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https://www.readbyqxmd.com/read/29342234/stability-indicating-hplc-and-hptlc-methods-for-determination-of-agomelatine-and-its-degradation-products
#1
Maha M Abdelrahman, Ibrahim A Naguib, Mohamed R El Ghobashy, Nesma A Ali
Two accurate, sensitive and highly selective stability-indicating methods are developed and validated for simultaneous determination of Agomelatine (AGM) and its forced degradation products (Deg I and II). The first method is High-Performance Liquid Chromatography for separation and quantitation of AGM, Deg I and II on a C18 column (250 mm × 4.6 mm, 5 μm p.s) in isocratic mode by using a binary mixture of Potassium dihydrogen phosphate (0.05 M, pH adjusted to 2.9 with orthophosphoric acid): acetonitrile (60:40, v/v) at a flow rate of 2 mL/min...
January 12, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29342119/novel-hybrid-formulations-based-on-thiourea-derivatives-and-core-shell-fe%C3%A2-o%C3%A2-c18-nanostructures-for-the-development-of-antifungal-strategies
#2
Carmen Limban, Alexandru Vasile Missir, Miron Teodor Caproiu, Alexandru Mihai Grumezescu, Mariana Carmen Chifiriuc, Coralia Bleotu, Luminita Marutescu, Marius Toma Papacocea, Diana Camelia Nuta
The continuously increasing global impact of fungal infections is requiring the rapid development of novel antifungal agents. Due to their multiple pharmacological activities, thiourea derivatives represent privileged candidates for shaping new drugs. We report here the preparation, physico-chemical characterization and bioevaluation of hybrid nanosystems based on new 2-((4-chlorophenoxy)methyl)-N-(substituted phenylcarbamo-thioyl)benzamides and Fe₃O₄@C18 core@shell nanoparticles. The new benzamides were prepared by an efficient method, then their structure was confirmed by spectral studies and elemental analysis and they were further loaded on Fe₃O₄@C18 nanostructures...
January 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29342099/poly-lactic-acid-pla-based-tear-resistant-and-biodegradable-flexible-films-by-blown-film-extrusion
#3
Norma Mallegni, Thanh Vu Phuong, Maria-Beatrice Coltelli, Patrizia Cinelli, Andrea Lazzeri
Poly(lactic acid) (PLA) was melt mixed in a laboratory extruder with poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS) in the presence of polypropylene glycol di glycidyl ether (EJ400) that acted as both plasticizer and compatibilizer. The process was then scaled up in a semi-industrial extruder preparing pellets having different content of a nucleating agent (LAK). All of the formulations could be processed by blowing extrusion and the obtained films showed mechanical properties dependent on the LAK content...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29342093/hydroxyl-ion-diffusion-through-radicular-dentine-when-calcium-hydroxide-is-used-under-different-conditions
#4
Michael Cai, Paul Abbott, Jacqueline Castro Salgado
Calcium hydroxide's anti-bacterial action relies on high pH. The aim here was to investigate hydroxyl ion diffusion through dentine under different conditions. Teeth were divided into control (n = 4) and four experimental groups (n = 10): Group 1-no medicament; Group 2-Calmix; Group 3-Calmix/Ledermix; Group 4-Calasept Plus/Ledermix; Group 5-Pulpdent/smear layer. Deep (inner dentine) and shallow (outer dentine) cavities were cut into each root. pH was measured in these cavities for 12 weeks. The inner and outer dentine pH in Group 2 was significantly higher than all groups...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29342089/chitosan-gel-to-treat-pressure-ulcers-a-clinical-pilot-study
#5
Virginia Campani, Eliana Pagnozzi, Ilaria Mataro, Laura Mayol, Alessandra Perna, Floriana D'Urso, Antonietta Carillo, Maria Cammarota, Maria Chiara Maiuri, Giuseppe De Rosa
Chitosan is biopolymer with promising properties in wound healing. Chronic wounds represent a significant burden to both the patient and the medical system. Among chronic wounds, pressure ulcers are one of the most common types of complex wound. The efficacy and the tolerability of chitosan gel formulation, prepared into the hospital pharmacy, in the treatment of pressure ulcers of moderate severity were evaluated. The endpoint of this phase II study was the reduction of the area of the lesion by at least 20% after four weeks of treatment...
January 17, 2018: Pharmaceutics
https://www.readbyqxmd.com/read/29341979/wilson-s-disease-in-children-a-position-paper-by-the-european-society-for-paediatric-gastroenterology-hepatology-and-nutrition-committee
#6
Piotr Socha, Wojciech Janczyk, Anil Dhawan, Ulrich Baumann, Lorenzo D'Antiga, Stuart Tanner, Raffaele Iorio, Pietro Vajro, Roderick Houwen, Björn Fischler, Antal Dezsofi, Nedim Hadzic, Loreto Hierro, Jörg Jahnel, Valérie McLin, Valerio Nobili, Francoise Smets, Henkjan J Verkade, Dominique Debray
BACKGROUND: Clinical presentations of Wilson's disease (WD) in childhood ranges from asymptomatic liver disease to cirrhosis or acute liver failure, while neurological and psychiatric symptoms are rare. The basic diagnostic approach includes serum ceruloplasmin and 24h-urinary copper excretion. Final diagnosis of WD can be established using a diagnostic scoring system based on symptoms, biochemical tests assessing copper metabolism and molecular analysis of mutations in the ATP7B gene...
October 26, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/29341977/elemental-composition-at-silicone-hydrogel-contact-lens-surfaces
#7
Jessica Rex, Timothy Knowles, Xueying Zhao, Jessie Lemp, Cecile Maissa, Scott S Perry
OBJECTIVES: The outermost surface composition of 11 silicone hydrogel (SiHy) lenses was measured using X-ray photoelectron spectroscopy (XPS) to understand differences in wettability and potential interactions within an ocular environment. The SiHy lenses tested included balafilcon A, lotrafilcon A, lotrafilcon B, senofilcon A, comfilcon A, and somofilcon A reusable 2-week or monthly replacement lenses and delefilcon A, samfilcon A, narafilcon A, stenfilcon A, and somofilcon A daily disposable lenses...
January 15, 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29341952/a-pharmacological-review-leptadenia-reticulata-wight-arn-jivanti-the-real-life-giving-plant
#8
Jayesh M Dhalani, Pankaj B Nariya
The present review reveals a comprehensive description of various pharmacological studies carried out on Leptadenia reticulata, a source of several active compounds, i.e. Leptadenia reticulata plant belonging to family Asclepiadaceae, it is also known as 'Jivanti', used for the treatment of various ailments in human civilization as well as used in folk medicine as a remedy in various reported herbal formulations. The plant has been found to exhibit diverse pharmacological activities like antibacterial activity, anticancer activity, lactogenic eff ect, antioxidant activity, anti-implantation activity, anti-asthmatic activity, modulating eff ect, activity of silver nano particles, hepatoprotective activity, antifungal activity, antidiabetic activity and anti-infl ammatory activity...
December 20, 2017: Folia Medica
https://www.readbyqxmd.com/read/29341946/microemulgel-of-voriconazole-an-unfathomable-protection-to-counter-fungal-contagiousness
#9
Kalpesh C Ashara, Jalpa S Paun, Moinuddin M Soniwala, Jayant R Chavda
BACKGROUND: Fluconazole and ketoconazole both have poor minimum inhibitory concentration than voriconazole. Voriconazole had serious side effects in oral and intravenous doses. It has poor water solubility. The objective of the study was to prepare and optimize microemulgel of voriconazole for topical delivery. AIM: Formulation, development, and evaluation of voriconazole microemulgel for topical delivery. METHODS: Oil and emulsifi ers selected were on the basis of equilibrium solubility study and emulsification property respectively...
December 20, 2017: Folia Medica
https://www.readbyqxmd.com/read/29341922/sustained-release-timolol-maleate-loaded-ocusert-based-on-biopolymer-composite
#10
Revathy V Nair, Shefrin S, Akhil Suresh, Anoop K R, Sreeja C Nair
In the present investigation, the effect of timolol maleate loaded ocuserts was studied as an alternative for conventional anti-glaucoma formulation. Ocuserts were prepared using natural polymer sodium alginate and ethyl cellulose. Physico-chemical properties along with drug entrapment efficiency (94-98%), content uniformity (93.1% ± 0.264-98.00% ± 0.321), in vitro drug release (83.42% ± 0.35 at end of 12 hours), ex vivo permeation all showed satisfactory results, which was found to follow zero order kinetics...
January 13, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29341918/asymmetric-flow-field-flow-fractionation-for-the-characterization-of-globule-size-distribution-in-complex-formulations-a-cyclosporine-ophthalmic-emulsion-case
#11
Haiou Qu, Jiang Wang, Yong Wu, Jiwen Zheng, Yellela S R Krishnaiah, Mohammad Absar, Stephanie Choi, Muhammad Ashraf, Celia N Cruz, Xiaoming Xu
Commonly used characterization techniques such as cryogenic-transmission electron microscopy (cryo-TEM) and batch-mode dynamic light scattering (DLS) are either time consuming or unable to offer high resolution to discern the poly-dispersity of complex drug products like cyclosporine ophthalmic emulsions. Here, a size-based separation and characterization method for globule size distribution using an asymmetric flow field flow fractionation (AF4) is reported for comparative assessment of cyclosporine ophthalmic emulsion drug products (model formulation) with a wide size span and poly-dispersity...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341916/effects-of-surfactant-based-permeation-enhancers-on-mannitol-permeability-histology-and-electrogenic-ion-transport-responses-in-excised-rat-colonic-mucosae
#12
Sam Maher, Joanne Heade, Fiona McCartney, Seona Waters, Sinéad B Bleiel, David J Brayden
Surfactant-based intestinal permeation enhancers (PEs) are constituents of several oral macromolecule formulations in clinical trials. This study examined the interaction of a test panel of surfactant-based PEs with isolated rat colonic mucosae mounted in Ussing chambers in an attempt to determine if increases in transepithelial permeability can be separated from induction of mucosal perturbation. The aim was to assess the effects of PEs on (i) apparent permeability coefficient (Papp) of [14C]-mannitol on (ii) histology score and (iii) short-circuit current (ΔIsc) responses to a cholinomimetic (carbachol, CCh)...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341914/is-there-a-correlation-between-the-glass-forming-ability-of-a-drug-and-its-supersaturation-propensity
#13
Lasse Ingerslev Blaabjerg, Eleanor Lindenberg, Korbinian Löbmann, Holger Grohganz, Thomas Rades
The use of an enabling formulation technique, such as amorphization of a poorly water-soluble crystalline drug, can result in supersaturation with respect to the crystalline form of the drug and thus potentially in a higher degree of absorption after oral administration. The ease with which such drugs can be amorphized is known as their glass forming ability (GFA). In this study, a potential correlation between GFA and supersaturation propensity is investigated. The GFA of 23 different drugs was determined by melt quenching or milling the crystalline drugs to obtain their respective amorphous forms...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341913/characterisation-of-pore-structures-of-pharmaceutical-tablets-a-review
#14
REVIEW
Daniel Markl, Alexa Strobel, Rüdiger Schlossnikl, Johan Bøtker, Prince Bawuah, Cathy Ridgway, Jukka Rantanen, Thomas Rades, Patrick Gane, Kai-Erik Peiponen, J Axel Zeitler
Traditionally, the development of a new solid dosage form is formulation-driven and less focus is put on the design of a specific microstructure for the drug delivery system. However, the compaction process particularly impacts the microstructure, or more precisely, the pore architecture in a pharmaceutical tablet. Besides the formulation, the pore structure is a major contributor to the overall performance of oral solid dosage forms as it directly affects the liquid uptake rate, which is the very first step of the dissolution process...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341912/quantitative-estimation-of-phenytoin-sodium-disproportionation-in-the-formulations-using-vibration-spectroscopies-and-multivariate-methodologies
#15
Sathish Dharani, Ziyaur Rahman, Sogra F Barakh Ali, Hamideh Afrooz, Mansoor A Khan
Phenytoin sodium (PS) has tendency to convert to its base form; phenytoin base (PHT) during manufacturing, packaging, shelf life and in-use conditions that can influence its clinical performance. The objective of the present work was to develop a non-destructive, quick and easy analytical method for quantification of PHT in the drug product. A formulation was prepared containing the excipients present in the commercial capsule formulation of PS. Formulation containing either 100% PHT or PS was prepared and these formulations were mixed in different proportion to achieve 0-100% PHT matrices...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341910/isomalt-and-its-diastereomer-mixtures-as-stabilizing-excipients-with-freeze-dried-lactate-dehydrogenase
#16
Anna-Kaisa Tuderman, Clare J Strachan, Anne M Juppo
The purpose of this research was to study isomalt as a protein-stabilizing excipient with lactate dehydrogenase (LDH) during freeze-drying and subsequent storage and compare it to sucrose, a standard freeze-drying excipient. Four different diastereomer mixtures of isomalt were studied. The stability of the protein was studied with a spectrophotometric enzyme activity test and circular dichroism after freeze-drying and after 21 days of storage at 16% RH. Physical stability was analyzed with differential scanning calorimetry and Karl Fischer titration...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341900/lamotrigine-loaded-poly-%C3%A9-d-l-lactide-co-caprolactone-nanoparticles-as-brain-delivery-system
#17
Hussein O Ammar, Mahmoud M Ghorab, Azza A Mahmoud, Iman M Higazy
Management of epilepsy requires brain delivery therapy, therefore, this study was aimed to prepare lamotrigine loaded poly-ɛ-(d,l-lactide-co-caprolactone) (PLCL) nanoparticles using spontaneous emulsification solvent diffusion method. Nanoparticles for brain delivery required to have a particle size <200 nm, polydispesity index <0.2 and a sustained drug release properties. For such aim different factors were considered in preparing the nanoparticles as PLCL monomers' ratio, type of organic solvent used to prepare the nanoparticles, amount of PLCL and Pluronic®F127 in the nanoparticles...
January 13, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29341857/development-of-visibility-forecasting-modelling-framework-for-the-lower-fraser-valley-of-british-columbia-using-canada-s-regional-air-quality-deterministic-prediction-system
#18
Rita So, Andrew Teakles, Jonathan Baik, Roxanne Vingarzan, Keith Jones
Visibility degradation, one of the most noticeable indicators of poor air quality, can occur despite relatively low levels of particulate matter when the risk to human health is low. The availability of timely and reliable visibility forecasts can provide a more comprehensive understanding of the anticipated air quality conditions to better inform local jurisdictions and the public. This paper describes the development of a visibility forecasting modelling framework, which leverages the existing air quality and meteorological forecasts from Canada's operational Regional Air Quality Deterministic Prediction System (RAQDPS) for the Lower Fraser Valley of British Columbia...
January 17, 2018: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/29341814/utilizing-a-rat-delayed-implantation-model-to-teach-integrative-endocrinology-and-reproductive-biology
#19
Rodney D Geisert, Michael F Smith, Amanda L Schmelzle, Jonathan A Green
In this teaching laboratory, the students are directed in an exercise that involves designing and performing an experiment to determine estrogen's role in regulating delayed implantation (diapause) in female rats. To encourage active participation by the students, a discussion question is provided before the laboratory exercise in which each student is asked to search the literature and provide written answers to questions and to formulate an experiment to test the role of ovarian estrogen in inducing implantation in female rats...
March 1, 2018: Advances in Physiology Education
https://www.readbyqxmd.com/read/29341663/conditional-hybrid-nonclassicality
#20
E Agudelo, J Sperling, L S Costanzo, M Bellini, A Zavatta, W Vogel
We derive and implement a general method to characterize the nonclassicality in compound discrete- and continuous-variable systems. For this purpose, we introduce the operational notion of conditional hybrid nonclassicality which relates to the ability to produce a nonclassical continuous-variable state by projecting onto a general superposition of discrete-variable subsystem. We discuss the importance of this form of quantumness in connection with interfaces for quantum communication. To verify the conditional hybrid nonclassicality, a matrix version of a nonclassicality quasiprobability is derived and its sampling approach is formulated...
September 22, 2017: Physical Review Letters
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