Monopolar surfaces

Oss, Carel J. van; Chaudhury, Manoj K.; Good, Robert J.

doi:10.1016/0001-8686(87)80008-8

Cited by 849 publications

(592 citation statements)

References 39 publications

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“…This led to differences in the acid/base parts of the surface free energies and therefore also in the total surface free energies. The lower values of 7t,,, compared with 7b were owing to the fact that in the method of van Oss et al (17,18), the spreading pressure (~e) is considered to be zero.…”

Section: Microbial Adhesion To Hydrocarbon (Math)mentioning

confidence: 99%

“…This approach has proven to be valid for low energy surfaces and for high energy surfaces on which spreading pressures may become significant (16). The second approach has been developed by Van Oss et al (17,18) who extended Eq. 1 in an attempt to obtain data from contact angles that would give more information about the polar groups at a surface.…”

Section: Contact Angles and Surface Free Energiesmentioning

confidence: 99%

“…Surface free energies were calculated according to the methods of Busscher et al (13) and Van Oss et al (17,18). There is a good linear relation (r ---0.97) between the polar component (~') of the surface free energy according to Busscher et al (13) and the electron-donor part (yz) of the acid/base component of the surface free energy according to van Oss et al (17,18) (Fig.…”

Section: Cell Biophysicsmentioning

confidence: 99%

“…2. Relation between the electron-donor parameter (y-) of the surface free energy of the eight E. coli strains based on the concept of Lifshitz-van der Waals and acid/base surface free energy components (17,18), and the polar part (TP) of the surface free energy based on the concept of dispersion and polar surface free energy components (13). Fig.…”

Section: Cell Biophysicsmentioning

confidence: 99%

“…3. Relation between the acid/base component of the surface free energy of the eight E. coli strains based on the concept of Lifshitz-van der Waais and acid/base surface free energy components (17,18), and the zeta potentials at pH = 7.4. from 0.026 to 0.085 (Table 4). The AmI/CH ratio as determined with IR varied more than the AmII/CH ratio possibly because of differences in the content of unsaturated aldehydes and ketones in the cell wall causing fluctuations in the AmI/CH ratio, but not in the AmII/CH ratio.…”

Section: Cell Biophysicsmentioning

confidence: 99%

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Physicochemical characterization ofEscherichia coli

et al. 1992

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Eight Escherichia coli strains were characterized by determining their adhesion to xylene, surface free energy, zeta potential, relative surface charge, and their chemical composition. The latter was done by applying X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy OR). No relationship between the adhesion to xylene and the water contact angles of these strains was found. Three strains had significantly lower surface free energies than the other strains. Surface free energies were either obtained from polar and dispersion parts or from Lifshitz-van der Waals and acid/base parts of the surface free energy. A correlation (r = 0.97) between the polar parts and the electron-donor contributions to the acid/base part of the surface free energy was found. The zeta potentials of all strains, measured as a function of pH *Author to whom all correspondence and reprint requests should be addressed. Cell Biophysics 1 7Volume 20, 1992 18Harkes et al.(2-11), were negative. Depending on the zeta potential as a function of pH, three groups were recognized among the strains tested. A relationship (r = 0.84) was found between the acid/base component of the surface free energy and the zeta potential measured at pH = 7.4. There was no correlation between results of XPS and IR studies. Data from the literature of XPS and IR studies of the gram-positive staphylococci and streptococci were compared with data from the gram-negative E. coli used in this study. It appeared that in these three groups of bacteria, the polysaccharide content detected by IR corresponded well with the oxygen-to-carbon ratio detected by XPS.

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Section: Microbial Adhesion To Hydrocarbon (Math)mentioning

confidence: 99%

Section: Contact Angles and Surface Free Energiesmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

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Physicochemical characterization ofEscherichia coli

et al. 1992

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Staphylococcus epidermidis adhesion to films deposited from hydroxyethylmethacrylate plasma

Morra

Cassinelli

1996

J. Biomed. Mater. Res.

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The adhesion of S. epidermidis ATCC 35984 strain on polystyrene (PS) disks coated by films deposited from hydroxyethylmethacrylate (HEMA) plasma was evaluated and compared to adhesion on untreated PS and oxygen-plasma-treated PS. Films were deposited keeping constant the monomer flow rate while the discharge power ranged from 40-100 W in order to obtain coating with different surface properties. Surface chemistry, energetics, and morphology were evaluated by Electron Spectroscopy for Chemical Analysis (ESCA), contact angle measurement, and Atomic Force Microscopy (AFM), respectively. Bacteria adhered more to the plasma-deposited or plasma-treated surfaces than to untreated PS, but no significant difference was recorded among the samples obtained using different deposition conditions. According to the surface energetic analysis, plasma-deposited and plasma-treated surfaces bear a strong Lewis-base character, so it is possible to hypothesize a marked contribution of electron donor-electron acceptor interactions to the mechanism(s) controlling adhesion between synthetic and bacterial surfaces.

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Kinetics and Energetics of Specific Intermolecular Interactions

Oss

1997

J. Mol. Recognit.

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Taking into account the energy vs. distance functions of the aspecific (macroscopic) repulsion that usually prevails between antigen (Ag) and antibody (Ab) molecules in polar media, as well as the specific (microscopic) attraction between epitope and paratope of Ag and Ab, it proved possible to determine the kinetic constants (von Smoluchowski, 1917; Hammes, 1978) of Ag-Ab interactions, from the surface properties of Ag, Ab and the aqueous medium. The kinetic constants thus found correlate well with experimentally determined kinetic constants in comparable systems, and confirm the importance of the influence of the concentration of one of the reagents (e.g. the Ab) on the kinetic association constant (Van Regenmortel et al., 1994), which is largely due to steric hindrance. Applying the same energy vs. distance approach to the influence of temperature (T) on Ag-Ab reactions, it ensues that the familiar occurrence of an apparent 'enthalpy-entropy compensation' in aqueous media is in fact the relatively gratuitous outcome of a complex set of effects caused by an increase in T, on the total free energy, the hydration energy and, as a result, on the inter-epitope-paratope distance. A close correlation exists between the outcome of these surface-thermodynamic analyses and experimental results.

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Monopolar surfaces

Cited by 849 publications

References 39 publications

Physicochemical characterization ofEscherichia coli

Physicochemical characterization ofEscherichia coli

Staphylococcus epidermidis adhesion to films deposited from hydroxyethylmethacrylate plasma

Kinetics and Energetics of Specific Intermolecular Interactions

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