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415 results on '"Fakhari, Ali Reza"'

21. Magnetic solid-phase extraction based on fluconazole-functionalized Fe3O4@SiO2nanoparticles for the spectrophotometric determination of cationic dyes in environmental water samples

Author

Mirzaei, Fahimeh, Mohammadi Nilash, Mohammadreza, Sepahvand, Heshmatollah, Fakhari, Ali Reza, and Shaabani, Ahmad

Abstract

In the present study, a novel method based on fluconazole-functionalized magnetic silica nanoparticles as the adsorbent is introduced for the extraction of malachite green and crystal violet. The synthesized nanoparticles were characterized using SEM, EDX, XRD, FT-IR, and BET methods. The adsorbent were added to the sample solution containing 100.0 ng mL−1of each dye (pH 5.0); then, the mixture was agitated at room temperature for 20.0 min. The supernatant was poured, and then, the isolated nanoparticles were eluted with methanol to desorb the adsorbed dyes. Different parameters were investigated and optimized to achieve effective extraction and preconcentration of the target dyes. Limits of detection and limits of quantification for malachite green and crystal violet under optimum conditions changed in the range of 2.82–3.27 ng mL−1and 9.42–10.91 ng mL−1, respectively. Preconcentration factor and relative standard deviation for five repetitions of each dye were computed to be 188 and 4.77–4.17%, respectively. Finally, the mentioned dyes were extracted and determined using the proposed method from environmental aqueous samples. The recoveries range for malachite green and crystal violet were in 88–96%.

Published
2024
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22. Development of a new electromembrane extraction combined with ion mobility spectrometry for the quantification of malachite green in water samples

Author

Mirzaei, Fahimeh, Mohammadi Nilash, Mohammadreza, and Fakhari, Ali Reza

Abstract

In this study, a new method based on electromembrane extraction (EME) followed by corona discharge ion mobility spectrometry (CD-IMS) was used for preconcentration and quantification of malachite green in water samples. In the EME procedure, the charged malachite green migrated into the supported liquid membrane (SLM) under an applied potential. The extraction efficiency of malachite green was assessed based on two phase EME under effective parameters including applied voltage, extraction time, pH of the sample solution, stirring rate, and salt addition in the sample solution. The analytical performance of the developed EME method was studied under the optimum extraction condition. The dynamic linear range and low limit of detection of the EME method were 5–250 ng mL−1and 1.5 ng mL−1, respectively. The preconcentration factor of 150 and the RSD% of 3.8–7.6% were also achieved using EME method. Finally, the proposed method was successfully tested for the extraction and analysis of malachite green in different water samples.

Published
2024
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23. Enantioseparation and quantitative determination of ibuprofen using vancomycin-mediated capillary electrophoresis combined with molybdenum disulfide-assisted dispersive solid-phase extraction: optimization using experimental design

Author

Naghdi, Elahe, Fakhari, Ali Reza, and Ghasemi, Jahan B.

Abstract

A dispersive solid-phase extraction procedure using molybdenum disulfide as an adsorbent was developed for pretreatment and preconcentration of low quantity of ibuprofen in natural samples prior to enantioseparation. The chiral separation was carried out by vancomycin-mediated capillary electrophoresis coupled with UV detector. The effect of the main factors on the extraction recovery and enantioselective resolution was investigated using a central composite design. The best enantioseparation of ibuprofen was achieved on an uncoated capillary at 20 °C using phosphate buffer (pH 6.5) containing 1 mM vancomycin and 20 kV applied voltage. The optimum condition of the dispersive solid-phase extraction was obtained at the sample solution with pH 4.0 containing 1.4 M NaCl, 0.12 g adsorbent, 10 min adsorption time, 25 °C adsorption temperature, 1 mL the elution solvent (acetone-0.25 M NaOH (aq) (2:1 (v v−1)), 5 min desorption time, 50 °C desorption temperature, and the stirring speed of 900 rpm for adsorption and desorption steps. Good values of linearity range (0.125–5 µg mL−1, R2= 0.999), preconcentration factor (33.4), precision (less than 2.3%), and recovery (93.2%) were achieved. The limit of detection and quantification of, respectively, 0.025 and 0.070 μg mL−1was provided, which enabled a satisfactory trace determination of ibuprofen in urban water and human urine samples.

Published
2024
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