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Afshin MIrzaie

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Papers by Afshin MIrzaie

Research paper thumbnail of Fast Chromatographic Separation of Plasticizers on Thin Layers of an Inorganic Ion-Exchanger: Quantitative Determination of Di(2-ethylhexyl)phthalate

Chromatographia, 2006

Fast and selective separation of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2et... more Fast and selective separation of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2ethylhexyl)phthalate (DEHP), benzyl butyl phthalate, diisodecyl phthalate, dimethyl adipate, diethyl adipate, di(2-ethylhexyl)adipate, triethyl citrate, tributyl citrate, tributyl acetyl citrate and n-butyl stearate have been developed on thin layers of inorganic ion-exchanger stannic silicate using a mixture of toluene + ethyl acetate (10:1, v/v) as mobile phase. The development distance and time were 12 cm and 25 min, respectively. Quantitative determination of DEHP was made at wavelength 280 nm by Camag TLC Scanner-3. Limit of quantitation for DEHP was 0.50 lg per zone while its limit of detection was 0.05 lg per zone.

Research paper thumbnail of Liquid phase microextraction-ion exchange-high performance thin layer chromatography for the preconcentration, separation, and determination of plasticizers in aqueous samples

Journal of Separation Science, 2013

Liquid phase microextraction combined with ion-exchange-high performance thin layer chromatograph... more Liquid phase microextraction combined with ion-exchange-high performance thin layer chromatography has been developed for analysis of four plasticizers in aqueous samples. After their preconcentration by liquid phase microextraction, fast separation on thin layers of inorganic ion-exchanger stannic silicate has been developed using a mixture of toluene + ethyl acetate (10:1, v/v) as mobile phase. Consequently, densitometric quantitative determination of the plasticizers has been made at λ = 280 nm in reflection-absorption mode by Camag TLC scanner-3. The effects of type and volume of extraction solvent, stirring rate, extraction time, and ionic strength in the microextraction method have been also evaluated and optimized. The results show that the proposed method provides enhanced accuracy, linear range, LOD, and LOQ, and is very effective for analyzing the target compounds in water samples. Under the optimized conditions, preconcentration factor of 149-279 and extraction efficiency of 31-59% have been obtained. Repeatability (5.67-7.26%) and intermediate precision (6.21-8.17%) were in acceptable range. The relative recovery obtained for each analyte in different water samples was higher than 82.3% at three fortification levels with RSD <7.9%.

Research paper thumbnail of Application of liquid-liquid microextraction-high-performance thin-layer chromatography for preconcentration and determination of phenolic compounds in aqueous samples

JPC - Journal of Planar Chromatography - Modern TLC, 2011

Research paper thumbnail of Quantitative ion-exchange TLC of <i>p</i> -hydroxybenzoic acid in the presence of preservatives

JPC - Journal of Planar Chromatography - Modern TLC, 2007

Research paper thumbnail of TLC quantification of methylparaben on an inorganic ion-exchanger in the presence of other food additives

JPC - Journal of Planar Chromatography - Modern TLC, 2007

ABSTRACT Rapid separation of methyl p-hydroxybenzoate from ethyl p-hydroxybenzoate, propyl p-hydr... more ABSTRACT Rapid separation of methyl p-hydroxybenzoate from ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, p-hydroxybenzoic acid, benzoic acid, sodium benzoate, butylated hydroxyanisole, and butylated hydroxytoluen e has been achieved by TLC on the inorganic ion-exchanger stannic silicate with n-hexane-ethyl methyl ketone-acetic acid, 8 + 2 + 0.3 (v/v), as mobile phase. The development distance was 12 cm and development time 30 min. Quantitative analysis of the separated methylparaben was performed by scanning densitometry at lambda = 260 nm. The limits of detection (LOD) and quantitation (LOQ) were 0.29 and 0.50 mu g per zone, respectively.

Research paper thumbnail of Fast Chromatographic Separation of Plasticizers on Thin Layers of an Inorganic Ion-Exchanger: Quantitative Determination of Di(2-ethylhexyl)phthalate

Chromatographia, 2006

Fast and selective separation of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2et... more Fast and selective separation of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2ethylhexyl)phthalate (DEHP), benzyl butyl phthalate, diisodecyl phthalate, dimethyl adipate, diethyl adipate, di(2-ethylhexyl)adipate, triethyl citrate, tributyl citrate, tributyl acetyl citrate and n-butyl stearate have been developed on thin layers of inorganic ion-exchanger stannic silicate using a mixture of toluene + ethyl acetate (10:1, v/v) as mobile phase. The development distance and time were 12 cm and 25 min, respectively. Quantitative determination of DEHP was made at wavelength 280 nm by Camag TLC Scanner-3. Limit of quantitation for DEHP was 0.50 lg per zone while its limit of detection was 0.05 lg per zone.

Research paper thumbnail of Liquid phase microextraction-ion exchange-high performance thin layer chromatography for the preconcentration, separation, and determination of plasticizers in aqueous samples

Journal of Separation Science, 2013

Liquid phase microextraction combined with ion-exchange-high performance thin layer chromatograph... more Liquid phase microextraction combined with ion-exchange-high performance thin layer chromatography has been developed for analysis of four plasticizers in aqueous samples. After their preconcentration by liquid phase microextraction, fast separation on thin layers of inorganic ion-exchanger stannic silicate has been developed using a mixture of toluene + ethyl acetate (10:1, v/v) as mobile phase. Consequently, densitometric quantitative determination of the plasticizers has been made at λ = 280 nm in reflection-absorption mode by Camag TLC scanner-3. The effects of type and volume of extraction solvent, stirring rate, extraction time, and ionic strength in the microextraction method have been also evaluated and optimized. The results show that the proposed method provides enhanced accuracy, linear range, LOD, and LOQ, and is very effective for analyzing the target compounds in water samples. Under the optimized conditions, preconcentration factor of 149-279 and extraction efficiency of 31-59% have been obtained. Repeatability (5.67-7.26%) and intermediate precision (6.21-8.17%) were in acceptable range. The relative recovery obtained for each analyte in different water samples was higher than 82.3% at three fortification levels with RSD &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;7.9%.

Research paper thumbnail of Application of liquid-liquid microextraction-high-performance thin-layer chromatography for preconcentration and determination of phenolic compounds in aqueous samples

JPC - Journal of Planar Chromatography - Modern TLC, 2011

Research paper thumbnail of Quantitative ion-exchange TLC of <i>p</i> -hydroxybenzoic acid in the presence of preservatives

JPC - Journal of Planar Chromatography - Modern TLC, 2007

Research paper thumbnail of TLC quantification of methylparaben on an inorganic ion-exchanger in the presence of other food additives

JPC - Journal of Planar Chromatography - Modern TLC, 2007

ABSTRACT Rapid separation of methyl p-hydroxybenzoate from ethyl p-hydroxybenzoate, propyl p-hydr... more ABSTRACT Rapid separation of methyl p-hydroxybenzoate from ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, p-hydroxybenzoic acid, benzoic acid, sodium benzoate, butylated hydroxyanisole, and butylated hydroxytoluen e has been achieved by TLC on the inorganic ion-exchanger stannic silicate with n-hexane-ethyl methyl ketone-acetic acid, 8 + 2 + 0.3 (v/v), as mobile phase. The development distance was 12 cm and development time 30 min. Quantitative analysis of the separated methylparaben was performed by scanning densitometry at lambda = 260 nm. The limits of detection (LOD) and quantitation (LOQ) were 0.29 and 0.50 mu g per zone, respectively.

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