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关键词:'magnetic stir bars'
显示 1-30 共 32 条结果 关于 "magnetic stir bars" 范围 论文
Jin Zeng et al.
Journal of chromatography. A, 1614, 460715-460715 (2019-11-25)
It is challenging to greatly increase of the extraction selectivity and efficiency by stir bar sorptive extraction of ultra-trace polychlorinated biphenyls (PCBs) in complex environmental matrix, e.g., soils. To fulfill this purpose, one of the critical works is to prepare
Myriam Díaz-Álvarez et al.
Journal of chromatography. A, 1469, 1-7 (2016-09-30)
In this work, novel molecularly imprinted stir-bars based upon the entrapment of modified magnetic nanoparticles within an imprinted polymer monolith is developed for stir-bar sorptive extraction (SBSE). Firstly, magnetic nanoparticles were surface modified with oleic acid followed by encapsulation inside
Feras Abujaber et al.
Talanta, 201, 266-270 (2019-05-28)
Magnetic cellulose nanoparticles (MCNPs) were used for the first time as sorbents for stir bar-sorptive dispersive microextraction (SBSDME). The main experimental parameters involved in the SBSDME process that affect extraction (i.e. amount of MCNPs, ionic strength, pH, extraction and back-extraction
Víctor Vállez-Gomis et al.
Journal of chromatography. A, 1624, 461229-461229 (2020-06-17)
This work describes a sensitive and rapid analytical method for trace determination of polycyclic aromatic hydrocarbons (PAHs) in cosmetic samples. The proposed method is based on stir bar sorptive-dispersive microextraction (SBSDME). A magnetic composite made of CoFe2O4 magnetic nanoparticles embedded
Abdolraouf Samadi-Maybodi et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 218, 127-135 (2019-04-09)
In this study, a simple and novel photocatalytic tool was proposed and developed for photoelimination of toxic metal ions in aqueous solution. CdS quantum dots capped with thioglycolic acid and CdS @ magnetized powder activated carbon (CdS@MPAC) fixed on magnetic
Jun Peng et al.
Analytical and bioanalytical chemistry, 409(17), 4157-4166 (2017-05-19)
Although stir bar sportive extraction was thought to be a highly efficiency and simple pretreatment approach, its wide application was limited by low selectivity, short service life, and relatively high cost. In order to improve the performance of the stir
Juan L Benedé et al.
Journal of chromatography. A, 1564, 25-33 (2018-06-12)
This work describes a new method for the determination of organic compounds in solid samples based on the equilibrium desorption of the analytes in an aqueous phase followed by stir bar sorptive-dispersive microextraction (SBSDME). Sand samples, contaminated with UV filters
José Grau et al.
Journal of chromatography. A, 1593, 9-16 (2019-02-18)
This work describes a new analytical method useful for monitoring the human exposure to the endocrine-disrupting plasticizer triphenyl phosphate (TPP) via nail polish use. The method allows trace determination of this parent compound and its main metabolite, namely diphenyl phosphate
Juan L Benedé et al.
Talanta, 147, 246-252 (2015-11-26)
In this work, a new approach that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive solid phase extraction (DSPE), i.e. stir bar sorptive-dispersive microextraction (SBSDµE), is employed as enrichment and clean-up technique for the sensitive determination of
Xin Zhou et al.
Chemical science, 9(9), 2575-2580 (2018-05-03)
Pickering emulsion is emerging as an advanced platform for catalysis because of the large oil/water interface area for reaction and its superior efficiency. How to enhance the mass transportation within the micro-droplets is the biggest obstacle in further improving the
Esther Turiel et al.
Journal of separation science, 35(21), 2962-2969 (2012-10-16)
Stir-bar sorptive extraction is based on the partitioning of target analytes between the sample (mostly aqueous-based liquid samples) and a stationary phase-coated magnetic stir bar. Until now, only PDMS-coated stir bars are commercially available, restricting the range of applications to
Yu-Wen Huang et al.
Journal of chromatography. A, 1564, 51-58 (2018-06-16)
A dumbbell-shaped magnetic stir-bar with sublimate sorbent was prepared for the stir bar sorptive extraction (SBSE) of pesticides in an aqueous sample prior to gas chromatography-micro-electron capture detection (GC-μECD). Cyclododecane (CDD) was coated onto a magnetic stir-bar surface as a
J I Cacho et al.
Talanta, 195, 796-799 (2019-01-11)
A device for headspace sorptive extraction (HSSE) combined with gas chromatography separation and mass spectrometry detection (GC-MS) is presented. The gadget is based on a simple magnetic disk that permits the stir bar to be placed at the top of
Pierre-Yves Gires et al.
Physical chemistry chemical physics : PCCP, 22(38), 21678-21684 (2020-09-24)
Mixing of reactants in microdroplets predominantly relies on diffusional motion due to small Reynolds numbers and the resulting absence of turbulent flows. Enhancing diffusion in microdroplets by an auxiliary noise source is therefore a topical problem. Here we report on
Xiao Li et al.
Journal of chromatography. A, 1634, 461700-461700 (2020-11-25)
A hexafluroisopropanol (HFIP)-alkanol supramolecular solvent (SUPRAS) based magnetic solvent bar (MSB) liquid-phase microextraction (LPME) method was proposed for extraction of non-steroidal anti-inflammatory drugs (NSAIDs, including ketoprofen, naproxen, indomethacin and diclofenac) in human serum. The restricted access HFIP-alkanol SUPRAS was prepared
Frank David et al.
Journal of chromatography. A, 1152(1-2), 54-69 (2007-01-24)
Stir bar sorptive extraction (SBSE) was introduced in 1999 as a solventless sample preparation method for the extraction and enrichment of organic compounds from aqueous matrices. The method is based on sorptive extraction, whereby the solutes are extracted into a
Jia Li et al.
Journal of chromatography. A, 1474, 32-39 (2016-11-12)
A kind of solid phase microextraction configuration combining the principles of hollow fiber solid phase microextraction (HF-SPME) and stir bar sorptive extraction (SBSE) is presented. The main feature of HF-SBSE is the use of microporous hollow fiber acting as the
Carlo Bicchi et al.
Journal of agricultural and food chemistry, 50(3), 449-459 (2002-01-24)
Headspace sorptive extraction (HSSE) and stir bar sorptive extraction (SBSE), two recently introduced solventless enrichment techniques, have been applied to the analysis of the headspace of Arabica roasted coffee and of the headspace of the brew and of the brew
Qirong Xiong et al.
Nature communications, 9(1), 1743-1743 (2018-05-03)
Microfluidic biochips hold great potential for liquid analysis in biomedical research and clinical diagnosis. However, the lack of integrated on-chip liquid mixing, bioseparation and signal transduction presents a major challenge in achieving rapid, ultrasensitive bioanalysis in simple microfluidic configurations. Here
Armin Fashi et al.
Talanta, 182, 299-305 (2018-03-05)
A novel and efficient device of solvent stir-bar microextraction (SSBME) system coupled with GC-FID detection was introduced for the pre-concentration and determination of malondialdehyde (MDA) in different biological matrices. In the proposed device, a piece of porous hollow fiber was
Mazaher Ahmadi et al.
Analytica chimica acta, 958, 1-21 (2017-01-24)
In recent years, application of nanomaterials as sorbent has gained the attention of researchers in bioanalysis. Different nanomaterials have been utilized as the sorbent in extraction techniques such as solid phase extraction, dispersive solid phase extraction, magnetic solid phase extraction
Marion Ritzi-Lehnert et al.
Biomedical microdevices, 13(5), 819-827 (2011-05-24)
Point-of-care (PoC) testing followed by personalized efficient therapy of infectious diseases may result in a considerable reduction of associated health care costs. Lab-on-a-chip (LoC) systems represent a potentially high efficient class of PoC tools. Here, we present a LoC system
Setare Gorji et al.
Talanta, 194, 859-869 (2019-01-06)
Reuse of polyethylene terephthalate (PET) bottles for storage of water and liquid food is so common in some countries of the world. However, it can result in the migration of plastic components or additives into the stored liquids and threatening
Regina Helena Costa Queiroz et al.
Journal of pharmaceutical and biomedical analysis, 48(2), 428-434 (2008-05-20)
A sensitive and reproducible stir bar-sorptive extraction and high-performance liquid chromatography-UV detection (SBSE/HPLC-UV) method for therapeutic drug monitoring of carbamazepine, carbamazepine-10,11-epoxide, phenytoin and phenobarbital in plasma samples is described and compared with a liquid:liquid extraction (LLE/HPLC-UV) method. Important factors in
G P Mendes et al.
Journal of microbiological methods, 115, 1-5 (2015-05-15)
Transformation of non-competent Escherichia coli JM109 was accomplished using pUC19 as donor plasmid and sepiolite as the acicular material to promote cell piercing via application of friction with a polystyrene stick or a magnetic bar on the surface of a
Yonghua Wang et al.
Journal of separation science, 41(1), 180-194 (2017-06-20)
Metal-organic frameworks are promising materials in diverse analytical applications especially in sample pretreatment by virtue of their diverse structure topology, tunable pore size, permanent nanoscale porosity, high surface area, and good thermostability. According to hydrostability, metal-organic frameworks are divided into
Andrea Speltini et al.
Analytica chimica acta, 974, 1-26 (2017-05-26)
This paper presents an overview of the recent applications of molecularly imprinted polymers (MIPs) to sample preparation. The review is thought to cover analytical procedures for extraction of contaminants (mainly illegal/noxious organic compounds) from food and environmental matrices, with a
Paula Berton et al.
Molecules (Basel, Switzerland), 26(1) (2020-12-31)
In this study, three magnetic ionic liquids (MILs) were investigated for extraction of four estrogens, i.e., estrone (E1), estradiol (E2), estriol (E3), and ethinylestradiol (EE2), from environmental water. The cation trihexyl(tetradecyl)phosphonium ([P66614]+), selected to confer hydrophobicity to the resulting MIL
Ana Lúcia de Toffoli et al.
Journal of separation science, 41(1), 288-302 (2017-10-07)
The application of graphene-based sorbents in sample preparation techniques has increased significantly since 2011. These materials have good physicochemical properties to be used as sorbent and have shown excellent results in different sample preparation techniques. Graphene and its precursor graphene
Mamoru Haratake et al.
Colloids and surfaces. B, Biointerfaces, 149, 72-79 (2016-10-14)
Sup35 is a prion-like protein from yeast and shares the ability to transmit its aberrant fold and to aggregate into amyloid fibrils. 7GNNQQNY13 from the prion-determining domain of Sup35 was reported to form an amyloid. We first investigated the self-aggregation
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