scholarly journals Determination of Albendazole and Its Metabolites in the Muscle Tissue of Hybrid Striped and Largemouth Bass Using Liquid Chromatography with Fluorescence Detection

2008 ◽  
Vol 91 (2) ◽  
pp. 469-478 ◽  
Author(s):  
Nathan Rummel ◽  
Badar Shaikh
Keyword(s):  
Muscle Tissue ◽  
Fish Species ◽  
Mobile Phase ◽  
Reversed Phase ◽  
Tissue Samples ◽  
Albendazole Sulfoxide ◽  
Liquid Chromatographic Method ◽  
Albendazole Sulfone ◽  
Liquid Chromatographic

Abstract A liquid chromatographic method was developed for the determination of albendazole and its metabolites albendazole sulfoxide, albendazole sulfone, and albendazole-2-aminosulfone from largemouth and hybrid striped bass muscle tissue with adhering skin. The muscle tissue samples were made alkaline with potassium carbonate and extracted with ethyl acetate. The extracts were further subjected to cleanup by using a series of liquidliquid extractions. After solvent evaporation, the residue was reconstituted in mobile phase and chromatographed. The chromatography was carried out on a reversed-phase Luna C18 column, using acetonitrilemethanol buffer as the mobile phase. The analytes were detected by fluorescence with excitation and emission wavelengths of 290 and 330 nm, respectively. The average recoveries from the fortified muscle tissue of the 2 fish species for albendazole (25100 ppb), albendazole sulfoxide (8.7552.5 ppb), albendazole sulfone (110 ppb), and albendazole-2-aminosulfone (10100 ppb) were 89, 82, 99, and 74, respectively. The coefficient of variation for each compound was 20 in all cases. The procedure was applied to the determination of albendazole and its 3 metabolites in the muscle tissue of the 2 fish species after orally dosing them with albendazole.

Determination of Cymiazole Residues in Honey by Liquid Chromatography

1993 ◽  
Vol 76 (1) ◽  
pp. 92-94 ◽  
Author(s):  
Paolo Cabras ◽  
Marinella Melis ◽  
Lorenzo Spanedda
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Analysis ◽  
Mobile Phase ◽  
Chromatographic Method ◽  
Reversed Phase ◽  
Limit Of Determination ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Control Samples

Abstract A liquid chromatographic method is described for the determination of cymiazole residues in honey. This acaricide is determined on a reversed-phase (C18) column, with a CH3CN-O.OOIN HCI-NaCI mixture (950 mL + 50 mL + 0.3 g/L) as the mobile phase, and UV detection at 265 nm. Cymiazole is extracted with n-hexane from aqueous alkalinized (pH 9) honey solutions. No further cleanup of the honey extract was required before chromatographic analysis. Recoveries on control samples fortified with 0.01,0.10, and 1.00 ppm cymiazole ranged from 92 to 102%. The limit of determination was 0.01 ppm.

scholarly journals Improved Liquid Chromatographic Method for Determination of Organic Acids in Leaves, Pulp, Fruits, and Rinds of Garcinia

2003 ◽  
Vol 86 (5) ◽  
pp. 1063-1068 ◽  
Author(s):  
Guddadarangavvanahally K Jayaprakasha ◽  
Bhabani S Jena ◽  
Kunnumpurath K Sakariah
Keyword(s):  
Organic Acids ◽  
Mobile Phase ◽  
Reversed Phase ◽  
Direct Application ◽  
Improved Method ◽  
Hydroxycitric Acid ◽  
Liquid Chromatographic Method ◽  
Acid Lactone ◽  
Liquid Chromatographic

Abstract An improved liquid chromatographic (LC) method was developed for determination of organic acids in leaves, pulp, fruits, and rinds of Garcinia. At present, the commonly used LC method for analysis of organic acids in Garcinia extracts uses direct application of the extracts on the column. This practice gradually reduces efficiency of the column and shortens its life. In the improved method, the interfering substances such as pigments and xanthones were effectively removed by passing the aqueous extract through an ODS cartridge. With subsequent injection on a C18 reversed-phase column, using 6.0mM phosphoric acid as the mobile phase with a flow rate of 1.0 mL/min and UV detection at 210 nm, the organic acids were determined in the extracts. The major organic acid was (–)-hydroxycitric acid at the level of 2.5, 0.8, 3.0, and 20.1% in leaf, pulp, fresh fruit, and dried rinds, respectively. Minor quantities of hydroxycitric acid lactone, oxalic acid, and citric acid were also identified. Limits of detection and recoveries were 0.9–1.5 μg and 93.9–99.8%, respectively. This is the first report on the composition of organic acids from Garcinia pedunculata.

scholarly journals DEVELOPMENT AND VALIDATION OF A HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD DETERMINATION OF ZIDOVUDINE ENCAPSULATED IN PCL NANOPARTICLES

2017 ◽  
Vol 1 (2) ◽  
pp. 1-8
Author(s):  
Milena Cristina Ribeiro Souza Magalhães ◽  
Alisson Samuel Portes Caldeira ◽  
Hanna De Sousa Rocha Almeida ◽  
Sílvia Ligório Fialho ◽  
Armando Da Silva Cunha Junior
Keyword(s):  
Mobile Phase ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Reversed Phase ◽  
Hplc Method ◽  
Liquid Chromatographic Method ◽  
Development And Validation ◽  
Liquid Chromatographic ◽  
Isocratic Mode

A reversed-phase high-performance liquid chromatographic (HPLC) method was developed and validated for the determination of encapsulation efficiency of zidovudine in nanoparticules. The method was carried out in isocratic mode using 0.040M sodium acetate: methanol: acetonitrile: glacial acetic acid (880:100:20:2) as mobile phase, a C8 column at 25ºC and UV detection at 240 nm. The method was linear (r2 ˃ 0.99) over the range of 25.0-150.0 μg/mL, precise (RSD ˂ 5%), accurate (recovery = 100.5%), robust and selective. The validated HPLC-UV method can be successfully applied to determine the rate of zidovudine in nanoparticules.

Liquid-chromatographic determination of pentobarbital in plasma with use of a resin column and an alkaline mobile phase.

1982 ◽  
Vol 28 (8) ◽  
pp. 1772-1774 ◽  
Author(s):  
R N Gupta ◽  
P T Smith ◽  
F Eng
Keyword(s):  
Mobile Phase ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Reversed Phase ◽  
Enhanced Sensitivity ◽  
Acidic Drugs ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract We describe a liquid-chromatographic method involving a new, nonsilica column (XAD-2, Hamilton Co.) for pentobarbital in plasma. Plasma is extracted with chloroform after addition of the internal standard, 5-ethyl-5-p-tolyl-barbituric acid. Acidic drugs are back-extracted into alkali, then chromatographed on the resin-base reversed-phase column. The use of alkaline mobile phase allows enhanced sensitivity and detection of barbiturates at 240 nm. The within-run CV for 10 samples was 1.9%, the between-run CV 1.8%. Ten commonly used barbiturates are separated isocratically in less than 15 min. Other commonly prescribed acidic drugs do not interfere with determination of pentobarbital.

scholarly journals Simultaneous Determination of E- and Z-Guggulsterones in Dietary Supplements Containing Commiphora mukul Extract (Guggulipid) by Liquid Chromatography

2001 ◽  
Vol 84 (1) ◽  
pp. 24-28 ◽  
Author(s):  
Mythili Nagarajan ◽  
Ted W Waszkuc ◽  
Jidong Sun
Keyword(s):  
Simultaneous Determination ◽  
Mobile Phase ◽  
Reversed Phase ◽  
Liquid Chromatographic Method ◽  
Commiphora Mukul ◽  
Hypolipidemic Agent ◽  
Synthetic Standard ◽  
Cis And Trans ◽  
Liquid Chromatographic

Abstract Guggulipid, the standardized product from the extraction of the ole-gum-resin from the Commiphora mukul plant, has been marketed as a hypolipidemic agent. The ketosteroids, cis- and trans-4,17(20)-pregnadiene-3,16-dione, known as E- and Z-guggulsterones, respectively, are the main ingredients in guggulipid. A liquid chromatographic method was developed for simultaneous determination of E- and Z-guggulsterones in guggulipid preparations using synthetic E- and Z-guggulsterone standards. Realtively low amounts of guggulsterones (E and Z) were found in commercial guggulipid preparations in comparison with the manufacturer's claim of 2.5%. The mixture of E- and Z-guggulsterones was extracted and separated on a Symmetry C18 reversed-phase column, with a mobile phase of acetonitrile–water (46 + 54, v/v) and detected at 242 nm. The retention times of E- and Z-guggulsterones are approximately 8 and 11 min, respectively. Assay quantitation was based on the calibration curve obtained from a mixture of synthetic standard E- and Z-guggulsterones. Experimental data on selectivity, linearity, accuracy, and recoveries are presented.

scholarly journals Liquid Chromatographic Determination of Scopolamine, Hyoscyamine, and Phenobarbital in Tablets

1997 ◽  
Vol 80 (2) ◽  
pp. 331-334 ◽  
Author(s):  
Susan Ting
Keyword(s):  
Mobile Phase ◽  
Chromatographic Determination ◽  
Reversed Phase ◽  
Scopolamine Hydrobromide ◽  
Acid Sodium Salt ◽  
Liquid Chromatographic Method ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic method using a reversed- phase C18 column and octanesulfonic acid sodium salt-methanol as the mobile phase was developed for the simultaneous determination of phenobarbi- tal, scopolamine, and hyoscyamine in tablets. The mixture of the 3 drugs was resolved in <8 min. Detector responses were linear for 10 μL injections of the following: scopolamine hydrobromide, 8.25-206.3 μg/mL; hyoscyamine sulfate, 15.01-750.76 μg/mL; and phenobarbital, 250-751 μg/mL. Recoveries from tablets were 100.8% for scopolamine hydrobromide, 100.1% for hyoscyamine sulfate, and 100.3% for phenobarbital. Replicate injections of scopolamine hydrobromide, hyoscyamine sulfate, and phenobarbital gave an overall relative standard deviation of <1.0% (n = 10). The method detected as little as 3.3 ng scopolamine hydrobromide.

scholarly journals Determination of Pantoprazole Sodium and Lansoprazole in Individual Tablet Dosage Forms by RP-HPLC Using Single Mobile Phase

2009 ◽  
Vol 6 (2) ◽  
pp. 489-494 ◽  
Author(s):  
B. Prasanna Kumar Reddy ◽  
Y. Ramanjaneya Reddy ◽  
D. Ramachandran
Keyword(s):  
Mobile Phase ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Reversed Phase ◽  
Pharmaceutical Products ◽  
Liquid Chromatographic Method ◽  
Phase Liquid ◽  
Tablet Dosage ◽  
Liquid Chromatographic

A simple, sensitive and precise high performance liquid chromatographic method for the analysis of pantoprazole sodium and lansoprazole has been developed, validated and used for the determination of compounds in commercial pharmaceutical products. The compounds were well separated an isocratically on a C18column [Inertsil C18, 5μ, 150 mm x 4.6 mm] utilizing a mobile phase consisting of acetonitrile: phosphate buffer (60:40, v/v, pH 7.0) at a flow rate of 1.0 mL/min with UV detection at 230 nm. The retention time of pantoprazole sodium and lansoprazole was found to be 2.017 min and 2.538. The procedure was validated for linearity (Correlation coefficient=0.999). The study showed that reversed-phase liquid chromatography is sensitive and selective for the determination of pantoprazole sodium and lansoprazole using single mobile phase.

scholarly journals Development and Validation of Liquid Chromatographic Method for Estimation of Ibuprofen and Famotidine in Combined Dosage Form

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Dimal A. Shah ◽  
Dixita J. Suthar ◽  
Sunil L. Baldania ◽  
Usman K. Chhalotiya ◽  
Kashyap K. Bhatt
Keyword(s):  
Mobile Phase ◽  
Dosage Form ◽  
Chromatographic Method ◽  
Reversed Phase ◽  
Assay Method ◽  
Liquid Chromatographic Method ◽  
Phase Liquid ◽  
Development And Validation ◽  
Liquid Chromatographic

An isocratic, reversed phase-liquid-chromatographic assay method was developed for the quantitative determination of ibuprofen and famotidine in combined-dosage form. A Brownlee C18, 5 μm column with mobile phase containing water : methanol : acetonitrile (30 : 60 : 10, v/v/v) was used. The flow rate was 1.0 mL/min, and effluents were monitored at 264 nm. The retention times of ibuprofen and famotidine were 4.9 min and 6.8 min, respectively. The linearity for ibuprofen and famotidine was in the range of 2–20 μg/mL and 0.1–10 μg/mL, respectively. The proposed method was validated with respect to linearity, accuracy, precision, specificity, and robustness. The method was successfully applied to the estimation of ibuprofen and famotidine in combined dosage form.

A Green Liquid Chromatographic Method For The Simultaneous Determination of Chlorpheniramine Maleate, Pseudoephedrine Hydrochloride and Propyphenazone

2019 ◽  
Vol 15 (6) ◽  
pp. 635-641
Author(s):  
Nadia M. Mostafa ◽  
Ghada M. Elsayed ◽  
Nagiba Y. Hassan ◽  
Dina A. El Mously
Keyword(s):  
Simultaneous Determination ◽  
Mobile Phase ◽  
Dosage Form ◽  
Chromatographic Method ◽  
Green Analytical Chemistry ◽  
Chlorpheniramine Maleate ◽  
Accuracy And Precision ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Background:The concept of green analytical chemistry prevails due to the growing environmental pollution.Objective:Our attempts are to develop simple and eco-friendly method which is non-harmful to the environment by producing minimal waste. In this context, a green liquid chromatographic method was applied for the simultaneous determination of chlorpheniramine maleate, pseudoephedrine hydrochloride and propyphenazone in their combined dosage form.Methods:Separation was carried out using X select HSS RP C18 analytical column (250 × 4.6 mm, 5μm) using methanol - 0.02 M phosphate buffer pH 3 - triethylamine (60:40: 0.1, by volume) as a mobile phase. The separated peaks were detected at 215 nm at a flow rate 1.0 mL/min.Results:Quantification was done over the concentration ranges of 1-25 µg/mL for chlorpheniramine maleate, 5-35 µg/mL for pseudoephedrine hydrochloride and 10-120 µg/mL for propyphenazone. The suggested method was validated with regard to linearity, accuracy and precision according to the International Conference on Harmonization guidelines with good results.Conclusion:It could be used as a safer alternative for routine analysis of the mentioned drugs in quality control laboratories.

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