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Gladys Rosario Ramos Yacasi, María Luisa García López, Marta Espina García, Alexander Parra Coca, Ana Cristina Calpena Campmany
This study investigated the suspension of poly(ε-caprolactone) nanoparticles as an ocular delivery system for flurbiprofen (FB-PεCL-NPs) in order to overcome the associated problems, such as stability, sterility, tolerance, and efficacy, with two different FB-PεCL-NP formulations. The formulations were stabilized with poloxamer 188 (1.66% and 3.5%) and submitted individually for freeze-drying and γ-irradiation with polyethylene glycol 3350 (PEG3350) and d-(+)-trehalose (TRE). Both formulations satisfied criteria according to all physicochemical parameters required for ocular pharmaceuticals...
2016: International Journal of Nanomedicine
Autumn L Edenfield, Nazema Y Siddiqui, Jennifer M Wu, Alexis A Dieter, Melissa A Garrett, Anthony G Visco
OBJECTIVE: To compare time to first bowel movement and additional gastrointestinal outcomes between women receiving polyethylene glycol 3350 (PEG3350) and docusate sodium and docusate sodium alone after urogynecologic surgery. METHODS: Participants received twice-daily 100 mg docusate sodium and were randomized to daily 1) PEG3350 or 2) inert placebo for 5 days after urogynecologic surgery. They completed bowel diaries, Bristol stool scale, validated Patient Assessment of Constipation Symptom Questionnaire, and Patient Assessment of Constipation Quality-of-Life Questionnaire preoperatively and 1 week after surgery...
September 2016: Obstetrics and Gynecology
P B Miner, M Camilleri, D Burton, H Achenbach, H Wan, J Dragone, B Mellgard
BACKGROUND: This study compared prucalopride, a selective, prokinetic, 5-HT4 receptor agonist, with polyethylene glycol 3350 + electrolytes (PEG3350), an osmotic laxative, on colonic motility parameters, primarily high-amplitude propagating contractions (HAPCs) in patients with chronic constipation. METHODS: This randomized, cross-over, reader-blinded study was conducted at a single site in the USA. The study was open to men and women aged 18-75 years who met study inclusion criteria...
September 2016: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
Hsin-Yun Hsu, Scott Toth, Garth J Simpson, Michael T Harris
Solid dispersions have been used to enhance the bioavailability of poorly water-soluble active pharmaceutical ingredients (APIs). However, the solid state phase, compositional uniformity, and scale-up problems are issues that need to be addressed. To allow for highly controllable products, the Drop Printing (DP) technique can provide precise dosages and predictable compositional uniformity of APIs in two/three dimensional structures. In this study, DP was used to prepare naproxen (NAP)/polyethylene glycol 3350 (PEG3350) solid dispersions with PEG coatings of different molecular weights (MW)...
December 2015: AIChE Journal
Thomas Manning, Sydney Plummer, Tess Baker, Greg Wylie, Amy C Clingenpeel, Dennis Phillips
The bacterium responsible for causing tuberculosis has evolved resistance to antibiotics used to treat the disease, resulting in new multidrug resistant Mycobacterium tuberculosis (MDR-TB) and extensively drug resistant M. tuberculosis (XDR-TB) strains. Analytical techniques (1)H and (13)C Nuclear Magnetic Resonance (NMR), Fourier Transform-Ion Cyclotron Resonance with Electrospray Ionization (FT-ICR/ESI), and Matrix Assisted Laser Desorption Ionization-Mass Spectrometry (MALDI-TOF-MS) were used to study different aspects of the Cu(II)-polyethylene glycol (PEG-3350)-sucrose-isoniazid and Cu(II)-polyethylene glycol (PEG3350)-glucose-isoniazid complexes...
October 15, 2015: Bioorganic & Medicinal Chemistry Letters
Rocío L Pérez, Dana B Loureiro, Bibiana B Nerli, Gisela Tubio
Enzyme extraction using aqueous two-phase systems (ATPS) has been increasingly used as a primary recovery technique which integrates the clarification, concentration and partial purification of important biomolecules from their natural source in a single step. The goal of this work was to optimize the extraction of trypsin from pancreas homogenate with polyethylene glycol and sodium citrate (PEG/NaCit) ATPS by using the tools of experimental design. The variables NaCl concentration - added inert salt -, the top/bottom phase volume ratio - Vr - and the biomass loaded into the system - in percentage - were selected as the main factors in the trypsin extraction...
February 2015: Protein Expression and Purification
Jessica T Lie, Claire Monnereau, Esther A Groeneveld-van Beek, Jacqueline van der Wees, Johannes Frank, Marieke Bruinsma, Gerrit R J Melles
Anterior donor grafts (including scleral rim, without Descemet membrane) increase in thickness and become hazy upon storage in organ culture (OC) medium. Transfer of these grafts to standard dehydration media just before transplantation does not reduce their thickness to normal. Therefore, we assessed the efficacy of different media enriched with polyethylene glycol (PEG) as dehydrating agents for organ-cultured anterior donor grafts. Grafts were harvested and stored in the commercial OC medium 'Max' (without dextran) for 1 week, and subsequently dehydrated in the standard commercial dehydration medium 'Jet' (with dextran) supplemented with 4-20% PEG3350, or 'Max' supplemented with 20% PEG6000 and PEG20...
September 2015: Cell and Tissue Banking
Christos P Papaneophytou, Anthi K Mettou, Vagelis Rinotas, Eleni Douni, George A Kontopidis
Many active compounds may be excluded from biological assays due to their low aqueous solubility. In this study, a simple method for the determination of the solubility of compounds containing aromatic rings is proposed. In addition to DMSO, five organic solvents for screening experiments of TNF-α inhibitors were explored. DMSO and PEG3350 were the most suitable for both protein stability and ligand-binding experiments. In addition, glycerol is a promising solvent for the screening of other compounds for which it might provide acceptable solubilization, due to its strong tendency to preserve the protein...
January 10, 2013: ACS Medicinal Chemistry Letters
Jiyan Yu, Weizhong Chen, Chi Wu, Hao Chen
In a recent attempt to crystallize a regulator of MexAB-OprM multi-drug efflux systems in Pseudomonas aeruginosa (NalD), we found that adding polyethylene glycol (PEG3350, Mw = 3,350 g/mol) into the protein solution increases the speed of NalD migration in gel electrophoresis, signaling a smaller hydrodynamic size. At first we conjectured that NalD was degraded unexpectedly by PEG; however, we found that there was no change in its molar mass by MALDI-TOF characterization. Moreover, we found that adding polyacrylic acid (PAA) into the solution mixture returned the NalD migration to its normal speed...
2014: PloS One
Jing Zhao, Si-Shen Feng
Drug formulation by ligand conjugated nanoparticles of biodegradable polymers has become one of the most important strategies in drug targeting. We have developed in our previous work nanoparticles of a mixture of two vitamin E TPGS based copolymers PLA-TPGS and TPGS-TOOH with the latter for Herceptin conjugation for targeted delivery of anticancer drugs such as docetaxel to the cancer cells of human epidermal growth factor receptor 2 (HER2) overexpression. In this research, we investigated the effects of the PEG chain length in TPGS, which is in fact a PEGylated vitamin E, on the cellular uptake and cytotoxicity of the drug formulated in the Herceptin-conjugated nanoparticles of PLA-TPGS/TPGS-COOH blend (NPs)...
March 2014: Biomaterials
A Shin, M Camilleri, G Kolar, P Erwin, C P West, M H Murad
BACKGROUND: Highly selective 5-HT4 agonists have been suggested for the treatment of chronic constipation (CC). AIM: To assess the effects of highly selective 5-HT4 agonists (prucalopride, velusetrag or naronapride) on patient-important clinical efficacy outcomes and safety in adults with CC. METHODS: We searched the medical literature in January 2013 using MEDLINE/Pubmed, Embase, Cochrane Library, and Web of Science/Scopus for randomised, controlled trials of highly selective 5-HT4 agonists in adults with CC, with no minimum duration of therapy (maximum 12 weeks) or date limitations...
February 2014: Alimentary Pharmacology & Therapeutics
Mayur Brahmania, George Ou, Brian Bressler, Hin Kin Ko, Eric Lam, Jennifer Telford, Robert Enns
BACKGROUND: Low-volume bowel preparations are ideal to ensure patient compliance, thus enabling high-quality examinations to be achieved. OBJECTIVES: To examine the bowel-cleansing efficacy and patient tolerability of split-dose 2 L PEG3350 + electrolytes (PEG3350e) with 15 mg bisacodyl versus split-dose 4 L PEG3350e. DESIGN: Single-blinded, noninferiority, randomized, controlled trial. SETTING: Single site, university-affiliated tertiary care center...
March 2014: Gastrointestinal Endoscopy
Christina S Haak, Brijesh Bhayana, William A Farinelli, R Rox Anderson, Merete Haedersdal
Ablative fractional lasers (AFXL) facilitate uptake of topically applied drugs by creating narrow open micro-channels into the skin, but there is limited information on optimal laser settings for delivery of specific molecules. The objective of this study was to investigate the impact of laser treatment density (% of skin occupied by channels) and molecular weight (MW) for fractional CO(2) laser-assisted drug delivery. AFXL substantially increased intra- and transcutaneous delivery of polyethylene glycols (PEGs) in a MW range from 240 to 4300 Da (Nuclear Magnetic Resonance, p<0...
November 10, 2012: Journal of Controlled Release: Official Journal of the Controlled Release Society
Chinna Reddy Palem, Sunil Kumar Battu, Sindhuri Maddineni, Ramesh Gannu, Michael A Repka, Madhusudan Rao Yamsani
The objective of the study was to prepare and characterize the domperidone (DOM) hot-melt extruded (HME) buccal films by both in vitro and in vivo techniques. The HME film formulations contained PEO N10 and/or its combination with HPMC E5 LV or Eudragit RL100 as polymeric carriers, and PEG3350 as a plasticizer. The blends were co-processed at a screw speed of 50 rpm with the barrel temperatures ranging from 120-160°C utilizing a bench top co-rotating twin-screw hot-melt extruder using a transverse-slit die...
February 2013: Pharmaceutical Development and Technology
Monica L Adams, Venkatramana M Rao, Ajit Thakur, Munir A Hussain
PEGylated poly(carboxylic acid)s, PEG-b-PCAs, were evaluated as additives for solubilized oral formulations of weakly acidic compounds. Micelles of poly(ethylene glycol)-block-poly(acrylic acid), PEG-b-PAA, and poly(ethylene glycol)-block-poly(methacrylic acid), PEG-b-PMAA, were prepared. Fluorescence spectroscopy and dynamic light scattering revealed that both polymers assemble into nanoscopic structures (< 200 nm) in acidic media and exhibit pH-sensitive colloidal phase behavior. Using a solvent evaporation technique, the block copolymers and corresponding PCA homopolymers were incorporated into PEG3350-based solid dispersions...
June 2010: Pharmaceutical Development and Technology
Marcela A Moretton, Diego A Chiappetta, Alejandro Sosnik
Rifampicin-loaded poly(ε-caprolactone)-b-poly(ethylene glycol)-poly(ε-caprolactone) flower-like polymeric micelles display low aqueous physical stability over time and undergo substantial secondary aggregation. To improve their physical stability, the lyoprotection-lyophilization process was thoroughly characterized. The preliminary cryoprotectant performance of mono- and disaccharides (e.g. maltose, glucose), hydroxypropyl-β-cyclodextrin (HPβCD) and poly(ethylene glycol) (PEG) of different molecular weights was assessed in freeze-thawing assays at -20°C, -80°C and -196°C...
March 7, 2012: Journal of the Royal Society, Interface
R Jibaly, J LaChance, N A Lecea, N Ali, J E Weber
OBJECTIVES: Successful colonoscopy preparation requires a method which is easy to administer. Simplifying this technique would be useful for adult and pediatric gastroenterologists. Most cleanout agents are not well tolerated by children. Polyethylene glycol without electrolytes (PEG3350 without electrolytes) has been used for constipation and bowel cleanout, but has not been studied as 2-day preparation for colonoscopy in children. This study evaluates the dosing, effectiveness and satisfaction with PEG3350 without electrolytes as a 2-day cleanout for colonoscopy preparation in children...
October 2011: European Journal of Pediatric Surgery
Fiona M Tam, Anthony P Carr, Sherry L Myers
Recurrent constipation is a common problem in cats. Laxatives often are the cornerstone for management of recurrent constipation; however, there is a paucity of published research on laxative use in cats. This study investigated the safety and palatability of polyethylene glycol (PEG3350) in normal cats. All cats consumed the PEG3350 laxative for 4 weeks without changes in weight or food intake. In all cats soft stools were achieved. Effective doses varied widely in experimental cats, so individualized dosing is important...
October 2011: Journal of Feline Medicine and Surgery
Xiaohui Zhou, Michael E Konkel, Douglas R Call
The Vibrio parahaemolyticus type III secretion system 1 (T3SS1) induces cytotoxicity in mammalian epithelial cells. We characterized the cell death phenotype in both epithelial (HeLa) and monocytic (U937) cell lines following infection with V. parahaemolyticus. Using a combination of the wild-type strain and gene knockouts, we confirmed that V. parahaemolyticus strain NY-4 was able to induce cell death in both cell lines via a T3SS1-dependent mechanism. Bacterial contact, but not internalization, was required for T3SS1-induced cytotoxicity...
March 2009: Microbiology
Samuel Nurko, Nader N Youssef, Mahmoud Sabri, Annette Langseder, John McGowan, Mark Cleveland, Carlo Di Lorenzo
OBJECTIVE: To establish the efficacy and best starting dose of polyethylene glycol (PEG)3350 in the short-term treatment of children with functional constipation. STUDY DESIGN: Prospective, randomized, multicenter, double-blinded, placebo-controlled, dose-ranging study of PEG3350 in children with functional constipation. Patients were randomly assigned to either placebo or 0.2 g/kg per day, 0.4 g/kg per day, or 0.8 g/kg per day of PEG3350 after a 1 week run-in period, followed by 2 weeks of treatment...
August 2008: Journal of Pediatrics
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