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Updated: Oct 5, 2026

Physical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells

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Evaluation of spore extraction and purification methods for selective recovery of viable Bacillus anthracis spores

D C Dragon¹, R P Rennie

¹Medical Microbiology and Immunology, 2B3.08 Walter C. Mackenzie Health Sciences Centre, University of Alberta Hospital, 8440-112 Street, Edmonton, Alberta, Canada T6G 2JZ. dcdragon@internorth.com

Letters in Applied Microbiology

|July 27, 2001

Abstract

Aims:

To investigate methods of improving anthrax spore detection with PLET.

Methods And Results:

Comparisons were made of PLET and blood-supplemented PLET to recover and distinguish spores of a variety of Bacillus species. Heat and ethanol purification of spores, and spore extraction from soil with water and high specific gravity sucrose plus non-ionic detergent, were also carried out.

Conclusion:

PLET was more selective and suitable than blood-supplemented PLET for detection of anthrax spores in the environmental specimens. However, PLET is not an optimal spore recovery medium. Purification of spores with ethanol was as effective as heat purification. High specific gravity sucrose plus detergent extraction solutions may be more sensitive than extraction with water.

Significance And Impact Of The Study:

This study highlights shortcomings with the standard PLET isolation of anthrax spores and describes ways in which the procedure may be improved.

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Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens

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