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https://www.readbyqxmd.com/read/29458205/developing-a-stable-aqueous-enteric-coating-formulation-with-hydroxypropyl-methylcellulose-acetate-succinate-hpmcas-mf-and-colloidal-silicon-dioxide-as-anti-tacking-agent
#1
Tanvi M Deshpande, Anisul Quadir, Sakae Obara, Ahmed Ibrahim, Stephen W Hoag
The purpose of this study was to use statistical design of experiments to develop a stable aqueous enteric coating formulation containing stabilizing excipients, such as polyethylene glycol that can minimize hydroxypropyl methylcellulose acetate succinate aggregation and minimize spray-nozzle clogging at elevated processing temperatures. The mechanisms of stabilization (i.e. charge stabilization and molecular interactions) were studied by performing zeta potential and FTIR studies. Electrostatic stabilization by sodium lauryl sulfate and hydrogen bonding by polyethylene glycol provided dispersion stability and yielded a stable aqueous coating formulation that prevented spray-nozzle clogging...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29441468/a-novel-approach-for-dry-powder-coating-of-pellets-with-ethylcellulose-part-ii-evaluation-of-caffeine-release
#2
Beatrice Albertini, Cecilia Melegari, Serena Bertoni, Luisa Stella Dolci, Nadia Passerini
The objective of this study was to assess the efficacy and the capability of a novel ethylcellulose-based dry-coating system to obtain prolonged and stable release profiles of caffeine-loaded pellets. Lauric and oleic acids at a suitable proportion were used to plasticize ethylcellulose. The effect of coating level, percentage of drug loading, inert core particle size, and composition of the coating formulation including the anti-sticking agent on the drug release profile were fully investigated. A coating level of 15% w/w was the maximum layered amount which could modify the drug release...
February 13, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29433714/malignant-pleural-effusion-from-diagnostics-to-therapeutics
#3
REVIEW
Rachelle Asciak, Najib M Rahman
Malignant pleural effusion is a common complication of cancer and denotes a poor prognosis. It usually presents with dyspnea and a unilateral large pleural effusion. Thoracic computed tomography scans and ultrasound are helpful in distinguishing malignant from benign effusions. Pleural fluid cytology is diagnostic in about 60% of cases. In cytology-negative disease, pleural biopsies are helpful. Current management is palliative. Previously, first-line treatment for recurrent symptomatic malignant pleural effusion was chest drain insertion and talc pleurodesis, with indwelling pleural catheter insertion reserved for patients with trapped lung or failed talc pleurodesis...
March 2018: Clinics in Chest Medicine
https://www.readbyqxmd.com/read/29403549/observational-analysis-on-inflammatory-reaction-to-talc-pleurodesis-small-and-large-animal-model-series-review
#4
Jacopo Vannucci, Guido Bellezza, Alberto Matricardi, Giulia Moretti, Antonello Bufalari, Lucio Cagini, Francesco Puma, Niccolò Daddi
Talc pleurodesis has been associated with pleuropulmonary damage, particularly long-term damage due to its inert nature. The present model series review aimed to assess the safety of this procedure by examining inflammatory stimulus, biocompatibility and tissue reaction following talc pleurodesis. Talc slurry was performed in rabbits: 200 mg/kg checked at postoperative day 14 (five models), 200 mg/kg checked at postoperative day 28 (five models), 40 mg/kg, checked at postoperative day 14 (five models), 40 mg/kg checked at postoperative day 28 (five models)...
January 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29400793/methods-for-quantitative-infrared-directional-hemispherical-and-diffuse-reflectance-measurements-using-an-ftir-and-a-commercial-integrating-sphere
#5
Thomas A Blake, Timothy J Johnson, Russell G Tonkyn, Brenda M Forland, Tanya L Myers, Carolyn S Brauer, Yin-Fong Su, Bruce E Bernacki, Leonard Hanssen, Gerardo Gonzalez
We have developed methods to measure the directional-hemispherical (ρ) and diffuse (ρd) reflectances of powders, liquids, and disks of powders and solid materials using a commercially available, matte gold-coated integrating sphere and Fourier transform infrared spectrometer. To determine how well the sphere and protocols produce quantitative reflectance data, measurements were made of three diffuse and two specular standards prepared by the National Institute of Standards and Technology (NIST), LabSphere Infragold and Spectralon standards, hand-loaded sulfur and talc powder samples, and water...
January 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29372539/assessment-of-plant-probiotic-performance-of-novel-endophytic-bacillus-sp-in-talc-based-formulation
#6
Jasim Basheer, Aswani Ravi, Jyothis Mathew, Radhakrishnan Edayileveettil Krishnankutty
Endophytic bacteria are considered to have a plethora of plant growth promoting and anti-phytopathogenic traits to live within the plants. Hence, they have immense promises for plant probiotic development. In the current study, plant probiotic endophytic Bacillus sp. CaB5 which has been previously isolated from Capsicum annuum was investigated for its performance in talc-based formulation. For this, CaB5 was made into formulation with sterile talc, calcium carbonate, and carboxymethyl cellulose. The viability analysis of the formulation by standard plate count and fluorescence methods has confirmed the stable microbial count up to 45 days...
January 25, 2018: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/29359509/survivin-is-a-negative-prognostic-factor-in-malignant-pleural-effusion
#7
Elena Arellano-Orden, Beatriz Romero-Romero, Verónica Sánchez-López, José Martín-Juan, Francisco Rodríguez-Panadero, Remedios Otero-Candelera
BACKGROUND: Survivin is a well-known member of the inhibitor of apoptosis family, and has been related to increased tumour aggressivity, both in tissue and in pleural fluid. OBJECTIVES: In patients with malignant pleural effusion, we sought to investigate the changes in pleural fluid survivin concentrations induced by talc instillation into the pleural space. Those changes were also examined in relation to pleurodesis outcome and patient survival. METHODS: We investigated 84 patients with malignant pleural effusion who underwent talc pleurodesis...
January 23, 2018: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29353472/rapid-and-precise-measurement-of-the-hydrogen-isotope-composition-of-phyllosilicates-by-continuous-flow-oa-icos
#8
John A Mering, Shaun L L Barker
New methodology is presented for analyzing hydrogen isotope ratios (D/H) in phyllosilicate minerals by laser absorption spectroscopy. D/H measurements were carried out using an OA-ICOS instrument operated in a continuous flow configuration. Water was extracted from minerals in a high temperature quartz column and advanced to the analyzer in a dry air carrier gas stream. We report the first D/H measurements by a laser system for serpentine, muscovite, sericite, talc, and biotite. We also measure kaolinite, gypsum, and small volumes of water...
January 20, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29337668/solving-manufacturing-problems-for-l-carnitine-l-tartrate-to-improve-the-likelihood-of-successful-product-scale-up
#9
Aliaa A Badawi, Mahmoud M Hegazy, Dina Louis, Mohammed A Eldegwy
L-carnitine-L-tartrate, a non-essential amino acid, is hygroscopic. This causes a problem in tablet production due to pronounced adhesion of tablets to punches. A 33 full factorial design was adopted to suggest a tablet formulation. Three adsorbents were suggested (Aerosil 200, Aerosil R972, talc) to reduce stickiness at three concentrations (1, 3 and 5 %), and three fillers (mannitol, Avicel PH 101, Dibasic calcium phosphate) were chosen to prepare 27 formulations. Micromeritic properties of formulations were studied, and tablets were prepared by wet granulation...
December 20, 2017: Acta Pharmaceutica
https://www.readbyqxmd.com/read/29334386/organic-inorganic-hybrids-having-a-talc-like-structure-as-suitable-hosts-to-guest-a-wide-range-of-species
#10
J Brendlé
The sol-gel process involving hydrolysis and condensation reactions is an attractive way to form siloxane based hybrid materials since it is a one-step method performed under mild conditions. Organic-inorganic hybrids having a talc-like structure (TLH) can be obtained using this procedure starting from organotrialkoxysilanes having the formula R-Si(OR')3 (where R stands for an organic moiety and R' for a methyl or ethyl group) with different functionalities, an aqueous or ethanolic solution of a magnesium salt, and in some cases, an aqueous solution of sodium hydroxide...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29331896/environmentally-available-hexavalent-chromium-in-soils-and-sediments-impacted-by-dispersed-fly-ash-in-sarigkiol-basin-northern-greece
#11
Nerantzis Kazakis, Nikolaos Kantiranis, Kyriaki Kalaitzidou, Efthimia Kaprara, Manassis Mitrakas, Robert Frei, George Vargemezis, Dimitrios Vogiatzis, Anastasios Zouboulis, Anestis Filippidis
Hexavalent chromium is one of the most toxic and carcinogenic species known and can be released into the environment from several sources. In Sarigkiol basin (N Greece) the presence of Cr(VI) in soil, sediments and groundwater may originate from both natural (ophiolitic rocks and their weathering products) and anthropogenic (dispersed fly ash produced from lignite power plants) sources. In this study, the distribution of contents and origin of environmentally available Cr(VI) in soils, sediments, regoliths and fly ash of Sarigkiol basin is presented...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29320805/success-rate-of-medical-thoracoscopy-and-talc-pleurodesis-in-malignant-pleurisy-a-single-centre-experience
#12
Joke Leemans, Christophe Dooms, Vincent Ninane, Jonas Yserbyt
BACKGROUND AND OBJECTIVE: Malignant pleurisy is associated with advanced oncological disease and dyspnoea is the most common presenting symptom. Pleurodesis is the preferred palliative and supportive treatment option, targeting symptom relief. The identification of clinical and endoscopic features that determine the success of talc pleurodesis in malignant pleurisy could guide clinical decision-making. METHODS: All symptomatic patients with malignant pleurisy subjected to talc pleurodesis through medical thoracoscopy between January 2012 and December 2015 were included...
January 10, 2018: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/29312753/review-of-malignant-pleural-mesothelioma-survival-after-talc-pleurodesis-or-surgery
#13
REVIEW
Emanuela Taioli, Maaike van Gerwen, Meredith Mihalopoulos, Gil Moskowitz, Bian Liu, Raja Flores
Malignant pleural mesothelioma (MPM) is an aggressive tumor and the prognosis is still dismal despite the various proposed multimodal treatment plans. Currently, new palliative treatments, such as talc pleurodesis, are being explored besides traditional surgery. This review reports survival rates after talc pleurodesis in comparison to surgery in patients with malignant pleural mesothelioma. A systematic literature search yielded 49 articles eligible for this review. The mean survival in the talc pleurodesis group was 14 months compared to 17 and 24 months for the pleurectomy decortication (P/D) group and extrapleural pneumonectomy (EPP) group, respectively...
December 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29306327/improved-mycelia-and-polysaccharide-production-of-grifola-frondosa-by-controlling-morphology-with-microparticle-talc
#14
Ting-Lei Tao, Feng-Jie Cui, Xiao-Xiao Chen, Wen-Jing Sun, Da-Ming Huang, Jinsong Zhang, Yan Yang, Di Wu, Wei-Min Liu
BACKGROUND: Mushroom showed pellet, clump and/or filamentous mycelial morphologies during submerged fermentation. Addition of microparticles including Talc (magnesium silicate), aluminum oxide and titanium oxide could control mycelial morphologies to improve mycelia growth and secondary metabolites production. Here, effect of microparticle Talc (45 μm) addition on the mycelial morphology, fermentation performance, monosaccharide compositions of polysaccharides and enzymes activities associated with polysaccharide synthesis in G...
January 6, 2018: Microbial Cell Factories
https://www.readbyqxmd.com/read/29303848/response-to-letter-to-the-editor-on-the-mortality-of-talc-miners-and-millers-from-val-chisone-northern-italy
#15
Enrico Pira, Maurizio Coggiola, Catalina Ciocan, Canzio Romano, Carlo La Vecchia, Claudio Pelucchi, Paolo Boffetta
No abstract text is available yet for this article.
January 2018: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29300171/universal-deformation-pathways-and-flexural-hardening-of-nanoscale-2d-material-standing-folds
#16
Helio Chacham, Ana Barboza, Alan B de Oliveira, Camilla Oliveira, Ronaldo Batista, Bernardo Ruegger Almeida Neves
In the present work, we use atomic force microscopy nanomanipulation of 2D-material standing folds to investigate their mechanical deformation. Using graphene, h-BN and talc nanoscale wrinkles as testbeds, universal force-strain pathways are clearly uncovered and well-accounted for by an analytical model. Such universality further enables the investigation of each fold bending stiffness κ as a function of its characteristic height h0. We observe a more than tenfold increase of κ as h0 increases in the 10-100 nm range, with power-law behaviors of κ versus h0 with exponents larger than unity for the three materials...
January 4, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29261577/description-of-particle-size-distribution-and-behavior-of-talc-preparations-commercially-available-within-the-united-states
#17
Christopher R Gilbert, Benjamin R Furman, David J Feller-Kopman, Philippe Haouzi
BACKGROUND: Widespread use of talc pleurodesis remains controversial for many providers concerned by adverse events such as respiratory failure, which are sometimes fatal. Particle talc size has been implicated in these adverse effects, mainly on the basis of animal studies utilizing large amounts of talc or in observational studies performed on different continents with different talc preparations and doses. Our aim was to determine the particle size and distribution of only the commercially available US-talc preparations and whether the fluid content can affect this distribution...
January 2018: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/29233769/historical-evolution-of-regulatory-standards-for-occupational-and-consumer-exposures-to-industrial-talc
#18
REVIEW
Derek A Drechsel, Christy A Barlow, Jennifer L Bare, Neva F Jacobs, John L Henshaw
Talc has been used historically in a wide range of industrial applications and consumer products. The composition and purity of talc used for industrial purposes can vary greatly depending on the source and may contain asbestos minerals. The developing science associated with the health risks of asbestos had an effect on the talc industry throughout the 20th century. This review presents a detailed analysis of the evolution of regulatory standards impacting the use of industrial talc in the U.S. from the early 20th century through the 1990s...
December 9, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29225889/efficacy-of-sonographic-and-biological-pleurodesis-indicators-of-malignant-pleural-effusion-simple-protocol-of-a-randomised-controlled-trial
#19
Ioannis Psallidas, Hania E G Piotrowska, Ahmed Yousuf, Nikolaos I Kanellakis, Gayathri Kagithala, Seid Mohammed, Lei Clifton, John P Corcoran, Nicky Russell, Melissa Dobson, Robert F Miller, Najib M Rahman
Introduction: Malignant pleural effusion (MPE) is common and currently in UK there are an estimated 50 000 new cases of MPE per year. Talc pleurodesis remains one of the most popular methods for fluid control. The value of thoracic ultrasound (TUS) imaging, before and after pleurodesis, in improving the quality and efficacy of care for patients with MPE remains unknown. Additionally, biomarkers of successful pleurodesis including measurement of pleural fluid proteins have not been validated in prospective studies...
2017: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/29221288/pleurodesis-a-comparison-of-two-sclerosing-agents-for-pleural-effusions-in-mozambique
#20
Ivo Figueiredo, Anilsa Cossa, Anila Hassane, José Sousa, Joaquim Pondo, João Teixeira, Kevan Akrami, Susannah K Graves, Atul Malhotra, Elizabete A Nunes
Background: Pleural effusions constitute one of the most frequent pathologies encountered in the pulmonary service of Maputo Central Hospital (MCH) in Mozambique. Bleomycin and talc are commonly used for pleurodesis, but cost prohibitive, therefore we aimed to retrospectively compare the efficacy and safety of sodium hydroxide (NaOH) with bleomycin for pleurodesis. Methods: Case records of pleurodesis using bleomycin and NaOH from 2002 to 2013 were reviewed. Standard of care for pleurodesis for recurrent pleural effusions at MCH was developed using the materials available...
September 2017: Journal of Thoracic Disease
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