scholarly journals Development And Validation of An Eco-Friendly and High-Throughput HPLC Method To Quantify Pyrethroid and Pyriproxyfen in Long-Lasting Insecticide-Treated Nets

2021 ◽  
Author(s):  
Kyle J. Walker ◽  
Christopher T. Williams ◽  
Folasade O. Oladepo ◽  
John Richard Lucas ◽  
David Malone ◽  
...  
Keyword(s):  
High Throughput ◽  
Internal Standard ◽  
Hplc Method ◽  
Insecticide Treated Nets ◽  
High Throughput Method ◽  
Before And After ◽  
Specialized Equipment ◽  
Extraction Volume ◽  
Development And Validation ◽  
Labour Time

Abstract Long-lasting insecticide-treated nets (LLINs) are essential to preventing malaria transmission. The LLINs should last for at least three years, even after repeated washings. Currently, tracking insecticides in LLINs is cumbersome, costly, and requires specialized equipment and hazardous solvents. We therefore developed a low-resource, high-throughput method for detecting insecticides in LLINs. In order to extract insecticides from polyethylene, LLIN samples were heated for 45 minutes at 85oC in 1-propanol-heptane containing dicyclohexylphthalate as an internal standard. Sample size was reduced to ~0.2 g for reduced extraction volume, which is 10% less than what was recommended. We optimized HPLC chromatographic conditions to assess pyrethroid and pyriproxyfen content in polyethylene-based LLINs. The method is capable of quantifying levels ≥ 0.0015% permethrin, 0.00045% alpha-cypermethrin and 0.00025% pyriproxyfen (w/w) in polyethylene, allowing tracking the insecticides before and after LLINs use. A variety of LLINs can be evaluated with this method, including those with 1% pyriproxyfen (pyriproxyfen-LLIN) or 2% permethrin (Olyset® Net), 1% pyriproxyfen and 2% permethrin (Olyset® Duo), or 0.55% pyriproxyfen combined with 0.55% alpha-cypermethrin (Royal Gaurd®). Analysis of 120 samples (40 nets) per run can be done with high precision and accuracy, reducing labour time and costs whilst reducing the environmental impact of organic solvents.

scholarly journals RP-HPLC method development and validation for estimation of rivaroxaban in pharmaceutical dosage forms

2013 ◽  
Vol 49 (2) ◽  
pp. 359-366 ◽  
Author(s):  
Mustafa Çelebier ◽  
Tuba Reçber ◽  
Engin Koçak ◽  
Sacide Altinöz
Keyword(s):  
Method Development ◽  
Internal Standard ◽  
Hplc Method ◽  
Pharmaceutical Dosage Forms ◽  
Rp Hplc ◽  
Ich Guidelines ◽  
Method Development And Validation ◽  
Hplc Method Development ◽  
Development And Validation ◽  
Tablet Dosage

Rivaroxaban, an anti-clotting medication, acts at a crucial point in the blood-clotting process and stops the formation of blood clots. In this study, RP-HPLC method was developed for the determination of rivaroxaban in tablets (Xarelto® (10 mg)). Phenomenex Luna 5 µm C18 100 Å LC Column (250 x 4.6 mm) was used at 40 ºC. Isocratic elution was performed with ACN:Water (55:45 v/v) mixture. The flow rate was 1.2 mL min-1 and UV detection was at 249 nm. Internal standard (Caffeine) and rivaroxaban were eluted within 2.21 and 3.37 minutes, respectively. The developed method was validated according to the ICH guidelines and found to be linear within the range 0.005 - 40.0 µg mL-1. The method was accurate, precise, robust and rapid. Thus, it was applied successfully for the quality control assay of rivaroxaban in tablet dosage form.

scholarly journals Reversed-Phase HPLC Analysis of Levetiracetam in Tablets Using Monolithic and Conventional C18 Silica Columns

2010 ◽  
Vol 93 (4) ◽  
pp. 1077-1085 ◽  
Author(s):  
Nafiz O Can ◽  
Goksel Arli
Keyword(s):  
Monolithic Column ◽  
Stationary Phases ◽  
Internal Standard ◽  
Reversed Phase ◽  
Hplc Method ◽  
Array Detector ◽  
Pharmaceutical Tablets ◽  
System Suitability ◽  
Development And Validation

Abstract Development and validation of an RP-HPLC method for determination of levetiracetam in pharmaceutical tablets is described. The separation and quantification of levetiracetam and caffeine (internal standard) were performed using a single analytical procedure with two different types of stationary phases, conventional Phenomenex Gemini C18 (100 4.6 mm, 5 m) and Merck Chromolith Performance RP18e (100 4.6 mm, macropore size 2 mm, micropore size 13 nm) monolithic silica. Five-microliter aliquots of samples were injected into the system and eluted using wateracetonitrile (90 + 10, v/v) mobile phase pumped at the rate of 1 mL/min. The analyte peaks were detected at 200 nm using a diode array detector with adequate resolution. Validation studies were performed using the method recommended by the International Conference on Harmonization, the U.S. Pharmacopeia, and AOAC INTERNATIONAL, which includes accuracy, precision, range, limits, robustness, and system suitability parameters. Levetiracetam and caffeine were detected in about 7 min using the conventional column, whereas less than 5 min was required when the monolithic column was used. Calibration plots had r values close to unity in the range of 0.88.0 g/mL. Assay of levetiracetam in a tablet formulation was demonstrated as an application to real samples.

Validated HPLC Method for Quantification of a Novel Trk Inhibitor, Larotrectinib in Mice Plasma: Application to a Pharmacokinetic Study

Drug Research ◽  
2020 ◽  
Vol 70 (02/03) ◽  
pp. 101-106
Author(s):  
Harsha K. Tripathy ◽  
S.V. Nair Manju ◽  
Ashok Zakkula ◽  
Ram Murthi Bestha ◽  
Sreekanth Dittakavi ◽  
...  
Keyword(s):  
Pharmacokinetic Study ◽  
High Performance ◽  
Wave Length ◽  
Internal Standard ◽  
Hplc Method ◽  
Long Term Storage ◽  
Development And Validation ◽  
Orally Active ◽  
Regulatory Guideline

AbstractLarotrectinib, is an orally active novel small molecule approved for the treatment of solid tumors in pediatrics and adult patients. It acts by inhibiting tropomyosin receptor kinase. In this paper, we report the development and validation of a high-performance liquid chromatography (HPLC) method for the quantitation of larotrectinib in mice plasma as per the FDA regulatory guideline. Plasma samples processing was accomplished through simple protein precipitation using acetonitrile enriched with internal standard (IS, enasidenib). The chromatographic analysis was performed using a gradient mobile phase comprising 10 mM ammonium acetate and acetonitrile at a flow-rate of 0.8 mL/min on an X-Terra Phenyl column. The UV detection wave length was set at λmax 262 nm. Larotrectinib and the IS eluted at 3.85 and 6.60 min, respectively with a total run time of 8.0 min. The calibration curve was linear over a concentration range of 0.20–5.00 μg/mL (r2=≥0.992). The intra- and inter-day precision and accuracy results were within the acceptable limits. Results of stability studies indicated that larotrectinib was stable on bench-top, in auto-sampler, up to three freeze/thaw cycles and long-term storage at −80°C. The validated HPLC method was successfully applied to a pharmacokinetic study in mice.

scholarly journals Development and Validation of Stability Indicating RP-HPLC Method for the Determination of Metaxalone in Bulk and its Pharmaceutical Formulations

2011 ◽  
Vol 8 (s1) ◽  
pp. S439-S447 ◽  
Author(s):  
Prafulla Kumar Sahu ◽  
M. Mathrusri Annapurna ◽  
Sahoo Dillip Kumar
Keyword(s):  
Dynamic Range ◽  
Internal Standard ◽  
Pharmaceutical Formulations ◽  
Hplc Method ◽  
Pharmaceutical Dosage Form ◽  
Stability Indicating ◽  
Standard Curve ◽  
Oxidation Reduction ◽  
Development And Validation

A stability indicating reverse phase HPLC method was developed for the determination of metaxalone, a skeletal muscle relaxant, present in bulk and its pharmaceutical formulations using gliclazide as the internal standard (I.S). A hypersil ODS C18 column (250 × 4.6 mm, packed with 5 micron) in an isocratic mode with mobile phase Acetonitrile: phosphate buffer 3.6 (50:50%v/v) was used at a flow rate of 0.8 mL/ min and effluent was monitored at 225 nm. The assay exhibited a linear dynamic range of 0.6-100 µg/mL. Acceptable precision and accuracy were obtained for concentrations over the standard curve range. The retention times were 5.13 min and 9.08 min for metaxalone and IS respectively. The extraction recovery of metaxalone from pharmaceutical dosage form (tablets) was >97% and the calibration curve was linear (r2= 0.999) over the entire linear range. The method had an accuracy of >98% and LOD and LOQ of 0.2 µg/mL and 0.6 µg/mL respectively. The specificity of the proposed method was performed whereby metaxalone undergoes different stress conditions like oxidation, reduction, photolysis, acid and alkaline hydrolysis.

Development and Validation of an RP-HPLC Method for Determination of Atorvastatin and its Hydroxyl Metabolites in Human Plasma

2020 ◽  
Vol 16 (3) ◽  
pp. 238-245
Author(s):  
Dagmara Sowińska ◽  
Alicja Pogorzelska ◽  
Marlena Rakicka ◽  
Justyna Sznura ◽  
Justyna Janowska ◽  
...  
Keyword(s):  
Human Plasma ◽  
Internal Standard ◽  
Hplc Method ◽  
Active Metabolites ◽  
Peak Separation ◽  
Rp Hplc ◽  
Increased Risk ◽  
Relative Standard ◽  
Development And Validation

Background: Atorvastatin (AT) belongs to cholesterol-lowering agents, commonly used in patients with an increased risk of cardiovascular disease. The drug, as well as its hydroxyl metabolites, exhibit pharmacological activity, and their plasma levels may be helpful in the assessment of the therapeutic effectiveness. Objective: Development and validation of a fast and reproducible RP-HPLC method with UV detection for the simultaneous determination of atorvastatin and its active metabolites, para-hydroxy-atorvastatin (p-OH-AT) and ortho-hydroxy-atorvastatin (o-OH-AT) in human plasma. Methods: Optimal conditions of chromatographic separation of the analytes, as well as rosuvastatin, chosen as an internal standard, were studied. The absorbance of the compounds was measured at λ=248 nm. Validation of the method was performed. The usefulness of the method was confirmed for determination of the analytes in plasma of patients treated with the drug. Results: Total peak separation was achieved at LiChrospher 100 RP-18 column with a mobile phase composed of methanol and water (1:1,v:v) and a flow rate of 1.2 ml/min. The method was linear in the ranges of 0.025 - 1.0 μg/ml for AT, o-OH-AT and p-OH-AT. Intra- and inter-assay precision expressed as relative standard deviation was ≤13% for AT, ≤12% for p-OH-AT and ≤11% for o-OH-AT. Intraand inter-day accuracy of the method, expressed as a relative error, was ≤15%. Conclusion: The elaborated HPLC method is specific, repeatable, reproducible, adequately accurate and precise and fulfills the validation requirements for the bioanalytical method. The method was successfully applied for analysis of atorvastatin and its o-hydroxy metabolite in plasma of patients treated with the drug.

DEVELOPMENT AND VALIDATION OF NEW RP–HPLC METHOD FOR DETERMINATION OF BESIFLOXACIN IN ANIMAL MODEL

INDIAN DRUGS ◽  
2015 ◽  
Vol 52 (01) ◽  
pp. 26-32
Author(s):  
A Singh ◽  
◽  
C. L Singh ◽  
S. Kumar ◽  
M. Kumar
Keyword(s):  
High Performance ◽  
Internal Standard ◽  
Rat Plasma ◽  
Reversed Phase ◽  
Hplc Method ◽  
Standard Curve ◽  
Absorbance Detection ◽  
Rp Hplc ◽  
Ich Guidelines ◽  
Development And Validation

A sensitive and accurate reversed– phase high performance liquid chromatography (RP-HPLC) method with UV absorbance detection at 289 nm was developed and validated for the determination and quantification of besifloxacin (BSF) in rat plasma. Ofloxacin was used as an internal standard (IS). The sample was prepared by liquid extraction of BSF from plasma, using methanol and acetonitrile (70:30). The chromatographic separation was achieved with octadecylsilane (ODS-3), Hypersil® C18 column (250 mm×6mm×5μm). The chromatographic runtime was less than 5 minutes where the retention time of internal standard and the drug was 2.15 min and 3.30 min respectively. A standard curve with a regression coefficient (r2) 0.999 was obtained in the range of 0.025-20 μg/mL. The method was validated with respect to linearity, range, precision, accuracy and robustness according to ICH guidelines. The method was found to be accurate and robust with a runtime of less than 5 minutes. Hence, the present method was rapid and economical to use for clinical studies as well as to analyze the drug in different plasma samples.

scholarly journals Development and Validation of LC Method for the Determination of Famciclovir in Pharmaceutical Formulation Using an Experimental Design

2008 ◽  
Vol 5 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Srinivas Vishnumulaka ◽  
Narasimha Rao Medicherla ◽  
Allam Appa Rao ◽  
G. Edela Srinubabu
Keyword(s):  
Experimental Design ◽  
Flow Rate ◽  
Mobile Phase ◽  
Internal Standard ◽  
Pharmaceutical Formulations ◽  
Hplc Method ◽  
Internal Standard Method ◽  
Intermediate Precision ◽  
Mobile Phase Flow Rate ◽  
Development And Validation

A rapid and sensitive RP-HPLC method with UV detection (242 nm) for routine analysis of famciclovir in pharmaceutical formulations was developed. Chromatography was performed with mobile phase containing a mixture of methanol and phosphate buffer (50:50,v/v) with flow rate 1.0 mL min−1. Quantitation was accomplished with internal standard method. The procedure was validated for linearity (correlation coefficient =0.9999), accuracy, robustness and intermediate precision. Experimental design was used for validation of robustness and intermediate precision. To test robustness, three factors were considered; percentage v/v of methanol in mobile phase, flow rate and pH; flow rate, the percentage of organic modifier and pH have considerable important effect on the response. For intermediate precision measure the variables considered were: analyst, equipment and number of days. The RSD value (0.86%,n=24) indicated an acceptable precision of the analytical method. The proposed method was simple, sensitive, precise, accurate and quick and useful for routine quality control.

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