scholarly journals Analytical Method of Automotive Exhaust Carbonyls by High Performance Liquid Chromatography.

1998 ◽  
Vol 8 (4) ◽  
pp. 847-855 ◽  
Author(s):  
Akemi IWAMOTO ◽  
Sousuke SASAKI ◽  
Ken-ichi AKIYAMA
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Analytical Method ◽  
High Performance ◽  
Automotive Exhaust

scholarly journals Validation of high performance liquid chromatography method for determination of meloxicam loaded PEGylated nanocapsules

2015 ◽  
Vol 51 (4) ◽  
pp. 823-832 ◽  
Author(s):  
Francine Rodrigues Ianiski ◽  
Luciane Varini Laporta ◽  
Alexandre Machado Rubim ◽  
Cristiane Luchese
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Zeta Potential ◽  
Analytical Method ◽  
High Performance ◽  
Ph Value ◽  
Hplc Method ◽  
Polydispersity Index ◽  
Size Distributions ◽  
Relative Standard

abstract A method to ensure that an analytical method will produce reliable and interpretable information about the sample must first be validated, making sure that the results can be trusted and traced. In this study, we propose to validate an analytical high performance liquid chromatography (HPLC) method for the quantitation of meloxicam loaded PEGylated nanocapsules(M-PEGNC). We performed a validation study, evaluated parameters including specificity, linearity, quantification limit, detection limit, accuracy, precision and robustness. PEGylated nanocapsules were prepared by interfacial deposition of preformed polymer, and the particle size, polydispersity index, zeta potential, pH value and encapsulation efficiency were characterized. The proposed HPLC method provides selective, linear results in the range of 1.0-40.0 μg/mL; quantification and detection limits were 1.78 μg/mL and 0.59 μg/mL, respectively; relative standard deviation for repeatability was 1.35% and intermediate precision was 0.41% and 0.61% for analyst 1 and analyst 2, respectively; accuracy between 99.23 and 101.79%; robustness between 97.13 and 98.45% for the quantification of M-PEGNC. Mean particle diameters were 261 ± 13 nm and 249 ± 20 nm, polydispersity index was 0.15 ± 0.07 and 0.17 ± 0.06, pH values were 5.0 ± 0.2 and 5.2 ± 0.1, and zeta-potential values were -37.9 ± 3.2 mV e -31.8 ± 2.8 mV for M-PEGNC and placebo(B-PEGNC), respectively. In conclusion, the proposed analytical method is suitable for the quality control of M-PEGNC. Moreover, suspensions showed monomodal size distributions and low polydispersity index indicating high homogeneity of formulations with narrow size distributions, and appropriate pH and zeta potential. The extraction process was efficient for release of meloxicam from nanostructured systems.

Determination of Chloramphenicol, Thiamphenicol and Florfenicol in Chinese Gelatin Medicines using Dispersive Solid-Phase Extraction Coupled with Ultra High-Performance Liquid Chromatography-Mass Spectrometry.

2020 ◽  
Vol 58 (5) ◽  
pp. 471-476 ◽  
Author(s):  
Jiong Li ◽  
Jinyan Gong ◽  
Haina Yuan ◽  
Gongnian Xiao ◽  
Hongqing Wang ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Matrix Effect ◽  
Analytical Method ◽  
High Performance ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Ammonium Hydroxide ◽  
Drug Residues ◽  
Protein Components

Abstract This study established a rapid and reliable method to determine chloramphenicol (CAP), thiamphenicol (TAP) and florfenicol (FF) residues in Chinese gelatin medicines. CAP, TAP and FF were extracted from medicine samples using 2% (v/v) ammonium hydroxide in acetonitrile. Trypsin was used to eliminate the matrix effect caused by protein components in gelatin medicines, whereas anhydrous sodium sulfate, C18-N and NH2-PSA adsorbents were applied to reduce matrix effect induced by other components. The analytical method of these drugs was optimized on ultra high-performance liquid chromatography-mass spectrometer (UHPLC-MS/MS) through the analysis of their standard linearity and regression. The optimized extraction and analytical method were validated in one Chinese gelatin medicine sample (Colla corii asini, E Jiao) with three fortification levels (2, 5 and 10 μg/kg), and the recoveries of these drug residues ranged of 87.6–102.7%. The limit of detection and quantification of CAP, TAP and FF in the sample were 0.2 and 0.5 μg/kg, 0.4 and 1.5 μg/kg, and 0.5 and 1.5 μg/kg, respectively. A total of 30 Chinese gelatin medicine samples were analyzed using the established method. No drug residues were found in these samples except for one Testudinis Carapacis et Plastri (1.67 μg/kg FF) and one turtle shell glue (2.55 μg/kg FF).

scholarly journals DEVELOPMENT OF A DIRECT METHOD OF ANALYZING TRANEXAMIC ACID LEVELS IN WHITENING CREAM USING REVERSED PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY

2020 ◽  
pp. 88-92
Author(s):  
BAITHA PALANGGATAN MAGGADANI ◽  
JIHAN YASMINA ◽  
HARMITA HARMITA
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Tranexamic Acid ◽  
Analytical Method ◽  
High Performance ◽  
Limit Of Detection ◽  
Direct Method ◽  
Pharmaceutical Products ◽  
Optimal Method ◽  
Limit Of Quantitation

Objective: Whitening cream is a cosmetic that contains ingredients that can alleviate hyperpigmentation. Tranexamic acid (TA) is one of the potentialanti-pigmentation agents that work through inhibiting plasmin. TA is used in cosmetic formulations at a concentration of 2.5% as a whitening andmoisturizing agent. To date, research on TA in both cosmetics and other pharmaceutical products using high-performance liquid chromatography(HPLC) has not been done directly (without derivatization). Therefore, this study aimed to develop a simple and rapid analytical method for TA(without derivatization) in cosmetic cream samples using reverse-phase HPLC and water as a solvent.Methods: Optimization was conducted by evaluating several parameters that affect sample extraction, as well as composition and mobile phasetypes. The optimal method must fulfill suitability and validation requirements. The optimal method should be able to detect and quantify TA in creamsamples without derivatization.Results: The optimal analysis condition used a ultraviolet detector at a wavelength of 210 nm, acetonitrile: double-distilled water: phosphoric acid(64:34:2) as the mobile phase and a flow rate of 0.8 mL/min. The retention time of the analyte occurred in the 2nd min.Conclusion: The analytical method that met the validation requirements was characterized using parameters such as accuracy, precision, linearity,selectivity, limit, of detection, and limit of quantitation. This method is applicable for analyzing TA content in samples with a concentration of 1.02%.

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