scholarly journals Oxytetracycline Residues in Honey Analyzed by Liquid Chromatography with UV Detection

2013 ◽  
Vol 57 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Anna Gajda ◽  
Andrzej Posyniak ◽  
Andrzej Bober ◽  
Tomasz Błądek ◽  
Jan Żmudzki
Keyword(s):  
Liquid Chromatography ◽  
Oxalic Acid ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Experimental Treatment ◽  
Uv Detection ◽  
Limit Of Quantification ◽  
Chromatography Method ◽  
Liquid Chromatography Method

Summary A liquid chromatography method with UV detection for determination of oxytetracycline (OTC) in honey has been developed. The samples were extracted with the solution of oxalic acid. The clean-up procedure was performed by solid phase extraction (SPE) using polymeric Strata X and carboxylic acid cartridges. Chromatographic separation was carried out on the Luna C8 analytical column with mobile phase consisting of acetonitrile-0.02 M oxalic acid. The method has been successfully validated according to the requirements of the European Decision 2002/657/EC and this method is used in routine control of oxytetracycline in honey samples. The limit of detection (LOD) and limit of quantification (LOQ) of the presented method were 10 and 12.5 μg/kg, respectively. The developed method has also been verified in quantitative determination of oxytetracycline residues in honey after experimental treatment with this product in bee colonies.

scholarly journals DEVELOPMENT AND VALIDATION OF A STABILITY INDICATING REVERSE PHASEHIGH PERFORMANCE LIQUID CHROMATOGRAPHY METHOD FOR SIMULTANEOUS DETERMINATION OF CLINDAMYCIN, METRONIDAZOLE, AND CLOTRIMAZOLE IN PHARMACEUTICAL COMBINED DOSAGE FORMS

2016 ◽  
Vol 10 (1) ◽  
pp. 111 ◽  
Author(s):  
Revathi Naga Lakshmi Ponnuri ◽  
Prahlad Pragallapati ◽  
Mastanamma Sk ◽  
Ravindra N ◽  
Venkata Basaveswara Rao Mandava ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
High Performance ◽  
Limit Of Detection ◽  
Degradation Products ◽  
Reverse Phase ◽  
Limit Of Quantification ◽  
Chromatography Method ◽  
Liquid Chromatography Method

ABSTRACTObjective: The objective of present work was to develop and validate a simple, fast, precise, selective, and accurate reverse phase high-performanceliquid chromatography method for the simultaneous determination of Clindamycine, Metronidazole and Clotrimazole in a pharmaceutical dosageform.Methods: The separation of these three drugs was achieved on ODS 250×4.6 mm, 5 mm C column. Mobile phase containing 0.1% ortho phosphoricacid buffer and acetonitrile in the ratio of 55:45 v/v was pumped through column at a flow rate of 1 ml/minute. Temperature was maintained at 30°Cand ultraviolet detection at 238 nm.18Results: The retention times were observed to be 2.591, 3.584, and 4.221 minutes for Clindamycine, Metronidazole, and Clotrimazole, respectively.Linearity was found to be 25-150 μg/ml Clindamycine, Metronidazole, and Clotrimazole, respectively. The method was statistically validated forlinearity, recovery, the limit of detection (LOD), limit of quantification (LOQ), accuracy, and precision. The stress testing of the drugs individually andtheir mixture are carried out under acidic, alkaline, oxidation, photostability, and thermal degradation conditions and its degradation products arewell resolved from the analyte peaks.Conclusion: This method was successfully validated for accuracy, precision, and linearity, LOD, and LOQ.Keywords: Clindamycine, Metronidazole, Clotrimazole, Reverse phase-high performance liquid chromatography, Simultaneous determination,Degradation studies.

A green liquid chromatography method for rapid determination of ergosterol in edible fungi based on matrix solid-phase dispersion extraction and a core–shell column

2020 ◽  
Vol 12 (26) ◽  
pp. 3337-3343 ◽  
Author(s):  
Zhengming Qian ◽  
Zi Wu ◽  
Chunhong Li ◽  
Guoying Tan ◽  
Hankun Hu ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Solid Phase ◽  
Rapid Determination ◽  
Edible Fungi ◽  
Chromatography Method ◽  
Matrix Solid Phase Dispersion ◽  
Phase Dispersion ◽  
Liquid Chromatography Method ◽  
Extraction Liquid

A green and rapid matrix solid-phase dispersion extraction-liquid chromatography analytical method for the determination of ergosterol in edible fungi was established.

scholarly journals Determination of Formaldehyde by HPLC with Stable Precolumn Derivatization in Egyptian Dairy Products

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Ahmed Salem Sebaei ◽  
Ahmed M. Gomaa ◽  
A. A. El-Zwahry ◽  
E. A. Emara
Keyword(s):  
Dairy Products ◽  
High Performance ◽  
Limit Of Detection ◽  
Precolumn Derivatization ◽  
Limit Of Quantification ◽  
Chromatography Method ◽  
Derivatizing Agent ◽  
Array Detection ◽  
Liquid Chromatography Method

Formaldehyde is one of the most dangerous chemical compounds affecting the human health; exposure to it from food may occur naturally or by intentional addition. In this study a high performance liquid chromatography method for determination of formaldehyde in dairy products was described. The dairy samples were reacted and extracted with a warmed organic solvent in the presence of derivatizing agent 2,4-dinitrophenylhydrazine (DNPH) and formaldehyde; the mixture was centrifuged and followed by diode array detection. The method is validated and gives average recovery of formaldehyde at the three different levels 0.1, 5.0, and 10.0 mg/kg varied between 89% and 96%. The method is linear from the limit of quantification 0.1 mg/kg up to 10 mg/kg levels. This method is intended for formaldehyde analyses in dairy products simply with stable derivatization, minimum residue loss, excellent recovery, and accurate results with a sensitive limit of detection 0.01 mg/kg. 90 dairy samples from milk, cheese, and yogurt were investigated from seven Egyptian governorates and all samples were free from formaldehyde.

RAPID HIGH PERFORMANCE LIQUID CHROMATOGRAPHY METHOD FOR THE DETERMINATION OF RALTEGRAVIR IN HUMAN SALIVA

INDIAN DRUGS ◽  
2019 ◽  
Vol 56 (09) ◽  
pp. 68-73
Author(s):  
K Vijaya Sri ◽  
M. Shiva Kumar ◽  
M. A. Madhuri ◽  
Suresha K. ◽  
Keyword(s):  
High Performance ◽  
Limit Of Detection ◽  
High Performance Liquid Chromatographic ◽  
Human Saliva ◽  
Hplc Method ◽  
Limit Of Quantification ◽  
Chromatography Method ◽  
Liquid Chromatography Method ◽  
Liquid Chromatographic

In this study, a high-performance liquid chromatographic method (HPLC) was developed, validated and applied for the determination of raltegravir in biological sample like saliva. Liquid- liquid extraction was performed for isolation of the drug and elimination of saliva interferences. Samples of saliva was extracted with 50µL of ortho phosphoric acid and 3ml of methanol was added and spiked with raltegravir. The chromatographic separation was performed on Agilent Eclipse C18 (100 mm × 4.6 mm, 3.5µm) column, by using 80:20 v/v acetonitrile: water as a mobile phase under isocratic conditions at a flow rate of 1.0 mL/min for UV detection at 240 nm. Retention time of raltegravir was found to be 1.030 min. Linearity was found to be in the range of 25-1000 ng/mL with regression equation y = 13864x + 40495 and correlation coefficient 0.999. The low % RSD value indicates the method is accurate and precise. The limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.76 and 2.28 ng/mL, respectively. It can be concluded that this validated HPLC method is easy, precise, accurate, sensitive and selective for determination of raltegravir in saliva.

Aquatic Products Determination of Nonylphenol and Octylphenol

2013 ◽  
Vol 340 ◽  
pp. 388-391 ◽  
Author(s):  
Xiang Ke Cao ◽  
Qing Zeng Qian ◽  
Jun Wang Tong ◽  
Qian Wang
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Phase Extraction ◽  
Chromatography Method ◽  
Aquatic Product ◽  
Liquid Chromatography Method

By solid - phase extraction high performance liquid chromatography determination of nonylphenol, Octylphenol in aquatic product residues, to establish more accurate, fast, effective detection method. Sample is 3 trichloroacetic acid solution after extraction, using anion exchange solid phase extraction column purification by reversed phase high performance liquid chromatography method for determination. Column is Shim-pack VP-ODS 250mm x4.6mm, detection wavelength is225 nm, mobile phase of methanol - water ( volume ratio of 75:25), flow rate is 0.8 mL/min, injection volume is 20 ìL. Octylphenol, nonylphenol respectively in 0.14¡«97.63 ìg/mL ( R=0.9995),0.02¡«51.04 ì g/mL ( R=0.9997) concentration and peak area show a good linear relationship, octylphenol nonylphenol and the recovery is 87.9%¡«93.8%, relative standard deviation is 1.4%¡«3.8%. Solid - phase extraction high performance liquid chromatography method for determination of aquatic product of octylphenol and nonylphenol residue is accurate, rapid, high sensitivity, suitable for aquatic products of octylphenol nonylphenol and detection.

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