In situ preparation of colloidal iron by microwave irradiation for transmission electron microscopy

Satoru Nakatani, Ichiro Naito, Ryusuke Momota, Noriko Hinenoya, Kanji Horiuchi, Keiichiro Nishida, Aiji Ohtsuka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We attempted to prepare colloidal iron within tissues by means of microwave irradiation. Mouse tissue blocks were fixed with a mixture of paraformaldehyde and ferric chloride in a cacodylate buffer, immersed in a cacodylate buffered ferric chloride solution, and irradiated in a microwave processor. Colloidal iron was prepared within tissues or cells, and was observed in the form of electron dense fine granules (1-2 nm in diameter) by transmission electron microscopy. Collagen fibrils in the connective tissue showed colloidal iron deposition at regular periodical intervals. Cells in the splenic tissue showed that fine colloidal granules were deposited on the ribosomes but not on the nuclear chromatin. This finding suggests that ferric ions could not diffuse into the nucleus, which was surrounded by the nuclear envelope. The podocyte processes of the renal glomerulus were stained diffusedly. Though this microwave in situ colloidal iron preparation method has some limitations, it is convenient for use in biomedical specimen preparation in transmission electron microscopy. Copyright

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalActa medica Okayama
Issue number1
Publication statusPublished - Feb 2006


  • Colloidal iron
  • Histochemistry
  • Microwave
  • Transmission electron microscopy

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology


Dive into the research topics of 'In situ preparation of colloidal iron by microwave irradiation for transmission electron microscopy'. Together they form a unique fingerprint.

Cite this