X-ray photoelectron spectroscopy studies on adsorption of amino acids fromaqueous solutions onto oxidised titanium surfaces

Authors
Citation
M. Schmidt, X-ray photoelectron spectroscopy studies on adsorption of amino acids fromaqueous solutions onto oxidised titanium surfaces, ARCH ORTHOP, 121(7), 2001, pp. 403-410
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ortopedics, Rehabilitation & Sport Medicine
Journal title
ARCHIVES OF ORTHOPAEDIC AND TRAUMA SURGERY
ISSN journal
0936-8051 → ACNP
Volume
121
Issue
7
Year of publication
2001
Pages
403 - 410
Database
ISI
SICI code
0936-8051(200107)121:7<403:XPSSOA>2.0.ZU;2-D
Abstract
Osseointegration is concerned with processes at the cellular level. However , the titanium surface is also capable of interactions with organic structu res at the molecular level. These properties of titanium are presented from a physicochemical viewpoint. Adsorption experiments are described that sho uld simulate molecular processes in the organism. The selected model substa nces, amino acids, were adsorbed from aqueous saline solutions with various pH values onto evaporated titanium layers. The evidence of adsorbates was determined by photoelectron spectroscopy. The pH values at which adsorption occurred, the binding energies and signal intensities according to curve f it allow conclusions to be drawn from the adsorption reactions. Thus, the t itanium surface preferentially forms a surface complex with the carboxyl gr oups of the amino acids in an acidic solution. The resulting positions of t he adsorbed molecules can be confirmed through evaluation of the line inten sities. The results show clearly that there is chemical bonding between the titanium surface and the organic substances. Assuming that a comparable si tuation occurs in the organism, such processes or similar ones can be viewe d as preliminary stages of osseointegration.