUATION OF SOME FOOD COLOURS, ENZYMES, FLAVOUR ENHANCERS, THICKENING AGENTS, AND CERTAIN FOOD ADDITIVES WHO FOOD ADDITIVES SERIES 6 The evaluations contained in this publication were prepared by the Joint FAO/WHO Expert Committee on Food Additives which met in Rome, 4-13 June 19741 World Health Organization Geneva 1975 1 Eighteenth Report of the Joint FAO/WHO Expert Committee on Food Additives, Wld Hlth Org. techn. Rep. Ser., 1974, No. 557. FAO Nutrition Meetings Report Series, 1974, No. 54. BRILLIANT BLACK PN BIOLOGICAL DATA BIOCHEMICAL ASPECTS At concentrations of 2-400 mg/litre the colour inhibits pepsin but not lipase (Diemair & Mäusser, 1951) and at 12.5 mg/litre it inhibits trypsin inconsistently (Diemair & Boeckhoff, 1953). Intravenous injection into rabbits and dogs of 50 mg/kg produced only small amounts in the urine (Hecht, 1960). Heated in the presence of reducing sugars the colour is partially decomposed and gives an orange derivative, isolated by paper chromatography, which is the disodium salt of 4' (4-sulfo-l-phenylazo) l'amino 7' sulfonaphtalene (Saenz Lascano Ruiz, & Laroche, 1960). "Rats were given Brilliant Black PN. During the experimental work, the faeces and urine of the animals were collected and the presence of the dye was noted in faeces and not in the urine. Quantitative determination of the dye in the faeces indicated that, from the total amount of the dye administered to the rats, 0.6% was excreted in the faeces (Piekarski, 1960). It has been shown that orally administered Black Brilliant PN is metabolized in the caecum of the rat (Ryan & Welling, 1970). The presence of coloured faeces in this study showed that, at the dosage levels used, some of the dye passed through the gastrointestinal system unchanged. Similar observations were made by Gaunt et al. (1967) in rats and Gaunt et al. (1969) in pigs. TOXICOLOGICAL STUDIES Special studies on mutagenicity The colour was tested for mutagenic effect in a concentration of 0.5 g/100 ml in cultures of Escherichia coli. No mutagenic effect was found (Lück & Richerl, 1960). Acute toxicity LD50 Animal Route mg/kg bw Reference Oral > 5 000 DFG, 1987 Mouse > 2 000 Gaunt et al., 1967 i.p. 500-1 000 Gaunt et al., 1967 Oral > 5 000 Gaunt et al., 1967 Rat i.p. 1 100 Gaunt et al., 1967 > 2 000 DFG, 1957 i.v. 2 500 DFG, 1957 approx. Five rats were given 1.5 g/kg bw orally for 22 days. No Heinz bodies were found (DFG, 1957). In an experiment with guinea-pigs it was found that this colour had no sensitization activity (Bar & Griepentrog, 1960). A cat fed 0.1 g/kg bw per day for seven days developed no Heinz bodies (DFG, 1957). Short-term studies Rat Groups of 16 male and 16 female weanling rats were fed diets containing 0, 0.3%, 1.0%, and 3.0% colour for 90 days. Growth retardation associated with diminished food intake was evident only in males at the 3% level. This was shown by a paired feeding test. Haematological examination, liver and kidney function tests were normal. Organ weight of testes and kidneys increased in males at the 3% level only. No untoward histopathological findings were seen (Gaunt et al., 1967). Long-term studies Rat Sixteen rats were fed Black PN at 0.1% of the diet (average daily intake 0.06 g/kg bw) for 410 days and were observed for 761 days. The total dose per animal was 5.6 g. One rat died prematurely. No tumours were observed (Hecht & Wingler, 1952; DFG, 1957). Another group of 10 rats was given 0.5% Black PN in their drinking water (average daily intake 0.5 g/kg bw) for 384 days and observed 545 days. Total intake per animal was 20 g. No tumours were seen (DFG, 1957). In a second experiment a group of 10 rats was again given 0.5% Black PN in their drinking water (average daily intake 0.46 g/kg bw) for 502 days and observed for 923 days. Total intake per animal was 50 g. No tumours were noted (DFG, 1957). A group of 10 rats received twice weekly subcutaneously 0.5 ml of a 1% solution (= 5 mg) for 365 days and was observed for 653 days. The total amount per animal was 0.5 g. Two animals died prematurely but no tumours were noted (DFG, 1957). "Groups of 24 male and 24 female weanling rats were fed for 2 years on diets containing 0, 1000, 5000 or 10 000 ppm Brilliant Black PN. No effects attributable to treatment were found in respect to mortality, food intake, body weight gain, haematology, blood serum chemistry, renal concentration tests, organ weights or incidence of pathological findings, including tumours (Gaunt et al., 1972)." Comments: Little is known about the metabolism of this colour. The earlier long-term studies in rats using oral administration in the diet or drinking water did not reveal carcinogenicity but were inadequate as regards the numbers of animals used and the parameters studied. Later long-term studies in the mouse and rat did not reveal any significant adverse effects due to administration of the compound. Reproduction and embryotoxicity including teratology studies are not available. EVALUATION Level causing no toxicological effect Rat: 1% (= 10 000 ppm) in the diet equivalent to 500 mg/kg bw. Estimate of acceptable daily intake for man 0-2.5 mg/kg bw* FURTHER WORK OR INFORMATION Required by June 1978 (a) metabolic studies preferably including man; (b) adequate reproduction and embryotoxicity including teratological studies. * Temporary. REFERENCES Bar, F. & Griepentrog, F. (1960) Med. u. Ernähr., 1, 99 Deutsche Forschungsgemeinschaft (1957) Farbstoff Komission, Mitteilung, 6, p. 58 Diemair, W. & Häusser, H. (1951) Z. Lebensmitt.-Untersuch., 92, 165 Diemair, W. & Boeckhoff, K. (1953) Z. Analyt. Chem., 139, 35 Gaunt, I. F. et al. (1967) Fd. Cosmet. Toxicol., 5, 171 Gaunt, I. F. et al. (1969) Fd. Cosmet. Toxicol., 7, 557 Gaunt, I. F. et al. (]972) Fd. Cosmet. Toxicol., 10, 17 Hecht, G. & Wingler, A. (1952) Arzneimittel-Forsch., 2, 192 Lück, H. & Richerl, E. (1960) Z. Lebensmitt.-Untersuch., 112, 157 Piekarski, L. (1960) Roczniki PZH, 11, No. 4, p. 353 Ryan, A. J. & Welling, P. G. (1970) Fd. Cosmet. Toxicol., 8, 487 Saenz Lascano Ruiz, I. & Laroche, C. (1960) Ann. Fals. Exp. Chim., 53, 581
See Also: Toxicological Abbreviations Brilliant black PN (WHO Food Additives Series 13) Brilliant BLACK PN (WHO Food Additives Series 16) BRILLIANT BLACK PN (JECFA Evaluation)