Semicrystalline poly(vinyl alcohol) ultrafiltration membranes for bioseparations

Amanda, Aurelia

doi:10.1016/s0376-7388(00)00433-6

Cited by 43 publications

(20 citation statements)

References 12 publications

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“…Benign techniques are required in biotechnology and food applications because most cross-linking agents are toxic, and unreacted cross-linking agents can be harmful when they leach out. Heat-treatment is an excellent alternative to chemical cross-linking because the technique is simple and membrane selectivities can be easily controlled by varying the conditions of annealing (32). Heat-treated PVA membranes also allow faster microsolute transport than PVA membranes prepared by the freezing/thawing technique (28).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Protein Fouling on Heat-Treated Poly(vinyl alcohol), Poly(ether sulfone) and Regenerated Cellulose Membranes Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy

Amanda

Mallapragada

2001

Biotechnol. Prog.

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Poly(vinyl alcohol) (PVA) membranes for ultrafiltration were fabricated by heat-treatment to separate macromolecules from microsolutes. PVA is a hydrophilic polymer with good mechanical properties because of its semicrystalline structure. The membranes were heat-treated at 100 degrees C for 1 h to increase their crystallinity and thereby their mechanical strength. The mechanical strength of the membranes was evaluated using a dynamic mechanical analyzer by measuring their compressive and tensile moduli. Membrane selectivities and protein fouling of heat-treated PVA membranes were compared to the commercial poly(ether sulfone) (PeS) and regenerated cellulose membranes. Myoglobin from horse skeletal muscle was used as a model protein, and L-tryptophan was used as a model microsolute. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to identify protein fouling on the surfaces of these membranes under flow and nonflow conditions. It was found from the selectivity and DRIFTS studies that PVA membranes were more resistant to fouling than regenerated cellulose and PeS membranes.

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Section: Introductionmentioning

confidence: 99%

Comparison of Protein Fouling on Heat-Treated Poly(vinyl alcohol), Poly(ether sulfone) and Regenerated Cellulose Membranes Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy

Amanda

Mallapragada

2001

Biotechnol. Prog.

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“…It has been widely used in fermentation industry, organic wastewater treatment, and other fields. Modified PVA has been reported to have high potential for the adsorption of metal ions [17][18][19]. To improve its adsorption capacity and enhance the adsorption rate, the design and exploration of novel adsorbents are necessary.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Removal of Cd(II) and Pb(II) from aqueous solutions by modified polyvinyl alcohol

Jiang

Qi-guo

Zeng

2016

Desalination and Water Treatment

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In this study, modified polyvinyl alcohol (PVA) was prepared and characterized by element analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and surface area and proximity analysis. The isotherms and thermodynamic parameters of the modified PVA adsorption process were estimated. The data indicate that the adsorption process is exothermic, feasible, spontaneous, and fit to the Langmuir isotherm model. The maximum adsorption capacities for Cd(II) and Pb(II) were calculated to be 1.19 and 1.48 mmol/g, respectively. Sorption was rapid, with the removal percentage higher than 98% after 10 min. Adsorption behavior mechanisms were analyzed using pseudo-first-order and pseudo-second-order models, which were highly fitted to pseudosecond-order model. This suggests the main adsorption mechanism is a chemical adsorption, involving ion exchange and valence forces through sharing or exchange of electrons between metal ions and modified PVA. The modified PVA is a good reusable sorbent, enhancing the economics of practical application for the removal of Cd(II) and Pb(II) from water and wastewater.

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“…The interaction of proteins with material surfaces is important in many applications including the biocompatibility of implant biomaterials, 1-3 drug delivery systems, 4,5 biosensors, 6,7 surfaces for bioseparation, 8 and biodefense. [9][10][11][12] A fundamental understanding of the molecular-level events accompanying protein-surface interactions is necessary to support the knowledge-based design of material surfaces for these applications.…”

Section: Introductionmentioning

confidence: 99%

Parameterization of an interfacial force field for accurate representation of peptide adsorption free energy on high-density polyethylene

et al. 2015

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Interfacial force field (IFF) parameters for use with the CHARMM force field have been developed for interactions between peptides and high-density polyethylene (HDPE). Parameterization of the IFF was performed to achieve agreement between experimental and calculated adsorption free energies of small TGTG-X-GTGT host-guest peptides (T = threonine, G = glycine, and X = variable amino-acid residue) on HDPE, with ±0.5 kcal/mol agreement. This IFF parameter set consists of tuned nonbonded parameters (i.e., partial charges and Lennard-Jones parameters) for use with an in-house-modified CHARMM molecular dynamic program that enables the use of an independent set of force field parameters to control molecular behavior at a solid-liquid interface. The R correlation coefficient between the simulated and experimental peptide adsorption free energies increased from 0.00 for the standard CHARMM force field parameters to 0.88 for the tuned IFF parameters. Subsequent studies are planned to apply the tuned IFF parameter set for the simulation of protein adsorption behavior on an HDPE surface for comparison with experimental values of adsorbed protein orientation and conformation.

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Semicrystalline poly(vinyl alcohol) ultrafiltration membranes for bioseparations

Cited by 43 publications

References 12 publications

Comparison of Protein Fouling on Heat-Treated Poly(vinyl alcohol), Poly(ether sulfone) and Regenerated Cellulose Membranes Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy

Comparison of Protein Fouling on Heat-Treated Poly(vinyl alcohol), Poly(ether sulfone) and Regenerated Cellulose Membranes Using Diffuse Reflectance Infrared Fourier Transform Spectroscopy

Removal of Cd(II) and Pb(II) from aqueous solutions by modified polyvinyl alcohol

Parameterization of an interfacial force field for accurate representation of peptide adsorption free energy on high-density polyethylene

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