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고광표 ( Gwangpyo Ko ),김진경 ( Jin-kyeong Kim ),조승화 ( Seong-wha Jo ),정도연 ( Do-youn Jeong ),운노타쯔야 ( Tatsuya Unno ) 한국응용생명화학회 2020 Journal of Applied Biological Chemistry (J. Appl. Vol.63 No.1
Fermented foods have been recognized as functional foods that provide health benefits, including the modulation of intestinal microbiota. Therefore, the aim of the present study was to examine the effects of coffee beans fermented with Lactobacillus plantarum and Bacillus amyloliquefaciens on healthy human gut microbiota. Fermentation increased the content of beneficial substances (i.e., flavonoids and polyphenols). The consumption of fermented coffee increased the occurrence of beneficial microorganisms such as fiber degraders and short-chain fatty acid producers, although no significant microbiota shifts were observed after the coffee consumption. The analysis of metabolic activities also showed no difference after the coffee consumption. Our study demonstrates that the consumption of the fermented coffee may increase some beneficial bacterial while remaining the gut microbiota and its activities.
학교식당 및 교실배식 과정 전·후 미생물 오염에 관한 연구
정해용,손주혜,이재윤,이인애,고지연,고나윤,박성준,고광표,김성균,Jung, HeaYong,Sohn, JuHae,Lee, JaeYoon,Lee, InAe,Ko, JiYean,Ko, NaYun,Park, SungJun,Ko, GwangPyo,Kim, Sungkyoon 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.6
Objectives: The aim of this study is to investigate microbial contamination in the school food service environment for the assessment of microbial food safety. Methods: We collected both swab samples from tables and desks and airborne bacterial samples from an elementary school (School A) and a high school (School B). Heterotrophic plate count, total coliform, Staphylococcus aureus, and Bacillus cereus were measured with selective media to quantify microbial concentration. PCR assay targeting 16S rRNA genes was performed to identify the strains of S. aureus and B. cereus isolated. In addition, we made a food service checklist for the locations to evaluate the food service environment. A Wilcoxon test was employed to examine the differences in microbial concentration between before lunchtime and afterwards. Results: Heterotrophic plate counts showed higher levels after-lunch compared to before-lunch at School B. However, levels of S. aureus were higher in the after-lunch period (p<0.05) in both classrooms and in the cafeteria in School A. B. cereus was only sparsely detected in School B. Several samples from food dining carts were found to be contaminated with bacteria, and facilities associated with food delivery were found to be vulnerable to bacterial contamination. Although microbial concentrations in the air showed little difference between before- and after-lunchtime in the cafeteria in School A, those in classrooms were greater after-lunchtime at both schools. Conclusion: Our results suggested that the microbial safety in schools after lunchtime of concern. Necessary preventive measures such as hygiene education for students and food handlers should be required to minimize microbial contamination during food service processes in schools.
Effect of Metformin on Metabolic Improvement and Gut Microbiota
Lee, Heetae,Ko, GwangPyo American Society for Microbiology 2014 Applied and environmental microbiology Vol.80 No.19
<P>Metformin is commonly used as the first line of medication for the treatment of metabolic syndromes, such as obesity and type 2 diabetes (T2D). Recently, metformin-induced changes in the gut microbiota have been reported; however, the relationship between metformin treatment and the gut microbiota remains unclear. In this study, the composition of the gut microbiota was investigated using a mouse model of high-fat-diet (HFD)-induced obesity with and without metformin treatment. As expected, metformin treatment improved markers of metabolic disorders, including serum glucose levels, body weight, and total cholesterol levels. Moreover, <I>Akkermansia muciniphila</I> (12.44% ± 5.26%) and <I>Clostridium cocleatum</I> (0.10% ± 0.09%) abundances increased significantly after metformin treatment of mice on the HFD. The relative abundance of <I>A. muciniphila</I> in the fecal microbiota was also found to increase in brain heart infusion (BHI) medium supplemented with metformin <I>in vitro</I>. In addition to the changes in the microbiota associated with metformin treatment, when other influences were controlled for, a total of 18 KEGG metabolic pathways (including those for sphingolipid and fatty acid metabolism) were significantly upregulated in the gut microbiota during metformin treatment of mice on an HFD. Our results demonstrate that the gut microbiota and their metabolic pathways are influenced by metformin treatment.</P>