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Subchronic toxicity, mutagenicity and allergenicity studies of a cultured dextrose food product.
Food and Chemical Toxicology 2003 May
MicroGARD(R) 200 is a fermented dextrose product used to extend food shelf-life by inhibiting spoilage due to Gram-negative bacteria, selected yeast and molds. The present studies were conducted to evaluate the safety of this food ingredient for determination of GRAS status. MicroGARD 200 was subjected to a bacterial reverse mutation assay, a subchronic oral toxicity study and an oral antigenicity study. It showed no evidence of mutagenic potential or toxicity in four strains of Salmonella typhimurium or in Escherichia coli strain WP2 uvrA with and without metabolic activation. MicroGARD 200 was orally administered to rats for 13 consecutive weeks at dietary concentrations of 0, 0.5, 2.0 or 5.0%. Water consumption and urinary excretion of sodium were slightly increased in both sexes at the high dose due to the sodium content of the test substance (about 6%). Increases in fasting glucose and decreased plasma creatinine were not accompanied by treatment-related histopathological changes and were within the normal range for historical controls. The potential antigenic properties of MicroGARD 200 were investigated via gavage in guinea pigs using an active systemic anaphylaxis (ASA) challenge [Annals of Allergy 67 (1991) 400; Allergy 49 (1994) 361]. There was no evidence of any anaphylactic sensitizing properties for MicroGARD 200.
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