Abstract：
:The degradation kinetics of gonadorelin were investigated systematically with reversed-phase high-performance liquid chromatography. The stability-indicating properties of this system were checked with photodiode array detection and by comparison with capillary zone electrophoretic analysis. Influences of gonadorelin concentration, pH, temperature, buffer ions, and ionic strength on the degradation kinetics were studied. The pH-log Kobs profile can be divided into three parts, a proton, a solvent, and a hydroxyl-catalyzed section, with different degradation products. These degradation products were characterized by mass using LC-MS. Gonadorelin is most stable at pH 5-5.5 with a half-life of 70 days at 70 degrees C. The overall degradation rate constant as a function of the temperature under acidic and alkaline conditions obeys the Arrhenius equation. The gonadorelin concentration and the concentrations of acetate, phosphate, borate, and carbonate buffer have no influence on the decomposition rate of the analyte. Increasing ionic strength led to higher Kobs at pH 2 and lower Kobs at pH 9, but influences were relatively small.
journal_name
J Pharm Scijournal_title
Journal of pharmaceutical sciencesauthors
Hoitink MA,Beijnen JH,Bult A,van der Houwen OA,Nijholt J,Underberg WJdoi
10.1021/js9601187subject
Has Abstractpub_date
1996-10-01 00:00:00pages
1053-9issue
10eissn
0022-3549issn
1520-6017pii
S0022-3549(15)50153-6journal_volume
85pub_type
杂志文章abstract：:The objective of the present research was to investigate the stability of an amorphous drug, Delta(9)-tetrahydrocannabinol (THC) in polymer-based transmucosal systems. THC was incorporated in polyethylene oxide and hydroxypropylcellulose matrices by a hot-melt fabrication procedure, utilizing various processing aids. ...
journal_title：Journal of pharmaceutical sciences
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journal_title：Journal of pharmaceutical sciences
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journal_title：Journal of pharmaceutical sciences
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更新日期：1998-09-01 00:00:00
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abstract：:Dissolution profiles are classified in accordance with the shape of fractional dissolution rate function. This function is constant in time for the classical first-order model and, in this case, the dissolution is described by a monoexponential function. Therefore, any deviation of the fractional dissolution rate from...
journal_title：Journal of pharmaceutical sciences
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doi：10.1002/jps.10419
更新日期：2003-08-01 00:00:00
abstract：:The possibility tht metronidazole exerts several of its biological actions via interaction with important metal ions was investigated. NMR spectroscopy and polarography (ac) were used to test for any interaction, to locate the probable sites for complexation, and to determine the molecular stoichiometry of any complex...
journal_title：Journal of pharmaceutical sciences
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abstract：:The biphasic degradation of delta9-tetrahydrocannabinol (I), as monitored by flame-ionization GLC, produced delta8-tetrahydrocannabinol (II), cannabidiol (X), 9-hydroxyhexahydrocannabinol (VI), 9,10-dihydro-9-hydroxyisocannabidiol (VI), and and 6,12-dihydro-6-hydroxycannabidiol (VIII) in acidic solutions. Further iden...
journal_title：Journal of pharmaceutical sciences
pub_type： 杂志文章
doi：10.1002/jps.2600670108
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更新日期：1993-06-01 00:00:00
abstract：:The objective of this study was to generate a water-soluble thiolated chitosan to enable the permeation-enhancing effect of chitosan at pH of at least 5.5 without losing the advantages of improved mucoadhesive properties. Therefore, the thiol-bearing polyoxyethylene ligand {O-(3-carboxylpropyl)-O'-[2-[3-mercaptopropio...
journal_title：Journal of pharmaceutical sciences
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更新日期：2014-02-01 00:00:00
abstract：:The in vitro uptake study was performed using the isolated cells of human oral mucosa, buccal and the dorsum of the tongue, to investigate the mechanisms of glucose uptake. The uptake of D-glucose was much larger in cells of the dorsum of the tongue than in buccal cells and was inhibited more extensively by 2-deoxy-D-...
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journal_title：Journal of pharmaceutical sciences
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更新日期：2005-08-01 00:00:00
abstract：:Two previously reported but unidentified phenylburazone degradation products were isolated from a tablet that was stored at 60 degrees for 203 days. The compounds, alpha-(N-phenylcarbamoyl)-N-caproylhydrazobenzene and alpha-hydroxy-alpha-(N-phenylcarbamoyl)-N-caproylhydrazobenzene, were isolated by chromatography, ide...
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abstract：:The binding of representative chemical classes of nonsteroidal anti-inflammatory drugs (NSAIDs) to human serum albumin (HSA) was investigated by equilibrium dialysis. Warfarin enantiomers were used as specific markers in displacement studies. Data were analyzed by a computerized nonlinear least squares approach design...
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abstract：:Literature data relevant to the decision to waive in vivo bioequivalence testing for the approval of generic immediate release solid oral dosage forms of proguanil hydrochloride are reviewed. To elucidate the Biopharmaceutics Classification System (BCS) classification, experimental solubility and dissolution studies w...
journal_title：Journal of pharmaceutical sciences
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更新日期：2018-07-01 00:00:00
abstract：:The salting in and salting out of the nonionic surfactant octoxynol NF by halides of ammonium and the four lowest symmetrical tetraalkylammonium cations were investigated by measuring their effect on the cloud point at various salt concentrations. The chloride anion tended to salt the surfactant out, lowering its clou...
journal_title：Journal of pharmaceutical sciences
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abstract：:Compact strength and the particle-size distribution of milled roller compacted compacts were correlated to the slope of the best-fit line through near-infrared spectra for samples prepared under different roll speeds and feed rates. The above correlations were found to hold for compacts prepared from microcrystalline ...
journal_title：Journal of pharmaceutical sciences
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abstract：:A study was undertaken to develop a method that could be used an an indication of the absorption of steroids. It was demonstrated that 17-hydroxycorticosteroids in urine could be quantitatively determined via absorptivity values obtained through the use of standard hydrocortisone-alcohol solutions or standard solution...
journal_title：Journal of pharmaceutical sciences
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更新日期：1975-06-01 00:00:00
abstract：:5-aminolevulinic acid (ALA) is used as a precursor of protoporphyrin IX (PpIX) for photodynamic therapy (PDT) of superficial skin cancers and subcutaneous metastases of internal malignancies. The permeability of ALA across intact skin is always low, making it difficult to achieve the desired therapeutic benefits. Henc...
journal_title：Journal of pharmaceutical sciences
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更新日期：2006-04-01 00:00:00
abstract：:Bilateral adrenalectomy (10 days) increased the monoamine oxidase activity of the rat heart, vas deferens, spleen, superior cervical ganglion, and hypothalamus but not that of the rest of the brain, kidney, and liver. Experiments were made to determine whether the increased activity was due to neurogenic influences an...
journal_title：Journal of pharmaceutical sciences
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更新日期：1976-01-01 00:00:00
