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Ultrafiltration

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https://www.readbyqxmd.com/read/28214720/treatment-efficiency-and-economic-feasibility-of-biological-oxidation-membrane-filtration-and-separation-processes-and-advanced-oxidation-for-the-purification-and-valorization-of-olive-mill-wastewater
#1
L Ioannou-Ttofa, I Michael-Kordatou, S C Fattas, A Eusebio, B Ribeiro, M Rusan, A R B Amer, S Zuraiqi, M Waismand, C Linder, Z Wiesman, J Gilron, D Fatta-Kassinos
Olive mill wastewater (OMW) is a major waste stream resulting from numerous operations that occur during the production stages of olive oil. The resulting effluent contains various organic and inorganic contaminants and its environmental impact can be notable. The present work aims at investigating the efficiency of (i) jet-loop reactor with ultrafiltration (UF) membrane system (Jacto.MBR), (ii) solar photo-Fenton oxidation after coagulation/flocculation pre-treatment and (iii) integrated membrane filtration processes (i...
February 12, 2017: Water Research
https://www.readbyqxmd.com/read/28212269/separation-and-characterization-of-angiotensin-i-converting-enzyme-ace-inhibitory-peptides-from-saurida-elongata-proteins-hydrolysate-by-imac-ni-2
#2
Lixia Sun, Shanguang Wu, Liqin Zhou, Feng Wang, Xiongdiao Lan, Jianhua Sun, Zhangfa Tong, Dankui Liao
Lizard fish protein hydrolysates (LFPH) were prepared from Lizard fish (Saurida elongata) proteins possessing powerful angiotensin I converting enzyme (ACE) inhibitory activity and the fraction (LFPH-I) with high ACE inhibitory activity was obtained through ultrafiltration. The active Fraction (F2) was isolated from LFPH-I using immobilized metal affinity chromatography (IMAC-Ni(2+)). Analysis of amino acid levels revealed that F2 eluted from IMAC was enriched in Met, His, Tyr, Pro, Ile, and Leu compared to the crude peptide LFPH-I...
February 15, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28209075/investigation-of-optimum-n-terminal-probrain-natriuretic-peptide-level-in-patients-on-maintained-hemodialysis
#3
Lan Chen, Ying-Ying Chen, Yi-Sheng Ling, Chun-Hua Lin, Jin-Xuan He, Tian-Jun Guan
BACKGROUND: Serum N-terminal probrain natriuretic peptide (NT-proBNP) level is known to be strongly associated with fluid overload, and serves as a guide for fluid management in patients on hemodialysis (HD). This study aimed at investigating the relationship between NT-proBNP level and blood pressure (BP), ultrafiltration/dry weight ratio as well as hemoglobin, and to explore the optimal cutoff point of NT-proBNP level in Chinese patients on HD. METHODS: A total of 2306 patients on maintained HD for stage 5 chronic kidney disease (CKD) were included in this prospective study...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28199082/influence-of-solvent-on-the-structure-of-an-amphiphilic-block-copolymer-in-solution-and-in-formation-of-an-integral-asymmetric-membrane
#4
Maryam Radjabian, Clarissa Abetz, Birgit Fischer, Andreas Meyer, Volker Abetz
Nanoporous membranes with tailored size pores and multifunctionality derived from self-assembled block copolymers attract growing interest in ultrafiltration. The influence of the structure of block copolymer in the membrane casting solution on the formation of integral asymmetric isoporous block copolymer membranes using the nonsolvent induced phase separation process (NIPS) has been one of the long-standing questions in this research area. In this work we studied the principal role of the solvent on the micellization and self-assembly of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymers by using a combination of dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS)...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28193826/the-nlrp3-inflammasome-has-a-critical-role-in-peritoneal-dialysis-related-peritonitis
#5
Nicolas Hautem, Johann Morelle, Amadou Sow, Cyril Corbet, Olivier Feron, Eric Goffin, François Huaux, Olivier Devuyst
Bacterial peritonitis remains the main cause of technique failure in peritoneal dialysis (PD). During peritonitis, the peritoneal membrane undergoes structural and functional alterations that are mediated by IL-1β The NLRP3 inflammasome is a caspase-1-activating multiprotein complex that links sensing of microbial and stress products to activation of proinflammatory cytokines, including IL-1β The potential roles of the NLRP3 inflammasome and IL-1β in the peritoneal membrane during acute peritonitis have not been investigated...
February 13, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28192760/competitive-binding-experiments-can-reduce-the-false-positive-results-of-affinity-based-ultrafiltration-hplc-a-case-study-for-identification-of-potent-xanthine-oxidase-inhibitors-from-perilla-frutescens-extract
#6
Zhiqiang Wang, Shin Hwa Kwon, Seung Hwan Hwang, Young-Hee Kang, Jae-Yong Lee, Soon Sung Lim
The purpose of this study was to assess the possibility of using competitive binding experiments with ultrafiltration-HPLC analysis to identify potent xanthine oxidase (XO) inhibitors from the Perilla frutescens extract as an attempt to reduce the number of false positive results. To isolate the enzyme-ligand complex from unbound compounds, the P. frutescens extract was either incubated in the absence of XO, in the presence of XO, or with the active site blocked XO before the ultrafiltration was performed. Allopurinaol was used as the XO active site blocker...
February 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28187686/nanofiltration-membrane-with-a-mussel-inspired-interlayer-for-improved-permeation-performance
#7
Xi Yang, Yong Du, Xi Zhang, Ai He, Zhi-Kang Xu
A mussel-inspired interlayer of polydopamine (PDA)/polyethylenimine (PEI) is codeposited on the ultrafiltration substrate to tune the interfacial polymerization of piperazine and trimesoyl chloride for the preparation of thin-film composite (TFC) nanofiltration membranes (NFMs). This hydrophilic interlayer results in an efficient adsorption of piperazine solution in the substrate pores. The solution height increases with the PDA/PEI codeposition time from 45 to 135 min due to the capillary effect of the substrate pores...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28187348/ferrous-iron-peroxymonosulfate-oxidation-as-a-pretreatment-for-ceramic-ultrafiltration-membrane-control-of-natural-organic-matter-fouling-and-degradation-of-atrazine
#8
Xiaoxiang Cheng, Heng Liang, An Ding, Xiaobin Tang, Bin Liu, Xuewu Zhu, Zhendong Gan, Daoji Wu, Guibai Li
Ferrous iron/peroxymonosulfate (Fe(II)/PMS) oxidation was employed as a pretreatment method for ultrafiltration process to control membrane fouling caused by natural organic matter, including humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA), and their mixture (HA-SA-BSA). To evaluate the mechanism of fouling mitigation, the effects of Fe(II)/PMS pretreatment on the characteristics of feed water were examined. The degradation of atrazine (ATZ) was also investigated and the species of generated radicals were preliminarily determined...
February 1, 2017: Water Research
https://www.readbyqxmd.com/read/28186570/a-reliable-method-to-assess-the-water-permeability-of-a-dialysis-system-the-global-ultrafiltration-coefficient
#9
A Ficheux, N Gayrard, F Duranton, C Guzman, I Szwarc, F Vetromile, P Brunet, M F Servel, A Argilés
No abstract text is available yet for this article.
February 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28182626/ultrasensitive-detection-of-serum-hepatitis-b-virus-by-coupling-ultrafiltration-dna-extraction-with-real-time-pcr
#10
Bin Wu, Feng Xiao, Peiwen Li, Yan Du, Jinqiong Lin, Kaihua Ming, Bin Chen, Xiuxia Lei, Banglao Xu, Dayu Liu
BACKGROUND: A simple and reliable DNA extraction of hepatitis B virus (HBV) is critical in developing an ultrasensitive detection method for HBV infection. Current commercially available serum Hepatitis B Virus (HBV) DNA extraction methods are time-consuming, expensive and/or require specialized equipment, which hinders wide adoption of clinical laboratories. This study offers a report on an ultrasensitive HBV DNA detection method by coupling serum HBV DNA extraction by ultrafiltration (UF) with real-time PCR (qPCR) detection...
2017: PloS One
https://www.readbyqxmd.com/read/28169026/fluorescence-spectroscopy-and-parallel-factor-analysis-as-a-dissolved-organic-monitoring-tool-to-assess-treatment-performance-in-drinking-water-trains
#11
M Vera, S Cruz, M R Boleda, J Mesa, J Martín-Alonso, S Casas, O Gibert, J L Cortina
Fluorescence excitation emission matrix (FEEM) spectroscopy was used to evaluate its applicability as a tool to track dissolved organic matter (DOM) in a drinking water treatment plant (DWTP) that incorporates a conventional line (consisting in ozonation and GAC filtration) and a membrane-based line (consisting in ultrafiltration, reverse osmosis and mineralization) working in parallel. Seven sampling points within the different process stages were characterized monthly during 2014. A global Parallel Factor Analysis (PARAFAC) was used to pull out underlying organic fractions from the fluorescence spectra...
February 3, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28164430/assessment-of-intradialysis-calcium-mass-balance-by-single-pool-variable-volume-calcium-kinetic-model
#12
Salvatore di Filippo, Fabio Carfagna, Vincenzo la Milia, Antonio Bellasi, Giustina Casagrande, Camilla Bianchi, Domenico Vito, Maria Laura Costantino, Giuseppe Rombolà, Claudio Minoretti, Carlo Schönholzer, Giuseppe Pontoriero, Francesco Locatelli
INTRODUCTION: A reliable method of intradialysis calcium mass balance quantification is far from been established. We herein investigated the use of a single-pool variable-volume Calcium kinetic model to assess calcium mass balance in chronic and stable dialysis patients. METHODS: Thirty-four patients on thrice-weekly HD were studied during 240 dialysis sessions. All patients were dialyzed with a nominal total calcium concentration of 1.50 mmol/L. The main assumption of the model is that the calcium distribution volume is equal to the extracellular volume during dialysis...
February 5, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28155882/development-of-a-nanocomposite-ultrafiltration-membrane-based-on-polyphenylsulfone-blended-with-graphene-oxide
#13
Arun Kumar Shukla, Javed Alam, Mansour Alhoshan, Lawrence Arockiasamy Dass, M R Muthumareeswaran
In the present study, graphene oxide (GO) was incorporated as a nanoadditive into a polyphenylsulfone (PPSU) to develop a PPSU/GO nanocomposite membrane with enhanced antifouling properties. A series of membranes containing different concentrations (0.2, 0.5 and 1.0 wt.%) of GO were fabricated via the phase inversion method, using N-methyl pyrrolidone (NMP) as the solvent, deionized water as the non-solvent, and polyvinylpyrrolidone (PVP) as a pore forming agent. The prepared nanocomposite membranes were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM), and were also characterized with respect to contact angle, zeta potential and porosity, mean pore radius, tortuosity and molecular weight cut-off (MWCO)...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28153197/peritoneal-membrane-preservation
#14
REVIEW
M Auxiliadora Bajo, Gloria Del Peso, Isaac Teitelbaum
Peritoneal dialysis (PD) is a successfully used method for renal replacement therapy. However, long-term PD may be associated with peritoneal fibrosis and ultrafiltration failure. The key factors linked to their appearance are repeated episodes of inflammation associated with peritonitis and long-term exposure to bioincompatible PD fluids. Different strategies have been proposed to preserve the peritoneal membrane. This article reviews the functional and structural alterations related to PD and strategies whereby we may prevent them to preserve the peritoneal membrane...
January 2017: Seminars in Nephrology
https://www.readbyqxmd.com/read/28153193/low-gdp-solution-and-glucose-sparing-strategies-for-peritoneal-dialysis
#15
REVIEW
Cheuk Chun Szeto, David W Johnson
Long-term exposure to a high glucose concentration in conventional peritoneal dialysis (PD) solution has a number of direct and indirect (via glucose degradation products [GDP]) detrimental effects on the peritoneal membrane, as well as systemic metabolism. Glucose- or GDP-sparing strategies often are hypothesized to confer clinical benefits to PD patients. Icodextrin (glucose polymer) solution improves peritoneal ultrafiltration and reduces the risk of fluid overload, but these beneficial effects are probably the result of better fluid removal rather than being glucose sparing...
January 2017: Seminars in Nephrology
https://www.readbyqxmd.com/read/28151871/antihypertensive-medications-and-risk-of-death-and-hospitalizations-in-us-hemodialysis-patients-evidence-from-a-cohort-study-to-inform-hypertension-treatment-practices
#16
Tariq Shafi, Stephen M Sozio, Jason Luly, Karen J Bandeen-Roche, Wendy L St Peter, Patti L Ephraim, Aidan McDermott, Charles A Herzog, Deidra C Crews, Julia J Scialla, Navdeep Tangri, Dana C Miskulin, Wieneke M Michels, Bernard G Jaar, Philip G Zager, Klemens B Meyer, Albert W Wu, L Ebony Boulware
Antihypertensive medications are commonly prescribed to hemodialysis patients but the optimal regimens to prevent morbidity and mortality are unknown. The goal of our study was to compare the association of routinely prescribed antihypertensive regimens with outcomes in US hemodialysis patients.We used 2 datasets for our analysis. Our primary cohort (US Renal Data System [USRDS]) included adult patients initiating in-center hemodialysis from July 1, 2006 to June 30, 2008 (n = 33,005) with follow-up through December 31, 2009...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28148536/impact-of-rapid-ultrafiltration-rate-on-changes-in-the-echocardiographic-left-atrial-volume-index-in-patients-undergoing-haemodialysis-a-longitudinal-observational-study
#17
Jwa-Kyung Kim, Young Rim Song, GunHa Park, Hyung Jik Kim, Sung Gyun Kim
OBJECTIVE: Optimal fluid management is essential when caring for a patient on haemodialysis (HD). However, if the fluid removal is too rapid, the resultant higher ultrafiltration rate (UFR) disadvantageously promotes haemodynamic instability and cardiac injury. We evaluated the effects of a rapid UFR on changes in the echocardiographic left atrial volume index (LAVI) over a period of time. DESIGN: Longitudinal observational study. SETTING AND PARTICIPANTS: A total of 124 new patients on HD...
February 1, 2017: BMJ Open
https://www.readbyqxmd.com/read/28143897/glomerular-hyperfiltration-in-diabetes-mechanisms-clinical-significance-and-treatment
#18
Lennart Tonneijck, Marcel H A Muskiet, Mark M Smits, Erik J van Bommel, Hiddo J L Heerspink, Daniël H van Raalte, Jaap A Joles
An absolute, supraphysiologic elevation in GFR is observed early in the natural history in 10%-67% and 6%-73% of patients with type 1 and type 2 diabetes, respectively. Moreover, at the single-nephron level, diabetes-related renal hemodynamic alterations-as an adaptation to reduction in functional nephron mass and/or in response to prevailing metabolic and (neuro)hormonal stimuli-increase glomerular hydraulic pressure and transcapillary convective flux of ultrafiltrate and macromolecules. This phenomenon, known as glomerular hyperfiltration, classically has been hypothesized to predispose to irreversible nephron damage, thereby contributing to initiation and progression of kidney disease in diabetes...
January 31, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28142501/dynamic-filtration-with-a-perforated-disk-for-dewatering-of-tetraselmis-suecica
#19
Joo-Young Jung, Kyochan Kim, Sun-A Choi, Heewon Shin, Donghyun Kim, Sungchul C Bai, Yong Keun Chang, Jong-In Han
Dynamic filtration equipped with a perforated disk was adopted for the first time to dewater and concentrate Tetraselmis suecica, from a typical solution of 2 to 100 g/L of dense biomass suited for the downstream process. An ultrafiltration membrane, polyethersulfone 150 kDa, was found to best perform in terms of high biomass retention and filtration rate. At 1600 rpm, the highest rotation speed of the disk we tested, plateau permeate flux increased up to 20.2 times higher than those with no rotation; this improvement was attributed to fouling reduction (up to 98%) via distinctively high shear stress on the membrane surface...
February 1, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28142234/plasma-protein-binding-structure-activity-relationships-related-to-the-n-terminus-of-daptomycin
#20
Elena K Schneider, Johnny X Huang, Vincenzo Carbone, Meiling Han, Yan Zhu, Sue Nang, Keith K Khoo, Johnson Mak, Matthew A Cooper, Jian Li, Tony Velkov
Daptomycin is a lipopeptide antibiotic that is highly bound to plasma proteins. To date, the plasma components and structure-activity relationships responsible for the plasma protein binding profile of daptomycin remain uncharacterized. In the present study we have employed a surface plasmon resonance assay together with molecular docking techniques to investigate the plasma protein binding structure-activity relationships related to the N-terminal fatty acyl of daptomycin. Three compounds were investigated: (1) native daptomycin, which displays an N-terminal n-decanoyl fatty acid side chain, and two analogues with modifications to the N-terminal fatty acyl chain; (2) des-acyl daptomycin; and (3) acetyl-daptomycin...
February 10, 2017: ACS Infectious Diseases
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