abstract：:The relationship of glutamate acid decarboxylase (GAD) activity with the reaction products was developed. It was based on incubating sodium glutamate substrate (S) with GAD enzyme (E) when the enzyme-substrate-complex (ES) product was obtained along with gamma aminobutyric acid (GABA) and unreacted sodium glutamate. T...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Sethi ML

更新日期：1999-05-01 00:00:00

abstract：:There are few methods available for the rapid and precise quantitation of non-covalent aggregation. The very methods used to measure the aggregation can easily disrupt the weak forces holding an aggregate together. This paper describes the novel application of free solution capillary electrophoresis (CE) for the quant...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Clodfelter DK,Nussbaum MA,Reilly J

更新日期：1999-04-01 00:00:00

abstract：:A gradient high-performance liquid chromatographic (HPLC) method was developed for the analysis of Synercid freeze-dried powder in routine quality control, stability and compatibility studies. This method is suited for a simultaneous assay of drug substances and impurities. The method was validated for precision, repr...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Vasselle B,Gousset G,Bounine JP

更新日期：1999-04-01 00:00:00

abstract：:The application of potentiometric biosensors based on membrane ion-selective electrodes for flow injection analysis (FIA) is presented. The biosensors have been obtained by covalent binding of enzyme molecules directly to surface of ion-selective membranes. The biosensor/FIA systems enable the determination of urea an...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Koncki R,Wałcerz I,Leszczyńska E

更新日期：1999-03-01 00:00:00

abstract：:The supposed 5-LO inhibitory activity of two N-omega-ethoxycarbonyl-4-quinolones was tested determining leukotriene B4 (LTB4) in RBL-1 cell cultures, pretreated with the two compounds of interest. LTB4, obtained by solid-phase extraction (SPE) from cell cultures supernatants, was determined by micellar electrokinetic ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Bossù E,Aglianò AM,Desideri N,Sestili I,Porrà R,Grandilone M,Quaglia MG

更新日期：1999-03-01 00:00:00

abstract：:The aim of the present work was to develop a method for predicting the phase behaviour of four component systems consisting of oil, water and two surfactants from a limited number of screening experiments. Investigations were conducted to asses the potential of artificial neural networks (ANNs) with back-propagation t...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Alany RG,Agatonovic-Kustrin S,Rades T,Tucker IG

更新日期：1999-03-01 00:00:00

abstract：:Automated column-switching HPLC methods were developed and utilized for the direct analyses of three hydroxamic acid based metalloprotease inhibitors in rat plasma. These column-switching methods involved the use of a restricted-access media (RAM) precolumn and a column-switching valve, allowing the complete automatio...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Peng SX,Strojnowski MJ,Bornes DM

更新日期：1999-03-01 00:00:00

abstract：:An electrochemical method for quantifying beta-lactam antibiotics (cephalexin and ampicillin) and their hydrolysis products is described. Cyclic voltammetry at the water/nitrobenzene interface in a four-electrode system was used. The zwitterionic compounds were ionized to the necessary electrochemical form by pH adjus...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Basáez L,Vanýsek P

更新日期：1999-02-01 00:00:00

abstract：:Sub-micron sized domains of a carbon surface are derivatized with antibodies using biotin/avidin technology. These sites are spatially-segregated from, and directly adjacent to, electron transfer sites on the same electrode surface. The distance between these electron transfer sites and enzyme-loaded domains are kept ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Dontha N,Nowall WB,Kuhr WG

更新日期：1999-02-01 00:00:00

abstract：:An LC/MS/MS assay was developed and successfully used to quantitate vesnarinone and its principal metabolites (OPC-8230, OPC-18136, and OPC-18137) in human plasma and urine. Samples were pre-treated with liquid-solid extraction followed by simultaneous monitoring of primary and daughter ions which were used for the id...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Tata PN,Schorno KS,Cowart TD,Bramer SL

更新日期：1999-01-01 00:00:00

abstract：:A methylene blue (MB) poly(vinyl chloride) membrane sensor based on MB-silicotungstate (SLT) ion association as electroactive material was described. The linear response covered the range 1 x 10(-3)-1 x 10(-6) mol x dm(-3) MB solution, with a slope 52.0+/-0.8 mV decade(-1) (pH range 3.0-10.0). The detection limit was ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Wen ML,Zhao YB,Chen X,Wang CY

更新日期：1999-01-01 00:00:00

abstract：:A rapid, simple assay procedure was developed for simultaneous analysis of aspirin (ASA) and salicylic acid (SA) in aspirin delayed-release tablet formulation by 'zero crossing' second-derivative UV spectrophotometry. The zero-order absorption spectra and second derivative spectra of ASA and SA were recorded in diluti...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Kokot Z,Burda K

更新日期：1998-12-01 00:00:00

abstract：:Cationic capillary isotachophoresis (ITP) with conductometric detection has been used for separating and determining milligram amounts of tramadol [2-dimethylaminomethyl-1-(3-methoxyphenyl)-cyclohexanol hydrochloride] (I) in seven commercial mass-produced pharmaceutical preparations. The optimised ITP electrolyte syst...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Pospísilová M,Polásek M,Jokl V

更新日期：1998-12-01 00:00:00

abstract：:The analysis of gentamicin by liquid chromatography using a column packed with poly(styrene-divinylbenzene) and pulsed electrochemical detection on a gold electrode is described. The mobile phase consists of an aqueous solution containing sodium sulfate, tetrahydrofuran, sodium 1-octanesulfonate and a phosphate buffer...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Adams E,Roelants W,De Paepe R,Roets E,Hoogmartens J

更新日期：1998-12-01 00:00:00

abstract：:One of the first examples of a bienzymatic organic phase enzyme electrode (OPEE) is described. It was obtained using two enzymes (phospholipase D and choline oxidase), both immobilised in kappa-Carrageenan gel and, as electrochemical transducer, an amperometric gas diffusion electrode for oxygen. The response of the b...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Campanella L,Pacifici F,Sammartino MP,Tomassetti M

更新日期：1998-12-01 00:00:00

abstract：:The retention of 44 barbituric acid derivatives was determined on porous graphitized carbon (PGC) column using dioxane water mixtures as eluents. Linear correlations were calculated between the logarithm of the capacity factor and the dioxane concentration in the eluent. Free Wilson analysis combined with stepwise reg...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Forgács E,Cserháti T

更新日期：1998-12-01 00:00:00

abstract：:Salmeterol xinafoate is the first of a new class of long acting, selective beta2-adrenoceptor agonists introduced for the treatment of asthma. The major metabolite of salmeterol in the dog has been identified as the 3-catechol sulphate of the benzoic acid derivative. This metabolite was isolated from dog bile and was ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Bowers GD,Bayliss MK,Donnelly MC,Fellows I,Ismail IM,Mookherjee CR

更新日期：1998-11-01 00:00:00

abstract：:Two simple sensitive and accurate methods have been developed for the determination of ritodrine hydrochloride in bulk and pharmaceutical preparations. The first method involves the direct measurement of the native fluorescence of the drug in the concentration range 4-9 microg ml(-1), the second method is based on the...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Razak OA

更新日期：1998-11-01 00:00:00

abstract：:A high-performance liquid chromatographic method for the simultaneous determination of magnesium ascorbyl phosphate (I), imidazolidinylurea (II), a mixture of methyl-(III), ethyl-(IV), propyl-(V), butyl-(VI) parabens dissolved in phenoxyethanol, and ascorbyl palmitate (VII), was studied by using a cyano-propyl column ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Sottofattori E,Anzaldi M,Balbi A,Tonello G

更新日期：1998-10-01 00:00:00

abstract：:Derivatization of the free cys3,4 in human albumin, which is reported to occur under physiological conditions, has been performed in vitro by reaction of the protein with ethacrynic acid. This modification has been investigated by mass spectrometry and circular dichroism. Ethacrynic acid has been proven to bind human ...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Bertucci C,Nanni B,Raffaelli A,Salvadori P

更新日期：1998-10-01 00:00:00

abstract：:The principles of multivariate calibration (MC) are presented, with reference to the main objectives of this chellometrics technique: the reduction of the variance in the prediction of a response variable (generally, a chemical quantity) and the possibility of the determination of the response in complex matrices with...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Forina M,Casolino MC,de la Pezuela Martinez C

更新日期：1998-10-01 00:00:00

abstract：:A simple and sensitive high-performance liquid chromatographic method for the analysis of acetazolamide (AZ) in rat blood (plasma/serum, whole blood and serum ultrafiltrate), brain tissue and cerebrospinal fluid (CSF) was described. Quantitative extraction of AZ with ethyl acetate from both buffered plasma and brain t...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Ichikawa N,Naora K,Hirano H,Iwamoto K

更新日期：1998-09-01 00:00:00

abstract：:Stable isotope analogues of phenytoin are useful for pulse dose pharmacokinetic studies in epilepsy patients. A simultaneous assay was developed to quantitate phenytoin (5,5-diphenylhydantoin) and its stable isotope analogue [13C3]-phenytoin (5,5-diphenyl-2,4,5-13C3-hydantoin) from plasma. Quantitation was achieved by...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Nelson MH,Birnbaum AK,Nyhus PJ,Remmel RP

更新日期：1998-09-01 00:00:00

abstract：:The application of strong cation exchange (SCX) HPLC to the analysis of drugs in plasma, tissue and rodent feed is presented. This approach is shown to give useful separations allowing the separation of physiochemically diverse compounds in a simple isocratic system. The SCX columns are not as robust as standard rever...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Law B,Appleby JR

更新日期：1998-09-01 00:00:00

abstract：:Biosensors containing cytochrome P450cam in a didodecyldimethylammonium bromide vesicular system were prepared by cross-linking onto a glassy carbon electrode (GCE) with glutaraldehyde in the presence of bovine serum albumin. Cyclic voltammetric responses of the sensor in air-free buffer solution showed that the senso...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Iwuoha EI,Joseph S,Zhang Z,Smyth MR,Fuhr U,Ortiz de Montellano PR

更新日期：1998-09-01 00:00:00

abstract：:The star plot (SP) is a method of displaying multivariate data. It can be used to display data with more than two variables. Combined with principal component analysis (PCA), more than two PCs can be displayed in one plane. Different variants of this method are applied to an atomic absorption spectrometry (AAS) data s...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Wu W,Guo Q,de Aguiar PF,Massart DL

更新日期：1998-09-01 00:00:00

abstract：:An automated solid-phase extraction workstation was used to develop, characterize and validate two separate HPLC methods for quantifying drugs in plasma. Method development was facilitated by workstation functions which allowed wash solvents of varying organic composition to be mixed and tested automatically. The prec...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Parker TD 3rd,Surendran N,Stewart BH,Rossi DT

更新日期：1998-08-01 00:00:00

abstract：:In a multicentre study involving six laboratories, a microbiological assay was performed on three neomycin samples containing respectively, 0.12, 2.1 and 11% (m/m) of neomycin C, as well on a pure neomycin C sample. The potency was determined according to the European Pharmacopoeia method but using a neomycin B base s...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Adams E,Liu L,Dierick K,Guyomard S,Nabet P,Rico S,Louis P,Roets E,Hoogmartens J

更新日期：1998-08-01 00:00:00

abstract：:Losartan potassium is an angiotensin II receptor blocker. It has been formulated and marketed as a tablet dosage from (COZAAR). A reversed-phase high-performance thin-layer chromatography method has been validated and shown to be sensitive, efficient, and reliable, and can be used as an excellent alternative to the HP...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： McCarthy KE,Wang Q,Tsai EW,Gilbert RE,Ip DP,Brooks MA

更新日期：1998-08-01 00:00:00

abstract：:The urinary excretion of 2-hydroxyphenylacetic acid (2HPAA) was studied in human volunteers after oral and parenteral doses of coumarin. The presence of 2HPAA in the urine was confirmed by gas chromatography mass spectroscopy (GC MS). Mass spectra of reference material and samples are presented. The determination of 2...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Meineke I,Desel H,Kahl R,Kahl GF,Gundert-Remy U

更新日期：1998-07-01 00:00:00

abstract：:A liquid chromatographic tandem mass spectrometric method for the quantitative determination of sumatriptan base in human plasma and urine has been developed and validated over the concentration range 0.2-20 ng base ml-1. Sumatriptan is a 5-HT1 receptor agonist which has found widespread use in the treatment of migrai...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Cheng KN,Redrup MJ,Barrow A,Williams PN

更新日期：1998-07-01 00:00:00

abstract：:Direct current and differential pulse polarography DPP were used for the determination of three penicillins, namely, ampicillin, benzylpenicillin and carbenicillin, in pure form and in their dosage forms. The method is based upon treatment of penicillins with nitrous acid followed by polarographic measurement of the p...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Belal F,Rizk MS,Eid M

更新日期：1998-06-01 00:00:00

abstract：:A sensitive and stereospecific high-performance liquid chromatography (HPLC) method for the quantitation of ketoprofen enantiomers in human serum was developed. The assay involves the use of an octadecylsilane solid-phase extraction for serum sample clean-up prior to HPLC analysis. Chromatographic resolution of the ke...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Ameyibor E,Stewart JT

更新日期：1998-05-01 00:00:00

abstract：:A combined method of immunoaffinity extraction with high-performance liquid chromatography has been developed for the enantioselective determination of bufuralol and its metabolites in human plasma. The antibodies having high affinity toward the asymmetric center at the C-1 position of bufuralol and its 1'-oxidized me...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Ikegawa S,Matsuura K,Sato T,Isriyanthi NM,Niwa T,Miyairi S,Takashina H,Kawashima Y,Goto J

更新日期：1998-05-01 00:00:00

abstract：:Eprinomectin is a potent anthelmintic compound that kills certain parasitic nematodes and arthropods of cattle. A sensitive and automated bioanalytical assay was developed for quantitation of eprinomectin in bovine plasma in support of clinical development of eprinomectin for use in all classes of cattle. This assay d...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Antonian L,DeMontigny P,Wislocki PG

更新日期：1998-04-01 00:00:00

abstract：:A simple analytical method for l-menthol by high-performance liquid chromatography with a polarized photometric detector was established. The polarized photometric detector was constructed with two polarizers mounted on both sides of the flow cell in a conventional photometric detector and can be easily used for the d...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Hamasaki K,Kato K,Watanabe T,Yoshimura Y,Nakazawa H,Yamamoto A,Matsunaga A

更新日期：1998-04-01 00:00:00

abstract：:Two cellulose-based chiral stationary phases (Chiralcel OD and Chiralcel OJ) were compared on their ability to resolve various aliphatic ibuprofen esters. Chiralcel OJ with hexane as the mobile phase allows for the separation of most of the esters. Observed changes in resolution depending on the solute nature (basicit...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Ducret A,Trani M,Pepin P,Loriet R

更新日期：1998-03-01 00:00:00

abstract：:Assessment of analytical variability is recognized as an important factor for the establishment of specifications. Estimation of the variance for an analytical procedure can be accomplished using a variety of approaches. The approach of variance component analysis was applied retrospectively, as well as prospectively,...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Tsang PK,Larew JS,Larew LA,Miyakawa TW,Hofer JD

更新日期：1998-03-01 00:00:00

abstract：:In this study, a high pressure liquid chromatography method with fluorescent detector was developed to analyze blood galactose, lactose and glucose simultaneously. Plasma sugars were prepared as fluorescent derivatives to react with FMOC-hydrazine (9-fluorenyl methyl chloroformate). A C18 reversed phase column and a f...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Yuh YS,Chen JL,Chiang CH

更新日期：1998-02-01 00:00:00

abstract：:A high-performance liquid chromatography tandem mass spectrometry-mass spectrometry (LC-MS-MS) assay was developed for the analyses of morphine, morphine glucuronides and normorphine in plasma samples from rats. The analytes were extracted by using C2 solid-phase extraction cartridges. The extraction recoveries were 1...

journal_title：Journal of pharmaceutical and biomedical analysis

authors： Zheng M,McErlane KM,Ong MC

更新日期：1998-02-01 00:00:00