Document Detail

Fast and continuous microorganism detection using aptamer-conjugated fluorescent nanoparticles on an optofluidic platform.
MedLine Citation:
PMID:  25190089     Owner:  NLM     Status:  Publisher    
Fast and accurate pathogen detection in aquatic environments is challenging in many biomedical studies and microbial diagnostic applications. In this study, we developed a real-time, continuous, and non-destructive single cell detection method using target specific aptamer-conjugated fluorescent nanoparticles (A-FNPs) and an optofluidic particle-sensor platform. A-FNPs selectively bound to the surfaces of target bacteria (Escherichia coli) and labeled them with high affinity and selectivity so that target bacteria can be countable particles in an optofluidic particle-sensor. A-FNP-labeled target bacterial complexes were detected by the optofluidic particle-sensing system, which provides rapid and continuous single-cell detection. A-FNPs selectively bound to E. coli with a dissociation constant of 0.83nM, but did not bind Enterobacter aerogenes or Citrobacter freundii strains, which lacked affinity for the aptamer used. We demonstrated that our optofluidic device achieves a detection throughput of ~100 particles per second with high accuracy (~85%) in detecting single bacterial cells conjugated with A-FNPs. This approach can be immediately extended to the real-time, high-throughput detection of other microorganisms such as viruses that are selectively conjugated with A-FNPs. Collectively, these data suggest that optofluidic systems are widely applicable for the fast and continuous detection of microbial cells.
Jinyang Chung; Joon Sang Kang; Jong Soo Jurng; Jae Hee Jung; Byoung Chan Kim
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-23
Journal Detail:
Title:  Biosensors & bioelectronics     Volume:  -     ISSN:  1873-4235     ISO Abbreviation:  Biosens Bioelectron     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-9-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9001289     Medline TA:  Biosens Bioelectron     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier B.V. All rights reserved.
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