Composition of surface oxide film of titanium with culturing murine fibroblasts L929.
Changes in the composition of surface oxide film on titanium specimens in the presence of amino acids, serum proteins, and cells were characterized using X-ray photoelectron spectroscopy. The surface oxide film on titanium formed in the air is so protective that the further oxidation of titanium is prevented in various circumstances. During immersion of the specimen in Hanks' solution, Eagle's minimum essential medium (MEM), and MEM with the addition of fetal bovine serum (MEM+FBS), calcium phosphate precipitated, causing the increase in thickness of the surface oxide film. Calcium phosphate was also precipitated with culturing murine fibroblast L929, but the amount of the calcium phosphate was smaller than those in Hanks' solution, MEM, and MEM+FBS. The relative concentration ratio of calcium to phosphorous, [Ca]/[P], increased with proteins charging negatively, while the ratio decreased with the cells whose extracellular matrix charging positively. In addition, sulfur precipitated as S(0) and/or S(2-) only with culturing the cells. Sulfate ions in the MEM+FBS are reduced at the interface between titanium and the solution with the existence of cells.
Hiromoto
Sachiko
S
Biomaterials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. hiromoto.sachiko@nims.go.jp
Hanawa
Takao
T
Asami
Katsuhiko
K
D000327:Adsorption; D000596:Amino Acids / Q000737:chemistry; D000818:Animals; D002130:Calcium Phosphates / Q000737:chemistry* / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D002455:Cell Division / Q000502:physiology; D002460:Cell Line; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D005347:Fibroblasts / Q000502:physiology*; D007552:Isotonic Solutions / Q000737:chemistry*; D008422:Materials Testing; D051379:Mice; D011506:Proteins / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000596:Amino Acids; D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; C072670:Hanks Balanced Salt Solution; D007552:Isotonic Solutions; D011506:Proteins; C009495:titanium dioxide; D012710:Serum Albumin, Bovine; C020243:calcium phosphate; D014025:Titanium