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Updated: Apr 29, 2026
Immuno-fluorescence Assay of Leptospiral Surface-exposed Proteins
Published on: July 1, 2011
Development of an immunochromatographic test with anti-LipL32-coupled gold nanoparticles for Leptospira detection
Chintana Chirathaworn1, Weena Janwitthayanan, Amornpun Sereemaspun
1Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
Abstract:
Detection of antibody specific to Leptospira by various immunological techniques has been used for leptospirosis diagnosis. However, the sensitivity of antibody detection during the first few days after infection is low. Molecular techniques are suggested to provide earlier diagnosis than antibody detection, but a rapid and easy to perform assay for Leptospira antigen detection would provide an additional useful tool for disease diagnosis. In this study, we coupled gold nanoparticles with antibody to LipL32, a protein commonly found in pathogenic Leptospira. This coupled gold reagent was used in the immunochromatographic strip for Leptospira detection. We demonstrated that the sensitivity of Leptospira detection by this strip was 10(3) ml(-1). There was no positive result detected when strips were tested with non-pathogenic Leptospira, Staphylococcus aureus, Streptococcus group B, Acinetobacter baumannii, Escherichia coli, Salmonella typhi, Klebsiella pneumoniae, Enterococcus faecalis or Enterococcus faecium. These data suggest that gold nanoparticles coupled with antibody to LipL32 could be used for Leptospira detection by a rapid test based on an immunochromatographic technique.
Insights
This study developed a rapid immunochromatographic test using gold nanoparticles to detect pathogenic Leptospira bacteria. The test shows high sensitivity and specificity, offering a valuable tool for early leptospirosis diagnosis.
Area of Science:
- Microbiology
- Immunology
- Nanotechnology
Background:
- Leptospirosis diagnosis often relies on antibody detection, which has low sensitivity in early infection stages.
- Molecular techniques offer earlier diagnosis, but a rapid antigen detection assay is needed.
- LipL32 is a key protein antigen in pathogenic Leptospira.
Purpose of the Study:
- To develop a rapid immunochromatographic test for detecting pathogenic Leptospira.
- To utilize gold nanoparticles conjugated with anti-LipL32 antibodies for enhanced detection.
- To evaluate the sensitivity and specificity of the developed assay.
Main Methods:
- Conjugation of gold nanoparticles with antibodies specific to the LipL32 protein.
- Development of an immunochromatographic strip assay utilizing the gold nanoparticle-antibody conjugate.
- Testing the assay's sensitivity against known concentrations of pathogenic Leptospira.
- Assessing the assay's specificity against various pathogenic and non-pathogenic bacteria.
Main Results:
- The immunochromatographic strip demonstrated a detection sensitivity of 10(3) Leptospira per milliliter.
- The assay showed high specificity, with no cross-reactivity observed against tested non-pathogenic Leptospira strains and other common bacteria.
- The developed test effectively detected pathogenic Leptospira.
Conclusions:
- Gold nanoparticles conjugated with anti-LipL32 antibodies are effective for rapid Leptospira detection.
- The immunochromatographic strip assay provides a sensitive and specific tool for diagnosing leptospirosis.
- This rapid test offers a valuable alternative or adjunct to existing diagnostic methods for leptospirosis.
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