Methods for measurement of charge in collagen and polyelectrolyte composite materials

Picheny, Michael; Grodzinsky, Alan J.

doi:10.1002/bip.1976.360150918

Biopolymers

1976

DOI: 10.1002/bip.1976.360150918

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Methods for measurement of charge in collagen and polyelectrolyte composite materials

Michael Picheny

Alan J. Grodzinsky

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1977

1985

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Cited by 8 publications

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“…However, intrafibrillar volume did decrease slightly with increasing temperature (14). Grodzinsky et al (8,9,26,30,33) demonstrated lateral fibril swelling and increased water content as the collagen fibrils became charged at acidic and base pH values (4). Grynpas et al (10) measured a 2 A increase in intermolecular separation in Type I1 cartilage collagen relative to Type I, which corresponded to a 30% increase in intrafibrillar volume.…”

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Influence of cartilage conformation on its equilibrium water partition

Pa¹

1985

Journal Orthopaedic Research

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The spatial and bulk water equilibrium partition and fluid content were determined for normal adult bovine articular cartilage as a function of pH, temperature, and geometric confinement. Water partition averaged 60 +/- 7% at neutral pH and 37 degrees C and increased with decreasing pH and increasing temperature without a concomitant change in fluid content. The variation in water partition appeared to be a result of local conformation changes in the collagen fibril ultrastructure causing a transfer between free and trapped water volume. Removal of the lateral and subchondral bone geometric constraints caused an increase in both the water partition and fluid content. However, this partition variation could be accounted for solely from a change in free fluid volume without a change in the trapped fluid volume. These results suggest that in articular cartilage the proteoglycan-collagen interaction may be an important mechanism for controlling the partition of water between a freely exchangeable space and a space allowing no fluid exchange.

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Influence of cartilage conformation on its equilibrium water partition

Pa¹

1985

Journal Orthopaedic Research

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Contribution of electrodiffusion to the dynamics of electrically stimulated changes in mechanical properties of collagen membranes

Shoenfeld

Grodzinsky

1980

Biopolymers

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SynopsisWe have studied the kinetics of oscillatory tensile forces in collagen membranes. These forces were generated by sinusoidal electric fields applied across the membrane. Both the magnitude and phase of the measured force changed with frequency over a three-decade range. The membrane-separated electrolyte baths had different ionic strength but identical nonisoelectric pH. Changes in intramembrane ionic strength due to the electric field were calculated over the same frequency range via an electrodiffusion model that was generalized to include convection and electrokinetic coupling. A comparison of the experimental and theoretical phases and amplitudes versus frequency suggests that electrodiffusion is the dominant rate-limiting process in this electromechanochemical transduction. These results are relevant to electrostatic interactions in connective tissues and to membrane-based filtration devices in which membrane permeability may be actively varied and controlled by an applied electric field.

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Polyelektrolytkomplexe — Bildungsweise, Struktur und Anwendungsmöglichkeiten

Philipp

Dawydoff

Linow

1982

Zeitschrift fuer Chemie

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Methods for measurement of charge in collagen and polyelectrolyte composite materials

Cited by 8 publications

References 7 publications

Influence of cartilage conformation on its equilibrium water partition

Influence of cartilage conformation on its equilibrium water partition

Contribution of electrodiffusion to the dynamics of electrically stimulated changes in mechanical properties of collagen membranes

Polyelektrolytkomplexe — Bildungsweise, Struktur und Anwendungsmöglichkeiten

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