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- W1977644702 abstract "The purpose of this study was to determine the potential toxicity of docosahexaenoic acid-rich microalgae from Schizochytrium sp. (DRM), administered in the diet to rats for at least 13 weeks. DRM was administered in the diet to groups of 20 male and 20 female Sprague-Dawley derived rats (Crl:CD(SD)BR) to provide dosages of 0, 400, 1500, and 4000 mg/kg/day for at least 13 weeks. DRM contained high levels of fat (approximately 41% w/w) of which long-chain highly unsaturated fatty acids (PUFAs) were a major component. Vitamin E acetate was added to DRM at manufacture to provide supplementary dietary antioxidant given the highly unsaturated fat content of DRM. Untreated controls received the basal diet only. An additional group of 20 males and 20 females received basal diet mixed with fish oil (Arista) to provide a target dosage of 1628 mg/kg/day, an amount of fat comparable to that received by rats administered the highest dose of DRM. Vitamin E acetate was also added to the fish oil to provide a comparable level of dietary antioxidant provided to high-dose DRM rats. There were no treatment-related effects in clinical observations, body weights or weight gains, food consumption, hematologic or urinalysis values, gross necropsy findings, or organ weights and there were no deaths. The only treatment-related changes in clinical chemistry parameters were decreases in high-density lipoproteins and cholesterol in the DRM and fish oil groups when compared to the untreated controls. These changes were expected based on the high PUFA content of DRM and fish oil. There were no microscopic findings suggestive of toxicity. Periportal hepatocellular fat vacuolation (accumulation of fat) was observed only in the livers of female rats in both the DRM (all dosages) and fish oil groups. This finding was expected given the higher fat content of both the DRM and the fish oil diets compared to the basal diet fed to the untreated controls. A slight increase in the incidence, but not severity, of cardiomyopathy was observed only in the 4000 mg/kg/day DRM males. This finding was not considered adverse because cardiomyopathy occurs spontaneously in rats and especially male rats of the Sprague-Dawley strain when fed high levels of fat. Since cardiomyopathy does not develop in other species including primates fed high-fat diets, its occurrence in rats is considered to have little relevance to human health. This study demonstrates that administration of DRM did not produce any treatment-related adverse effects in Sprague-Dawley rats of relevance to humans at dosages up to 4000 mg/kg/day for 13 weeks." @default.
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- W1977644702 date "2001-04-01" @default.
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- W1977644702 title "Safety Assessment of DHA-Rich Microalgae from Schizochytrium sp." @default.
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- W1977644702 doi "https://doi.org/10.1006/rtph.2001.1458" @default.
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