title: Evaluation of spore extraction and purification methods for selective recovery of viable Bacillus anthracis spores.
abstract: OBJECTIVE
  To investigate methods of improving anthrax spore detection with PLET.
  
  
  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.
  
  
  CONCLUSIONS
  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.
  
  
  CONCLUSIONS
  This study highlights shortcomings with the standard PLET isolation of anthrax spores and describes ways in which the procedure may be improved.
authors.affiliation: Medical 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
authors.forename: D C
authors.initials: DC
authors.lastname: Dragon
authors.forename: R P
authors.initials: RP
authors.lastname: Rennie
mesh_terms: D001408:Bacillus anthracis / Q000166:cytology / Q000254:growth & development* / Q000302:isolation & purification*; D002455:Cell Division; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D004492:Edetic Acid / Q000378:metabolism; D000431:Ethanol; D006358:Hot Temperature; D009113:Muramidase / Q000378:metabolism; D009942:Organometallic Compounds / Q000378:metabolism; D011092:Polyethylene Glycols; D011113:Polymyxins / Q000378:metabolism; D012680:Sensitivity and Specificity; D012988:Soil Microbiology; D013171:Spores, Bacterial / Q000166:cytology / Q000254:growth & development* / Q000302:isolation & purification*; D013395:Sucrose; D014867:Water
chemical_list: D003470:Culture Media; D009942:Organometallic Compounds; D011113:Polymyxins; D014867:Water; D000431:Ethanol; D011092:Polyethylene Glycols; D013395:Sucrose; D004492:Edetic Acid; D009113:Muramidase; C026995:thallium acetate