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Yu Zheng,Keping Zhang,Guangyu Su,Qi Han,Yanbing Shen,Min Wang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1
The acetic acid bacterium Acetobacter pasteurianus is used for vinegar fermentation with ethanol as a substrate. However, growth of A. pasteurianus is inhibited by high ethanol concentrations. The ethanol resistance of A. pasteurianus CGMCC 3089 was improved using a continuous ethanol stress adaptation culture. Characterization studies of strains during evolutionary processes were performed for improved ethanol resistance by comparison of cell growth and alcohol dehydrogenase (ADH) and aldehyde dehydrogenases (ALDH) activities. Improved resistance against ethanol was an inheritable phenotype instead of a transient physiologic adaptation. The evolutionary response of ADH and ALDH to high concentrations of ethanol was responsible for the ethanol resistance of A. pasteurianus, instead of mutations in the open reading frames of ADH and ALDH, or long nucleotide sequence insertion or deletion in the genome.
Jing Xu,Hairong Liu,Guangyue Su,Meng Ding,Wei Wang,Jincai Lu,Xiuli Bi,Yuqing Zhao 고려인삼학회 2021 Journal of Ginseng Research Vol.45 No.1
Background: Panax ginseng Meyer has been used as a nourishing edible herb in East Asia for thousands of years. 25-OH-PPT was first discovered as a natural rare triterpenoid saponin in ginseng stems and leaves by our group. Research found that it showed strong inhibitory effects on a-glucosidase and protein tyrosine phosphatase 1B, and protected cardiocytes (H9c2) through PI3K/Akt pathway. Methods: In the research, in order to optimize the 25-OH-PPT enrichment process, optimal macroporous resins and optimal purification conditions were studied. Meanwhile, the hypoglycemic effect and mechanism of 25-OH-PPT were evaluated by using STZ to establish insulin-dependent diabetic mice and the spontaneous type 2 diabetes DB/DB mice. Results and Conclusion: Research found that 25-OH-PPT can reduce blood glucose and enhance glucose tolerance in STZ model mice. It increases insulin sensitivity by upregulating GLUT4 and AMPK in skeletal muscle, and activating insulin signaling pathways. In DB/DB mice, 25-OH-PPT achieves hypoglycemic effects mainly by activating the insulin signaling pathway. Meanwhile, through the influence of liver inflammatory factors and lipids in serum, it can be seen that 25-OH-PPT has obvious anti-inflammatory and lipid-lowering effects. These results provide new insights into the study of ginseng as a functional food.