Temat: Solid phase extraction

Skocz do pozycji: 1.

Tytuł:: Nanoadsorbents for the preconcentration of some toxic substances : a minireview
Autorzy:: Kaur, A.
Saini, S. S.
Tematy:: Solid phase extraction
preconcentration
trace analytes; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/411821.pdf Link otwiera się w nowym oknie
Opis:: The development of new sorbents and their application in preconcentration methods for determination of trace analytes is subject of great interest. Sample pretreatment methods, such as separation / preconcentration prior to the determination of metal ions have developed rapidly due to the increasing need for accurate and precise measurements at extremely low levels of ions in diverse matrices. This review summarizes and discusses several analytical methods involving the preparation and use of new solid phase extractant. A literature survey of the last ten years offering a critical review of these new sorbents available for use in trace analyte enrichment is provided.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Rapid, sensitive and accurate method for determination of Lafutidine hydrochloride in human plasma by RP-HPLC system
Autorzy:: Vekariya, P. P.
Joshi, H. S.
Tematy:: HPLC-PDA
Human plasma
Solid phase Extraction; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/412425.pdf Link otwiera się w nowym oknie
Opis:: Simple and rapid reverse phase high-performance liquid chromatography (RP-HPLC) method was developed and validated using Phenomenex Gemini c18 (4.6 x 250 mm, 5 μ) reverse phase column for the determination of LAF in human plasma, Solid Phase Extraction (SPE) technique was used for the extraction of analyte, detection was carried out by Photo Diode Array detector at 216 nm. Chromatographic resolution of the LAF was achieved within 4.6 min by using mobile phase Methanol and 5 mM Di-Potassium Hydrogen Phosphate Buffer (pH 9.5) (80:20, v/v), flow rate was 1.0 mL/min. Calibration curve was linear with correlation coefficient of 0.9996 in the range of 50-1000 ng/mL, Limit of Detection (LOD) and Limit of Quantitation (LOQ) were 10 ng/mL and 30 ng/mL respectively, intra and inter-day deviations were lower than 3.92 % and 3.98 % respectively. The overall mean recovery of LAF was 94.57 %. No any endogenous constituents were found to interfere at retention time of the analyte. This new RP-HPLC method was successfully validated and may be applied to conduct bioavailability & bioequivalence studies of LAF.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Adsorption efficiency of pentafluorobenzene on ionic liquids-based silicas
Autorzy:: Wang, X.
Lin, L.
Xie, J.
Yan, X.
Xiao, W.
Tian, P.
Tematy:: ionic liquids based silica
pentafl uorobenzene
adsorption
solid-phase extraction; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778559.pdf Link otwiera się w nowym oknie
Opis:: The adsorption of pentafl uorobenzene on nine ionic liquid-based silicas was investigated using solid phase extraction. The effects of several variables such as the type of ionic liquid groups, adsorption time, temperatures and water ratio in the solution system were experimentally evaluated. The imidazole-chloride ionic liquid group based silica exhibited the highest adsorption efficiency under the optimized conditions of 5 min adsorption at 30°C in water/methanol (30:70, vol%) solution. In addition, the effects of pH, as well as type and concentrations of chloride salts were investigated. At pH values other than neutral and high salt concentration, the adsorption efficiency was reduced. Finally, the relative standard deviation of less than 5.8% over a 5-day period showed a high precision for the nine tested sorbents.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Determination of trace quantities of dutasteride in water and wastewater by solid phase extraction and high-performance liquid chromatography
Autorzy:: Wasilewska, A.
Madajczyk, M.
Szymański, A.
Urbaniak, W.
Tematy:: dutasteride
emerging pollutants
solid-phase extraction (SPE)
liquid chromatography
HPLC; Pokaż więcej
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Powiązania:: https://bibliotekanauki.pl/articles/347041.pdf Link otwiera się w nowym oknie
Opis:: Steroid compounds are a kind of pollutants which are increasingly more frequently found in environmental samples. Due to the ever more increasing level of such pollutants and their biological activity, they are of interest to analysts. Our study involved the development of a simple and fast method for the assay of dutasteride in treated industrial waste water using high-performance liquid chromatography. As the steroid concentration in water is much lower than the limit of detection of the UV detector used, the compound assayed in the test water was pre-concentrated using solid-phase extraction. Our procedure has high accuracy and a precision of 2.6%, and the recovery of the analyte from water is 78.6%. The procedure enables the assay of dutasteride at a level of 2 microg/L in water.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Micro-solid phase extraction with in-lab-packed columns for cost-efficient drug extraction from urine samples
Autorzy:: Chromiec, Alicja
Wietecha-Posłuszny, Renata
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Sample Preparation Followed by High Performance Liquid Chromatographic (HPLC) Analysis for Monitoring Muconic Acid as a Biomarker of Occupational Exposure to Benzene
Autorzy:: Shahtaheri, S. J.
Ghamari, F.
Golbabaei, F.
Rahimi-Froushani, A.
Abdollahi, M.
Tematy:: benzene
muconic acid
sample preparation
solid-phase extraction
biological monitoring
chromatography; Pokaż więcej
Wydawca:: Centralny Instytut Ochrony Pracy
Powiązania:: https://bibliotekanauki.pl/articles/91059.pdf Link otwiera się w nowym oknie
Opis:: Factors affecting solid phase extraction (SPE) of trans,trans-muconic acid (ttMA), as a benzene biomarker, including sample pH, sample concentration, sample volume, sample flow rate, washing solvent, elution solvent, and type of sorbent were evaluated. Extracted samples were determined by HPLC-UV (high performance liquid chromatography-ultraviolet). The analytical column was C18, UV wave length was 259 nm, and the mobile phase was H2O/methanol/acetic acid run at flow rate of 1 ml/min. A strong anion exchange silica cartridge was found successful in simplifying SPE. There was a significant difference between recoveries of ttMA when different factors were used (p < .001). An optimum recovery was obtained when sample pH was adjusted at 7. There was no significant difference when different sample concentrations were used (p > .05). The optimized method was then validated with 3 different pools of samples showing good reproducibility over 6 consecutive days and 6 within-day experiments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Chemical modification of silica surface by bonding ketoimine groups for SPE
Autorzy:: Rykowska, I.
Wasik, W.
Tematy:: chemically bonded phases
silica gel
solid-phase extraction (SPE)
gas chromatography; Pokaż więcej
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Powiązania:: https://bibliotekanauki.pl/articles/346937.pdf Link otwiera się w nowym oknie
Opis:: The applicability of silica gels, modified with ketoimine groups, in solid-phase extraction was tested. The surface characteristics of the modified silica was determined by elemental analysis, NMR spectra for the solid phases (29Si CP MAS NMR), analysis of pore size distribution of the silica support, and nitrogen adsorptiondesorption. The newly proposed sorbents with ketoimine groups were used for extraction of endocrine-disruptor compounds, extracted from water and powder milk. The properties of the sorbents were compared with commercial C18 ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Study of SPE conditions for CE determination of tricyclic antidepressants in body fluids
Autorzy:: Kochana, Jolanta
Madej, Katarzyna
Woźniakiewicz, Michał
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: SPE-TLC profiling of impurities in 1-(3,4-methylenedioxyphenyl)-2-nitropropene, an intermediate in 3,4-methylenedioxy- methamphetamine (MDMA) synthesis
Autorzy:: Kochana, Jolanta
Parczewski, Andrzej
Wilamowski, Jarosław
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: UV-Vis spectroscopic detection coupled with chemometrics for the measurement of mixed organic acids in water samples enriched by radial electric focusing solid phase extraction
Autorzy:: Guo, Y.
Liu, X.
Liu, J.
Bian, X.
Zhang, Q.
Pan, J.
Wan, D.
Tematy:: chemometrics
UV-Vis spectrophotometer
radial electric focusing solid phase extraction
mixed organic acids; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221808.pdf Link otwiera się w nowym oknie
Opis:: Due to the difficulty of detecting traces of organic acid mixture in an aqueous sample and the complexity of resolving UV-Vis spectra effectively, a combinatory method based on a self-made radical electric focusing solid phase extraction (REFSPE) device, UV-Vis detection and partial least squares (PLS) calculation is proposed here. In this study, REFSPE was used to enhance the extraction process of analytes between the aqueous phase and the membrane phase to enrich the trace of mixed organic acid efficiently. Then, the analytes, which were eluted from the adsorption film by ethanol with the assistance of an ultrasonic cleaning machine, were detected with UV-Vis spectrophotometry. After that, the PLS method was introduced to solve the problem of overlapping peaks in UV-Vis spectra of mixed substances and to quantify each compound. The linearly dependent coefficients between the predicted value of the model and the actual concentration of the sample were all higher than 0.99. The limit values of detection for benzoic acid, phthalic acid and p-toluene sulfonic acid were found at 9.9 μg/L, 12.2 μg/L and 13.8 μg/L with the relative recovery values between 84.8% and 117.9%. The RSD (n = 20) values of each component are 1.17%, 1.11% and 0.86%, respectively. Therefore, the proposed combined method can determine traces of complex materials in an aqueous sample efficiently and has wonderful potential applications.
Dostawca treści:: Biblioteka Nauki

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