title: A simple and rapid method for extracting bacterial DNA from intestinal microflora for ERIC-PCR detection.
abstract: OBJECTIVE
  To develop a simple and convenient method for extracting genomic DNA from intestinal microflora for enterobacterial repetitive intergenic consensus (ERIC)-PCR detection.
  
  
  METHODS
  Five methods of extracting bacterial DNA, including Tris-EDTA buffer, chelex-100, ultrapure water, 2% sodium dodecyl sulfate and 10% Triton-100 with and without sonication, were compared with the commercial fecal DNA extraction kit method, which is considered as the gold standard for DNA extraction. The comparison was based on the yield and purity of DNA and the indexes of the structure and property of micro-organisms that were reflected by ERIC-PCR.
  
  
  RESULTS
  The yield and purity of DNA obtained by the chelex method was similar to that obtained with the fecal DNA kit. The ERIC-PCR results obtained for the DNA extracted by the chelex method and those obtained for DNA extracted with the fecal DNA kit were basically the same.
  
  
  CONCLUSIONS
  The chelex method is recommended for ERIC-PCR experiments in view of its simplicity and cost-effectiveness; and it is suitable for extracting total DNA from intestinal micro-organisms, particularly for handling a large number of samples.
authors.affiliation: Avian Diseases Research Center, College of Veterinary Medicine of Sichuan Agricultural University, Yaan 625014, Sichuan Province, China.
authors.forename: Jin-Long
authors.initials: JL
authors.lastname: Yang
authors.forename: Ming-Shu
authors.initials: MS
authors.lastname: Wang
authors.forename: An-Chun
authors.initials: AC
authors.lastname: Cheng
authors.forename: Kang-Cheng
authors.initials: KC
authors.lastname: Pan
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Li
authors.forename: Shu-Xuan
authors.initials: SX
authors.lastname: Deng
mesh_terms: D000818:Animals; D016172:DNA Fingerprinting / Q000379:methods; D004269:DNA, Bacterial / Q000032:analysis*; D004755:Enterobacteriaceae / Q000235:genetics*; D005243:Feces / Q000737:chemistry*; D005777:Geese; D007422:Intestines / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods*
chemical_list: D004269:DNA, Bacterial