African Journal of

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12306

Full Length Research Paper

Comparative study of methods for extraction and purification of environmental DNA from high-strength wastewater sludge

Meisam Tabatabaei1,4*, Mohd Rafein Zakaria1, Raha Abdul Rahim2, Norhani Abdullah3 andré-Denis G. Wright5, Yoshihito Shirai6, Mehdi Shamsara7, Kenji Sakai8 and Mohd Ali Hassan1
1Department of Bioprocess Technology, Universiti Putra Malaysia 43400 Serdang, Selangor, Malaysia. 2Department of Cell and Molecular Biology, Universiti Putra Malaysia 43400 Serdang, Selangor, Malaysia. 3Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences,Universiti Putra Malaysia 43400 Serdang, Selangor, Malaysia. 4Microbial Biotechnology and Biosafety Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Seed and Plant Improvement Institute's Campus, 31535-1897, Mahdasht Road, Karaj, Iran. 5Department of Animal Science, University of Vermont, Burlington, VT, USA. 6Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4Hibikino, Wakamatsu-ku, Kitakyushu 808-0196, Japan. 7National Institute for Genetic Engineering and Biotechnology, 14155-6343, Tehran, Iran. 8Labroratory of Soil Microorganisms, Department of Plant Resources, Graduate School of Bioresources and Bioenvironmental Sciences, Kyushu University, 6-10-10Hakozaki, Higashi-ku, Fukuoka, Japan, 812-8581.
Email: [email protected]

  •  Accepted: 17 May 2010
  •  Published: 31 August 2010


DNA extraction from wastewater sludge (COD 50000 and BOD 25000 mg/l) was conducted using nine different methods normally used for environmental samples including a procedure used in this study and the results obtained were compared. The quality of the differently extracted DNAs was subsequently assessed by measuring humic acid concentration, cell lysis efficiency, polymerase chain reaction (PCR) amplification of methanogenic and eubacterial 16S rDNA. The protocol developed in this study was further evaluated by extracting DNA from various high-strength wastewater sludge samples, denaturing gradient gel electrophoresis (DGGE) and fluorescent in situ hybridization (FISH) analyses. The results revealed that great differences existed among the nine procedures and only a few produced satisfactory results when applied to high-strength wastewater sludge. Thermal shock alone was shown inefficient to disrupt the methanogenic cell wall to release the DNA. The method presented in this study (Procedure 9) is generally recommended because of the low concentration of contaminants and its high efficiency despite its simplicity.


Key words: High-strength wastewater sludge, DNA extraction, environmental samples, humic acids, denaturing gradient gel electrophoresis, fluorescent in situhybridization.