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https://www.readbyqxmd.com/read/28732169/design-of-modular-peptide-surfactants-and-their-surface-activity
#1
Hao-Fei Wang, David Wibowo, Zhengzhong Shao, Anton Peter J Middelberg, Chun-Xia Zhao
Designed peptide surfactants offer a number of advanced properties over conventional petrochemical surfactants, including biocompatibility, sustainability, and tailorability of the chemical and physical properties through peptide design. Their biocompatibility and degradability make them attractive for various applications, particularly for food and pharmaceutical applications. In this work, two new peptide surfactants derived from an amphiphilic peptide surfactant (AM1) were designed (AM-S and C8-AM) to better understand links between structure, interfacial activity and emulsification...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28724420/legal-access-to-medications-a-threat-to-brazil-s-public-health-system
#2
Ana Luiza Chieffi, Rita De Cassia Barata Barradas, Moisés Golbaum
BACKGROUND: In Brazil, health is fundamental human right guaranteed by the Constitution of 1988, which created the Brazilian Universal Health System (Sistema Único de Saúde - SUS). The SUS provides medications for outpatient care via policy of pharmaceutical assistance (PA) programmes. Despite the advances in PA policies which include the improvement in access to medications, there has been a significant increase in lawsuits related to health products and services. This study aimed to characterize the medication processes filed between 2010 and 2014 against the Secretary of State for Health of São Paulo (State Health Department of São Paulo - SES/SP), in Brazil, following PA policies...
July 19, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28720539/in-depth-experimental-analysis-of-pharmaceutical-twin-screw-wet-granulation-in-view-of-detailed-process-understanding
#3
Maxim Verstraeten, Daan Van Hauwermeiren, Kai Lee, Neil Turnbull, David Wilsdon, Mary Am Ende, Pankaj Doshi, Chris Vervaet, Davinia Brouckaert, Séverine T F C Mortier, Ingmar Nopens, Thomas De Beer
Twin-screw wet granulation is gaining increasing interest within the pharmaceutical industry for the continuous manufacturing of solid oral dosage forms. However, limited prior fundamental physical understanding has been generated relating to the granule formation mechanisms and kinetics along the internal compartmental length of a twin-screw granulator barrel, and about how process settings, barrel screw configuration and formulation properties such as particle size, density and surface properties influence these mechanisms...
July 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28715605/how-to-select-a-nanosimilar
#4
Alain Astier, Amy Barton Pai, Marco Bissig, Daan J A Crommelin, Beat Flühmann, Jean-Daniel Hecq, Josefien Knoeff, Hans-Peter Lipp, Alberto Morell-Baladrón, Stefan Mühlebach
Nanomedicines in the class of nonbiological complex drugs (NBCDs) are becoming increasingly available. Up to 23 nanomedicines have been approved, and approximately 50 are in clinical development. Meanwhile, the first nanosimilars have entered the market through the generic approval pathway, but clinical differences have been observed. Many healthcare professionals may be unaware of this issue and must be informed of these clinically relevant variances. This article provides a tool for rational decision making for the inclusion of nanomedicines into the hospital formulary, including defined criteria for evaluation of substitutability or interchangeability...
July 17, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28713147/to-enroll-or-not-to-enroll-a-researcher-struggles-with-the-decision-to-involve-study-participants-in-a-clinical-trial-that-could-save-their-lives
#5
Roberto Abadie
Hundreds of thousands of clinical trials are conducted annually around the world, working to further scientific knowledge and expand medical treatment. At the same time, clinical trials also present novel challenges to researchers who have access to large pools of research participants and are routinely approached by pharmaceutical companies seeking to recruit subjects for clinical trials. This case study discusses the ethical dilemmas faced by a community health investigator who received an invitation to enroll people who inject drugs (PWID) into a clinical trial of a drug that promised a new treatment option for Hepatitis C...
2017: Narrative Inquiry in Bioethics
https://www.readbyqxmd.com/read/28712055/potential-of-casein-as-a-carrier-for-biologically-active-agents
#6
REVIEW
Tomasz Konrad Głąb, Janusz Boratyński
Casein is the collective name for a family of milk proteins. In bovine milk, casein comprises four peptides: αS1, αS2, β, and κ, differing in their amino acid, phosphorus and carbohydrate content but similar in their amphiphilic character. Hydrophilic and hydrophobic regions of casein show block distribution in the protein chain. Casein peptides carry negative charge on their surface as a result of phosphorylation and tend to bind nanoclusters of amorphous calcium phosphate. Due to these properties, in suitable conditions, casein molecules agglomerate into spherical micelles...
August 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28710982/occurrence-fate-and-mass-balance-of-different-classes-of-pharmaceuticals-and-personal-care-products-in-an-anaerobic-anoxic-oxic-wastewater-treatment-plant-in-xiamen-china
#7
Muhammad Ashfaq, Yan Li, Yuwen Wang, Wenjie Chen, Han Wang, Xiangqiang Chen, Wei Wu, Zhenyi Huang, Chang-Ping Yu, Qian Sun
In this study, the occurrence and fate of 49 pharmaceuticals and personal care products (PPCPs) were investigated in an anaerobic-anoxic-oxic (A2/O) wastewater treatment plant (WWTP) for seven consecutive days using 24-h composite sampling technique. Special emphasis was placed to understand the distribution of PPCPs in dissolved and adsorbed phase, and to evaluate PPCP fate in different treatment units. Among the 49 PPCPs, 40 PPCPs in influent, 36 in effluent, 29 in sludge and 23 in suspended solids were detected at least once during sampling...
July 7, 2017: Water Research
https://www.readbyqxmd.com/read/28706607/evaluation-of-factors-affecting-size-and-size-distribution-of-chitosan-electrosprayed-nanoparticles
#8
Morteza Abyadeh, Ali Akbar Karimi Zarchi, Mohammad Ali Faramarzi, Amir Amani
BACKGROUND: Size and size distribution of polymeric nanoparticles have important effect on their properties for pharmaceutical application. In this study, Chitosan nanoparticles were prepared by electrospray method (electrohydrodynamic atomization) and parameters that simultaneously affect size and/or size distribution of chitosan nanoparticles were optimized. METHODS: Effect of formulation/processing three independent formulation/processing parameters, namely concentration, flow rate and applied voltage was investigated on particle size and size distribution of generated nanoparticles using a Box-Behnken experimental design...
July 2017: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/28705620/application-of-continuous-twin-screw-granulation-for-the-metformin-hydrochloride-extended-release-formulation
#9
Su-Hyeon Kim, Kyu-Min Hwang, Cheol-Hee Cho, Thi-Tram Nguyen, Su Hyun Seok, Kyu-Mok Hwang, Ju-Young Kim, Chun-Woong Park, Yun-Seok Rhee, Eun-Seok Park
This study focuses on evaluating the potential of transferring from a batch process to continuous process for manufacturing of the extended release formulation. Metformin hydrochloride (HCl) was used in the model formulation which was intended to contain the high amount of hydrophilic drug. The effects of barrel temperature, binder type, powder feed rate, and screw speed on granule properties (size and strength) and torque value in twin screw granulation were investigated. Due to the high content of hydrophilic model drug, the granules prepared at a higher temperature with HPMC binding solution had the narrower size distribution and greater strength than the granules prepared with distilled water as a binding solution...
July 10, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28702519/bottom-up-hydrogen-deuterium-exchange-mass-spectrometry-data-analysis-and-interpretation
#10
Kerene A Brown, Derek J Wilson
Hydrogen Deuterium Exchange (HDX) Mass Spectrometry (MS) is a sensitive analytical technique that provides information on protein conformation and dynamics in solution. It is commonly used in the study of protein-ligand and protein-protein interactions and more recently in the pharmaceutical industry for epitope mapping, screening drug candidates and in the comparison of biopharmaceuticals to biosimilars. HDX-MS monitors the exchange of protein backbone hydrogen atoms with deuterium in solution. Recent advancements in HDX automation and data analysis, have taken the emphasis off developing a fundamental understanding of HDX, which is still lacking...
July 13, 2017: Analyst
https://www.readbyqxmd.com/read/28702073/mathematical-simulation-of-transport-kinetics-of-tumor-imaging-radiopharmaceutical-99m-tc-mibi
#11
O N Shevtsova, V K Shevtsova
The proposed model describes in a quality way the process of tumor-imaging radiopharmaceutical (99m)Tc-MIBI distribution with taking into account radiopharmaceutical accumulation, elimination, and radioactive decay. The dependencies of concentration versus the time are analyzed. The model can be easily tested by the concentration data of the radioactive pharmaceuticals in the blood measured at early time point and late time point of the scanning, and the obtained data can be used for determination of the washout rate coefficient which is one of the existing oncology diagnostics methods...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28699244/biophysical-characterization-of-layer-by-layer-synthesis-of-aptamer-drug-microparticles-for-enhanced-cell-targeting
#12
Kei X Tan, Michael K Danquah, Amandeep Sidhu, Sie Yon Lau, Clarence M Ongkudon
Targeted delivery of drug molecules to specific cells in mammalian systems demonstrates a great potential to enhance the efficacy of current pharmaceutical therapies. Conventional strategies for pharmaceutical delivery are often associated with poor therapeutic indices and high systemic cytotoxicity, and this results in poor disease suppression, low surviving rates, and potential contraindication of drug formulation. The emergence of aptamers has elicited new research interests into enhanced targeted drug delivery due to their unique characteristics as targeting elements...
July 11, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28690715/a-novel-aerodynamic-sizing-method-for-pharmaceutical-aerosols-using-image-based-analysis-of-settling-velocities
#13
Rami Fishler, Josué Sznitman
This article discusses a novel method to estimate aerodynamic particle size distributions (APSDs) of pharmaceutical aerosols through direct measurement of particle settling velocities using image-based analysis and particle tracking techniques. This simple, optical method provides accurate and fast measurements (approximately 1 minute) with few sources of bias due to specific device design choices or operation conditions. A proof-of-concept for the method is demonstrated by measuring APSDs for widely available commercial dry powder inhalers (DPIs), then comparing the results with previously published data from cascade impactors (CIs) and the Aerodynamic Particle Sizer (APS)...
June 2017: Inhalation
https://www.readbyqxmd.com/read/28688354/deriving-acute-and-chronic-predicted-no-effect-concentrations-of-pharmaceuticals-and-personal-care-products-based-on-species-sensitivity-distributions
#14
Wenxing Zhao, Bin Wang, Yujue Wang, Shubo Deng, Jun Huang, Gang Yu
Pharmaceuticals and personal care products (PPCPs), as emerging contaminants, have been detected in various environmental matrices and caused adverse effects on human health and the ecosystem. But water quality criterias (WQCs) of PPCPs for protecting aquatic environment are lacking, which hinders the environmental management of these emerging contaminants. In the present study, in order to support their WQC derivation, acute and chronic hazardous concentrations for 5% of species (HC5s) of some frequently detected PPCPs in China were calculated based on acute and chronic species sensitivity distributions (SSDs), respectively, using both parametric (log-normal and log-logistic) and nonparametric bootstrap approaches...
July 4, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28687052/borneol-a-novel-agent-that-improves-central-nervous-system-drug-delivery-by-enhancing-blood-brain-barrier-permeability
#15
Qun-Lin Zhang, Bingmei M Fu, Zhang-Jin Zhang
The clinical application of central nervous system (CNS) drugs is limited by their poor bioavailability due to the blood-brain barrier (BBB). Borneol is a naturally occurring compound in a class of 'orifice-opening' agents often used for resuscitative purposes in traditional Chinese medicine. A growing body of evidence confirms that the 'orifice-opening' effect of borneol is principally derived from opening the BBB. Borneol is therefore believed to be an effective adjuvant that can improve drug delivery to the brain...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28684025/statutory-health-insurance-in-germany-a-health-system-shaped-by-135-years-of-solidarity-self-governance-and-competition
#16
REVIEW
Reinhard Busse, Miriam Blümel, Franz Knieps, Till Bärnighausen
Bismarck's Health Insurance Act of 1883 established the first social health insurance system in the world. The German statutory health insurance system was built on the defining principles of solidarity and self-governance, and these principles have remained at the core of its continuous development for 135 years. A gradual expansion of population and benefits coverage has led to what is, in 2017, universal health coverage with a generous benefits package. Self-governance was initially applied mainly to the payers (the sickness funds) but was extended in 1913 to cover relations between sickness funds and doctors, which in turn led to the right for insured individuals to freely choose their health-care providers...
July 3, 2017: Lancet
https://www.readbyqxmd.com/read/28679382/ethnopharmacological-survey-of-home-remedies-used-for-treatment-of-hair-and-scalp-and-their-methods-of-preparation-in-the-west-bank-palestine
#17
Abdel Naser Zaid, Nidal Amin Jaradat, Ahmad Mustafa Eid, Hamzeh Al Zabadi, Abdulsalam Alkaiyat, Saja Adam Darwish
BACKGROUND: Natural products have many uses and purposes, including those linked to pharmaceutics and cosmetics. The aim of this study was to investigate the use of natural remedies for the treatment of hair and scalp disorders in the West Bank, Palestine. METHODS: An ethnopharmacological survey of herbal remedies and other natural products used in cosmetics and cosmeceuticals was carried out in the West Bank, Palestine. A questionnaire was distributed to 267 herbalists, traditional healers, hairdressers and rural dwellers...
July 5, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28679327/micro-factors-bringing-the-pharmaceutical-industry-to-a-seismic-shaking-a-qualitative-research
#18
Raphaela Marie Louisa Dierks, Olivier Bruyère, Jean-Yves Reginster
INTRODUCTION: Due to changing macro and micro factors, expiring patents and falling net income, pharmaceutical companies need to rethink their vertical business model. The trend shows cross-sectorial partnerships and consolidation to remain and compete on the market. Areas covered: Quantitative research interviewing a target group of 25 key executives from small, mid and large global pharmaceutical companies rounded with qualitative literature research completing the analysis. Expert commentary: Uncertainty in the industry due to changing external factors i...
July 14, 2017: Expert Review of Pharmacoeconomics & Outcomes Research
https://www.readbyqxmd.com/read/28679121/effects-of-extreme-rainfall-events-on-the-distribution-of-selected-emerging-contaminants-in-surface-and-groundwater-the-guadalete-river-basin-sw-spain
#19
Carmen Corada-Fernández, Lucila Candela, Nivis Torres-Fuentes, Marina G Pintado-Herrera, Maria Paniw, Eduardo González-Mazo
This study is focused on the Guadalete River basin (SW, Spain), where extreme weather conditions have become common, with and alternation between periods of drought and extreme rainfall events. Combined sewer overflows (CSOs) occur when heavy rainfall events exceed the capacity of the wastewater treatment plants (WWTP), as well as pollution episodes in parts of the basin due to uncontrolled sewage spills and the use of reclaimed water and sludge from the local WWTP. The sampling was carried out along two seasons and three campaigns during dry (March 2007) and extreme rainfall (April and December 2010) in the Guadalete River, alluvial aquifer and Jerez de la Frontera aquifer...
July 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28678201/characterization-of-danaparoid-complex-extractive-drug-by-an-orthogonal-analytical-approach
#20
Cristina Gardini, Elena Urso, Marco Guerrini, René van Herpen, Pauline de Wit, Annamaria Naggi
Danaparoid sodium salt, is the active component of ORGARAN, an anticoagulant and antithrombotic drug constituted of three glycosaminoglycans (GAGs) obtained from porcine intestinal mucosa extracts. Heparan sulfate is the major component, dermatan sulfate and chondroitin sulfate being the minor ones. Currently dermatan sulfate and chondroitin sulfate are quantified by UV detection of their unsaturated disaccharides obtained by enzymatic depolymerization. Due to the complexity of danaparoid biopolymers and the presence of shared components, an orthogonal approach has been applied using more advanced tools and methods...
July 5, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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