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1984). Thus, in this study, per cent recovery predominantly reflected efficiency http://www.selleck.cn/products/JNJ-26481585.html in spore lysis. Although each kit differs in extraction procedure, many of the kits employ some form of bead beating as the method of cell disruption. Bead beating has been shown as one of the most effective techniques in cell disruption (Miller et?al. 1999). Bacillus spores, however, possess a resistant spore coat that may be difficult to lyse, limiting the release of nucleic acid (Priha et?al. 2004; Dauphin et?al. 2009). Because of this protective coat, additional methods such as chemical lysis, bead mill homogenization, and hot-detergent treatment have been suggested to improve spore lysis (Zhou et?al. 1996; Kuske et?al. 1998; Ryu et?al. 2003; Saikaly et?al. 2007). Recently, Guidi et?al. (2010) increased lysis and the amount of DNA extracted from Bacillus thuringiensis spores by introducing a germination step prior to chemical and mechanical lysis. This germination step involved treatment with DNase I, heat shock, and the addition of tryptic soy broth to seeded soil samples. Studies have also indicated that performing successive extractions on a single sample may also enhance cell lysis and increase DNA yield (Feinstein et?al. 2009). In addition to efficiency in extraction and purification from various soils, other http://www.selleckchem.com/products/epz-6438.html factors such as processing time, cost, and sample size should also be considered in the selection of an appropriate extraction kit. The IT 1-2-3 Platinum Path? Kit required the least amount of processing time ( http://www.selleckchem.com/products/PD-0325901.html not require any additional equipment, and might therefore be considered by laboratories hoping to limit extraction procedure costs. Although soil sample size may be an important consideration, particularly when the concentration of a target micro-organism is low, all of the DNA extraction kit manufacturers suggest processing replicate soil samples in parallel and then pooling the purified DNA to process larger soil samples. In the incident of a bioterrorism attack or outbreak, pathogen inactivation is yet another factor to consider in the selection of an extraction method. All six kits produced DNA extracts free of any viable B.?cereus spores. However, viable spores were present in many of the preceding procedural steps, necessitating appropriate precaution when processing potentially pathogenic samples. The results of this study suggest that commercially available extraction kits can be used, with varying success, to extract amplifiable DNA from bacterial spores in soil. Paired with a target-specific real-time PCR assay, a commercial DNA extraction kit has the potential to expedite sample processing and pathogen detection following an anthrax outbreak or bioterrorism attack.