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Thematische Bibliographien / Extraction en phase solide – Purification / Zeitschriftenartikel

Zeitschriftenartikel zum Thema „Extraction en phase solide – Purification“

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Veröffentlicht am 22. Juni 2024

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1

Lüdicke, Malín G., Jana Hildebrandt, Christoph Schindler, Ralph A. Sperling und Michael Maskos. „Automated Quantum Dots Purification via Solid Phase Extraction“. Nanomaterials 12, Nr. 12 (09.06.2022): 1983. http://dx.doi.org/10.3390/nano12121983.

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The separation of colloidal nanocrystals from their original synthesis medium is an essential process step towards their application, however, the costs on a preparative scale are still a constraint. A new combination of approaches for the purification of hydrophobic Quantum Dots is presented, resulting in an efficient scalable process in regard to time and solvent consumption, using common laboratory equipment and low-cost materials. The procedure is based on a combination of solvent-induced adhesion and solid phase extraction. The platform allows the transition from manual handling towards automation, yielding an overall purification performance similar to one conventional batch precipitation/centrifugation step, which was investigated by thermogravimetry and gas chromatography. The distinct miscibility gaps between surfactants used as nanoparticle capping agents, original and extraction medium are clarified by their phase diagrams, which confirmed the outcome of the flow chemistry process. Furthermore, the solubility behavior of the Quantum Dots is put into context with the Hansen solubility parameters framework to reasonably decide upon appropriate solvent types.

2

Topçu, Aykut Arif, Süleyman Aşır und Deniz Türkmen. „DNA Purification by Solid Phase Extraction (SPE) Methods“. Hacettepe Journal of Biology and Chemistry 3, Nr. 44 (01.07.2016): 259. http://dx.doi.org/10.15671/hjbc.20164420568.

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3

McCormick, Randy M. „A solid-phase extraction procedure for DNA purification“. Analytical Biochemistry 181, Nr. 1 (August 1989): 66–74. http://dx.doi.org/10.1016/0003-2697(89)90394-1.

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4

Egbers, Philipp H., Tilmann Harder, Boris P. Koch und Jan Tebben. „Siderophore purification with titanium dioxide nanoparticle solid phase extraction“. Analyst 145, Nr. 22 (2020): 7303–11. http://dx.doi.org/10.1039/d0an00949k.

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The study of bacterial metal chelators, so called siderophores, requires robust analytical methods that selectively target and extract strong iron-binding compounds from complex samples containing a plethora of organic molecules.

5

Rolčík, Jakub, Jana Řečinská, Petr Barták, Miroslav Strnad und Els Prinsen. „Purification of 3-indolylacetic acid by solid phase extraction“. Journal of Separation Science 28, Nr. 12 (August 2005): 1370–74. http://dx.doi.org/10.1002/jssc.200500189.

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6

Cruz-Villalon, Gregorio. „Synthesis of Allicin and Purification by Solid-Phase Extraction“. Analytical Biochemistry 290, Nr. 2 (März 2001): 376–78. http://dx.doi.org/10.1006/abio.2001.4990.

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7

Cruz-Villalon, Gregorio. „Synthesis of Allicin and Purification by Solid-Phase Extraction“. Analytical Biochemistry 304, Nr. 2 (Mai 2002): 274. http://dx.doi.org/10.1006/abio.2002.5610.

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8

Xu, Sijie, Junxia Wang, Dengxian Deng, Yueying Sun, Xuedong Wang und Zhanen Zhang. „A pretreatment method combined matrix solid-phase dispersion with dispersive liquid–liquid micro-extraction for polybrominated diphenyl ethers in vegetables through quantitation of gas chromatography-tandem mass spectrometry (GC-MS)“. RSC Advances 13, Nr. 23 (2023): 15772–82. http://dx.doi.org/10.1039/d3ra00320e.

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Herein, a novel pretreatment method for extraction of polybrominated diphenyl ethers (PBDEs) using matrix solid phase dispersion (MSPD) and depth purification using dispersive liquid–liquid micro-extraction (DLLME) from vegetables was designed.

9

Liu, Wei, Du Shu Huang, Na Wu, Ju Cheng Zhang, Ping Yi und Jin Yang. „Determination of Organochlorine Pesticides in Saussurea Costus by Ultrasonic Extraction and Solid-Phase Microextraction Method“. Advanced Materials Research 554-556 (Juli 2012): 1947–51. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.1947.

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Ultrasonic extraction and purification using solid-phase microextraction column for the determination of 7 types of organochlorine pesticides including α, β, γ, δ-BHC, 2,4 '-DDT, 4,4'-DDT and heptachlor from the Saussrrea cotus were investigated in this study. The pretreatment of Saussrrea cotus samples, the effect of different ultrasonic time on the extraction efficiency and the effect of different ratio of dichloromethane: petroleum ether on purification efficiency were studied. Results show that the satisfactory extraction conditions for pre-treatment process are: 30 minutes ultrasonic treatment; the volume ratio of dichloromethane and petroleum ether mixture is 3:7.

10

Poling, Stephen M., und Ronald D. Plattner. „Rapid Purification of Fumonisins B3and B4with Solid Phase Extraction Columns“. Journal of Agricultural and Food Chemistry 44, Nr. 9 (Januar 1996): 2792–96. http://dx.doi.org/10.1021/jf960013p.

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11

Ma, Paul, Nicholas Kanizaj, Shu-Ann Chan, David L. Ollis und Malcolm D. McLeod. „The Escherichia coli glucuronylsynthase promoted synthesis of steroid glucuronides: improved practicality and broader scope“. Org. Biomol. Chem. 12, Nr. 32 (2014): 6208–14. http://dx.doi.org/10.1039/c4ob00984c.

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12

Koutsioukis, Apostolos, Antonios Akouros, Radek Zboril und Vasilios Georgakilas. „Solid phase extraction for the purification of violet, blue, green and yellow emitting carbon dots“. Nanoscale 10, Nr. 24 (2018): 11293–96. http://dx.doi.org/10.1039/c8nr03668c.

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13

J, Jonathan, Veren Tania, Jessica C. Tanjaya und Katherine K. „Recent Advancements of Fungal Xylanase Upstream Production and Downstream Processing“. Indonesian Journal of Life Sciences | ISSN: 2656-0682 (online) 3, Nr. 1 (30.09.2021): 37–58. http://dx.doi.org/10.54250/ijls.v3i1.122.

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Xylanase is a hydrolytic enzyme produced by fungi and bacteria utilized in various industrial applications such as food, biobleaching, animal feed, and pharmaceuticals. Due to its wide variety of applications, xylanase's large-scale industrial production has gained researchers' interest. Many factors and methods affect fungal xylanase's production in both upstream and downstream processing stages. The upstream production methods used are submerged fermentation (SmF) and solid-state fermentation (SSF), where SmF involves the usage of liquid substrates, while the SSF applies solid substrates to inoculate the microbes. The downstream processing of fungal xylanase includes extraction, purification, and formulation. The extraction methods used to extract fungal xylanase are filtration and solvent extraction. Meanwhile, the purification methods include ultrafiltration, precipitation, chromatography, Aqueous Two-Phase System (ATPS), and Aqueous Two-Phase Affinity Partitioning (ATPAP). The formulation of xylanase product is obtained in either liquid from the extraction-purification results, which can be converted to powder form using technologies such as spray drying to increase storage life. Moreover, immobilization of xylanase with nanoparticles of SiO2 could produce reusable xylanase enzymes. Several future studies have also been suggested. This review aims to explain the upstream and downstream processes of fungal xylanase production as well as the factors that affect those processes.

14

Dziurkowska, Ewelina, und Marek Wesolowski. „Solid Phase Extraction Purification of Saliva Samples for Antipsychotic Drug Quantitation“. Molecules 23, Nr. 11 (12.11.2018): 2946. http://dx.doi.org/10.3390/molecules23112946.

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Saliva is far less popular as a diagnostic material than blood. This has resulted in a lack of procedures for the sampling and handling of saliva, e.g., effective ways to purify endogenous compounds from saliva to enable a simultaneous determination of xenobiotics such as neuroleptics. Therefore, the aim of this study was to develop an analytical procedure to purify saliva samples so that it is then possible to simultaneously determine five neuroleptics (aripiprazole, clozapine, olanzapine, quetiapine and risperidone) and the antiepileptic drug carbamazepine, and their respective metabolites (dehydroaripiprazole, N-desmethylclozapine, N-demethylolanzapine, norquetiapine, 9-OH-risperidone and carbamazepine-10,11-epoxide). A study of three types of solid-phase extraction (SPE) columns showed that the purest eluates were obtained using columns containing ion exchange sorbent. The sorbents were first washed with water then with a mixture of water and methanol (1:1), and the adsorbed residue was eluted with a 5% ammonia solution in methanol. Saliva samples for SPE were diluted with 2% formic acid and a mixture of methanol and water (1:1). This procedure was developed to purify a saliva sample spiked with a mixture of neuroleptics and carbamazepine, and their respective metabolites. A chromatographic analysis confirmed the isolation of all compounds, indicating that this procedure can be used in further development and validation for a method designed to monitor the levels of neuroleptic drugs in saliva and to monitor their uptake by patients.

15

Han, Dandan, und Kyung Ho Row. „Separation and Purification of Sulforaphane from Broccoli by Solid Phase Extraction“. International Journal of Molecular Sciences 12, Nr. 3 (10.03.2011): 1854–61. http://dx.doi.org/10.3390/ijms12031854.

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16

ZHAO, Xiaoshu, Nazhen ZHANG, Min LIU, Fumei DENG und Minghuo WU. „Purification and preparation of silybin and isosilybin by solid phase extraction“. Chinese Journal of Chromatography 35, Nr. 1 (2017): 70. http://dx.doi.org/10.3724/sp.j.1123.2016.08046.

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17

Lee, Y. R., und K. H. Row. „Purification of Two Flavones from Chamaecyparis obtusa by Solid-Phase Extraction“. Asian Journal of Chemistry 26, Nr. 10 (2014): 2823–26. http://dx.doi.org/10.14233/ajchem.2014.15805.

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18

Zhang, Qiwei, Henghui Li, Xiaojun Feng, Bi-Feng Liu und Xin Liu. „Purification of Derivatized Oligosaccharides by Solid Phase Extraction for Glycomic Analysis“. PLoS ONE 9, Nr. 4 (04.04.2014): e94232. http://dx.doi.org/10.1371/journal.pone.0094232.

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19

Russell, James M., und Josef P. Werne. „The use of solid phase extraction columns in fatty acid purification“. Organic Geochemistry 38, Nr. 1 (Januar 2007): 48–51. http://dx.doi.org/10.1016/j.orggeochem.2006.09.003.

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20

Rojo, Jose A., und Edward G. Perkins. „Cyclic fatty acid monomer: Isolation and purification with solid phase extraction“. Journal of the American Oil Chemists' Society 66, Nr. 11 (November 1989): 1593–95. http://dx.doi.org/10.1007/bf02636183.

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21

Lin, Senyu, Yanping Xian, Zhiqing Xun, Siyan Li, Xinjia Liu, Weifeng Du, Jinfeng Huang, Xindong Guo und Hao Dong. „Solid-phase extraction coupled with ultra performance liquid chromatography tandem mass spectrometry to determine seven halogenated salicylanilides in cosmetics“. RSC Advances 6, Nr. 54 (2016): 49011–18. http://dx.doi.org/10.1039/c6ra07944j.

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A solid-phase extraction (SPE) purification coupled with ultra performance liquid chromatography tandem mass spectrometry (SPE-UPLC-MS/MS) method was developed for simultaneous determination of seven halogenated salicylanilides in cosmetics.

22

Cheng, He-Li, Feng-Lian Wang, Yong-Gang Zhao, Yun Zhang, Mi-Cong Jin und Yan Zhu. „Simultaneous determination of fifteen toxic alkaloids in meat dishes and vegetable dishes using double layer pipette tip magnetic dispersive solid phase extraction followed by UFLC-MS/MS“. Analytical Methods 10, Nr. 10 (2018): 1151–62. http://dx.doi.org/10.1039/c7ay02608k.

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A novel double layer pipette tip magnetic dispersive solid phase extraction based on polyamidoamine-functionalized magnetic carbon nanotubes was developed for the purification of fifteen toxic alkaloids in cooked food samples.

23

Zhou, Rong-Rong, Jian-Hua Huang, Dan He, Zi-Yang Yi, Di Zhao, Zhao Liu, Shui-Han Zhang und Lu-Qi Huang. „Green and Efficient Extraction of Polysaccharide and Ginsenoside from American Ginseng (Panax quinquefolius L.) by Deep Eutectic Solvent Extraction and Aqueous Two-Phase System“. Molecules 27, Nr. 10 (13.05.2022): 3132. http://dx.doi.org/10.3390/molecules27103132.

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In this study, a green and effective extraction method was proposed to extract two main compounds, ginsenosides and polysaccharides, from American ginseng by combining deep eutectic solvents (DESs) with aqueous two-phase systems. The factors of type of DESs, water content in DESs, the solid–liquid ratio, extraction temperature, and extraction time were studied in the solid–liquid extraction. Then, the aqueous two-phase system (DESs-ethylene oxide–propylene oxide (EOPO)) and salty solution exchange (EOPO-salty solution) was applied for the purification of polysaccharides. The content of the polysaccharides and ginsenosides were analyzed by the anthrone–sulfuric acid method and HPLC method, which showed that the extraction efficiency of deep eutectic solvents (DESs) was better than conventional methods. Moreover, the antioxidant activities of ginseng polysaccharides and their cytotoxicity were further assayed. The advantages of the current study are that, throughout the whole extraction process, we avoided the usage of an organic reagent. Furthermore, the separated green solvent DESs and EOPO could be recovered and reused for a next cycle. Thus, this study proposed a new, green and recyclable extraction method for extracting ginsenosides and polysaccharides from American ginseng.

24

Cao, Xiang Ke, Qing Zeng Qian, Jun Wang Tong und Qian Wang. „Aquatic Products Determination of Nonylphenol and Octylphenol“. Applied Mechanics and Materials 340 (Juli 2013): 388–91. http://dx.doi.org/10.4028/www.scientific.net/amm.340.388.

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By solid - phase extraction high performance liquid chromatography determination of nonylphenol, Octylphenol in aquatic product residues, to establish more accurate, fast, effective detection method. Sample is 3 trichloroacetic acid solution after extraction, using anion exchange solid phase extraction column purification by reversed phase high performance liquid chromatography method for determination. Column is Shim-pack VP-ODS 250mm x4.6mm, detection wavelength is225 nm, mobile phase of methanol - water ( volume ratio of 75:25), flow rate is 0.8 mL/min, injection volume is 20 ìL. Octylphenol, nonylphenol respectively in 0.14¡«97.63 ìg/mL ( R=0.9995),0.02¡«51.04 ì g/mL ( R=0.9997) concentration and peak area show a good linear relationship, octylphenol nonylphenol and the recovery is 87.9%¡«93.8%, relative standard deviation is 1.4%¡«3.8%. Solid - phase extraction high performance liquid chromatography method for determination of aquatic product of octylphenol and nonylphenol residue is accurate, rapid, high sensitivity, suitable for aquatic products of octylphenol nonylphenol and detection.

25

Božinović, Marko, Renata Vičević, Nikolina Zekić, Anita Šalić, Ana Jurinjak Tušek und Bruno Zelić. „Intensification of endo-1,4-Xylanase Extraction by Coupling Microextractors and Aqueous Two-Phase System“. Processes 11, Nr. 2 (02.02.2023): 447. http://dx.doi.org/10.3390/pr11020447.

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The extraction of xylanase was performed using an aqueous two-phase system (ATPS) based on polyethylene glycol (PEG1540) and various salts. Preliminary studies in a batch extractor showed that the highest extraction efficiency, E = 79.63 ± 5.21%, and purification factor, PF = 1.26 ± 0.25, were obtained with sodium citrate dihydrate-H2O-PEG1540-based ATPS for an extraction time of 10 min. The process was optimized using the experimental Box-Behnken design at three levels with three factors: extraction time (t), xylanase concentration (γ), and mass fraction of PEG in the ATPS (wPEG). Under optimal process conditions (γ = 0.3 mg/mL, wPEG = 0.21 w/w, and t = 15 min), E = 99.13 ± 1.20% and PF = 6.49 ± 0.05 were achieved. In order to intensify the process, the extraction was performed continuously in microextractors at optimal process conditions. The influence of residence time, different feeding strategies, and channel diameter on extraction efficiency and purification factor was further examined. Similar results were obtained in the microextractor for a residence time of τ = 1.03 min (E = 99.59 ± 1.22% and PF = 6.61 ± 0.07) as in the experiment carried out under optimal conditions in the batch extractor. In addition, a batch extractor and a continuous microextractor were used for the extraction of raw xylanase produced by Thermomyces lanuginosus on solid supports.

26

Zuin, Vânia G., Vitaliy L. Budarin, Mario De bruyn, Peter S. Shuttleworth, Andrew J. Hunt, Camille Pluciennik, Aleksandra Borisova, Jennifer Dodson, Helen L. Parker und James H. Clark. „Polysaccharide-derived mesoporous materials (Starbon®) for sustainable separation of complex mixtures“. Faraday Discussions 202 (2017): 451–64. http://dx.doi.org/10.1039/c7fd00056a.

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The recovery and separation of high value and low volume extractives are a considerable challenge for the commercial realisation of zero-waste biorefineries. Using solid-phase extractions (SPE) based on sustainable sorbents is a promising method to enable efficient, green and selective separation of these complex extractive mixtures. Mesoporous carbonaceous solids derived from renewable polysaccharides are ideal stationary phases due to their tuneable functionality and surface structure. In this study, the structure–separation relationships of thirteen polysaccharide-derived mesoporous materials and two modified types as sorbents for ten naturally-occurring bioactive phenolic compounds were investigated. For the first time, a comprehensive statistical analysis of the key molecular and surface properties influencing the recovery of these species was carried out. The obtained results show the possibility of developing tailored materials for purification, separation or extraction, depending on the molecular composition of the analyte. The wide versatility and application span of these polysaccharide-derived mesoporous materials offer new sustainable and inexpensive alternatives to traditional silica-based stationary phases.

27

Meile, Kristine, und Aivars Zhurinsh. „Preparative Solid Phase Extraction for the Purification of Levoglucosan Obtained from Lignocellulose“. Key Engineering Materials 721 (Dezember 2016): 82–86. http://dx.doi.org/10.4028/www.scientific.net/kem.721.82.

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Automated preparative scale solid phase extraction (SPE) has been used to separate levoglucosan – a valuable platform chemical from the liquid products of wood pyrolysis. The sorbent for SPE was a strongly basic anion exchange resin in OH-form. Separation of levoglucosan could be done with water as the eluent, the regeneration of the resin was done with a NaCl solution. Up-scaling the purification of levoglucosan is a step forward industrial production of this chemical.

28

Shi, Wen Yu, Ping Lv, Tong Cun Zhang und Hong Zhu. „Research on Purifying Hypocrellin by Molecularly Imprinted Solid Phase Extraction (MISPE)“. Advanced Materials Research 1092-1093 (März 2015): 621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.621.

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Separation and purification of hypocrellin A (HA) and hypocrellin B (HB) are conducted for extracted concentrated solution of hypocrellin through dry packing of molecularly imprinted polymers (MIPs) of hypocrellin A and B and preparative solid phase extraction column. The result shows that the optimum packing column combination for mixed adsorption is H5 (i.e. MIP of hypocrellin A and B are respectively 10.5g and 4.5g), and that the elution sequence is hypocrellin A elution first and then hypocrellin B elution next after the eluent is changed.

29

Wianowska, Dorota. „Combination of Sea Sand Disruption Method and Ion-Pair Solid-Phase Extraction for Effective Isolation and Purification of Chlorogenic Acid from Plants Prior to the HPLC Determination“. Molecules 27, Nr. 17 (31.08.2022): 5601. http://dx.doi.org/10.3390/molecules27175601.

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Chlorogenic acid (CQA) is one of phenolics commonly found in higher plants, possessing numerous health-promoting effects on humans. Unfortunately, it is easily degraded/transformed into other substances during extraction. Therefore, its reliable analysis requires a special approach that does not involve high temperatures. This paper presents a very simple method of CQA isolation using the sea sand disruption method with subsequent purification of the extract using the ion-pair solid-phase extraction process, followed by HPLC–DAD detection. It was found that control of the ion pairing reagent concentration and sample pH is crucial to improve purification, and that the best results, with recovery exceeding 98%, were obtained for 0.05 M tetrabutylammonium bisulfate at pH 7 when the ion pairs were formed directly in the extract and eluted from the C18 sorbent using an acidified methanol–water mixture. The practical potential of the developed procedure was verified by using it for CQA isolation from different plants. The approach represents one of the contemporary analytical trends and current advances in the solid phase extraction, in which several sorption extraction techniques are combined to ensure high-quality analytical results.

30

Qiao, Lijun, Xiaohua Zhou, Yanhao Zhang, Ajuan Yu, Shusheng Zhang und Yangjie Wu. „Determination of trace sulfonamides in foodstuffs by HPLC using a novel mixed-mode functionalized ferrocene sorbent for solid-phase extraction cleanup“. Analytical Methods 8, Nr. 31 (2016): 6099–106. http://dx.doi.org/10.1039/c6ay01291d.

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In this paper, a rapid and effective HPLC method, using a new 4-chloro-6-pyrimidinylferrocene-modified silica gel (NFcSi) as a solid-phase extraction (SPE) sorbent, was developed for the purification and determination of trace sulfonamides in foodstuffs.

31

Vaulina, Daria, Morteza Nasirzadeh und Natalia Gomzina. „Automated radiosynthesis and purification of [ 18 F]flumazenil with solid phase extraction“. Applied Radiation and Isotopes 135 (Mai 2018): 110–14. http://dx.doi.org/10.1016/j.apradiso.2018.01.008.

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32

?olt�s, Ladislav, und Bernard S�bille. „Effective one/two step purification of various materials by solid-phase extraction“. Biomedical Chromatography 11, Nr. 6 (November 1997): 348–51. http://dx.doi.org/10.1002/(sici)1099-0801(199711)11:6<348::aid-bmc689>3.0.co;2-4.

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33

Hu, Guoqing, Jacky S. H. Lee und Dongqing Li. „A microfluidic fluorous solid-phase extraction chip for purification of amino acids“. Journal of Colloid and Interface Science 301, Nr. 2 (September 2006): 697–702. http://dx.doi.org/10.1016/j.jcis.2006.05.019.

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34

Gutierrez-Docio, Alba, Paula Almodóvar, Silvia Moreno-Fernandez, Jose Manuel Silvan, Adolfo J. Martinez-Rodriguez, Gonzalo Luis Alonso und Marin Prodanov. „Evaluation of an Integrated Ultrafiltration/Solid Phase Extraction Process for Purification of Oligomeric Grape Seed Procyanidins“. Membranes 10, Nr. 7 (09.07.2020): 147. http://dx.doi.org/10.3390/membranes10070147.

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The effectiveness of a preparative integrated ultrafiltration/solid-phase extraction (UF/SPE) process for purification of oligomeric procyanidins (OPCs) from a crude grape seed extract (GSE) was studied for the first time. The separation of OPCs from polymeric procyanidins (PPCs) by UF was very efficient. The membrane showed an acceptable filtration flux of 6 to 3.5 L/h·m2 at 0.5 bar of transmembrane pressure and 95% recovery of its water flux after chemical cleaning. The process was scalable to a pilot scale. The separation of very polar and ionic species from OPCs by SPE (XAD7HP and XAD16 resins) was also very good, but both adsorbents lost their retention capacities quickly, due probably to irreversible retention of OPCs/PPCs. Even though the global purification of OPCs by the integrated UF/SPE process allowed the recovery of 24.2 g of highly purified OPCs (83% purity) from 14.4 L of crude grape seed extract, the use of these adsorbents for further purification of the OPCs was very limited.

35

Liu, Bangfu, und Zhijian Tan. „Separation and Purification of Astragalus membranaceus Polysaccharides by Deep Eutectic Solvents-Based Aqueous Two-Phase System“. Molecules 27, Nr. 16 (19.08.2022): 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 141.11 mg/g under the optimum conditions. AMP was then preliminarily purified by ATPS, to further realize the recycling and reuse of DES. The effect of type of salts, salt concentration, and extraction temperature on extraction efficiency was investigated. The extraction efficiency was 97.85% for AMP under the optimum ATPS conditions. Finally, the obtained AMP was studied by molecular weight determination, infrared spectroscopy analysis, and monosaccharide composition analysis. (4) Conclusions: This ATPS extraction based on DESs is simple, environmentally friendly, low-cost, and has high extraction efficiency, which provides new ideas for the extraction of plant polysaccharides and other bioactive compounds.

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Cheng, Zhenyu, Haiyan Song, Yuewei Zhang, Dandan Han, Xue Yu, Qihui Shen und Fangli Zhong. „Concurrent Extraction and Purification of Gentiopicroside from Gentiana scabra Bunge Using Microwave-Assisted Ethanol-Salt Aqueous Two-Phase Systems“. Journal of Chromatographic Science 58, Nr. 1 (17.12.2019): 60–74. http://dx.doi.org/10.1093/chromsci/bmz101.

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Abstract A potential method called microwave-assisted aqueous two-phase extraction (MA-ATPE) was developed for concurrent extraction and purification of gentiopicroside from Gentiana scabra Bunge. Formation characteristics of aqueous two-phase system (ATPS) composed of ethanol and 25 kinds of salts were investigated; K2HPO4 (w/w, 21.71%) and ethanol (w/w, 40.72%) were determined to be the optimal compositions of ATPS. Response surface methodology based on Box–Behnken design was used to investigate the extraction conditions, the optimal parameters were summarized as follows: 80°C of extraction temperature, 31 s of extraction time, 11:1 (mL/g) of liquid-to-solid ratio, 100 meshes of particle size and 806 W of microwave power. Under these conditions, the extraction yield of gentiopicroside was 65.32 ± 0.24 mg/g with a recovery of 96.51%. Compared with other four methods, the purity of gentiopicroside in the crude extracts reached 17.16 ± 0.25%, which was significantly higher than that of smashing tissue extraction, microwave assisted-extraction, ultrasonic-assisted extraction and heat reflux extraction, respectively. In addition, the phase-forming salt can be recyclable. Therefore, MA-ATPE was an excellent and alternative technique to the conventional extraction approaches of gentiopicroside.

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Qi, Chen, Guo Tianyang, Yao Jian, Liao Renyi, Wu Peng, Wu Qiong, Jiang Shaotong und Dong Yiyang. „Microwave-Assisted Extraction Combined with Ultra-High-Performance Liquid Chromatography and Quadrupole/Q-Exactive High-Resolution Mass Spectrometry for the Determination of Main Flavor Substances in Green Tea“. Journal of AOAC INTERNATIONAL 103, Nr. 2 (März 2020): 428–32. http://dx.doi.org/10.5740/jaoacint.19-0265.

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Abstract Background: In order to make up for the efficacy of sensory assessment of green tea quality and taste, main flavor substances should be quantitatively characterized based on efficient extraction and frontier determination scheme. Methods: A new, relatively simple sample preparation and detection workflow has been developed for the quantification and confirmation of flavor substances in green tea by microwave-assisted extraction combined with ultra-high-performance LC and quadrupole/Q-Exactive high-resolution MS system. The method identified main flavor substances (i.e., catechins, free amino acids, and caffeine) that were the main components in the formation of tea taste. After crushing pretreatment, tea was extracted and purified simultaneously in a microwave extraction jar by matrix-dispersed solid-phase extraction. The extracting solution was determined by LC coupled to high-resolution Orbitrap mass spectrometry. Results: In this study, extraction solvent and purification materials were selected, extraction temperature and time were optimized, and the amount and proportion of solid-phase extraction packing were optimized. Conclusions: The method enabled detection of multiple catechins, amino acids, and caffeine in tea by LC coupled to high-resolution Orbitrap MS, and a database of tea flavor substances was established. Highlights: The method could be used for screening and confirmation of the main flavor substances in tea as well as assisting the sensory evaluation to grade the quality of tea.

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Bessonova, E. A., D. A. Karpitskii und L. A. Kartsova. „Modern Approaches to the Extraction and Preconcentration of Biologically Active Compounds from Plant Samples by Microextraction Methods for Their Determination by Chromatography–Mass Spectrometry“. Журнал аналитической химии 78, Nr. 10 (01.10.2023): 883–96. http://dx.doi.org/10.31857/s0044450223100031.

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The review considers the main trends in actively developing methods of solid-phase and liquid–liquid microextraction for the extraction, purification, and preconcentration of analytes from medicinal plants and plant materials, the use of new extractants and approaches to the preparation of samples of plant origin, and their compatibility with mass-spectrometric detection. Particular attention is paid to the analytical capabilities, advantages, and limitations of each of the approaches to extracting analytes from plant materials for the subsequent analysis of the obtained extracts by chromatography–mass spectrometry.

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Chen, Jing, Yuzhi Wang, Yanhua Huang, Kaijia Xu, Na Li, Qian Wen und Yigang Zhou. „Magnetic multiwall carbon nanotubes modified with dual hydroxy functional ionic liquid for the solid-phase extraction of protein“. Analyst 140, Nr. 10 (2015): 3474–83. http://dx.doi.org/10.1039/c5an00201j.

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A novel adsorbent based on silica-coated magnetic multiwall carbon nanotubes (MWCNTs) surface modified by dual hydroxy functional ionic liquid (FIL) ([OH]-FIL-m-MWCNTs@SiO₂) has been designed and used for the purification of lysozyme (Lys) by magnetic solid-phase extraction (MSPE).

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Zhu, Huaping, Shanshan Yang, Yan Zhang, Guozhen Fang und Shuo Wang. „Simultaneous detection of fifteen biogenic amines in animal derived products by HPLC-FLD with solid-phase extraction after derivatization with dansyl chloride“. Analytical Methods 8, Nr. 18 (2016): 3747–55. http://dx.doi.org/10.1039/c6ay00010j.

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Mandouma, Ghislain R., Ayunna Epps und John Barbas. „Synthesis of Substituted 2,2’-Dinitrobiphenyls by a Novel Solvent-Free High Yielding Ullmann Coupling Biarylation:“. International Journal for Innovation Education and Research 2, Nr. 12 (31.12.2014): 133–49. http://dx.doi.org/10.31686/ijier.vol2.iss12.293.

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Solvent-free reaction using a high-speed ball milling technique has been applied to the classical Ullmann coupling reaction for the first time. Biarylation of 2-iodonitrobenzene was achieved in quantitative yield when performed in a custom-made copper vial through continuous shaking without additional copper or solvent. The product was solid, NMR ready and required no lengthy extraction for purification. This reaction was cleaner, and faster than solution phase coupling which requires longer reaction time in high boiling solvents, added copper catalyst, and lengthy extraction and purification steps. Gram quantities of the biaryl compound were synthesized in larger copper vials. This is a general method that can be used to effectively reduce industrial waste en route to sustainability.

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Dobreva, Valentina, Boriana Zhekova und Georgi Dobrev. „Use of Aqueous Two-Phase and Three-Phase Partitioning Systems for Purification of Lipase Obtained in Solid-State Fermentation by Rhizopus arrhizus“. Open Biotechnology Journal 13, Nr. 1 (24.04.2019): 27–36. http://dx.doi.org/10.2174/1874070701913010027.

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Background: Purification of enzymes by conventional methods such as precipitation and chromatographic techniques is a costly and time-consuming procedure and may lead to low yields of enzyme activity. Alternative liquid-liquid extraction methods such as Aqueous Two-Phase Systems (ATPS) and Three Phase Partitioning (TPP) are characterized by the high enzyme yields and purification degree. Objective: The objective of this study was the application of partitioning systems ATPS and TPP for purification of lipase produced in solid-state fermentation by Rhizopus arrhizus. Methods: ATPS and TPP were used for purification of lipase, obtained by solid state cultivation of Rhizopus arrhizus. Results: Lipase was isolated with PEG4000/potassium sodium tartrate ATPS and the effect of the system composition, including PEG 4000 and potassium sodium tartrate concentrations on lipase partitioning was studied. When using 30% PEG4000/21% potassium sodium tartrate, lipase was distributed in the top phase, and the highest recovery yield of 217% and purification fold of 6.1 were achieved. It was found that at PEG4000 concentration of or higher than 15%, the enzyme was present in the top polymer-rich phase with a partitioning yield of over 90%. Upon application of TPP for lipase isolation, the effect of t-butanol concentration, ammonium sulfate concentration and pH on enzyme partitioning was investigated. The highest lipase recovery yield of 71% and 19.1-fold purification were achieved in the interfacial phase in the presence of 30% ammonium sulfate saturation with 1.0:0.5 crude extract/t-butanol ratio at pH 7 in a single step. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis and zymographic analysis showed significant purification of lipase by TPP and the presence of two multiple forms of the enzyme. Conclusion: ATPS (PEG4000/ Potassium sodium tartrate) and TPP (1.0:0.5 crude extract/t-butanol ratio, 30% ammonium sulfate saturation, pH 7) proved to be rapid methods for the isolation and purification of lipase and they can be used in downstream processing for industrial preparation of the enzyme.

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Oye Auke, Ruth, Guilhem Arrachart, Romain Tavernier, Ghislain David und Stéphane Pellet-Rostaing. „Terephthalaldehyde–Phenolic Resins as a Solid-Phase Extraction System for the Recovery of Rare-Earth Elements“. Polymers 14, Nr. 2 (13.01.2022): 311. http://dx.doi.org/10.3390/polym14020311.

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Rare-earth elements (REEs) are involved in most high technology devices and have become critical for many countries. The progress of processes for the extraction and recovery of REEs is therefore essential. Liquid–solid extraction methods are an attractive alternative to the conventional solvent extraction process used for the separation and/or purification of REEs. For this purpose, a solid-phase extraction system was investigated for the extraction and valorization of REEs. Ion-exchange resins were synthesized involving the condensation of terephthalaldehyde with resorcinol under alkaline conditions. The terephthalaldehyde, which is a non-hazardous aromatic dialdehyde, was used as an alternative to formaldehyde that is toxic and traditionally involved to prepare phenolic ion-exchange resins. The resulting formaldehyde-free resole-type phenolic resins were characterized and their ion-exchange capacity was investigated in regard to the extraction of rare-earth elements. We herein present a promising formaldehyde and phenol-free as a potential candidate for solid–liquid extraction REE with a capacity higher than 50 mg/g and the possibility to back-extract the REEs by a striping step using a 2 M HNO3 solution.

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DAI, Jinlan, Honglei YIN, Hang WEI, Lei ZHOU und Minghua LIU. „Determination of 24 Pesticides Residues in Leather Products by Solid-Phase Microextraction Coupled with Gas Chromatography–Mass Spectrometry“. Leather and Footwear Journal 20, Nr. 4 (15.12.2020): 385–404. http://dx.doi.org/10.24264/lfj.20.4.5.

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Considering the high content of oil and complex residual additives in leather samples, a new analytical method based on the solid-phase extraction technique and gas chromatography-selected ion monitoring mass spectrometry (GC-SIM-MS) was developed to determine 24 organic compounds involving the organochlorine pesticides (OCPs), organophosphorous pesticides (OPPs) and pyrethroids pesticides residues in leather. The extraction conditions (such as the extraction solution, purification procedure and solid-phase extraction column) were optimized using the positive leather samples based on the recovery rates of the pesticides. The best extraction solution, solid-phase extraction column and chromatography column were n-hexane and ethyl acetate (1+1, volume) mixed solution, Carb-PSA (1.0 g, 6mL) and DB-1701 (length: 30 m, inside diameter: 0.25 mm, film thickness: 0.25 μm). The optimized extraction time and temperature were 20 min and 25°C, respectively. The detection limits of 24 pesticide residues range from 0.05 to 0.10 mg/kg, and the recoveries range from 74% to 116%. The relative standard deviations (RSD, n=6) range from 5.42% to 12.00%. The developed method presented a simple, rapid, sensitive, and inexpensive method to detect 24 pesticides in skin and leather and was successfully applied to the detect them in leather products (cowhide, sheep leather and pig leather).

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Rachmaniah, Orchidea, Muhammad Rifqy Muhsin, Angga Widya Putra und Muhammad Rachimoellah. „Purification of Curcuminoids from Natural Deep Eutectic Solvents (NADES) Matrices Using Chromatography-Based Separation Methods“. Indonesian Journal of Chemistry 21, Nr. 4 (11.08.2021): 806. http://dx.doi.org/10.22146/ijc.58935.

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Curcuminoids can be successfully extracted from Curcuma zedoaria using natural deep eutectic solvents (NADES) as extraction solvents. However, a mixture of extracted curcuminoids, NADES, and impurities from C. zedoaria was obtained as a slurry at the end of the extraction process. Therefore, further separation and purification were required to obtain the extracted compound in high purity. Herein, two purification methods based on classical column chromatography (CCC) and solid-phase extraction (SPE), were evaluated for the purification of curcuminoids from NADES matrices after extraction. Choline chloride–malic acid–water (CCMA–H2O) and choline chloride–citric acid–water (CCCA–H2O) in the molar ratio of 1:1:18 were selected as NADES matrices due to their high solubility and stabilization capability for curcuminoids. Ethanol-conditioned silica gel (60–200 µm) was applied as the bed resin for CCC, and a C18 cartridge was used for SPE. Acetonitrile/0.1% acetic acid, water/0.1% acetic acid, and iso-propanol/0.1% acetic acid were used as mobile phases for CCC. For SPE, methanol/0.05% acetic acid and water/0.05% acetic acid were applied in the conditioning step, water/0.05% acetic acid in the washing step, and methanol/acetonitrile (1:1) in the eluting step. The SPE method produced higher recovery of curcuminoids from the CCCA–H2O and CCMA–H2O matrices (75.27% and 73.40%, respectively) compared to CCC (51.9% and 61.0%, respectively). After removing the NADES constituents from the crude extract of curcuminoids, recrystallization was attempted.

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Pernica, Marek, Karim C. Piacentini, Karolina Benešová, Josef Čáslavský und Sylvie Běláková. „Analytical techniques for determination of mycotoxins in barley, malt and beer: A review“. KVASNY PRUMYSL 65, Nr. 2 (15.04.2019): 46–57. http://dx.doi.org/10.18832/kp2019.65.46.

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The increasing interest in defining the content of mycotoxins is related to the development of methods for their determination. Several methods of determination have been published. This paper describes analytical procedures such as (a) sample preparation – sampling and homogenization, (b) extraction and purification – solid phase extraction (SPE), a QuEChERS method (acronymic name from quick, easy, cheap, effective, rugged and safe), solid-liquid extraction (SLE) and immuno affinity extraction (IAE). It also provides a review of, (c) instruments, and other analytical methods such as thin layer chromatography (TLC), enzyme linked immune sorbent assay (ELISA) and liquid chromatography (LC), gas chromatography (GC) with different detectors for determination of mycotoxin in barley, malt and beer are discussed.

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Gilar, Martin, und Edouard S. P. Bouvier. „Purification of crude DNA oligonucleotides by solid-phase extraction and reversed-phase high-performance liquid chromatography“. Journal of Chromatography A 890, Nr. 1 (August 2000): 167–77. http://dx.doi.org/10.1016/s0021-9673(00)00521-5.

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XIANG, Lei-Lei, Yang SONG, Yong-Rong BIAN, Hong-Jie SHENG, Guang-Xia LIU, Xin JIANG, Guo-Hua LI und Fang WANG. „A Purification Method for 10 Polybrominated Diphenyl Ethers in Soil Using Accelerated Solvent Extraction-Solid Phase Extraction“. Chinese Journal of Analytical Chemistry 44, Nr. 5 (Mai 2016): 671–77. http://dx.doi.org/10.1016/s1872-2040(16)60929-5.

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Poling, Stephen M., und Ronald D. Plattner. „Rapid Purification of Fumonisins and Their Hydrolysis Products with Solid-Phase Extraction Columns“. Journal of Agricultural and Food Chemistry 47, Nr. 6 (Juni 1999): 2344–49. http://dx.doi.org/10.1021/jf981109h.

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Okubo, Kohei, Koji Ikeda, Ayaka Oaku, Yuki Hiruta, Kenichi Nagase und Hideko Kanazawa. „Protein purification using solid-phase extraction on temperature-responsive hydrogel-modified silica beads“. Journal of Chromatography A 1568 (September 2018): 38–48. http://dx.doi.org/10.1016/j.chroma.2018.07.027.

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