Hypoglycemic Effect of Culture Broth of Bacillus subtilis S10 Producing 1-Deoxynojirimycin

1-Deoxynojirimycin을 생산하는 Bacillus subtilis S10 배양액의 혈당강하 효과

  • 조용석 ((주)바이오토피아 부설생명과학연구소) ;
  • 박영식 ((주)바이오토피아 부설생명과학연구소) ;
  • 이재연 ((주)바이오토피아 부설생명과학연구소) ;
  • 강경돈 ((주)바이오토피아 부설생명과학연구소) ;
  • 황교열 ((주)바이오토피아 부설생명과학연구소) ;
  • 성수일 ((주)바이오토피아 부설생명과학연구소)
  • Published : 2008.11.28


1-Deoxynojirimycin (DNJ) is a strong $\alpha$-glucosidase inhibitor which inhibits hyperglycemia in animals. To select the Bacillus strains highly producing DNJ, 4,000 strains were isolated from soil and grain samples. By the inhibitory activity against $\alpha$-glucosidase, nine Bacillus strains were selected and then identified by 16S rDNA sequencing. B. subtilis S10 was finally selected as the best strain for the production of DNJ. Various carbon sources and nitrogen sources in culture medium were evaluated for the highest production of DNJ. As the results, the optimized concentration of carbon source and nitrogen source was 1.0% galactose and 1.6% polypeptone and the concentration of DNJ produced was 0.75 g/L. The effect of culture supernatant of B. subtilis S10 on lowering blood glucose level was investigated in streptozotocin (STZ)-induced diabetic mice model. Mice were randomly assigned to control group (saline) and three test groups such as acarbose group, silkworm powder group and B. subtilis S10 group. After eight-week oral feeding, blood glucose levels of the B. subtilis S10 and silkworm powder groups were respectively $209.1{\pm}19.6\;mg/dL$ (59.1%) and $208.6{\pm}39.8\;mg/dL$ (59.0%) lower than $510{\pm}10\;mg/dL$ of the control group. These results indicated that the culture supernatant of B. subtilis S10 was able to reduce the blood glucose level in STZ-induced diabetic mice.


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