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In vitro production of Clostridium perfringens enterotoxin and its detection by reversed passive hemagglutination
Abstract:
The reversed passive hemagglutination (RPHA) test yielded a positive reaction in 2 h with as little as 0.5 ng of purified Clostridium perfringens enterotoxin (CPE) per ml as well as with cultures of some C. perfringens grown in Duncan-Strong (DS) medium. This method is the most sensitive, the simplest, and the fastest among all reported. The time course of CPE production of Clostridium perfringens NCTC 8798 in DS was investigated by RPHA. CPE in culture was detectable at 4 h, increased gradually, reached a maximum at 12 to 14 h, and remained at a high level of 20 mug/ml through 48 h of incubation. CPE synthesized within cells is released easily by sonic disruption of young cultures and by aging the cultures 20 h or more. Heat shock of the cell inoculum was essential for CPE production by C. perfringens in DS.
Insights
A new reversed passive hemagglutination (RPHA) test detects Clostridium perfringens enterotoxin (CPE) rapidly and sensitively. Heat shock is crucial for CPE production in specific culture conditions.
Area of Science:
- Microbiology
- Food Safety
- Immunology
Background:
- Clostridium perfringens is a significant foodborne pathogen.
- Accurate and rapid detection of its enterotoxin (CPE) is crucial for public health.
- Existing detection methods can be time-consuming or lack sensitivity.
Purpose of the Study:
- To develop and validate a highly sensitive, simple, and rapid assay for Clostridium perfringens enterotoxin (CPE).
- To investigate the kinetics of CPE production by Clostridium perfringens in a specific culture medium.
- To identify optimal conditions for CPE synthesis and release.
Main Methods:
- Development of a reversed passive hemagglutination (RPHA) test for CPE detection.
- Testing the RPHA assay with purified CPE and bacterial cultures.
- Monitoring CPE production over time in Clostridium perfringens NCTC 8798 cultures using RPHA.
- Investigating the effect of heat shock on the cell inoculum for CPE production.
Main Results:
- The RPHA test detected as little as 0.5 ng/ml of purified CPE within 2 hours.
- CPE was detectable in cultures at 4 hours, peaking at 12-14 hours, and remaining high for 48 hours.
- Heat shock of the inoculum was essential for CPE production.
Conclusions:
- The RPHA test is a highly sensitive, simple, and rapid method for detecting Clostridium perfringens enterotoxin.
- Optimal CPE production requires heat shock of the inoculum and specific culture conditions.
- This assay significantly advances the timely identification of CPE in diagnostic and food safety applications.