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Germanium is found in a range of minerals and ores and is present in foods including beans, tomato juice, oysters, tuna and garlic. Germanium is a non-metallic element, which can exist in valence states of 2 and 4. Clinical trials and use in private practices for more than a decade have demonstrated organic germanium's efficacy in treating serious disease including cancer, arthritis and senile osteoporosis. But it was rarely reported that inorganic germanium has biological properties. STB-BM contains mineral complex, rare earth elements and a little amount of inorganic germanium. The experiment was carride out the anti-obesity effect. To investigate anti-obesity effect of STB-BM, we measured the effect of body weight, fat weight (subcutaneous fat, epididymal fat, visceral fat, kidney fat and total fat) and serum biochemical level in rats fed high fat diets. STB-BM 35mg/kg suppressed the increasing ratio of body weight, epididymal fat weight, visceral fat weight, total fat weight, triglyceride and LDL-cholesterol (p<0.05).
The acute toxicity of STB-HO-BM was evaluated in Sprague Dawley (SD) rats and beagle dogs. STB-HO-BM was administered orally to rats at dose levels of 0 and 2,000 ㎎/㎏/day and to dogs at dose levels of 0, 500, 1,000 and 2,000 ㎎/㎏/day. In these experiments, there were no death and clinical changes which were related to STB-HO-BM administration. In addition, there were no significant changes between control and treated groups in body weights and autopsy findings. In conclusion, the administration of STB-HO-BM 2,000 ㎎/㎏ in SD rats and up to 2,000 ㎎/㎏ in beagle dogs was proved to be safe, and it is thought that STB-HO-BM may not show any toxicity in its clinical use.
We have investigated the genotoxicity of STB-HO-BM using in vitro and in vivo system such as Ames reverse mutation test, chromosomal aberration test and micronucleus test. in Ames reverse mutation test, STB-HO-BM treatment at the dose range up to 5,000 ug/plate did not induce mutagenicity in Salmonella typhimurium TA98, TA100, TA102, TA1535, TA1537 and in Escherichia coli WP2 uvrA with and without metabolic activation. Any significant aberration wasn't observed in chinese hamster lung (CHL) fibroblast cells treated with STB-HO-BM at the concentration of 12.5, 2.5, 5 ㎎/㎖ both in the absense and presence of metabolic activation system. In mouse micrnucleus test, no significant increase in the occurrence of micronucleated polychromatic erythrocytes was observed in ICR male mice orally administered with STB-HO-BM at the doses of 0.5, 1.0, 2.0 g/㎏. These results indicate that STB-HO-BM has no mutagenic potential under the condition in this study.
This study was performed to evaluate repeated-dose toxicities of STB-HO-BM in Sprague-Dawley rats. STB-HO-BM was administered orally to rats at dose levels of 0, 100, 300 and 1,000 mg/kg/day for 13 weeks. In recent study, there were no dose related changes in mortality, clinical signs, body weight changes, food and water consumption, opthalmoscopy, organ weights, urine analysis, hematological findings, and biochemical examination of all animals treated with STB-HO-BM. Gross and histopathological findings revealed no evidence of specific toxicity related to STB-HO-BM. These results suggest that the oral no observed adverse effect level (NOAEL) of STB-HO-BM may be over 1,000 mg/kg in rats.