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Journal articles on the topic 'Solid phase extraction Liquid-liquid extraction 4'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Yang, Qin, Yuzhi Wang, Hongmei Zhang та ін. "The solid-phase extraction of α-chymotrypsin based on a novel porous polymeric dianionic ionic liquid-coated magnetic material". RSC Advances 7, № 84 (2017): 53203–9. http://dx.doi.org/10.1039/c7ra09434e.

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A novel magnetic solid-phase extraction (MSPE) method based on carboxymethylcellulose sodium modified Fe<sub>3</sub>O<sub>4</sub> nanocomposite coated with porous polymeric dianionic ionic liquid (Fe<sub>3</sub>O<sub>4</sub>@CMC@PPDIL) was proposed and applied to extracting α-chymotrypsin.

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Prokhorenko, D. K. "EVALUATION OF NUCLEIC ACID EXTRACTION METHODS FOR PATHOGEN DETECTION USING PCR." Biotechnologia Acta 18, no. 2 (2025): 86–88. https://doi.org/10.15407/biotech18.02.086.

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This work focuses on evaluating nucleic acid extraction methods and optimizing lysis buffer components to enhance nucleic acid yield and minimize the impact of potential inhibitors on target gene amplification to improve the detection of causative pathogens and facilitate their integration into diagnostic practice. Aim. To compare nucleic acid extraction methods from patient biological samples and to optimize lysis buffer composition to enhance nucleic acid yield. Methods. Spectrophotometric and fluorometric methods were used to assess the efficiency and quality of nucleic acid extraction. The

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Turki, Waleed. "Extraction of Manganese Element from Electric Arc Furnace Steel Slag (EAFS) by Liquid-liquid extraction (LLE) method." Journal of Engineering 28, no. 6 (2022): 39–52. http://dx.doi.org/10.31026/j.eng.2022.06.04.

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This research investigates manganese (Mn) extraction from Electric Arc Furnace Steel Slag (EAFS) by using the Liquid-liquid extraction (LLE) method. The chemical analysis was done on the slag using X-ray fluorescence, X-ray diffraction, and atomic absorption spectroscopy. This work consisted of two parts: the first was an extensive study of the effect of variables that can affect the leaching process rate for Mn element from slag (reaction time, nitric acid concentration, solid to liquid ratio, and stirring speed), and the second part evaluates the extraction of Mn element from leached solutio

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M. Harwood, Laurence, Jan John, Ashfaq Afsar, et al. "Extraction Properties of 4-Tetra(hydroxyphenyl)BTPhen in Liquid-Liquid Extraction Systems with Cyclohexanone/Octanol or in a Solid-Phase Extraction System." HETEROCYCLES 101, no. 1 (2020): 209. http://dx.doi.org/10.3987/com-19-s(f)14.

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Wang, Dao Wu, Xin Xia Feng, Xiao Long Li, and Long Zhang. "Solid-Phase Extraction of Salidroside by Electrospun Nanofibers." Advanced Materials Research 798-799 (September 2013): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.798-799.161.

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Abstract. The article established electrospun nanofibers as extraction medium to enrich and purify salidroside and detected the content changes by high performance liquid chromatography. 4 g polystyrene was dissolved in 20 mL butanone for spinning. The electrospun nanofibers was processed and loaded into solid extraction column. 3 mL sample was injected and eluted by 10 mL methanol at the speed of 2 mL/min, collecting the elution for the HPLC analysis. The results show that the relative content of solidroside increased from 24% to 55% and the extraction recovery was above 92%. The method is si

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Ali, M. Abd ALridha, and Tariq Zainab. "Development of dispersive liquid-liquid microextraction by coupling with magnetic nanoparticles for extraction and determi-nation of 4- Chlorophenol." Pak. J. Anal. Environ. Chem 23, Special Issue (2023): 231–36. https://doi.org/10.5281/zenodo.7855598.

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<strong>Abstract </strong>    Dispersive liquid-liquid micro extraction (DLLME) and magnatic-solid phase extraction (MSPE) are effective, quick, and easy extraction methods. Extraction and preconcentration of 4-Chlorophenol prior to spectrophotometric measurement has been enhanced using MSPE. Samples of 4-Chlorophenol were initially handled in this (DLLME).coupled (MSPE) technique. Lauric acid modified with Fe3O4 nanoparticles was employed to recover the analyte from the (DLLME) stage after acetone and 1-propanol were used as the dispersion and extraction solvents. Checks and adjustm

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Huang, Yanhua, Yuzhi Wang, Ying Wang, et al. "Ionic liquid-coated Fe3O4/APTES/graphene oxide nanocomposites: synthesis, characterization and evaluation in protein extraction processes." RSC Advances 6, no. 7 (2016): 5718–28. http://dx.doi.org/10.1039/c5ra22013k.

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A magnetic solid-phase extraction (MSPE) procedure with ionic liquid (IL) coated 3-aminopropyltriethoxysilane (APTES)-Fe<sub>3</sub>O<sub>4</sub> grafted graphene oxide (GO) nanocomposite (Fe<sub>3</sub>O<sub>4</sub>/APTES/GO/IL) as adsorbent has been developed for protein extraction.

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Baynes, Ronald E., and John M. Bowen. "Rapid Determination of Methyl Parathion and Methyl Paraoxon in Milk by Gas Chromatography with Solid-Phase Extraction and Flame Photometric Detection." Journal of AOAC INTERNATIONAL 78, no. 3 (1995): 812–14. http://dx.doi.org/10.1093/jaoac/78.3.812.

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Abstract Methyl parathion (MPT; O,O-dimethyl-O-4-nitro-phenyl phosphorothioate) and its active metabolite, methyl paraoxon (MPO; O, O-dimethyl-O-4-nitro-phenyl phosphate), were isolated from raw milk by solid-phase extraction (SPE) and determined by gas chromatography with flame photometric detection. The SPE method was compared with a traditional liquid-liquid extraction (LLE) procedure to determine whether SPE had suitable sensitivity and better efficiency in extracting MPT and MPO from milk of cows and goats. Method detection limits were higher for SPE, but the differences were not signific

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Zhao, X. S., W. J. Kong, S. Wang, J. H. Wei, and M. H. Yang. "Simultaneous analysis of multiple mycotoxins in Alpinia oxyphylla by UPLC-MS/MS." World Mycotoxin Journal 10, no. 1 (2017): 41–51. http://dx.doi.org/10.3920/wmj2016.2069.

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In this study, a reliable and fast method for the simultaneous quantitation of 11 mycotoxins in Alpinia oxyphylla was developed using ultra-performance liquid chromatography coupled with tandem mass spectrometry (UPLCMS/ MS). Three different extraction procedures (solid-liquid extraction, solid-phase extraction and modified QuEChERS) were evaluated. Solid-liquid extraction was fast and easy, and also provided the best recovery rate for all mycotoxins, compared to the other extraction procedures. Some crucial factors, including extraction solvent, time and temperature, were carefully optimised.

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Jiménez-Herrera, S., J. M. Ochando-Pulido, and A. Martínez-Ferez. "Comparison between different liquid-liquid and solid phase methods of extraction prior to the identification of the phenolic fraction present in olive oil washing wastewater from the two-phase olive oil extraction system." Grasas y Aceites 68, no. 3 (2017): 208. http://dx.doi.org/10.3989/gya.0225171.

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Phenolic compounds from olive mill wastewater (OMW), are characterized by a strong antioxidant activity. At the same time, they represent an environmental problem because they are difficult to degrade. The purpose of this work was to identify these biologically active compounds in the OMW from two-phase olive oil production in order to convert a polluting residue into a source of natural antioxidants. After optimizing the extraction process of phenolic compounds using liquid-liquid extraction (LLE) and solid phase extraction (SPE) methods, it was determined that the most appropriate sequence c

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Famiglini, Giorgio, Helga Trufelli, Elisabetta Pierini, Elisa De Simoni, Filippo Mangani, and Achille Cappiello. "Comparison of Solid-Phase Extraction and Micro-Solid-Phase Extraction for Liquid Chromatography/Mass Spectrometry Analysis of Pesticides in Water Samples." Journal of AOAC INTERNATIONAL 86, no. 5 (2003): 941–46. http://dx.doi.org/10.1093/jaoac/86.5.941.

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Abstract Our recent on-line solid-phase extraction (SPE) device for micro-liquid chromatography, known as micro-solid-phase extraction (μSPE), was compared with traditional SPE for the analysis, from aqueous samples, of 4 pesticides belonging to different classes. Two different kinds of adsorbents, C18 and graphitized carbon black, were tested. A 2-stage ion trap mass spectrometer, equipped with homemade microflow electrospray ion (ESI) source, was used. Detection limits with a signal-to-noise ratio of 3:1 for both extraction methods were in the range of 0.1 μg/L for all compounds. However, be

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Mazurek, Krzysztof, Katarzyna Białowicz, and Mieczysław Trypuć. "Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution." Polish Journal of Chemical Technology 12, no. 1 (2010): 23–28. http://dx.doi.org/10.2478/v10026-010-0005-2.

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Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution The paper presents the results of the research on the degree of the recovery of vanadium(V) from the used vanadium catalyst with the use of KOH solution. The extraction was performed at 293 - 323 K, for 0.5 to 4 h and the catalysts of the variable grain diameter. The concentration of the extracting solution was varied in the range 5 - 20%. The optimal ratio of solid to liquid phase S/L was determined. Additionally the degree of the recovery of total iron ions was presented.

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Maxwell, Tyler, Richard Blair, Yuemin Wang, et al. "A Solvent-Free Approach for Converting Cellulose Waste into Volatile Organic Compounds with Endophytic Fungi." Journal of Fungi 4, no. 3 (2018): 102. http://dx.doi.org/10.3390/jof4030102.

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Simple sugars produced from a solvent-free mechanocatalytic degradation of cellulose were evaluated for suitability as a growth medium carbon source for fungi that produce volatile organic compounds. An endophytic Hypoxylon sp. (CI-4) known to produce volatiles having potential value as fuels was initially evaluated. The growth was obtained on a medium containing the degraded cellulose as the sole carbon source, and the volatile compounds produced were largely the same as those produced from a conventional dextrose/starch diet. A second Hypoxylon sp. (BS15) was also characterized and shown to

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Ata, Şevket, Merve Berber, Hasan Çabuk, and Mehmet Akyüz. "Optimization of magnetic extraction by experimental design methodology for the determination of antidepressants in biological samples." Analytical Methods 7, no. 15 (2015): 6231–42. http://dx.doi.org/10.1039/c5ay01100k.

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In this study, a novel and sensitive magnetic solid phase extraction (MSPE) method based on Fe<sub>3</sub>O<sub>4</sub>–MgSiO<sub>3</sub> magnetic nanocomposites was developed for extraction and preconcentration of venlafaxine, escitalopram, paroxetine, sertraline and fluoxetine in biological samples followed by liquid chromatography-ultraviolet detection (LC-UV).

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Khalilian, Faezeh, Mohammad Rezaee, and Masoud Kashani Gorgabi. "Magnetic polypyrrole/Fe3O4particles as an effective sorbent for the extraction of abamectin from fruit juices using magnetic solid-phase extraction combined with dispersive liquid–liquid microextraction." Analytical Methods 7, no. 5 (2015): 2182–89. http://dx.doi.org/10.1039/c4ay03074e.

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Magnetic polypyrrole/Fe<sub>3</sub>O<sub>4</sub>nanoparticles were synthesized and employed as a novel sorbent for the magnetic solid-phase extraction of abamectin as an insecticide used in agriculture.

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Marney, Luke C., Thomas J. Laha, Geoffrey S. Baird, Petrie M. Rainey, and Andrew N. Hoofnagle. "Isopropanol Protein Precipitation for the Analysis of Plasma Free Metanephrines by Liquid Chromatography–Tandem Mass Spectrometry." Clinical Chemistry 54, no. 10 (2008): 1729–32. http://dx.doi.org/10.1373/clinchem.2008.104083.

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Abstract Background: High-performance liquid chromatography–tandem mass spectrometric (LC-MS/MS)1 analysis of plasma free metanephrines is the most diagnostically sensitive and specific screening test for the diagnosis of pheochromocytoma. We sought to develop an in-house method for this expensive test Methods: We used off-line isopropanol protein precipitation of plasma to remove interfering substances before LC-MS/MS analysis. We compared the extraction efficiency and limits of quantification of protein precipitation to those of previously reported solid-phase techniques. Results: The new me

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Gramse, Matthew J., Paul E. Jacobson, and James C. Selkirk. "Determination of Tylosin in Feeds by Liquid Chromatography with Solid-Phase Extraction." Journal of AOAC INTERNATIONAL 87, no. 2 (2004): 341–45. http://dx.doi.org/10.1093/jaoac/87.2.341.

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Abstract A method was developed for the determination of tylosin in feeds. The method involves extraction of tylosin with methanol, concentration under a stream of nitrogen, and cleanup using Phenomenex C18 solid-phase extraction cartridge. Analyte separation and quantitation were achieved by gradient reversed-phase liquid chromatography and UV absorbance at 285 nm with a reference wavelength of 320 nm with column temperature of 45°C. Average spike recoveries for samples prepared at 4 spiking levels (22.7, 181, 907, and 1000 g/ton) were 111.0, 94.9, 96.2, and 98.6%, respectively. The overall m

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Božović, Danica, Ivana Dimić, Nemanja Teslić, et al. "Valorization of Sour Cherry Kernels: Extraction of Polyphenols Using Natural Deep Eutectic Solvents (NADESs)." Molecules 29, no. 12 (2024): 2766. http://dx.doi.org/10.3390/molecules29122766.

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The objective of this research was to optimize the natural deep eutectic solvent (NADES) extraction process from sour cherry kernels (Prunus cerasus L.). For polyphenol isolation, conventional solid–liquid extraction was employed using different concentrations of ethanol (0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 96%), as well as the innovative NADES extraction technique. In the initial phase of the research, a screening of 10 different NADESs was conducted, while extraction was carried out under constant parameters (50 °C, 1:20 w/w, 60 min). NADES 4, composed of lactic acid and glucose in a

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Escamilla-Lara, Karen A., Ana C. Heredia, Araceli Peña-Alvarez, Israel S. Ibarra, Enrique Barrado, and Jose A. Rodriguez. "Magnetic Solid-Phase Extraction Based on Poly 4-Vinyl Pyridine for HPLC-FLD Analysis of Naproxen in Urine Samples." Molecules 25, no. 12 (2020): 2924. http://dx.doi.org/10.3390/molecules25122924.

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A magnetic solid phase extraction technique followed by liquid chromatography with a fluorescence detector for naproxen analysis in human urine samples was developed. The method includes the extraction of naproxen with a magnetic solid synthetized with magnetite and poly 4-vinylpriridine, followed by the magnetic separation of the solid phase and desorption of the analyte with methanol. Under optimal conditions, the linear range of the calibration curve was 0.05–0.60 μg L−1, with a limit of detection of 0.02 μg L−1. In all cases values of repeatability were lower than 5.0% with recoveries of 9

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Daryakenary, Maryam Ahmadi, and Mohsen Zeeb. "Trace determination of chlorpheniramine in human plasma using magnetic dispersive solid-phase extraction based on a graphene oxide/Fe3O4@polythionine nanocomposite combined with high-performance liquid chromatography." RSC Advances 7, no. 84 (2017): 53210–18. http://dx.doi.org/10.1039/c7ra09707g.

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Graphene oxide/Fe<sub>3</sub>O<sub>4</sub>@polythionine (GO/Fe<sub>3</sub>O<sub>4</sub>@PTh) nanocomposite was fabricated for magnetic dispersive solid-phase extraction and high-performance liquid chromatography-ultraviolent detection (HPLC) of chlorpheniramine in human plasma.

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Dong, Sheying, Guiqi Huang, Xiaohong Wang, Qing Hu, and Tinglin Huang. "Magnetically mixed hemimicelles solid-phase extraction based on ionic liquid-coated Fe3O4 nanoparticles for the analysis of trace organic contaminants in water." Anal. Methods 6, no. 17 (2014): 6783–88. http://dx.doi.org/10.1039/c4ay01185f.

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Magnetically mixed hemimicelles formed by ionic liquid-coated Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticles (IL-coated Fe<sub>3</sub>O<sub>4</sub> NPs) as an adsorbent of solid-phase extraction are proposed for the preconcentration of five organic contaminants.

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Fernández-Prior, África, Alejandra Bermúdez-Oria, Juan Fernández-Bolaños, Juan Antonio Espejo-Calvo, Francisco López-Maestro та Guillermo Rodríguez-Gutiérrez. "Evolution of Hydroxytyrosol, Hydroxytyrosol 4-β-d-Glucoside, 3,4-Dihydroxyphenylglycol and Tyrosol in Olive Oil Solid Waste or “Alperujo”". Molecules 27, № 23 (2022): 8380. http://dx.doi.org/10.3390/molecules27238380.

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The main by-product generated from the olive oil two-phase extraction system, or alperujo, is undoubtedly a rich source of bioactive components, among which phenolics are one of the most important. The evolution of four of its main phenolics: hydroxytyrosol (HT), hydroxytyrosol 4-β-d-glucoside (Glu-HT), 3,4-dihydroxyphenylglycol (DHPG) and tyrosol (Ty) was studied over two seasons and in ten oil mills under similar climatological and agronomic conditions, for the first time using organic extraction and high-performance liquid chromatography (HPLC-DAD) determination. The results show that HT (2

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Roybal, José E., Allen P. Pfenning, Sherri B. Turnipseed, Calvin C. Walker, and Jeffrey A. Hurlbut. "Determination of Four Fluoroquinolones in Milk by Liquid Chromatography." Journal of AOAC INTERNATIONAL 80, no. 5 (1997): 982–87. http://dx.doi.org/10.1093/jaoac/80.5.982.

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Abstract A liquid chromatographic (LC) method with fluorescence detection is presented for the analysis of 4 fluoroquinolones; enrofloxacin (ENRO), ciprofloxacin (CIPRO), sarafloxacin (SARA), and difloxacin (DIFLX) in milk. The procedure consists of extraction of milk with acidified ethanol, isolation and retention on a cation exchange solid-phase extraction column, elution with basic methanol, and LC analysis with fluorescence detection. LC analysis is performed by isocratic elution using an acetonitrile-2% acetic acid (15 + 85) mobile phase and an Inertsil phenyl column with fluorescence det

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Farajzadeh, Mir Ali, Adeleh Yadeghari, and Leila Khoshmaram. "Magnetic solid phase extraction using Fe3O4@SiO2@C8 nanoparticles performed in a narrow-bore tube followed by dispersive liquid–liquid microextraction for extraction and preconcentration of nine pesticides." New Journal of Chemistry 42, no. 8 (2018): 6215–24. http://dx.doi.org/10.1039/c8nj00501j.

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In the present work, a new magnetic solid phase extraction method performed in a narrow-bore tube using synthesized Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@C<sub>8</sub> magnetic nanoparticles has been developed.

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Hroboňová, Katarína, and Andrea Špačková. "Application of selective polymeric sorbents for simple coumarins extraction from deodorant samples." Acta Chimica Slovaca 13, no. 1 (2020): 56–62. http://dx.doi.org/10.2478/acs-2020-0009.

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AbstractCoumarins (2H-1-benzopyran-2-coumarin derivatives) are derivatives of cinnamic acid naturally occurring in many plants, fungi, and fruits. They are used as ingredients in cosmetics to enhance the aroma and other biological effects. In this work, cosmetic samples (deodorants) were treated by solid phase extraction prior to high performance liquid chromatography determination of coumarins. Traditional sorbent (C18) and selective polymer-based sorbents (laboratory prepared and commercial) were used for solid phase extraction. Recovery values were above 85 % (RSDs below 6 %) except for esc

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Li, Ying, Xiaoli Li, Xueyan Wang, et al. "Study on Extraction and Purification of Acanthopanax senticosus Polyphenols by an Ionic Liquid-Assisted Aqueous Two-Phase System." Molecules 28, no. 17 (2023): 6383. http://dx.doi.org/10.3390/molecules28176383.

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This study aimed to extract and purify polyphenols from Acanthopanax senticosus. A new green method was developed, in which ionic liquids (ILs) were used as aqueous two-phase (ATP) adjuvants to extract the polyphenols from A. senticosus. An ionic liquid-assisted aqueous two-phase system (IL-ATPS) was established. The purification of the polyphenols from the extraction fluid by AB-8 macroporous resin was conducted, and the kinetic mechanisms were studied. The reuse of ionic liquids was executed. The results showed that an [OMIM]Br-assisted ethanol/NaH2PO4 system (IL-ATPS) was the best extractio

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Jager, Lowri S. De, Gracia A. Perfetti, and Gregory W. Diachenko. "Liquid Chromatographic Determination of St. John's Wort Components in Functional Foods." Journal of AOAC INTERNATIONAL 87, no. 5 (2004): 1042–48. http://dx.doi.org/10.1093/jaoac/87.5.1042.

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Abstract A method was developed for determination of St. John's wort marker compounds hypericin, pseudohypericin, hyperforin, and adhyperforin in functional foods. Solid-phase extraction provided analyte extraction and significant sample cleanup prior to analysis using liquid chromatography (LC) with UV and fluorescence detection. In addition to quantification using LC-UV, confirmation was made with electrospray ionization LC mass spectrometry (LC/MS). Several commercially available tea and drink products claiming to contain St. John's wort were tested. Recoveries ranged from 51 to 98% for the

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Nikolic, Nada, Mihajlo Stankovic, and Milorad Cakic. "Solid-liquid systems for the hydrolysis of glycoalkaloids from potato (Solanum tuberosum L) tuber sprouts and solanidine isolation." Chemical Industry 57, no. 6 (2003): 288–92. http://dx.doi.org/10.2298/hemind0306288n.

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Solanidine (C17H43O/V) is a steroidal aglycone of glycoalkaloids and an important precursor for the synthesis of hormones and some pharmacologically active compounds. Glycoalkaloids are hydrolysed by mineral acid yielding solanidine and a carbohydrate moiety. In this paper the kinetics of hydrolysis of glycoalkaloids from potato (Solanum tuberosum L) tuber sprouts by using solid-liquid systems were studied as well as solanidine isolation from the liquid phase of the system. The dried and milled tuber sprouts of potato were used as the solid phase and solutions of hydrochloric acid of different

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Matějíček, David, Bořivoj Klejdus, and Vlastimil Kubáň. "Determination of Available Phenolic Compounds in Soils by Liquid Chromatography with Solid-Phase Extraction." Journal of AOAC INTERNATIONAL 85, no. 6 (2002): 1210–16. http://dx.doi.org/10.1093/jaoac/85.6.1210.

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Abstract A fast, selective, and sensitive liquid chromatographic (LC) method was developed for determination of derivatives of benzoic and cinnamic acids (gallic, protocatechuic, 2,3,4–trihydroxybenzoic, 4-hydroxybenzoic, vanillic, caffeic, syringic, 4-coumaric, ferulic, sinapic, benzoic, 2-coumaric, cinnamic acids, and 4-hydroxybenzaldehyde and vanillin) in soil samples. The method for sample pretreatment is based on temperature-controlled extraction with water (pH 5.6) for 60 min. Extracts were preconcentrated and purified by solid-phase extraction on OASIS HLB sorbent, with subsequent separ

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Li, Yongxin, Shuo Yin, Yi Yang, Jing Chen, Ling Wu, and Chengjun Sun. "Sample Treatment Methods for the Determination of Phenolic Environmental Estrogens in Foods and Drinking Water." Journal of AOAC INTERNATIONAL 103, no. 2 (2020): 348–64. http://dx.doi.org/10.5740/jaoacint.19-0249.

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Abstract Environmental endocrine-disrupting chemicals (EDCs) are a large category of chemicals that can disrupt normal endocrine functions of organisms. They can enter the environment and foodstuffs in different ways and bring great threat to human health. Phenolic environmental estrogens (PEEs) are the typical representatives of EDCs and include bisphenols, alkylphenols, and others such as dibromophenol, dichlorophenol, 4-nitrophenononylphenol, etc. Even trace amounts of PEEs can cause serious damage to the human reproductive, nervous, and immune systems; therefore, it is very important to de

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Arrahman, Arif, Rezi Riadhi Syahdi, Hana Permatasari, Intan Fikri Purnama Sari, and Abdul MunÍm. "EFFICACY OF IONIC LIQUID [MIM]BR-BASED MAE ON RESVERATROL AND PHENOLIC COMPOUNDS EXTRACTION FROM GNETUM GNEMON SEEDS AND THEIR DPP-4 INHIBITORY ACTIVITY." International Journal of Applied Pharmaceutics 10, no. 1 (2018): 168. http://dx.doi.org/10.22159/ijap.2018.v10s1.36.

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Objective: This study aimed to determine the inhibitory activity of 1-butyl-3-methylimidazolium bromide ([bmim]Br) extracts of melinjo seeds(Gnetum gnemon) on dipeptidyl peptidase-4 (DPP-4).Methods: Melinjo seeds were extracted by a [bmim]Br microwave-assisted method using various extraction parameters and the inhibitory activityof DPP-4 of all extracts was determined in 96-well microplates using Cayman inhibitor screening assay. Determination of trans-resveratrol contentwas conducted using a reverse-phase high-performance liquid chromatography method. The total phenolic content was determined

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Miao, Qiongchen, Jianmei Wang, Jing Nie, et al. "Magnetic dispersive solid-phase extraction based on a novel adsorbent for the detection of triazole pesticide residues in honey by HPLC-MS/MS." Analytical Methods 8, no. 26 (2016): 5296–303. http://dx.doi.org/10.1039/c6ay00376a.

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A novel Fe<sub>3</sub>O<sub>4</sub>@MDN (MDN) magnetic nanomaterial was successfully developed as a magnetic dispersive solid-phase extraction adsorbent for the determination of triazole pesticide residuals in honey samples by high performance liquid chromatography coupled with triple quadrupole mass spectrometry (HPLC-MS/MS).

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Gamón, Miguel, Adolfo Saez, Rosa Pelegrí, Inmaculada Peris, Josá G. De La Cuadra, and Ramón Coscollá. "Liquid Chromatographic Determination of Five Benzoylurea Insecticides in Fruit and Vegetables." Journal of AOAC INTERNATIONAL 81, no. 5 (1998): 1037–42. http://dx.doi.org/10.1093/jaoac/81.5.1037.

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Abstract A liquid chromatographic (LC) method was developed to determine 5 benzoyl ureas—diflubenzuron, hexaflumuron, teflubenzuron, flufenozuron, and lufenuron—in peppers, tomatoes, eggplants, cucumbers, and oranges. Preparation of samples involve extraction with acetone and partitioning into dichloromethane-petroleum ether. A portion of this extract is cleaned up with a solid-phase extraction aminopropyl disposable column. With LC analysis using an RP-8-DB microbore column, acetonitrilewater (70 + 30, v/v) as mobile phase, and photodiode array detection at 254 nm, recovery and repeatability

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Vi, Phung Thi, Truong Thi Kim, Le Thanh Huyen, Pham Hung Viet, and Duong Hong Anh. "Determination of perfluorinated compounds in Eichhornia crassipes (Mart.) Solms using LC-MS/MS in combination with sample preparation by ultrasound-assisted extraction and solid-phase extraction." Journal of Science and Technology 6, no. 4 (2024): 7. http://dx.doi.org/10.55401/jst.v6i4.2420.

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Fifteen perfluorinated compounds, including perfluorocarboxylic acids and perfluoroalkyl sulfonate salts (with 4 to 12 carbon atoms in their structure) in Eichhornia crassipes (Mart.) Solms samples underwent analysis using Liquid Chromatography- tandem Mass Spectrometry (LC-MS/MS). This analysis was conducted alongside sample preparation employing ultrasound-assisted extraction and solid-phase extraction. The optimization of solvent extraction involved the use of 5 ml of methyl tert-butyl ether (MTBE), 10 minutes of sonication, and three repeated extraction cycles. The weak anion exchange (WAX

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Phung Thi Vy, Truong Thi Kim, Le Thanh Huyen, Pham Hung Viet, and Duong Hong Anh. "Determination of perfluorinated compounds in Eichhornia crassipes (Mart.) Solms using LC-MS/MS in combination with sample preparation by ultrasound-assisted extraction and solid-phase extraction." Journal of Science and Technology 6, no. 4 (2024): 7. http://dx.doi.org/10.55401/rd9y5295.

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Fifteen perfluorinated compounds, including perfluorocarboxylic acids and perfluoroalkyl sulfonate salts (with 4 to 12 carbon atoms in their structure) in Eichhornia crassipes (Mart.) Solms samples underwent analysis using Liquid Chromatography- tandem Mass Spectrometry (LC-MS/MS). This analysis was conducted alongside sample preparation employing ultrasound-assisted extraction and solid-phase extraction. The optimization of solvent extraction involved the use of 5 ml of methyl tert-butyl ether (MTBE), 10 minutes of sonication, and three repeated extraction cycles. The weak anion exchange (WAX

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Mallinson, Edward T., A. Carolyn Henry, and Loyd Rowe. "Determination of Nitroimidazole Metabolites in Swine and Turkey Muscle by Liquid Chromatography." Journal of AOAC INTERNATIONAL 75, no. 5 (1992): 790–95. http://dx.doi.org/10.1093/jaoac/75.5.790.

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Abstract The method described can determine hydroxy dimetridazole and hydroxy ipronidazole in turkey and swine muscle tissue at levels of 2 ppb. After an initial extraction with ethyl acetate and subsequent evaporation, the samples are solvated in acid and back-extracted. A C18 solid-phase extraction is performed after neutralization of the acidic extract. The basis for quantitation was an external standard containing both analytes. After performing 10 recovery curves with blank control tissue spiked at 0, 1,2, and 4 ppb, the mean recoveries of hydroxy dimetridazole and hydroxy ipronidazole we

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Shahtaheri, S. J., M. Khadem, F. Golbabaei, and A. Rahimi-Froushani. "Solid Phase Extraction for Monitoring of Occupational Exposure to Cr (III)." Analytical Chemistry Insights 2 (January 2007): 117739010700200. http://dx.doi.org/10.4137/117739010700200014.

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Chromium is an important constituent widely used in different industrial processes for production of various synthetic materials. For evaluation of workers' exposure to trace toxic metal of Cr (III), environmental and biological monitoring are essential processes, in which, preparation of samples is one of the most time-consuming and error-prone aspects prior to analysis. The use of solid-phase extraction (SPE) has grown and is a fertile technique of sample preparation as it provides better results than those produced by liquid-liquid extraction (LLE). SPE using mini columns filled with XAD-4

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Krikunova, L. N., E. V. Ulyanova, S. M. Tomgorova, D. V. Andrievskaya, and V. A. Trofimchenko. "Development of identification criteria for fruit vodkas (Part 1. Sample preparation ways)." Food systems 5, no. 4 (2023): 298–307. http://dx.doi.org/10.21323/2618-9771-2022-5-4-298-307.

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The development of reliable identification criteria for various types of foods, including fruit vodkas, is one of the top-priority directions of scientific research in the field of quality control. The review examines different approaches to solution to a problem of searching identification criteria for fruit vodkas that will allow differentiating products by a type of fruit raw materials, their grade and region of origin. To this end, instrumental methods of analysis were used, including spectral, high performance liquid chromatography (HPLC) and gas chromatography coupled to mass spectrometr

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Aziz, Israa A., Moayyed G. Jalhoom, and Muhanad A. Kheriallah. "Extraction of Zirconium From Iraqi Bauxite Ore." Engineering and Technology Journal 38, no. 10A (2020): 1421–29. http://dx.doi.org/10.30684/etj.v38i10a.523.

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This research is devoted to the study of the extraction of zirconium from Iraqi Bauxite Ore by using hydrometallurgical method. The chemical analysis was done to the bauxite ore by using X-ray florescence, X-ray diffraction and atomic absorption spectroscopy. Zirconium Extraction was performed via three stages; the first stage is leaching of bauxite with sodium hydroxide for alumina leaching. The second stage is leaching of zirconium species from the remained powder produced from stage one after washing with deionized water and, nitric acid (HNO3 solutions). The results of the first stage has

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Dickson, Leslie C., James D. MacNeil, Stephen Lee та Adrian C. E. Fesser. "Determination of β-Agonist Residues in Bovine Urine Using Liquid Chromatography-Tandem Mass Spectrometry". Journal of AOAC INTERNATIONAL 88, № 1 (2005): 46–56. http://dx.doi.org/10.1093/jaoac/88.1.46.

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Abstract A multiresidue method was developed and validated to screen bovine urine samples for 10 β-2-adrenergic agonistic drugs—brombuterol, cimaterol, clenbuterol, clenpenterol, isoxsuprine, mabuterol, ractopamine, ritodrine, salbutamol, and tulobuterol—at the 2 μg/L level. The method is also quantitative in the range of 1 to 4 μg/L for all analytes except salbutamol. The procedure uses enzymatic digestion, liquid–liquid extraction, and cleanup on solid-phase extraction columns, followed by detection using a liquid chromatograph-tandem quadrupole mass spectrometer operated in the positive-ion

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Kowalski, Piotr, Natalia Hermann, Dagmara Kroll, Mariusz Belka, Tomasz Bączek, and Ilona Olędzka. "Signal Enhancement of Selected Norepinephrine Metabolites Extracted from Artificial Urine Samples by Capillary Electrophoretic Separation." International Journal of Molecular Sciences 25, no. 22 (2024): 12227. http://dx.doi.org/10.3390/ijms252212227.

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The measurement of selected norepinephrine metabolites, such as 3,4-dihydroxyphenylglycol (DHPG), 3-methoxy-4-hydroxyphenylethylenglycol (MHPG), and vanillylmandelic acid (VMA), in biological matrices—including urine—is of great clinical importance for the diagnosis and monitoring of diseases. This fact has forced researchers to evaluate new analytical methodologies for their isolation and preconcentration from biological samples. In this study, the three most popular extraction techniques—liquid-liquid extraction (LLE), solid-phase extraction (SPE), and a new 3D-printed system for dispersive

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Chen, Jing, Yuzhi Wang, Xueqin Ding, Yanhua Huang, and Kaijia Xu. "Magnetic solid-phase extraction of proteins based on hydroxy functional ionic liquid-modified magnetic nanoparticles." Anal. Methods 6, no. 20 (2014): 8358–67. http://dx.doi.org/10.1039/c4ay01786b.

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Hydroxy functional ionic liquids have been first designed and modified on the surface of silica-coated magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles (MNPs) for the investigation of the extraction performance of proteins.

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Chen, Hongping, Guanwei Gao, Pingxiang Liu, Rong Pan, Xin Liu, and Chengyin Lu. "Determination of 16 Polycyclic Aromatic Hydrocarbons in Tea by Simultaneous Dispersive Solid-Phase Extraction and Liquid–Liquid Extraction Coupled with gas Chromatography–Tandem Mass Spectrometry." Food Analytical Methods 9, no. 8 (2016): 2374–84. http://dx.doi.org/10.1007/s12161-016-0427-4.

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Rice, Larry G., P. Frank Ross, Jan Dejong, Ronald D. Plattner, and Joel R. Coats. "Evaluation of a Liquid Chromatographic Method for the Determination of Fumonisins in Corn, Poultry Feed, and Fusarium Culture Material." Journal of AOAC INTERNATIONAL 78, no. 4 (1995): 1002–9. http://dx.doi.org/10.1093/jaoac/78.4.1002.

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Abstract The performance of a liquid chromatographic method for determining fumonisins in corn, animal feeds, and culture material was evaluated. Efficiencies of extractions with the following solvent systems were determined: acetonitrile–water (50 + 50, v/v), methanol–water (75 + 25, v/v), and 100% water. The acetonitrile solvent gave both higher extraction efficiencies and faster extraction times than the other 2 solvents. Extraction was followed by C18 solid-phase extraction column cleanup. Fumonisin B1 (FB1), fumonisin B2 (FB2), and fumonisin B3 (FB3) were measured by precolumn derivatizat

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van der Horst, A., P. N. F. C. de Goede, H. A. M. van Diemen, C. H. Polman, and H. J. M. Martens. "Determination of 4-aminopyridine in serum by solid-phase extraction and high-performance liquid chromatography." Journal of Chromatography B: Biomedical Sciences and Applications 574, no. 1 (1992): 166–69. http://dx.doi.org/10.1016/0378-4347(92)80114-6.

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Liu, Hanjiu, Hamid Davoudi, and Thomas Last. "Determination of Amphotericin B in cerebrospinal fluid by solid-phase extraction and liquid chromatography." Journal of Pharmaceutical and Biomedical Analysis 13, no. 11 (1995): 1395–400. http://dx.doi.org/10.1016/0731-7085(95)01566-4.

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Smith, C. S., S. L. Morgan, S. V. Greene, and R. K. Abramson. "Solid-phase extraction and high-performance liquid chromatographic method for chlorpromazine and thirteen metabolites." Journal of Chromatography B: Biomedical Sciences and Applications 423 (January 1987): 207–16. http://dx.doi.org/10.1016/0378-4347(87)80344-4.

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Mashile, Geaneth Pertunia, Anele Mpupa та Philiswa Nosizo Nomngongo. "Magnetic Mesoporous Carbon/β-Cyclodextrin–Chitosan Nanocomposite for Extraction and Preconcentration of Multi-Class Emerging Contaminant Residues in Environmental Samples". Nanomaterials 11, № 2 (2021): 540. http://dx.doi.org/10.3390/nano11020540.

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This study reports the development of magnetic solid-phase extraction combined with high-performance liquid chromatography for the determination of ten trace amounts of emerging contaminants (fluoroquinolone antibiotics, parabens, anticonvulsants and β-blockers) in water systems. Magnetic mesoporous carbon/β-cyclodextrin–chitosan (MMPC/Cyc-Chit) was used as an adsorbent in dispersive magnetic solid-phase extraction (DMSPE). The magnetic solid-phase extraction method was optimized using central composite design. Under the optimum conditions, the limits of detection (LODs) ranged from 0.1 to 0.7

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Liu, Bangfu, and Zhijian Tan. "Separation and Purification of Astragalus membranaceus Polysaccharides by Deep Eutectic Solvents-Based Aqueous Two-Phase System." Molecules 27, no. 16 (2022): 5288. http://dx.doi.org/10.3390/molecules27165288.

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(1) Background: Aqueous two-phase systems (ATPSs) have been widely used in the separation and purification of bioactive substances in recent years. (2) Methods: In this study, deep eutectic solvents (DESs)-based ATPSs were employed for the extraction and separation of Astragalus membranaceus polysaccharides (AMP). The optimal DES (choline chloride:urea = 1:1) was first screened to extract AMP, and the effect of DES concentration, solid–liquid ratio, pH, extraction temperature, and extraction time on the extraction yield of AMP were investigated. (3) Results: The maximum extraction yield was 14

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Anastassiades, Michelangelo, Steven J. Lehotay, Darinka Štajnbaher, and Frank J. Schenck. "Fast and Easy Multiresidue Method Employing Acetonitrile Extraction/Partitioning and “Dispersive Solid-Phase Extraction” for the Determination of Pesticide Residues in Produce." Journal of AOAC INTERNATIONAL 86, no. 2 (2003): 412–31. http://dx.doi.org/10.1093/jaoac/86.2.412.

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Abstract A simple, fast, and inexpensive method for the determination of pesticide residues in fruits and vegetables is introduced. The procedure involves initial single-phase extraction of 10 g sample with 10 mL acetonitrile, followed by liquid–liquid partitioning formed by addition of 4 g anhydrous MgSO4 plus 1 g NaCl. Removal of residual water and cleanup are performed simultaneously by using a rapid procedure called dispersive solid-phase extraction (dispersive-SPE), in which 150 mg anhydrous MgSO4 and 25 mg primary secondary amine (PSA) sorbent are simply mixed with 1 mL acetonitrile extr

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