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 different characteristics of lactose carrier employed, and considered specifically the powder fluidisation, entrainment and de-agglomeration mechanisms. A GSK Rotahaler(®) was selected as the inhaler device. Powder fluidisation and entrainment were investigated using the ensemble technique of laser diffraction and high-speed imaging. This ensemble technique afforded both the powder entrainment profile and simultaneous visual confirmation of the capsule movement and powder fluidisation within the Rotahaler. The results showed that powder fluidisation from a dynamic split capsule was substantially different to that from a static powder bed. Furthermore, the presence of the split capsule dominated powder emission mechanisms from the Rotahaler, regulated by its impaction on the grid/Rotahaler wall and the rotational movement in the entrained air. Of all the material characterisation metrics, the most significant linear correlation was revealed between powder permeability and the aerosolisation efficiency as measured by fine particle fraction (R(2)=0.98). This indicates that drug delivery from the Rotahaler was mainly governed by the influence of the cohesive fine particle size component. Powder permeability as a practical test may afford an effective and practical predictive link between the raw excipients and drug delivery performance from the capsule device.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Sim S,Margo K,Parks J,Howell R,Hebbink GA,Orlando L,Larson I,Leslie P,Ho L,Morton DAdoi
10.1016/j.ijpharm.2014.08.038subject
Has Abstractpub_date
2014-12-30 00:00:00pages
351-60issue
1-2eissn
0378-5173issn
1873-3476pii
S0378-5173(14)00604-8journal_volume
477pub_type
杂志文章abstract：:The stratum corneum possesses a very heterogenous structure. As such a diffusing molecule can access a number of different pathways. It is probable that the excellent barrier properties of the stratum corneum result from a tortuous diffusional pathway around the dead cells. However, there are considerable problems in ...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(99)00161-1
更新日期：1999-10-15 00:00:00
abstract：:The objective of the present study was to synthesize and investigate the transgene expression efficacy of quaternized derivatives of aminoglycoside polymers in different cancer cell lines. A series of glycidyltrimethylammonium chloride (GTMAC) derivatives of aminoglycoside polymers (GTMAC-AM polymers), containing vary...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2015.04.026
更新日期：2015-07-15 00:00:00
abstract：:Floating (F) microcapsules containing melatonin (MT) were prepared by the ionic interaction of chitosan and a negatively charged surfactant, sodium dioctyl sulfosuccinate (DOS). The DOS/chitosan complex formation was confirmed employing infrared spectroscopy, differential scanning calorimetry (DSC), solubility and X-r...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(02)00396-4
更新日期：2002-12-05 00:00:00
abstract：:Hydrochlorothiazide (HCTZ) 60 mg strength tablets containing commonly used excipients and hydroxypropyl cellulose, marketed as either Klucel-EF (HPC, NF from Hercules, USA) or HPC-L (HPC, NF from Nippon Soda, Japan), as a binder were manufactured using identical aqueous wet granulation process. The tablets containing ...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2005.10.011
更新日期：2006-02-03 00:00:00
abstract：:The aim of the current study was to improve the knowledge of drug-glycol-phospholipid-interactions and their effects in lamellar vesicle suitability as drug delivery systems. Liposomes were prepared using hydrogenated soy phosphatidylcholine (P90H, 60 mg/ml) and diclofenac sodium salt at two concentrations (5-10 mg/ml...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2013.08.034
更新日期：2013-11-01 00:00:00
abstract：:Low drug loading, burst effect during release and drug inactivation account for the main drawbacks of protein microencapsulation in poly(d,l-lactic-co-glycolic) acid (PLGA) matrix by the water-in oil-in water (W/O/W) solvent evaporation method. Thus, the current study was set to invest the critical attributes of formu...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2015.01.008
更新日期：2015-03-01 00:00:00
abstract：:The aim of the current study is the evaluation of a recently optimized SEDDS, composed of Solutol HS15 and medium chain glycerides, and self-emulsifying pellets by means of ESR. Tempol-benzoate (TB)-loaded SEDDS were produced and electron spin resonance (ESR) spectroscopy was used to evaluate the diluted self-emulsify...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2008.09.014
更新日期：2009-02-09 00:00:00
abstract：:The potential of gels formed in situ by dilute aqueous solutions of a xyloglucan polysaccharide derived from tamarind seed as sustained release vehicles for percutaneous administration of non-steroidal anti-inflammatory drugs has been assessed by in vitro and in vivo studies. Chilled aqueous solutions of xyloglucan th...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(02)00394-0
更新日期：2002-10-10 00:00:00
abstract：:The epidural administration is used commonly in the treatment of pain. Nonsteroidal anti-inflammatory drugs, especially ibuprofen, would have potential in epidural use. Like many epidurally useful drugs it, however, has a short duration of action, which is a limiting factor. To improve epidural pain treatment, a long-...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(00)00376-8
更新日期：2000-04-10 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
abstract：:Biocompatible and thermosensitive poly(organophosphazenes) with a lower critical solution temperature (LCST) below body temperature have been designed with the aim for the local delivery of peptide and protein drugs. These polymers could be synthesized by introducing short chain tri- or tetraethylene glycol as a hydro...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2006.02.009
更新日期：2006-05-11 00:00:00
abstract：:This study explored the transition of lamellar-type liquid crystal (LLC) to biocompatible oil-in-water nanoemulsions able to modify benznidazole (BNZ) release and target the drug to cells infected with the T. cruzi parasite. Three cosolvents (2methylpyrrolidone [NMP], polyethylene glycol [POL], and propylene glycol [P...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2018.11.041
更新日期：2019-01-30 00:00:00
abstract：:The objective of this study was to gain insights into the structural integrity of PLGA during an ammonolysis-based microencapsulation process. PLGA (lactide:glycolide ratio=75:25; M(w)=25,925 g/mol) was dissolved in ethyl acetate or isopropyl formate (3-6 ml), which was emulsified in an aqueous phase. Ammonia, being a...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2011.07.022
更新日期：2011-10-31 00:00:00
abstract：:Methyl methacrylate (MMA) copolymers have recently been proposed as an alternative in controlled-release matrix tablets. The aims of this study were to assess the potential value of these copolymers as direct compression excipients and to investigate relationships between the physical and structural properties of the ...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(02)00432-5
更新日期：2002-11-06 00:00:00
abstract：:The present study evaluates the effect of L-leucine concentration and operating parameters of a laboratory spray dryer on characteristics of trehalose dry powders, with the goal of optimizing production of these powders for inhaled drug delivery. Trehalose/L-leucine mixtures were spray dried from aqueous solution usin...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2019.03.004
更新日期：2019-05-01 00:00:00
abstract：:Low-frequency Raman (LFR) spectroscopy probes vibrational modes related to long-range order (i.e., crystallinity) that can provide unique information on the solid-state/structural characteristics among other properties. Furthermore, the recent advancements in instrumentation (most notably, narrow wavelength band filte...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2020.120034
更新日期：2021-01-05 00:00:00
abstract：:The aim of the present work was to develop and assess the potential of nanostructured lipid carriers (NLCs) loaded with methotrexate as a new approach for topical therapy of psoriasis. Methotrexate-loaded NLCs were prepared via a modified hot homogenization combined with ultrasonication techniques using either polysor...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2014.10.067
更新日期：2014-12-30 00:00:00
abstract：:The purpose of the present study was to investigate the effects of molecular weight (MW) of polyvinylpyrrolidone (PVP) on glass transition and crystallization of sucrose. Thus, sucrose was co-lyophilized with 2.5 and 5.0% w/w PVP of different molecular weights, which were characterized using gel permeation chromatogra...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(01)00613-5
更新日期：2001-05-07 00:00:00
abstract：OBJECTIVE:The aim of the study was to observe the characteristic of permeation of capsaicin across jejunum, ileum and colon in the rat, and to investigate the role of transient receptor potential cation channel (TRPV1). The interaction of capsaicin with P-glycoprotein (P-gp), multidrug resistance-associated protein 2 (...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2013.02.007
更新日期：2013-03-10 00:00:00
abstract：:Poly(methyl methacrylate) (PMMA) is used to fill the gap between the prosthesis and the surrounding bone in cemented arthroplasties. Biocompatibility problems related to bone cement application limit the clinical success of these cemented arthroplasties. Being the cement surface in close connection with the living bon...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2004.03.011
更新日期：2004-06-18 00:00:00
abstract：:Lopinavir (LVR) is extensively metabolized by CYP3A4 and is prevented from entering the cells by membrane efflux pumps such as P-gp and MRP2. In an approach to evade the first-pass metabolism and efflux of LVR, peptide prodrugs of LVR [valine-valine-lopinavir (VVL) and glycine-valine-lopinavir (GVL)] were synthesized....
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2008.03.031
更新日期：2008-07-09 00:00:00
abstract：:The model anti-inflammatory drug prednisolone (PS) was retained in chitosan (CS) gel beads, which were prepared in a 10% aqueous amino acid solution (pH 9.0). Sustained release of PS from the CS gel beads was observed. Carrageenan solution was injected into air pouches (AP), which were prepared subcutaneously on the d...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2003.11.036
更新日期：2004-03-19 00:00:00
abstract：:The aim of this study was to investigate the ability of L-leucine (LL) in preventing moisture-induced deterioration in the in vitro aerosolization performance of spray-dried (SD) salbutamol sulfate (SS). Increasing mass fraction of LL (5-80%) were co-spray dried with SS, and the physicochemical properties of the powde...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2017.07.033
更新日期：2017-09-15 00:00:00
abstract：:Administration of drugs via the oral route is the most common and preferred route due to its ease of administration, cost-effectiveness and flexibility in design. However, if the drug being administered has limited aqueous solubility it can result in poor bioavailability. Furthermore, the low pH of the stomach as well...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2015.11.029
更新日期：2016-01-30 00:00:00
abstract：:A series of new, low molecular mass, lysine-based peptide dendrimers with varying distribution of cationic and aromatic groups in the structure were synthesized. They expressed antimicrobial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria as well as against fungal p...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2005.10.039
更新日期：2006-02-17 00:00:00
abstract：:The main objective of the study was to evaluate if the liquid crystalline cubic phase gel of glyceryl monooleate (GMO) protects insulin from agitation induced aggregation. The aggregation of Humulin(R), Regular Iletin I(R) and Regular Iletin II(R), in cubic phase GMO gels at 30 U/g of gel was compared with that in PBS...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(99)00288-4
更新日期：1999-11-25 00:00:00
abstract：:N-(2-Hydroxypropyl) methacrylamide (HPMA) copolymer has been extensively studied as drug carrier for tumor therapy. Due to the Enhanced Permeability and Retention (EPR) effect, HPMA copolymer drug conjugates are able to be passively accumulated in the tumor site. Currently, efficient uptake of this polymeric system by...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2017.12.018
更新日期：2018-01-30 00:00:00
abstract：:Dry powder inhalers (DPIs) are widely used to deliver respiratory medication as a fine powder. This study investigates the physical mechanism of DPI operation, assessing the effects of geometry, inhalation and powder type on dose fluidisation. Patient inhalation through an idealised DPI was simulated as a linearly inc...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2008.03.038
更新日期：2008-06-24 00:00:00
abstract：:The purpose of the present study is to prepare chemically and physically stable rhEGF/poloxamer gel and to investigate its possibility of ophthalmic delivery. The rhEGF/HP-beta-CD complex markedly increased rhEGF stability compared with rhEGF solution at 4 degrees C. The poloxamer gel was composed of poloxamer 407 (16...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/s0378-5173(01)00933-4
更新日期：2002-02-21 00:00:00
abstract：:A multilayer mat for dispensing colistin sulfate through a body surface was prepared by electrospinning. The fabricated system comprised various polyvinyl alcohol fibrous layers prepared with or without the active ingredient. One of the electrospun layers contained water-soluble colistin sulfate and the other was prep...
journal_title：International journal of pharmaceutics
pub_type： 杂志文章
doi：10.1016/j.ijpharm.2017.03.044
更新日期：2017-05-15 00:00:00
