Zeta potential of bone from particle electrophoresis: solution composition and kinetic effects

The morphology of bone may be influenced by many factors, including electromechanical ones such as electric potentials, electric fields, or zeta potentials. Stress-generated potential studies in bone and particle electrophoresis studies using calcium-deficient hydroxyapatite have shown that the zeta...

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Bibliographic Details
Published inJournal of biomedical materials research Vol. 29; no. 1; p. 47
Main Authors Kowalchuk, R M, Pollack, S R, Corcoran, T A
Format Journal Article
LanguageEnglish
Published United States 01.01.1995
Subjects
Adsorption
Animals
Bone and Bones - chemistry
Calcium - chemistry
Cattle
Collagen - chemistry
Electrochemistry
Electrophoresis
Female
Fluorides - chemistry
In Vitro Techniques
Kinetics
Male
Minerals - chemistry
Models, Biological
Particle Size
Solutions
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Summary:The morphology of bone may be influenced by many factors, including electromechanical ones such as electric potentials, electric fields, or zeta potentials. Stress-generated potential studies in bone and particle electrophoresis studies using calcium-deficient hydroxyapatite have shown that the zeta potential depends on the composition of the steeping fluid and steeping time. To better quantify and understand these in situ potential changes in bovine cortical bone, the effects of alterations in calcium, phosphate, and fluoride concentrations in Neuman's Fluid (NF), which simulates in vivo bone extracellular fluid, were investigated using particle electrophoresis. The zeta potential increased in magnitude with increased calcium concentration in NF in as little as 17 min. Increasing phosphate concentration in NF also increased the zeta potential magnitude. These results provide support for a structural model of the bone matrix surface-bone fluid interface, which incorporates the bone surface proper (composed of collagen, mineral, and boundary regions), stationary layer (in which ions, ionic complexes, and proteins may be adsorbed), and bone extracellular fluid. These results, coupled with those of previous studies, indicate that the protein phase probably has an important role in the determination of the physiologic zeta potential; the role of the mineral phase may also be important.
ISSN:0021-9304
DOI:10.1002/jbm.820290108