Articles Related to Liquid Chromatography
Reversed-Phase High Performance Liquid Chromatography Procedure for the Determination of Isavuconazole in Human Plasma
Introduction: Isavuconazole is an antifungal drug used for treating patients with invasive fungal infections. Efficacy and safety of isavuconazole is monitored by measuring plasma isavuconazole concentration using LCMS which is a non-affordable method. We used the HPLC system with a UV detector to measure plasma Isavuconazole concentration.
Objective: Improved Reversed-phase high performance liquid chromatography procedure with UV detection is described which is cost effective, simple, precise and easily processed for the measurement of Isavuconazole, a drug used to treat the patients with invasive fungal infections, in blood plasma. Method: The method involves protein precipitation, addition of ammonium dihydrogen phosphate and chromatographic separation on a Hypurity C18 Column using an isocratic mobile phase of acetonitrile and ammonium acetate buffer (pH 8.0, 10 mM) (55:45, v/v). The UV detection was performed at 285 nm. The method provides rapid resolution of Isavuconazole in a 50 uL injection.
Result: Lower limit of Quantification (LLOQ) is 0.25 μg/ml in a 50 uL injection volume for Isavuconazole with a recovery consistently > 100 %. The assay is validated over linear range of 0.25 to 10 μg/ml. The intra-assay precision is < 3.53 % and inter-assay is <6.38% relative standard deviation of Isavuconazole. The method demonstrated clean separation, clinically acceptable detection limit and a linear range upto 25 ug/mL.
Conclusion: The assay demonstrated applicability in quantifying the drug level and monitoring the therapeutic dose for maintaining effective biological level to have better response in fungal infected patients. The method is cheaper as compared to LC-MS/MS and Tandem Mass spectrometry and the results are reportable on the same day of blood collection.
Estimation of Beta-Lactam Antibiotics-Serum Albumin Conjugated Proteins by High Performance Liquid Chromatography with Ultraviolet Detector
β-lactam antibiotics represented the oldest class of antibiotics used in the treatment of infections in a human being, livestock, and aquaculture. Drugs residues in the edible tissues or foodstuffs of animal pose a potential threat to human health. At present, extensive antibiotic-resistant strains are now being detected and the development of antibiotic-resistant strains of epidemic and zoonotic pathogens is a major concern. Therefore, the purpose of this study was to estimate the extent of β-lactam antibiotics-HSA/BSA conjugations via three conjugation methods by using high-performance liquid chromatography (HPLC) with ultraviolet (UV) detector. We wish that the technique will be applied to preliminarily detect the residues of β-lactam antibiotics may persist in edible tissues or foodstuffs in the livestock and aquaculture farms in clinical.
Novel analytical technologies of Quality in the Sheep & Goat Dairy Sector
France, Greece, Italy, and Spain the major sheep and goat milk producers in Europe, got the initiative through an interim of 30 years (1985 – 2015), to organize - through IDF - 7 symposiums aiming at the upgrade of the Dairy Sector. One major interest was the milk quality. Stepwise, the efforts followed cow milk structural development in organizing the testing laboratory, the definition of quality in composition (fat, protein, lactose, total solids), in Hygienic (Total Bacteria Count, Somatic Cell Count, antibiotics residues and Aflatoxin M1 contamination), adulteration with water and detection of milk species. EU, by Decision 2002/657/EC, defined the rules for the Directive 96/23/EC, enumerated the testing methods, the demands in sampling procedures, the minimum limits of performance, the quality control (ISO 17025) and the interpretation of results. The equivalency of results from different laboratories, through ISO 17025, demanded the application of ISO analytical standards.
Bioanalytical Method Development and Validation of Ferrum in Rabbit Plasma Samples by Derivatised Reverse Phase Liquid Chromatography and Application to Pharmacokinetic Study
Iron is an important component of hemoglobin, in addition to other positive roles like proper growth and development of humans and for growing of fetus in pregnancy women. Iron deficiency anemia is more prevalent among vegetarian than non vegetarians.
The Impact of Repeated Hb A2 Measurements on β-Thalassemia Trait Diagnosis
Hemoglobin A2 (Hb A2) is a minor component of the hemoglobin present in normal adult red blood cells, accounting for 1.5-3.5% of the total hemoglobin in healthy individuals.
A One-Year Hospital Based Prospective Study of Sickle Cell Disease from One Capital Area of Kuwait by HPLC
Haemoglobinopathies are inherited disorders of haemoglobin synthesis that are responsible for significant morbidity and mortality all over the world.
Relative Bioavailability of Ciprofloxacin Doses (750 and 1000) mg in Healthy Male Volunteers by Using HPLC Method
A new, stable and accurate high performance liquid chromatography ultraviolet spectrophotometric method for quantitation of Ciprofloxacin in human plasma was developed and validated.
Reduction of Bitterness and Enhancing Palatability of Cetirizine Oral Liquid Dosage Forms by Cyclodextrins
The aim of this manuscript is to study cyclodextrins (CDs) as a potential excipient to suppress bitterness and enhance palatability of pediatric liquid preparations for Cetirizine, an extremely bitter drug. Natural α, β and γ CDs; and β CD derivatives such as hydroxyl propyl (HP), randomly methylated (RM) and sulfobutyl ether (SBE) β-CDs were screened in different molar ratios of 1:1, 1:2 and 1:3 for their inhibition of the extremely bitter taste of Cetirizine using the human gustatory sensation test.
Identification of Designer Drugs using Gas Chromatography High-Resolution Mass Spectrometry and a Soft-Ionization Source
Gas chromatography-mass spectrometry (GC-MS) with electron ionization (EI) or chemical ionization (in positive or negative mode) plays an important role in the forensic analysis of designer drugs.
Topical Delivery System for Phytochemicals: Capsaicin and Capsicum Tincture
Capsaicin, an active ingredient of Capsicum fruit, is currently undergoing “revival” in the clinical management of pain. However, the choice of its formulation is rather limited to the use of “old-fashioned” tinctures and recently the patches. In an attempt to improve the therapeutic outcome and develop its skin-friendly formulation, we prepared the vesicle-based drug delivery system with capsaicin.
Toxicological Screening and Quantitation Using Liquid Chromatography/Time-of-Flight Mass Spectrometry
In recent years, an increasing number of new designer-drugs have increased the demands for general toxicological screening [1]. Limited screening based on immunoassays is commonly used in clinical toxicology, whereas more comprehensive approaches are common in forensic toxicology such as screening based on Gas or Liquid Chromatography (GC or LC) approaches.
Quantitative Analysis of 30 Drugs in Whole Blood by SPE and UHPLC-TOFMS
An Ultra-High Pressure Liquid Chromatography Time-of-Flight Mass Spectrometry (UHPLC-TOF-MS) method for quantitative analysis of 30 drugs in whole blood was developed and validated. The method was used for screening and quantification of common drugs and drugs of abuse in whole blood received from autopsy cases and living persons.
Development of a Stability Indicating UPLC-MS/MS Method for Rapid and Reliable Determination of Fenofibrate in Marketed Product (Lypanthyl® 200M) and Human Plasma
A reliable, fast, sensitive and selective Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS) method has been developed and validated for the determination of fenofibrate in marketed product (Lipanthyl) and human plasma. The chromatographic separation was performed on a reversed-phase Acquity®BEH C18 column (1.7 μm particle size, 50 mm x 2.1 mm ID) with an isocratic elution profile and mobile phase consisting of methanol and water (80:20, %, v/v). To achieve optimum chromatographic condition the influence of mobile phase composition and flow rate was investigated. The total chromatographic analysis time was as short as 2 min.
