期刊
BIOSENSORS & BIOELECTRONICS
卷 93, 期 -, 页码 212-219出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.09.001
关键词
Infectious disease diagnosis; Lab-on-a-disc; Loop-mediated isothermal amplification; Sample-to-answer
类别
资金
- Innovation and Technology Fund (ITF) Grant from the Hong Kong Special Administrative Region [ITS/227/12]
- CRF grant from the Hong Kong Special Administrative Region [CUHK1/CRF/12G]
- AoE from the Hong Kong Special Administrative Region [AoE/P-0/12]
- VC Discretionary Fund from The Chinese University of Hong Kong [4930722]
Sepsis by bacterial infection causes high mortality in patients in intensive care unit (ICU). Rapid identification of bacterial infection is essential to ensure early appropriate administration of antibiotics to save lives of patients, yet the present benchtop molecular diagnosis is timeconsuming and laborintensive, which limits the treatment efficiency especially when the number of samples to be tested is extensive. Therefore, we hereby report a microfluidic platform labonadisc (LOAD) to provide a sample-to-answer solution. Our LOAD customized design of microfluidic channels allows automation to mimic sequential analytical steps in benchtop environment. It relies on a simple but controllable centrifugation force for the actuation of samples and reagents. Our LOAD system performs three major functions, namely DNA extraction, isothermal DNA amplification and real-time signal detection, in a predefined sequence. The disc is self-contained for conducting sample heating with chemical lysis buffer and silica microbeads are employed for DNA extraction from clinical specimens. Molecular diagnosis of specific target bacteria DNA sequences is then performed using a realtime loopmediated isothermal amplification (RTLAMP) with SYTO-9 as the signal reporter. Our LOAD system capable of bacterial identification of Mycobacterium tuberculosis (TB) and Acinetobacter baumanii (Ab) with the detection limits 10(3) cfu/mL TB in sputum and 10(2) cfu/mL Ab in blood within 2 h after sample loading. The reported LOAD based on an integrated approach should address the growing needs for rapid pointofcare medical diagnosis in ICU.
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