Performance of PS/PIMA/PPEES Nanofiltration Membranes before and after Alkali Treatment for Filtration of CaCl2 and NaCl

Present article describes about the preparation of Nanofiltration (NF) composite membranes by a simple chemical treatment to the polymeric membrane composed of Poly (isobutylene-alt-maleic anhydride). After composition, anhydride functionality was converted to diacid functionality by hydrolysis using sodium hydroxide solution. Further, membrane was characterized by ATR-IR, DSC and SEM. Charge confirmation was done by IEC. Water uptake and contact angle analysis was carried out to study the hydrophilicity of the membrane. The performance study was carried out by using NaCl and CaCl2 solutions. Membranes were having higher charge density, which has resulted in better performance in terms of rejection of CaCl2 and NaCl solutions. The main focus of this research is to evaluate the effect of alkali treatment on Donnan and size exclusion mechanism during membrane filtration.

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Preparation, Characterization and Performance Study of Poly(isobutylene-alt-maleic anhydride) [PIAM] and Polysulfone [PSf] Composite Membranes before and after Alkali Treatment

Industrial & Engineering Chemistry Research ◽

10.1021/ie102387n ◽

2011 ◽

Vol 50 (11) ◽

pp. 6528-6534 ◽

Cited By ~ 33

Author(s):

Mahesh Padaki ◽

Arun M. Isloor ◽

Ganesh Belavadi ◽

K. Narayan Prabhu

Keyword(s):

Maleic Anhydride ◽

Alkali Treatment ◽

Composite Membranes ◽

Performance Study ◽

Before And After ◽

And Performance

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Separation of aquatic humic material before and after chlorination using high-performance size exclusion chromatography

Organic Geochemistry ◽

10.1016/0146-6380(85)90059-2 ◽

1985 ◽

Vol 8 (1) ◽

pp. 107 ◽

Cited By ~ 2

Author(s):

Georg Becher ◽

Georg E. Carlberg

Keyword(s):

Size Exclusion Chromatography ◽

High Performance ◽

Size Exclusion ◽

Humic Material ◽

Before And After ◽

Exclusion Chromatography

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Identification of food-derived peptides in human blood after ingestion of corn and wheat gluten hydrolysates

Journal of Food Bioactives ◽

10.31665/jfb.2018.2145 ◽

2018 ◽

Vol 2 ◽

Cited By ~ 7

Author(s):

Akika Ejima ◽

Megumi Nakamura ◽

Yasushi A. Suzuki ◽

Kenji Sato

Keyword(s):

Matrix Protein ◽

Leucine Aminopeptidase ◽

Wheat Gluten ◽

Protein Hydrolysates ◽

The Body ◽

Size Exclusion ◽

Extracellular Matrix Protein ◽

Reverse Phase Hplc ◽

Before And After ◽

Exclusion Chromatography

Bioactive peptides in the body after ingestion of plant protein hydrolysates have been speculated but not identified. We aimed to establish an approach to identify small amounts of food-derived peptides in humans after ingestion of non-extracellular matrix protein hydrolysates. Corn and wheat gluten hydrolysates were digested using pancreatin and leucine aminopeptidase; the resultant peptides were identified via size-exclusion chromatography and reverse-phase HPLC-tandem mass spectrometry (MS/MS). Structures of indigestible peptides were confirmed via LC-MS/MS in multi-reaction monitoring mode. All indigestible peptides in the exopeptidase digest were diprolyl and di- and tripyroglutamyl peptides. Blood collected from healthy volunteers (n = 4) before and after ingestion of 9 g of the hydrolysates was assessed for the indigestible peptides via LC-MS/MS. Six peptides (Pro-Ala, Pro-Gly, Pro-Gln, pyroGlu-Pro, pyroGlu-Leu-Pro, and pyroGlu-Gln-Pro) significantly increased in human plasma up to 10–100 nM compared to the baseline. This may hence be a powerful tool for identifying foodderived peptides in blood.

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Polymeric Membrane for Verteporfirin Purification

Materiale Plastice ◽

10.37358/mp.17.1.4775 ◽

2017 ◽

Vol 54 (1) ◽

pp. 14-17 ◽

Cited By ~ 1

Author(s):

Stefania Simionescu ◽

Sofia Teodorescu ◽

Rodica Mariana Ion ◽

Elena Voicila ◽

Gheorghe Nechifor

Keyword(s):

Active Substance ◽

Polymeric Membrane ◽

Basic Form ◽

Polysulfone Membrane ◽

Analytical Results ◽

Before And After ◽

Ophthalmic Diseases ◽

Tumor Types ◽

Polymer Type

Verteporfirin is the active substance of the medicine Visudyne (the basic form porphyrin of the medicine) approved and in use for ophthalmic diseases and tumor types. Because the informations from literature about degraded of this porphyrins are greatly reduced, we propose in this paper to separate the different degraded forms of this porphyrin by using polysulfone membrane polymer type. In this paper are presented some analytical results of verteporfirin before and after passing degraded form of the porphyrins over these membranes.

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Bubble Performance Study before and after Detachment in a Membrane Bioreactor

10.1615/tfec2020.mph.032387 ◽

2020 ◽

Author(s):

Guiqin Liu ◽

Hui An ◽

Peng Cheng Wang ◽

Joo Guan Hang ◽

Simon C.M. Yu

Keyword(s):

Membrane Bioreactor ◽

Performance Study ◽

Before And After

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Lipid Profiles in Lyme Borreliosis: A Potential Role for Apheresis?

Hormone and Metabolic Research ◽

10.1055/a-0885-7169 ◽

2019 ◽

Vol 51 (05) ◽

pp. 326-329 ◽

Cited By ~ 2

Author(s):

Richard Straube ◽

Karin Voit-Bak ◽

A. Gor ◽

Til Steinmeier ◽

George P. Chrousos ◽

...

Keyword(s):

Lyme Disease ◽

Membrane Filtration ◽

Clinical Symptoms ◽

Causal Relation ◽

Pilot Trial ◽

Lipid Profiles ◽

Common Causes ◽

Before And After ◽

History Of ◽

Lipids And Lipoproteins

AbstractDyslipidemia and dyslipoproteinemia are common causes of metabolic and cardiovascular diseases. On the other hand, intracellular bacteria, such as Borrelia burgdorferi, utilize host lipids to survive and disseminate within the host. Recent data suggest that elevated lipids are a contributing factor to the maintenance and severity of Lyme disease and its complications. Here we review and discuss the role of lipids in Borreliosis and report on a pilot trial to examine the potential roles of circulating lipids and lipoproteins in patients with Borrelia infection. In this analysis we assessed the clinical and lipid profiles of 519 patients (319 women, 200 men) with a proven history of Lyme disease, before and after an extracorporeal double membrane filtration. Lipid profiles pre- and post-apheresis were analyzed in conjunction with clinical symptoms and parameters of inflammation. Circulating cholesterol, triglycerides, LDL, LP(a), and other inflammatory lipids were significantly reduced after the apheresis, while symptoms of the disorder and bioindexes of inflammation such as CRP improved. Further studies should be initiated to investigate the possibly causal relation between Lyme disease and circulating lipids and to design appropriate therapeutic strategies.

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Preparation and Performance Study of Fluorosilicone Oligomer Anti-Sticking Coatings

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.841.209 ◽

2020 ◽

Vol 841 ◽

pp. 209-213

Author(s):

Dong Bo Guan ◽

Xiao Jie Zhai ◽

Ying Nan Biansai ◽

Bo Jun Cao ◽

Yong Fu Zhu ◽

...

Keyword(s):

Molecular Structure ◽

Contact Angle ◽

Infrared Spectroscopy ◽

Contact Time ◽

Curing Agent ◽

Performance Study ◽

Film Forming ◽

Increasing Trend ◽

Before And After ◽

And Performance

In this paper, fluorosilicone oligomer and its curing agent are used as the main film-forming materials, and fluorosilicone POSS is added to reduce the surface energy of the composites to prepare a coating with certain anti-sticking effect. The changes of molecular structure before and after the reaction were obtained by infrared spectroscopy. The contact angle and anti-sticking property of the coating surface were studied by changing the content of POSS containing fluorine. It was found that the contact angle of fluorine-containing POSS reached 98.7° when the content of fluorine-containing POSS was 3 Wt.%. With the increase of POSS content, the anti-sticking force of composites changed little, but with the increase of the contact time of tape, the anti-sticking force showed an increasing trend.

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Membrane Filtration: Expanding the Areas of Application by Chemical Modification – Examples from the FHNW

CHIMIA International Journal for Chemistry ◽

10.2533/chimia.2020.423 ◽

2020 ◽

Vol 74 (5) ◽

pp. 423-425

Author(s):

Kirsten Remmena ◽

Joachim Koeserb

Keyword(s):

Chemical Modification ◽

Polymer Brushes ◽

Membrane Filtration ◽

Size Exclusion ◽

Beverage Industry ◽

University Of Applied Sciences ◽

Food And Beverage ◽

Drinking Water Production ◽

The University ◽

Pharmaceutical Production

Membrane filtration applications are omnipresent in production processes of the food and beverage industry, in pharmaceutical production and the petrochemical industry but also in water purification for drinking water production and wastewater treatment. The main separation principle in membrane filtration is based on size exclusion which is dependent on the pore size of the membrane. Current developments based on chemical modification of these membranes have the goal to confer an additional chemical selectivity to membranes in order to broaden their areas of application. Here we present two examples of chemical membrane modifications pursued at the University of Applied Sciences and Arts Northwestern Switzerland (FHNW) which are based on a) polyelectrolyte multilayer (PEM or LbL) coatings and b) coating with stimulus responsive polymer brushes. Applications of such modified filtration membranes are e.g. selectively gated filtration and phosphorous P-recovery from acidic disintegrated sewage sludge.

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