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Transfer of TLC screening methods to quantitative HPTLC–densitometry methods for pharmaceutical products containing amlodipine besylate, cefpodoxime proxetil, cetirizine 2HCl, diclofenac sodium, efavirenz, mefenamic acid, and atovaquone + proguanil HCl

Zeng B., Gu Y., Sherma J.

Acta Chromatographica

2019

Vol. 31, no. 4

246--249

Transfer of seven thin-layer chromatography (TLC) Global Pharma Health Fund E.V. Minilab protocols for screening counterfeit pharmaceutical products in the field to quantitative high-performance TLC (HPTLC)–densitometry methods was performed using a model process published previously. The developed and validated methods for tablets containing amlodipine besylate, cefpodoxime proxetil, cetirizine 2HCl, diclofenac sodium, efavirenz, mefenamic acid, and atovaquone + proguanil HCl involved the use of only relatively inexpensive and nontoxic solvents, Merck KGaA Premium Purity HPTLC silica gel 60 F254 plates, semi-automated sample and standard solution application with a CAMAG Linomat 4, and automated densitometry with a CAMAG Scanner 3 for detection, identification, and quantification. In addition, previously transferred HPTLC–densitometry methods for azithromycin and for cephalexin were used to analyze a new product of each drug to demonstrate the applicability of the methods.

Capillary electrophoresis-electrochemiluminescence method for simultaneous detection of azithromycin, roxithromycin and erythromycin ethylsuccinate

Wang Z., Yang Z., Ye J., Tan G., Xu H., Liu Y.

Chemia Analityczna

2009

Vol. 54, No. 5

883-894

In this paper, a capillary electrophoresis-electrochemiluminescence method for simulta- ' neous detection of three macrolide antibiotics: azithromycin (ATM), roxithromycin (RTM) and erythromycin ethylsuccinate (ETMES) has been presented. The method is based upon the enhancement effect of these compounds on electrochemiluminescence of tris(2,2- , bipyridyl) ruthenium(II) (Ru(bpy)32+). Under the optimized conditions, complete separation of ATM, RTM and ETMES was achieved within 6 min using 20 mmol L -1phosphate buffer of pH 7.3 as a background electrolyte and applying a separation voltage of 20 kV. Detection limits were 0.1 μmol L-1 for ATM, 0.2 μmol L-1 for RTM, and 0.4 umol L-1 for ETMES (S/N = 3). Relative standard deviations for all analytes were below 5%. The proposed method has been successfully applied to the determination of the content of the studied compounds in spiked human plasma and urine samples.

Opracowano metodę elektroforezy kapilarnej z użyciem elektrochemiluminescencji do ., równoczesnego oznaczania trzech antybiotyków makrolidowych: azytromycyny (ATM), roksytromycyny (RTM) oraz etylobursztynianu erytromycyny (ETMES). Metoda wykorzystuje wzmocnienie przez badane antybiotyki elektrochemiluminescencji tris(2.2-bipi-rydylo)rutenu (Ru(bpy)+2. W optymalnych warunkach w czasie 6 min uzyskano całkowite rozdzielenie ATM, RTM i ETMES stosując 20 mmol L-1 bufor fosforanowy o pH 7,3 jako elektrolit podstawowy, przy napięciu 20 kV. Granica wykrywalności ATP, RTP i ETMES ' wynosiła odpowiednio: 0,1; 0,2 i 0,4 μ mol L-1(S/N = 3). Względne odchylenie standardowe wszystkich elektrolitów było pniżej 5%. Proponowana metoda została z powodzeniem zastosowana do oznaczania zawrtości badanych związków w próbkach krwi i moczu.