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Monolithic matrix type transdermal drug delivery systems of pinacidil monohydrate: in vitro characterisation.

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The monolithic matrix type transdermal drug delivery systems of pinacidil monohydrate (PM) were prepared by film casting technique on mercury substrate and characterised in vitro by drug release studies using paddle over disc assembly, skin permeation studies using Keshary and Chein diffusion cell

A new desorption method for removing organic solvents from activated carbon using surfactant.

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OBJECTIVE A new desorption method was investigated, which does not require toxic organic solvents. Efficient desorption of organic solvents from activated carbon was achieved with an ananionic surfactant solution, focusing on its washing and emulsion action. METHODS Isopropyl alcohol (IPA) and

Sustained release microspheres of diclofenac sodium using PEGylated rosin derivatives.

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The PEGylated derivatives of rosin-PD-1 and PD-2 synthesized and characterized earlier (Nande et al., 2006) were investigated as potential materials for sustained release microsphere prepared by emulsion solvent evaporation method using diclofenac sodium (DCS) as model drug. All the microspheres

Optimization studies on gastroretentive floating system using response surface methodology.

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The aim of the present investigation was to develop and optimize gastroretentive floating system of amoxicillin for the efficient treatment of peptic ulcer induced by Helicobacter pylori infection. Floating microballoons were developed using central composite design (CCD), and optimization was done

Determination of 7-aminoflunitrazepam in urine by dispersive liquid-liquid microextraction with liquid chromatography-electrospray-tandem mass spectrometry.

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Dispersive liquid-liquid microextraction (DLLME) and liquid chromatography-electrospray-tandem mass spectrometry (LC-ES-MS/MS) procedure was presented for the extraction and determination of 7-aminoflunitrazepam (7-aminoFM2), a biomarker of the hypnotic flunitrazepam (FM2) in urine sample. The

[Determination of nicacid and its metabolites in human plasma by HPLC-MS/MS].

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OBJECTIVE To develop a sensitive HPLC-MS/MS method for the determination of nicacid and its metabolites in human plasma. METHODS The assay was conducted with an API 3000 LC-MS/MS system comprising of a Genimi C18 column (50 x 3.00 mm, 3 microm), and an eluate of 0.1% acetic acid-methanol-isopropyl

Measurement by HPLC of midazolam and its major metabolite, 1-hydroxymidazolam in plasma of very premature neonates.

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A simple, selective high-performance liquid chromatographic method with ultraviolet detection at 220 nm is described for quantitation of midazolam and its primary metabolite 1-hydroxymidazolam in 100 microL plasma samples from premature infants. A mobile phase of

Determination of acyclovir in human serum by high-performance liquid chromatography using liquid-liquid extraction and its application in pharmacokinetic studies.

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A fast, simple and sensitive high performance liquid chromatographic (HPLC) method has been described for determination of acyclovir in human serum. Since acyclovir is a polar compound and soluble in aqueous medium and practically insoluble in most of organic solvents, its analysis in biological

Matrix type transdermal drug delivery systems of metoprolol tartrate: in vitro characterization.

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The monolithic matrix type transdermal drug delivery system of metoprolol tartrate were prepared by the film casting on a mercury substrate and characterised in vitro by drug release studies, skin permeation studies and drug-excipients interaction analysis. Four formulations were developed, which

Simultaneous determination of diclofenac potassium and drotaverine hydrochloride in human plasma using reversed-phase high-performance liquid chromatography.

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A simple high-performance liquid chromatographic method with ultraviolet detection is proposed for the estimation of diclofenac potassium and drotaverine hydrochloride in human plasma. Liquid-liquid extraction was carried out with a mixture of dichloromethane-isopropyl alcohol (80:20, v/v).

Solvent engineering based on triethylenetetramine (TETA) for perovskite solar cells processed in ambient-air.

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Solvent engineering as a crucial factor in determining the photovoltaic performance of perovskite solar cells has attracted much attention in recent years. Herein, we treat PbI2 and perovskite films with isopropyl alcohol, acetone, diethyl ether and dichloromethane, as standard solvents, in a

A method for detecting breakthrough of organic solvent vapors in a charcoal tube using semiconductor gas sensors.

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This study developed a method for detecting organic vapors that break through charcoal tubes, using semiconductor gas sensors as a breakthrough detector of vapors. A glass column equipped with two sensors was inserted in Teflon tubing, and air containing organic vapor was introduced at a constant

A simple method for the determination of ethylene-thiourea (ETU) in biological samples.

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A direct, simple, and rapid high-performance liquid chromatographic method has been developed for the determination of ethylene-thiourea (ETU) in biological fluids. Samples were chromatographed on a Lichrosorb RP8 (5 pm) column after extraction with dichloromethane. The mobile phase was a mixture of

Determination of the antiplatelet agent. KB-3022, and its metabolite by high-performance liquid chromatography.

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A rapid, accurate and reproducible high-performance liquid chromatographic method for the simultaneous determination of a new antiplatelet agent, ethyl 2-[4,5-bis(4-methoxyphenyl)thiazol-2-yl]pyrrol-1-ylacetate (KB-3022), and its main metabolite,

Formulation and evaluation of controlled-release matrix systems of ciprofloxacin.

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BACKGROUND Ciprofloxacin is a broad-spectrum fluoroquinolone antibacterial drug to which most Gram-negative and many Gram-positive bacteria are highly susceptible. Fluoroquinolones are administered repeatedly, twice a day for 5 days, during the course of therapy. Hence, they require repeated

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