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Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
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Detection of Staphylococcus epidermidis by a Quartz Crystal Microbalance Nucleic Acid Biosensor Array Using Au
Han Xia1, Feng Wang2, Qing Huang3
1Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R China. hxia16@gmail.com.
Sensors (Basel, Switzerland)
|November 23, 2016
Summary
A novel quartz crystal microbalance (QCM) biosensor rapidly detects Staphylococcus epidermidis infections. This sensitive and specific method offers a low-cost diagnostic tool for clinical samples.
Area of Science:
- Biomedical Engineering
- Microbiology
- Analytical Chemistry
Background:
- Staphylococcus epidermidis is a major cause of hospital-acquired blood infections.
- Rapid and accurate detection of S. epidermidis is crucial for patient outcomes.
Purpose of the Study:
- To develop a rapid, sensitive, and specific nucleic acid biosensor for S. epidermidis detection.
- To utilize a piezoelectric quartz crystal microbalance (QCM) with gold nanoparticle amplification.
Main Methods:
- Immobilization of thiolated probes targeting S. epidermidis 16S rRNA on QCM arrays.
- Hybridization with PCR-amplified bacterial DNA fragments.
- Signal amplification using streptavidin-coated gold nanoparticles.
Main Results:
- Achieved a lowest detection limit of 1.3×10³ CFU/mL for S. epidermidis.
- Demonstrated a linear correlation from 1.3×10³ to 1.3×10⁷ CFU/mL.
- Clinical sample testing showed 97.14% sensitivity and 100% specificity compared to conventional methods.
Conclusions:
- The developed QCM biosensor system provides a rapid, low-cost, and sensitive method for identifying S. epidermidis infections.
- This technology has potential for clinical application in diagnosing bloodstream infections.
- The gold nanoparticle amplification strategy significantly enhances detection capabilities.
