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Electrophoretic determination of ricin using immunogold silver staining--comparison with simple "protein dot" method
Nihon Hoigaku Zasshi = the Japanese Journal of Legal Medicine
|August 1, 1989
Summary
Researchers developed a highly sensitive immunodetection method for ricin, a toxic plant protein. This assay can detect minute traces of ricin in victim tissues, aiding forensic investigations of poisoning cases.
Area of Science:
- Forensic Toxicology
- Biochemistry
- Immunochemistry
Background:
- Ricin is a highly toxic plant protein with potential for criminal misuse, causing delayed death.
- Detecting residual ricin in victim tissues is crucial for forensic investigations.
- Existing detection methods may lack the required sensitivity for trace amounts.
Purpose of the Study:
- To establish a sensitive electrophoretic immunodetection system for ricin.
- To evaluate and compare the sensitivity of various immunostaining procedures.
- To assess the system's utility in detecting ricin in post-mortem muscle tissue.
Main Methods:
- Ricin was added to rat muscle tissue extracts and separated using polyacrylamide gel electrophoresis.
- Proteins were electro-blotted onto nitrocellulose membranes for immunodetection.
- Compared indirect immunoperoxidase, Peroxidase-Anti-Peroxidase (PAP), Avidin-Biotin Complex (ABC), and Immunogold Silver Staining (IGSS) methods.
Main Results:
- PAP and indirect immunoperoxidase methods detected approximately 50 ng of ricin.
- ABC technique detected 10 ng of electro-blotted ricin.
- Immunogold Silver Staining (IGSS) demonstrated the highest sensitivity, detecting 4 ng of ricin via immunoblotting and less than 10 pg via dot staining.
Conclusions:
- The IGSS-immunoblotting system provides highly sensitive detection of ricin in muscle tissue.
- This method is suitable for demonstrating residual ricin at injection sites in deceased victims.
- IGSS offers a significant advancement in the forensic detection of ricin poisoning.