Abstract:
:The role of water activity (a(w)), relative humidity (RH) and temperature on the hydration state of theophylline has been investigated. Slurry bridging experiments at controlled water activities, using powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA) to characterise the solid phase, established that the hydrate is the thermodynamically stable form of theophylline at a(w) > or = 0.5 at 4 degrees C, a(w) > or = 0.64 at 30 degrees C, and a(w) > or = 0.76 at 40 degrees C. These data were used to produce a phase stability diagram for anhydrous/hydrate theophylline versus temperature. Anhydrous theophylline was spray dried in an attempt to reduce crystallinity. The spray dried theophylline was stored at a range of temperatures (4-40 degrees C) and humidities (22-89% RH). Samples were analysed at 3, 6, 9, 26 and 52 weeks using TGA and at the 26 and 52 weeks by PXRD. The solid state stability of the spray dried theophylline closely correlated to the phase stability diagram produced using the slurry bridging experiments. The data suggest that the slurry bridging technique at controlled water activities provides an accurate method of rapidly predicting the physically stable form in anhydrous/hydrate systems.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Ticehurst MD,Storey RA,Watt Cdoi
10.1016/s0378-5173(02)00277-6keywords:
subject
Has Abstractpub_date
2002-10-24 00:00:00pages
1-10issue
1-2eissn
0378-5173issn
1873-3476pii
S0378517302002776journal_volume
247pub_type
杂志文章abstract::The purpose of this investigation was to evaluate the performance of poly (amidoamine) (PAMAM) dendrimers, with three different surface groups, to be used as drug carriers. Drug-dendrimers complexes were investigated for solubility studies, dissolution studies, in vitro drug release studies, and for stability studies....
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2010.12.002
更新日期:2011-02-28 00:00:00
abstract::The aim of this work was to evaluate the potentiality to control the drug release of a new architecture of microparticles organized at the nanoscopic scale by assembling polymeric nanocapsules at the surface of drug-loaded xerogels. Xerogel was prepared by sol-gel method using sodium diclofenac, as hydrophilic drug mo...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2008.02.005
更新日期:2008-06-24 00:00:00
abstract::This work investigates the dispersion performance of fine lactose particles as function of processing time, and compares it to the API, using Beclomethasone Dipropionate (BDP) as model API. The total load of fine particles is kept constant in the formulations while the proportions of API and lactose fines are varied. ...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2016.03.004
更新日期:2016-05-17 00:00:00
abstract::This study aims to improve understanding of the powder fluidisation and aerosolisation processes unique to a split capsule dry powder inhaler. It uses a combination of dynamic real-time methods and a suite of powder material physicochemical characterisation methods. The study focused on examining the effect of differe...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2014.08.038
更新日期:2014-12-30 00:00:00
abstract::The purpose of this work is to prepare a formulation using mannitol coupling Camptothecin (CPT) nanoparticles (CPT-NPs) to circumvent the difficult solubilization practice based on central composite experimental statistical design. CPT-NPs were prepared with a high-pressure homogenization technique method. The indepen...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2014.02.019
更新日期:2014-04-25 00:00:00
abstract::In situ amorphization is a concept that allows to amorphize a given drug in its final dosage form right before administration. Hence, this approach can potentially be used to circumvent recrystallization issues that other amorphous formulation approaches are facing during storage. In this study, the feasibility of mic...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2017.01.035
更新日期:2017-03-15 00:00:00
abstract::Isooctyl p-methoxycinnamate(OMC) is a commonly used chemical ultraviolet B sunscreen that suffers rapid degradation with current delivery systems following sun exposure. In this study, deoxycholate-mediated liposome (DOC-LS) endocytosis was employed to improve the antioxidation effects of OMC following topical adminis...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2015.10.010
更新日期:2015-12-30 00:00:00
abstract::The objective of this study was to examine the use of transdermal iontophoresis for the delivery of ranitidine hydrochloride in children. Constant, direct current, anodal iontophoresis of ranitidine was performed in vitro across dermatomed pig skin. The effect of donor vehicle, current intensity, and drug concentratio...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2012.03.006
更新日期:2012-10-01 00:00:00
abstract::The first interlaboratory testing of electronic taste sensing systems was performed within five participating centers, each working with the Insent (Insent Inc., Atsugi-Shi, Japan) e-tongue. Preparation of the samples for the comprised four experiments, shipping of the samples and evaluation of the results was perform...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2014.02.036
更新日期:2014-08-05 00:00:00
abstract::Cyclosporine A (CsA) is a well-known immunosuppressive agent used as rescue therapy in severe steroid-refractory ulcerative colitis (UC). However, toxicity issues associated with CsA when administered in its commercially available formulations have been reported in clinical practice. Since nanotechnology has been prop...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2016.03.012
更新日期:2016-04-30 00:00:00
abstract::The number of active pharmaceutical substances having high therapeutic potential but low water solubility is constantly increasing, making it difficult to formulate these compounds as oral dosage forms. The solubility and dissolution rate, and thus potentially the bioavailability, of these poorly water-soluble drugs c...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章,评审
doi:10.1016/j.ijpharm.2012.04.066
更新日期:2013-08-30 00:00:00
abstract::This work presents a simple and fast method for the simultaneous determination of amiloride and furosemide by digital derivative spectrophotometry. HCl 1 x 10(-2) mol/l dissolved in ethanol was used as solvent and to extract drugs from formulations. Subsequently the samples were evaluated directly by first digital der...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/s0378-5173(02)00482-9
更新日期:2002-12-05 00:00:00
abstract::Viscous liquid degradable polymers have advantages as drug depots for sustained protein delivery. We have created a new aliphatic polycarbonate for this purpose, poly(trimethylene carbonate-co-5-hydroxy trimethylene carbonate), which upon degradation retains a near neutral micro-environmental pH. As such, this copolym...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2020.119965
更新日期:2020-11-30 00:00:00
abstract::An innovative strategy of fabricating uniform spore like drug particles to improve pulmonary drug delivery efficiency was disclosed in the present study. Spore like particles were prepared through combination of high gravity controlled precipitation and spray drying process with insulin as model drug first, showing ro...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2012.03.044
更新日期:2012-07-01 00:00:00
abstract::Three novel amino acid based anionic amphiphilic copolymers poly(sodium N-acryloyl-l-valinate-co-alkylacrylamide) (where, alkyl=octyl and dodecyl) with either 9 or 16 mol% hydrophobic substitution were synthesized. These hydrophobically modified polyelectrolytes (HMPs), above a critical concentration, self-assemble in...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2011.01.041
更新日期:2011-04-04 00:00:00
abstract::The aim of this work was to formulate a powder for inhalation with fusafungine, a drug substance initially highly cohesive. The classical approach based on micronization by jet milling to prepare respirable drug particles and then blending with a carrier was first applied. A fractional factorial experimental design wa...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2006.05.009
更新日期:2006-09-14 00:00:00
abstract::Bioadhesive buccal tablet formulations for delivery of nicotine into the oral cavity were developed. Carbomer (Carbopol)974P NF) (CP) and alginic acid sodium salt (NaAlg) were used as bioadhesive polymers in combination with hydroxypropyl methylcellulose (HPMC) at different ratios. Magnesium carbonate was incorporated...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2003.10.040
更新日期:2004-06-11 00:00:00
abstract::The stability of solid dispersions (SD) during storage is of concern. We prepared the pH-modulated SD (pSD) and compressed tablets consisting of polyethylene glycol (PEG) 6000 as a carrier, drug and MgO (alkalizer). Telmisartan (TEL), an ionizable poorly water-soluble drug, was chosen as a model drug. The changes in p...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2011.04.065
更新日期:2011-07-29 00:00:00
abstract::The melting point of lidocaine was significantly lowered when mixed with thymol and/or aqueous ethanol. Mixtures of lidocaine and thymol at ratios within the range of 30:70-70:30 (w:w) became homogeneous oils at 25 degrees C. In a pH 9.2 carbonate buffer containing 25% ethanol, lidocaine (5%, w:w) also liquefied at 25...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/s0378-5173(01)00689-5
更新日期:2001-07-03 00:00:00
abstract::DNA as a novel biomaterial can be used to fabricate different kinds of DNA nanostructures based on its principle of GC/AT complementary base pairing. Studies have shown that DNA nanostructure is a nice drug carrier to overcome big obstacles existing in cancer therapy such as systemic toxicity and unsatisfied drug effi...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章,评审
doi:10.1016/j.ijpharm.2017.09.032
更新日期:2017-11-25 00:00:00
abstract::Cationic polyphosphoesters (PPEs) with different side-chain charge groups were designed and synthesized as biodegradable gene carriers. Poly(N-methyl-2-aminoethyl propylene phosphate) (PPE-MEA), with a secondary amino group (-CH(2)CH(2)NHCH3) side chain released DNA in several hours at N/P (amino group of polymer to p...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2003.07.006
更新日期:2003-10-20 00:00:00
abstract::The purpose of this study was to investigate the dispersal mechanism of retinol (Vitamin A, VA) into phospholipid. VA was dispersed with soybean phosphatidylcholine (PC) using sonication and the dispersal mechanism was evaluated by characterizing the dispersed particles using dynamic light scattering, fluorescence spe...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/s0378-5173(02)00677-4
更新日期:2003-03-06 00:00:00
abstract::Conventional manufacturing of pharmaceutical tablets often involves single processes such as blending, granulation, milling and direct compression. A process that minimizes and incorporates all these in a single continuous step is desirable. The concept of omitting milling step followed by direct-molding of tablets ut...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2013.12.053
更新日期:2014-03-10 00:00:00
abstract::CHF5633 (Chiesi Farmaceutici, Italy) is a synthetic pulmonary surfactant currently under clinical development for the treatment of Respiratory Distress Syndrome in premature infants. The product is composed of phospholipids in liposomal organization, together with two peptide analogues of human surfactant proteins B a...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2018.10.045
更新日期:2018-12-20 00:00:00
abstract::Previously, PTX/Pluronic F127 nanocrystals were prepared in our laboratory using the stabilization of nanocrystals (SNC) method. For PTX nanocrystals, dosages could be increased to yield improved antitumor activity over Taxol without incidence of acute toxicity. The objectives of this current study are to further unde...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2010.02.013
更新日期:2010-05-10 00:00:00
abstract::The objective of this study was to determine, using a Caco-2 cell monolayer model, the extent to which the paracellular and transcellular routes are altered by citicholine (CDP-Ch) and DMSO in the presence of human serum albumin (HSA). The apparent permeability (Papp) of mannitol in the presence of 4% (w/v) HSA was in...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/s0378-5173(02)00588-4
更新日期:2003-01-30 00:00:00
abstract::A method to measure thermo-mechanical properties of pharmaceutical and polymeric powders was developed. The measurements are conducted by characterizing the material's response to applied acoustic waves. Measurements were performed using griseofulvin, felodipine and indomethacin as model drugs and polyethylene oxide (...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2010.06.001
更新日期:2010-08-30 00:00:00
abstract::The role of solvents in drug transport has not been properly addressed in the literature, despite its well known influence on drug permeation. Previously we have conducted thermodynamic and kinetic analyses to probe the molecular mechanisms of alcohol enhanced permeation. In the present study, the influence of tempera...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2011.08.037
更新日期:2011-11-28 00:00:00
abstract::The present investigation aims at formulating lipid based drug delivery system of β-Artemether and Lumefantrine and comparative pharmacological evaluation with innovator formulation. Commercial modified oil and indigenous natural fatty acids comprised the oily phase in developing lipidic formulation of β-Artemether an...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2013.07.033
更新日期:2013-10-15 00:00:00
abstract::The aim of the study was to prepare inhalable resveratrol by spray drying for the treatment of chronic obstructive pulmonary disease (COPD). Resveratrol, with a spherical morphology and particle diameter less than 5 μm, was successfully manufactured. Fine particle fraction (FPF) and mass median aerodynamic diameter (M...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2015.06.033
更新日期:2015-08-01 00:00:00