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1
Content available remote Determination of ampicillin and amoxicillin by high-performance thin-layer chromatography
Ghoulipour V., Shokri M, Waqif-Husain S.
Acta Chromatographica
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2011
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Vol. 23, no. 3
483--498
EN
A simple and fast high-performance thin-layer chromatographic method has been developed for the simultaneous determination of ampicillin and amoxicillin. Titanium(IV) silicate (a synthetic inorganic ion-exchanger)-coated thin-layer chromatography (TLC) plates were used to separate them, employing a mixture of K2HPO4 (0.1 M) + KH2PO4 (0.1 M), 1:1 (υ/υ), as mobile phase. The development time was 18 min. The plates were sprayed with fresh 1% solution of ninhydrin in ethanol. The developed method enables highly contrasted chromatograms with red purple spots in white background. Densitometric measurements were made at wavelength 546 nm using Camag TLC Scanner-3. The ampicillin and amoxicillin recovery of the total procedure were equal to 99.99 and 100.43, respectively. The procedure is quantitatively characterized. Linearities were r2 > 0.9958 and 0.9954 for ampicillin and amoxicillin, respectively, and the relative standard deviations were <0.89 and 0.61, respectively. The limits of detection were 2.9 and 1.5 ng per spot and the limits of quantification were 14.5 and 7.5 ng per spot, respectively. The method is rapid, selective, precise, and accurate and thus can be used for the routine analysis of pharmaceutical preparations in quality control laboratories of the pharmaceutical industry. The method is successfully applied for the determination of ampicillin and amoxicillin in human blood plasma and urine.
2
Content available remote Rapid chromatographic separation of food additives on thin layers of an inorganic ion-exchanger
Purghazi K., Ghoulipour V., Waqif-Husain S., Mirzaie A.
Acta Chromatographica
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2007
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No. 18
219-225
EN
The chromatographic behaviour of ascorbic acid, benzoic acid, butylated hydroxyanisole, butylated hydroxytoluene, butyraldehyde, butyric acid, cinnamaldehyde, citric acid, ethyl acrylate, ethyl benzoate, ethyl phydroxybenzoate, fumaric acid, lactic acid, lauric acid, maleic acid, methyl p-hydroxybenzoate, oleic acid, p-hydroxybenzoic acid, propionic acid, propyl gallate, propyl p-hydroxybenzoate, salicylic acid, sodium benzoate, and sorbic acid has been studied on thin layers of stannic silicate ion-exchanger with several aqueous, organic, and mixed mobile phases. Rapid separations of one food additive from many other food additives, and ternary and binary separations, are reported.
3
Content available remote Chromatographic behavior of performance-enhancing drugs on thin layers of bismuth silicate ion exchanger
Hassankhani-Majd Z., Ghoulipour V., Husain S. W.
Acta Chromatographica
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2006
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No. 16
173-180
EN
The chromatographic behavior of amphetamine, bemegride, caffeine, chlorphentermine, ephedrine, ethylamphetamine, isoproterenol, methadone, methylendioxyamphetamine, pentazocine, pethidine, pemoline, strychnine, and salbutamol has been studied on thin layers of bismuth silicate anion exchanger with organic, aqueous, and mixed organic-aqueous mobile phases. Rapid separations of one drug from many other drugs and also many quaternary, ternary, and binary separations have been achieved and are discussed. A new variable, SRF has been introduced to quantify the separating power of the bismuth silicate anion exchanger in thin-layer chromatography.
4
Content available remote Chromatographic behaviour of antibiotics on thin layers of an inorganic ion-exchanger
Husain S. W., Ghoulipour V., Sepahrian H.
Acta Chromatographica
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2004
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No. 14
102-109
EN
The chromatographic behaviour of amoxicillin, ampicillin, cepha-lexin, cloxacillin, doxycycline, tetracycline, erythromycin, gentamycin, stre-ptomycin, and co-trimoxazole has been studied on thin layers of titanic silicate inorganic ion-exchanger with organic, aqueous, and mixed aqueous–organic mobile phases. Rapid separations of one antibiotic from numerous other antibiotics have been achieved, as have many binary and ternary separations. Salting-out TLC using aqueous ammonium sulphate solutions revealed the dependence of RF values on the concentration of salt in the mobile phase, and the existence of a linear relationship between RM and molarity of (NH4)2SO4 for some antibiotics. The effect of varying the vo-lume ratio of the binary mobile phase methanol–0.1 M formic acid on the RF values of the antibiotics has also been studied.
5
Content available remote Inorganic ion-exchangers for quantitative TLC of toxic elements. V. Separation and determination of chromium(VI)
Ghoulipour V., Husain S. W.
Acta Chromatographica
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2002
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No. 12
170-176
EN
A simple, rapid, and selective method has been developed for the separation and determination of Cr(VI) from Al(III), Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Se(IV), Sr(II), Zr(IV), Cd(II), La(III), Ce(III), Hg(II), and U(VI). Separation was accomplished in 12.5 cm migration distance and 14 min migration time on titanic silicate ion-exchange plates with 0.4 M ammonium oxalate - 2.2 M aqueous ammonia, 1:1 (v/v), as mobile phase. Quantitative measurement of the separated zones of Cr(VI) was achieved by scanning densitometry at ? = 545 nm.
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