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Simultaneous determination of sulpiride and mebeverine by HPLC method using fluorescence detection: application to real human plasma.
Walash MI, Kh Sharaf El-Din MM, El-Enany NM, Eid MI, Shalan SM. Walash MI, et al. Chem Cent J. 2012 Feb 14;6:13. doi: 10.1186/1752-153X-6-13. Chem Cent J. 2012. PMID: 22333299 Free PMC article.
., 5 m particle size Waters®-C18 column using isocractic mobile phase containing a mixture of acetonitrile and 0.01 M dihydrogenphosphate buffer (45:55) at pH = 4.0. ...For real human plasma, the mean% recoveries (n = 3) were and respectively....
., 5 m particle size Waters®-C18 column using isocractic mobile phase containing a mixture of acetonitrile and 0.01 M dihydrog …
Voltammetric analysis of certain 4-quinolones in pharmaceuticals and biological fluids.
Rizk M, Belal F, Ibrahim F, Ahmed S, El-Enany NM. Rizk M, et al. J Pharm Biomed Anal. 2000 Dec 15;24(2):211-8. doi: 10.1016/s0731-7085(00)00401-5. J Pharm Biomed Anal. 2000. PMID: 11130200
The diffusion current concentration relationships were found to be rectilinear over the ranges 4 x 10(-5) x 10(-4) M, 1 x 10(-5)-2 x 10(-4) M, 1 x 10(-5)-4 x 10(-4) M using DCt mode for I, II and III, respectively and 1 x 10(-6)-4 x 10(-5) M, 1 x 10(-6 …
The diffusion current concentration relationships were found to be rectilinear over the ranges 4 x 10(-5) x 10(-4) M, 1 x 10(-5)-2 x …
Simultaneous determination of zopiclone and its degradation product and main impurity (2-amino-5-chloropyridine) by micellar liquid chromatography with time-programmed fluorescence detection: preliminary investigation for biological monitoring.
El-Shaheny RN, Alattas A, Nasr JJ, El-Enany N, Belal F. El-Shaheny RN, et al. J Chromatogr B Analyt Technol Biomed Life Sci. 2012 Oct 15;907:49-55. doi: 10.1016/j.jchromb.2012.08.034. Epub 2012 Sep 6. J Chromatogr B Analyt Technol Biomed Life Sci. 2012. PMID: 22999478
The analyses were carried out on BDS Hypersil phenyl column (4.6 mm × 250 mm, 5 μm particle size) using micellar mobile phase consisting of 0.15M SDS, 10% n-propanol, 0.3% triethylamine, and 0.02 M orthophosphoric acid (pH 3.5) with timed programmable fluorescence d …
The analyses were carried out on BDS Hypersil phenyl column (4.6 mm × 250 mm, 5 μm particle size) using micellar mobile phase consisting of …
Simultaneous determination of floctafenine and its hydrolytic degradation product floctafenic acid using micellar liquid chromatography with applications to tablets and human plasma.
Walash MI, Belal F, El-Enany N, Eid M, El-Shaheny RN. Walash MI, et al. J AOAC Int. 2013 Nov-Dec;96(6):1315-24. doi: 10.5740/jaoacint.11-255. J AOAC Int. 2013. PMID: 24645510
The analysis was carried out on a CLC Shim-Pack octyl silane (C8) column (150 x 4.6 mm id, 5 microm particle size) using a micellar mobile phase consisting of 0.15 M sodium dodecyl sulfate, 10% n-propanol, and 0.3% triethylamine in 0.02 M orthophosphoric acid …
The analysis was carried out on a CLC Shim-Pack octyl silane (C8) column (150 x 4.6 mm id, 5 microm particle size) using a micellar mobile p …
The alternating current polarographic behavior and determination of lansoprazole and omeprazole in dosage forms and biological fluids.
El-Enany N, Belal F, Rizk M. El-Enany N, et al. J Biochem Biophys Methods. 2008 Apr 24;70(6):889-96. doi: 10.1016/j.jprot.2008.02.002. Epub 2008 Feb 26. J Biochem Biophys Methods. 2008. PMID: 18395265
The minimum detection limits (S/N=2) were 0.02 microg mL(-1) (5.4x10(-8) M) and 0.01 microg mL(-1) (2.9x10(-8) M) for LNS and OMP, respectively. ...The proposed method was further extended to the in-vitro determination of the lansoprazole in spiked plasma, th …
The minimum detection limits (S/N=2) were 0.02 microg mL(-1) (5.4x10(-8) M) and 0.01 microg mL(-1) (2.9x10(-8) M) for L …
Spectrofluorimetric and spectrophotometric determination of gliclazide in pharmaceuticals by derivatization with 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole.
El-Enany N. El-Enany N. J AOAC Int. 2003 Mar-Apr;86(2):209-14. J AOAC Int. 2003. PMID: 12723907
The absorbance-concentration plot was rectilinear over the range of 2-20 microg/mL with minimum detectability [signal-to-noise (S/N) ratio = 2] of 0.2 microg/mL (6.18 x 10(-7) M); the fluorescence-concentration plot was rectilinear over the range of 0.2-2.5 microg/m …
The absorbance-concentration plot was rectilinear over the range of 2-20 microg/mL with minimum detectability [signal-to-noise (S/N) …
Spectrophotometric determination of gliclazide in pharmaceuticals and biological fluids through ternary complex formation with eosin and palladium (II).
El-Enany N. El-Enany N. Farmaco. 2004 Jan;59(1):63-9. doi: 10.1016/j.farmac.2003.08.007. Farmaco. 2004. PMID: 14751318
The solution of ternary complex obeyed Beer's law over the concentration range of 0.5-4 microg ml(-1) with minimum detectability (S/N = 2) of 0.05 microg ml(-1) (1.545 x 10(-7) M). ...The proposed method was further applied to spiked human urine and plasma, the perc …
The solution of ternary complex obeyed Beer's law over the concentration range of 0.5-4 microg ml(-1) with minimum detectability (S/N
Spectrofluorometric determination of fluvoxamine in dosage forms, spiked plasma, and real human plasma by derivatization with fluorescamine.
El-Enany N. El-Enany N. J AOAC Int. 2007 Mar-Apr;90(2):376-83. J AOAC Int. 2007. PMID: 17474508
The method was applied for the determination of the drug over the concentration range of 0.1-1.1 microg/mL with a detection limit of 0.01 microg/mL (2 x 10(-8) M). ...The method was applied for the determination of FXM in spiked human plasma with recovery (n=4) of 9 …
The method was applied for the determination of the drug over the concentration range of 0.1-1.1 microg/mL with a detection limit of 0.01 mi …
Differential pulse polarographic determination of ofloxacin in pharmaceuticals and biological fluids.
Rizk M, Belal F, Aly FA, El-Enany NM. Rizk M, et al. Talanta. 1998 May;46(1):83-9. doi: 10.1016/s0039-9140(97)00249-x. Talanta. 1998. PMID: 18967130
The current-concentration relationship was found to be rectilinear over the range 5x10(-5)-5x10(-4) M and 1x10(-5)-5x10(-4) M using the DC(t) and DPP modes respectively, with a minimum detectability (S/N=3) of 3x10(-7) M. ...
The current-concentration relationship was found to be rectilinear over the range 5x10(-5)-5x10(-4) M and 1x10(-5)-5x10(-4) M
Voltammetric analysis of trazodone HCl in pharmaceuticals and biological fluids.
EL-Enany N, Belal F, Rizk M. EL-Enany N, et al. J Pharm Biomed Anal. 2002 Sep 5;30(2):219-26. doi: 10.1016/s0731-7085(02)00327-8. J Pharm Biomed Anal. 2002. PMID: 12191706
At pH 10, the diffusion current-concentration relationship was found to be rectilinear over the range 4-32 and 0.8-24 microg ml(-1) using DC(t) and DPP modes, respectively, with minimum detectability (S/N=2) of 0.104 microg ml(-1) (2.45 x 10(-6) M) and 0.314 microg …
At pH 10, the diffusion current-concentration relationship was found to be rectilinear over the range 4-32 and 0.8-24 microg ml(-1) using DC …
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