Immunoaffinity removal of xenoreactive antibodies using modified dialysis or microfiltration membranes

2002 ◽  
Vol 81 (2) ◽  
pp. 134-148 ◽  
Author(s):  
Sujatha Karoor ◽  
Jeanette Molina ◽  
Cody R. Buchmann ◽  
Clark Colton ◽  
John S. Logan ◽  
...  
Keyword(s):  
Microfiltration Membranes ◽  
Xenoreactive Antibodies

Purification of cellulase fermentation broth via low cost ceramic microfiltration membranes with nanofibers-like attapulgite separation layers

2017 ◽  
Vol 175 ◽  
pp. 435-442 ◽  
Author(s):  
Xiaomin Yang ◽  
Shouyong Zhou ◽  
Meisheng Li ◽  
Rong Wang ◽  
Yijiang Zhao
Keyword(s):  
Fermentation Broth ◽  
Low Cost ◽  
Microfiltration Membranes ◽  
Separation Layers

scholarly journals Groundwater Remediation of Volatile Organic Compounds Using Nanofiltration and Reverse Osmosis Membranes—A Field Study

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Thomas J. Ainscough ◽  
Darren L. Oatley-Radcliffe ◽  
Andrew R. Barron
Keyword(s):  
Reverse Osmosis ◽  
Groundwater Remediation ◽  
Operating Pressure ◽  
Significant Extent ◽  
Groundwater Samples ◽  
Volatile Organic ◽  
Microfiltration Membranes ◽  
The Subject ◽  
A Site ◽  
Initial Results

Groundwater contamination by chlorinated hydrocarbons represents a particularly difficult separation to achieve and very little is published on the subject. In this paper, we explore the potential for the removal of chlorinated volatile and non-volatile organics from a site in Bedfordshire UK. The compounds of interest include trichloroethylene (TCE), tetrachloroethylene (PCE), cis-1,2-dichloroethylene (DCE), 2,2-dichloropropane (DCP) and vinyl chloride (VC). The separations were first tested in the laboratory. Microfiltration membranes were of no use in this separation. Nanofiltration membranes performed well and rejections of 70–93% were observed for synthetic solutions and up to 100% for real groundwater samples. Site trials were limited by space and power availability, which resulted in a maximum operating pressure of only 3 bar. Under these conditions, the nanofiltration membrane removed organic materials, but failed to remove VOCs to any significant extent. Initial results with a reverse osmosis membrane were positive, with 93% removal of the VOCs. However, subsequent samples taken demonstrated little removal. Several hypotheses were presented to explain this behavior and the most likely cause of the issue was fouling leading to adsorption of the VOCs onto the membrane and allowing passage through the membrane matrix.

scholarly journals Recuperative Amino Acids Separation through Cellulose Derivative Membranes with Microporous Polypropylene Fiber Matrix

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 429
Author(s):  
Aurelia Cristina Nechifor ◽  
Andreia Pîrțac ◽  
Paul Constantin Albu ◽  
Alexandra Raluca Grosu ◽  
Florina Dumitru ◽  
...  
Keyword(s):  
Amino Acids ◽  
Cellulose Acetate ◽  
Polypropylene Fiber ◽  
Point Of View ◽  
Hydroxyethyl Cellulose ◽  
Separation Performance ◽  
Thermal Gravimetric Analyzer ◽  
Microfiltration Membranes ◽  
Ft Ir ◽  
Structural Point

The separation, concentration and transport of the amino acids through membranes have been continuously developed due to the multitude of interest amino acids of interest and the sources from which they must be recovered. At the same time, the types of membranes used in the sepa-ration of the amino acids are the most diverse: liquids, ion exchangers, inorganic, polymeric or composites. This paper addresses the recuperative separation of three amino acids (alanine, phe-nylalanine, and methionine) using membranes from cellulosic derivatives in polypropylene ma-trix. The microfiltration membranes (polypropylene hollow fibers) were impregnated with solu-tions of some cellulosic derivatives: cellulose acetate, 2-hydroxyethyl-cellulose, methyl 2-hydroxyethyl-celluloseand sodium carboxymethyl-cellulose. The obtained membranes were characterized in terms of the separation performance of the amino acids considered (retention, flux, and selectivity) and from a morphological and structural point of view: scanning electron microscopy (SEM), high resolution SEM (HR-SEM), Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectroscopy (EDS) and thermal gravimetric analyzer (TGA). The re-sults obtained show that phenylalanine has the highest fluxes through all four types of mem-branes, followed by methionine and alanine. Of the four kinds of membrane, the most suitable for recuperative separation of the considered amino acids are those based on cellulose acetate and methyl 2-hydroxyethyl-cellulose.

PBAT-based Microfiltration Membranes Using Porogen Saturated Solutions: Architecture, Morphology, and Environmental Profile

2021 ◽  
Author(s):  
Sueli Aparecida de Oliveira ◽  
Paulo Henrique Camani ◽  
Rennan Felix da Silva Barbosa ◽  
Daniel Belchior Rocha ◽  
Sushanta K. Mitra ◽  
...  
Keyword(s):  
Environmental Profile ◽  
Microfiltration Membranes ◽  
Saturated Solutions

scholarly journals Functional Modification of Cellulose Acetate Microfiltration Membranes by Supercritical Solvent Impregnation

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 411
Author(s):  
Irena Zizovic ◽  
Marcin Tyrka ◽  
Konrad Matyja ◽  
Ivana Moric ◽  
Lidija Senerovic ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Ion Beam ◽  
Antibacterial Properties ◽  
Cross Flow ◽  
Batch Mode ◽  
Impregnation Process ◽  
Supercritical Solvent ◽  
Cross Flow Filtration ◽  
Microfiltration Membranes ◽  
The Impact

This study investigates the modification of commercial cellulose acetate microfiltration membranes by supercritical solvent impregnation with thymol to provide them with antibacterial properties. The impregnation process was conducted in a batch mode, and the effect of pressure and processing time on thymol loading was followed. The impact of the modification on the membrane’s microstructure was analyzed using scanning electron and ion-beam microscopy, and membranes’ functionality was tested in a cross-flow filtration system. The antibiofilm properties of the obtained materials were studied against Staphyloccocus aureus and Pseudomonas aeruginosa, while membranes’ blocking in contact with bacteria was examined for S. aureus and Escherichia coli. The results revealed a fast impregnation process with high thymol loadings achievable after just 0.5 h at 15 MPa and 20 MPa. The presence of 20% of thymol provided strong antibiofilm properties against the tested strains without affecting the membrane’s functionality. The study showed that these strong antibacterial properties could be implemented to the commercial membranes’ defined polymeric structure in a short and environmentally friendly process.

scholarly journals Fabrication and Optimization of a Lipase Immobilized Enzymatic Membrane Bioreactor based on Polysulfone Gradient-Pore Hollow Fiber Membrane

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 495 ◽  
Author(s):  
Peng-Cheng Chen ◽  
Zhen Ma ◽  
Xue-Yan Zhu ◽  
Da-Jing Chen ◽  
Xiao-Jun Huang
Keyword(s):  
Hollow Fiber ◽  
High Performance ◽  
Hollow Fiber Membrane ◽  
Candida Rugosa ◽  
Operational Parameters ◽  
Membrane Pore ◽  
Microfiltration Membranes ◽  
Glycerol Triacetate ◽  
Operation Pressure ◽  
Enzymatic Membrane

Enzymatic membrane bioreactors (EMBRs) possess the characteristic of combining catalysis with separation, and therefore have promising application potentials. In order to achieve a high-performance EMBR, membrane property, as well as operating parameters, should give special cause for concerns. In this work, an EMBR based on hollow fiber polysulfone microfiltration membranes with radial gradient pore structure was fabricated and enzyme immobilization was achieved through pressure-driven filtration. Lipase from Candida rugosa was used for immobilization and EMBR performance was studied with the enzymatic hydrolysis of glycerol triacetate as a model reaction. The influences of membrane pore diameter, substrate feed direction as well as operational parameters of operation pressure, substrate concentration, and temperature on the EMBR activity were investigated with the production of hydrolysates kinetically fitted. The complete EMBR system showed the highest activity of 1.07 × 104 U⋅g−1. The results in this work indicate future efforts for improvement in EMBR.

A three mechanism model to describe fouling of microfiltration membranes

2006 ◽  
Vol 280 (1-2) ◽  
pp. 856-866 ◽  
Author(s):  
Chase Duclos-Orsello ◽  
Weiyi Li ◽  
Chia-Chi Ho
Keyword(s):  
Mechanism Model ◽  
Microfiltration Membranes
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