Preparation of Bacterial Magnetite Particles for DNA Carriers

Haruko Takeyama, Satoko Kudo, Koji Sode, Moriyuki Nakamura, Tadashi Matsunaga

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have investigated the application of bacterial magnetite particles as DNA carriers for microprojectile based gene transfer. The magnetic bacterium, Aquaspirillum sp. AMB-1, can grow aerobically to high cell densities, allowing high yields of bacterial magnetite particles to be sonicated. The optimum sonication conditions were determined and found to be dependent on culture age. Excessive sonication damaged the magnetosome membrane surrounding magnetite particles. This decreased dispersion resulted in a reduced surface area available for DNA adsorption. When compared with gold, tungsten and non membrane coated magnetite, membrane coated magnetite was a better material for DNA binding (5 μg DNA/mg magnetite). The greatest amount of DNA was bound following treatment of membrane coated magnetite with glutaraldehyde-triamine prior to incubation with DNA.

Original languageEnglish
Pages (from-to)319-325
Number of pages7
Issue number5
Publication statusPublished - 1991 May
Externally publishedYes


  • Aquaspirillum
  • Bacterial Magnetite
  • DNA Adsorption
  • DNA Carrier
  • Magnetic Bacterium

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics


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