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미세 유체 시스템을 통한 극소 농도 세균액에 적합한 신속한 항생제 감수성 검사
황순재(Sunjae Hwang),최정일(Jungil Choi) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
After penicillin was first developed, antibiotics greatly extended the average life span of mankind. Now, 100 years after penicillin appeared, we enjoy the effects too much. Antibiotics were so abused that numerous antibiotic-resistant bacteria have emerged, and the future for humanity is in great danger. In order to reduce the abuse of antibiotics, it is most important to give patients an appropriate amount of antibiotics. Therefore, it is necessary to find the type and the suitable amount of antibiotics through Antimicrobial susceptibility test(AST). Existing AST takes a very long time about 3 days. It takes too long to cope with acute infections, such as sepsis. So we need to reduce the time required for AST. we developed a microfluidic system-based AST. The conventional method was to cultivate bacteria to the extent that they could be seen with the naked eye. But the method takes too much time. The system we developed employs a method of concentrating using high speed rotation after loading a micro-concentration of bacterial samples into the device. In this way, AST can be run in just 2 hours. In conclusion, it was confirmed that the system we developed significantly shortened the time compared to the existing AST platform.
미세유체 디스크 칩에서 원심력을 이용한 극소 농도의 박테리아에 대한 대량의 초고속 항생제 감수성 검사 시스템
황순재(Sunjae Hwang),김승경(Seungkyoung Kim),최정일(Jungil Choi) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Traditional AST technologies are time-consuming, so rapid AST technologies are being developed to compensate for these shortcomings. In particular, image-based rapid AST technologies are able to provide results more rapidly than conventional methods. However, these techniques require a high concentration of bacterial samples and take amount of time to obtain these samples. The method we have developed uses centrifugal force to concentrate bacterial samples at a low concentration in small volume chambers. The testing chamber has a micro-size well structure that prevents bacteria from escaping the observation area. Then, microscopic time-lapse observed the response of bacteria to antibiotics. For Escherichia. coli ATCC 25922 bacterial samples, about 16% concentration effect was confirmed at a concentration of 105 CFU/ml, and AST results were obtained in 2 hours.
땀 속 바이오마커 수집 및 분석을 위한 마이크로 플루이딕 땀 센서
정준엽(JunYeob Chung),이상영(SangYoung Lee),황순재(SunJae Hwang),현하영(HaYoung Hyun),최정일(Jungil Choi) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Sweat consists of 99% water and 1 % biomarkers. By using these biomarkers, we can expect the disease such as stroke, dehydration and diabetes. Stroke and diabetes are the critical disease so all patients have to monitor their health condition. Chloride levels and sweat loss can be the good factor for preventing stroke and dehydration. Moreover, glucose is the important factor for diabetic. Here, we present soft, skin interfaced microfluidic sweat sensor for detecting not only glucose and chloride but also the sweat rate. Human studies demonstrate the analytical possibility of glucose and chloride in sweat. Also, this sweat sensor shows the high potential in collecting sweat by demonstrating the correlation between sweat collection and total sweat loss. We expect this sweat sensor can help people to detect and monitor their health condition.