Abstract:
:Magnetic nanoparticles are useful as contrast agents for magnetic resonance imaging (MRI). Paramagnetic contrast agents have been used for a long time, but more recently superparamagnetic iron oxide nanoparticles (SPIOs) have been discovered to influence MRI contrast as well. In contrast to paramagnetic contrast agents, SPIOs can be functionalized and size-tailored in order to adapt to various kinds of soft tissues. Although both types of contrast agents have a inducible magnetization, their mechanisms of influence on spin-spin and spin-lattice relaxation of protons are different. A special emphasis on the basic magnetism of nanoparticles and their structures as well as on the principle of nuclear magnetic resonance is made. Examples of different contrast-enhanced magnetic resonance images are given. The potential use of magnetic nanoparticles as diagnostic tracers is explored. Additionally, SPIOs can be used in diagnostic magnetic resonance, since the spin relaxation time of water protons differs, whether magnetic nanoparticles are bound to a target or not.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Rümenapp C,Gleich B,Haase Adoi
10.1007/s11095-012-0711-ysubject
Has Abstractpub_date
2012-05-01 00:00:00pages
1165-79issue
5eissn
0724-8741issn
1573-904Xjournal_volume
29pub_type
杂志文章,评审abstract::The use of nanoparticulate pharmaceutical carriers to enhance the in vivo efficiency of many drugs well established itself over the past decade both in pharmaceutical research and clinical setting. The current level of engineering pharmaceutical nanocarriers in some cases allows for drug delivery systems (DDS) to demo...
journal_title:Pharmaceutical research
pub_type: 社论
doi:10.1007/s11095-007-9463-5
更新日期:2007-12-01 00:00:00
abstract::Various derivatives of the C-terminal amide group in N-protected amino acid and peptide amides were synthesized to assess their suitability as prodrug forms with the aim of protecting the amide or peptide bond against cleavage by alpha-chymotrypsin. Whereas N-acetylation, N-hydroxymethylation, and N-phthalidylation di...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015854718903
更新日期:1991-12-01 00:00:00
abstract:PURPOSE:Nonlinear conjugation metabolic rate of valproic acid (VPA) has been speculated previously from plasma elimination and liver concentration of VPA in guinea pigs. The purposes of the present study were to assess our speculation by direct measurement of VPA glucuronidation rate in vitro. METHODS:VPA at various c...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1016028707130
更新日期:1996-08-01 00:00:00
abstract:PURPOSE:Recombinant human serum albumin (rHSA), secreted by a Pichia pastoris expression system, was purified by a fast and efficient method, the essential feature of which is strong but reversible binding of the protein to Blue Sepharose. The structural characteristics, stability, and ligand-binding properties of the ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1013391001141
更新日期:2001-12-01 00:00:00
abstract:PURPOSE:To examine the inhibitory potential of enalapril [and other angiotensin converting enzyme (ACE) inhibitors] on glycylsarcosine (GlySar) transport by the high-affinity renal peptide transporter. METHODS:Studies were performed in rabbit renal brush border membrane vesicles in which the uptake of radiolabeled Gly...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018847818766
更新日期:1999-05-01 00:00:00
abstract:PURPOSE:The objective of this study was to determine the pharmacokinetics and safety for NX1838 following injection into the vitreous humor of rhesus monkeys. METHODS:Plasma and vitreous humor pharmacokinetics were determined following a single bilateral 0.25, 0.50, 1.0, 1.5, or 2.0 mg/eye dose. In addition, the pharm...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1007657109012
更新日期:2000-12-01 00:00:00
abstract::Leucine enkephalin (YGGFL) undergoes rapid degradation in sheep nasal mucosa to yield GGFL which is further degraded to FL. The activity of the nasal mucosal homogenate against YGGFL and GGFL (t1/2 12 and 7 min) was significantly greater than that observed with a nasal wash fluid (t1/2 40 and 13 min). The effect of cy...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018946829225
更新日期:1994-12-01 00:00:00
abstract:PURPOSE:Empirical formulae relate the mean size of primary droplets from jet and ultrasonic nebulizers to a fluid's physicochemical properties. Although the size selective "filtering" effects of baffling and evaporation may modify the secondary aerosol produced, this research sought to evaluate whether viscosity and su...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1016205520044
更新日期:1995-11-01 00:00:00
abstract::Nucleoside transporters play a critical role in the absorption, disposition, and targeting of therapeutically used nucleosides and nucleoside analogs. This review is focused on the Na(+)-dependent, concentrative nucleoside transporters which are found in a variety of cells including renal, intestinal and hepatic epith...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1023/a:1012113931332
更新日期:1997-11-01 00:00:00
abstract::The in situ rat gut technique was used to study the effects of hypothermia on the intestinal absorption of a 1 mg/ml solution of sodium pentobarbital in 0.01 M phosphate buffer (pH 6.0). Male Sprague-Dawley rats weighing between 300 and 370 g were exposed to an atmosphere of helox (helium:oxygen, 80:20) at 0-4 degrees...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1016416413780
更新日期:1987-06-01 00:00:00
abstract:PURPOSE:Grapefruit juice (GJ) is known to increase the oral bioavailability of many CYP3A-substrates by inhibiting intestinal phase-I metabolism. However, the magnitude of AUC increase is often insignificant and highly variable. Since we earlier suggested that CYP3A and P-glycoprotein (P-gp) form a concerted barrier to...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1011902625609
更新日期:1999-04-01 00:00:00
abstract::The pharmacokinetics of and biologic response modification by recombinant human interferon-beta ser (rIFN-beta ser) were evaluated in 12 healthy male volunteers. Subjects received a single intravenous (iv) injection of 90 x 10(6) IU of rIFN-beta ser followed by a single or eight consecutive daily 90 x 10(6) IU subcuta...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018902120023
更新日期:1993-04-01 00:00:00
abstract:PURPOSE:Excipients are added to lyophilized protein drug formulations to protect the protein during processing and storage, but the mechanisms are poorly understood. Here, hydrogen/deuterium (H/D) exchange with mass spectrometry was used to assess protein conformation and excipient interactions in lyophilized solids. ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-007-9365-6
更新日期:2008-02-01 00:00:00
abstract::Intranasal route continues to be one of the main focuses of drug delivery research. Although it is generally perceived that the nasal route could avoid the first-pass metabolism in liver and gastrointestinal tract, the role of metabolic conversions in systemic and brain-targeted deliveries of the parent compounds and ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-010-0127-5
更新日期:2010-07-01 00:00:00
abstract:PURPOSE:To identify High Molecular Weight Products (HMWP) formed in human insulin formulation during storage. METHODS:Commercial formulation of human insulin was stored at 37°C for 1 year and HMWP was isolated using preparative size exclusion chromatography (SEC) and reverse phase (RP) chromatography. The primary stru...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-014-1600-3
更新日期:2015-06-01 00:00:00
abstract:PURPOSE:Since a previous qualitative study carried out by us showed the existence of an important influence of the particle size on the percolation thresholds and taking into account that the existing theoretical models can only provide qualitative explanation to this influence, the purpose of this work is to carry out...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1016088424993
更新日期:1996-03-01 00:00:00
abstract::This study utilized different statistical techniques to evaluate the reliability (internal consistency) and the discriminant validity of the most widely used measures of organizational commitment and intention to quit (the employing organization). Data were obtained from a national mail survey of members of the Americ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018930718979
更新日期:1994-01-01 00:00:00
abstract:PURPOSE:To show, using a model study, how electronic structure theory can be applied in combination with LC/UV/MS/MS for the prediction and identification of oxidative degradants. METHODS:The benzyloxazole 1, was used to represent an active pharmaceutical ingredient for oxidative forced degradation studies. Bond disso...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/b:pham.0000041469.96466.12
更新日期:2004-09-01 00:00:00
abstract::The pharmacokinetics of methylergometrine were investigated in the rat, with emphasis on the role of biliary excretion and enterohepatic recirculation in the overall disposition of the drug. A linked-rat model, where the bile from a rat receiving a constant rate of iv infusion of methylergometrine was allowed to flow ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015871122537
更新日期:1990-01-01 00:00:00
abstract:PURPOSE:Some therapeutic peptides exhibit amyloidogenic properties that cause insolubility and cytotoxicity against neuronal cells in vitro. Here, we characterize the conformational change in monomeric therapeutic peptide to its fibrillar aggregate in order to prevent amyloidogenic formation during clinical application...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/b:pham.0000033016.36825.2c
更新日期:2004-07-01 00:00:00
abstract::Penetration of various compounds through shed snake skin was measured in vitro to examine the effect of lipophilicity and molecular size of a compound on permeability through this model membrane. The permeabilities were found to be controlled by the lipophilicity and the molecular size of the permeant. The smaller and...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015902308676
更新日期:1990-12-01 00:00:00
abstract::Physicochemical effects caused by intestinal fluids on drugs in the gastrointestinal (GI) tract can be a contributing factor in food induced changes in bioavailability. To identify physicochemical properties of gemfibrozil that may be altered by endogenous and dietary lipids, in vitro studies were conducted in model s...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018967401000
更新日期:1994-12-01 00:00:00
abstract:PURPOSE:Monocarboxylate transporter (MCT) inhibition represents a potential treatment strategy for γ-hydroxybutyric acid (GHB) overdose by blocking its renal reabsorption in the kidney. This study further evaluated the effects of a novel, highly potent MCT inhibitor, AR-C155858, on GHB toxicokinetics/toxicodynamics (TK...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-014-1583-0
更新日期:2015-06-01 00:00:00
abstract::Molecular modeling has been used to study the complexation between alpha, beta, or gamma-cyclodextrin (CD) and a group of amine compounds having the diphenylmethyl functionality. The computer program SYBYL 5.3 and the Tripos force field (version 5.2) were used for all the calculations. Three-dimensional structures of ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015816215751
更新日期:1991-10-01 00:00:00
abstract:PURPOSE:The gadopentetic acid (Gd-DTPA)-loaded chitosan nanoparticles (Gd-nanoCPs) were prepared for gadolinium neutron-capture therapy (Gd-NCT) and characterized and evaluated as a device for intratumoral (i.t.) injection. METHODS:Gd-nanoCPs were prepared by a novel emulsion-droplet coalescence technique. The effects...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1018995124527
更新日期:1999-12-01 00:00:00
abstract:PURPOSE:The United States Pharmacopoeia (USP) imposes strict requirements on the geometry and operating conditions of the USP Dissolution Testing Apparatus II. A previously validated Computational Fluid Dynamics (CFD) approach was used here to study the hydrodynamics of USP Apparatus II when the impeller was placed at ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-007-9477-z
更新日期:2008-02-01 00:00:00
abstract::The hair follicle, hair shaft, and sebaceous gland collectively form what is recognized as the pilosebaceous unit. This complex, three-dimensional structure within the skin possesses a unique biochemistry, metabolism and immunology. Recent studies have focused on the hair follicle as a potential pathway for both local...
journal_title:Pharmaceutical research
pub_type: 杂志文章,评审
doi:10.1023/a:1016250422596
更新日期:1995-02-01 00:00:00
abstract:PURPOSE:The aim was to design and thoroughly characterize monodisperse Fe3O4@SiO2-Ag nanoparticles with strong antibacterial properties, which makes them a candidate for targeting bacterial infections. METHODS:The monodisperse Fe3O4 nanoparticles were prepared by oleic acid-stabilized thermal decomposition of Fe(III) ...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1007/s11095-019-2680-x
更新日期:2019-08-14 00:00:00
abstract::The pentahydrate (alpha form) of cefazolin sodium (CEZ) exhibited sharp X-ray diffraction peaks, while the dehydrated alpha form showed weak but distinct diffraction peaks. As expected the amorphous form exhibited a diffuse and halo diffraction pattern. The X-ray procedure to estimate the degree of crystallinity of CE...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/a:1015984300692
更新日期:1988-07-01 00:00:00
abstract:PURPOSE:To determine whether LHRH-receptor is expressed in Calu-3, a human bronchial epithelial cell line, and to further determine whether this receptor plays a role in the transport of deslorelin, an LHRH agonist. METHODS:Using cultured monolayers of Calu-3 grown at air-interface, the presence and localization of LH...
journal_title:Pharmaceutical research
pub_type: 杂志文章
doi:10.1023/b:pham.0000029294.70707.74
更新日期:2004-06-01 00:00:00