Lan Ding

Jilin University | JUT · College of Chemistry

In this manuscript, a novel strategy to design and prepare magnetic molecularly imprinted polymers (MMIPs) is proposed. Based on the synthesized MMIPs, a fluorescent sensor for low-cost and fast detection of Sudan I was established. Under the optimal conditions, the fluorescence intensity of MMIPs decreased linearly with the concentration of Sudan...

The development of cost-effective and easy-operate adsorbents with tunable adsorption performance is of great importance while remains a big challenge. Herein, cellulose-incorporated imprinted material (CMC-MIPs) with solvent-regulated adsorption property was designed and synthesized using the functionalized cellulose (CMC-MA) as main cross-linker...

While a number of methods towards water-compatible molecularly imprinted polymers (MIPs) have been reported, new strategies affording simple preparation process and enhanced adsorption selectivity towards templates are needed to promote the further development of MIPs. Herein, we propose a novel method for preparing water-compatible MIPs (Cu-CMMIPs...

A novel type of biomass carbonized polymer dots (CS-CPDs) with green fluorescence emission were synthesized via a one-step microwave-assisted method, using chitosan and maleic acid as the precursors. The fluorescence intensity of CS-CPDs was selectively enhanced (turn on) with increasing levofloxacin (LEV) concentration based on Aggregation Induced...

In this paper, the snowflake-like ZnO nanomaterials were prepared by combining zinc salt impregnation and high-temperature calcination with carbon microspheres as the sacrificial template. The effects of ethanol concentration in aqueous solution on the microstructure and sensing properties of ZnO nanomaterials were investigated. The results showed...

As a type of synthetic polymeric materials with selective recognition, molecularly imprinted polymers (MIPs), have possessed wide-ranging applications for selective separation and enrichment of targets analytes in complex sample matrix. However, when using MIPs as conventional solid phase extraction adsorbents for complex samples pretreatment, comp...

The construction of gas sensors with excellent gas sensitivity and low operating temperature is of great importance while challenging. In this work, using indium nitrate, urea, and sucrose as precursors, In2O3 nanomaterials with the porous rod-like structure were prepared via hydrothermal method combined with high-temperature calcination. FTIR and...

Facile and versatile adsorbents with fast separation and tunable adsorption performance based on molecularly imprinting polymers hold significant potential to improve the efficiency of sample pretreatment. In this work, a type of magnetic imprinted materials (SMMIPs) was prepared, using magnetic multi-walled carbon nanotubes ([email protected]3O4)...

In this study, magnetic molecularly imprinted polymers (MMIPs) with enhanced selectivity were synthesized using sulfamethazine (SMZ) as template molecule and hydrophilic triethylene glycol dimethacrylate as cross-linker. Compared with that of imprinted polymers ([email protected]) prepared with commonly used ethylene glycol dimethacrylate, MMIPs wi...

A convenient, cost-effective and fast method using dynamic microwave-assisted extraction and liquid phase microextraction based on the solidification of a floating drop was proposed to analyze organochlorine pesticides in grains including rice, maize and millet. Twelve samples can be processed simultaneously in the method. During the extraction pro...

The widespread addition of sulfa antibiotics in feeds has long been an environment safety issue. Therefore, it is quite meaningful to constantly propose better solutions for determining the sulfa antibiotics in the environment. Herein, molecularly imprinted electrospun nanofibre membrane (MIM) assisted stir bar sorptive extraction method for the de...

A direct sampling hydride generation (HG) system based on modified gas liquid separator (GLS) coupled with in situ dielectric barrier discharge (DBD) is first rendered to detect lead in blood samples. Herein, a triple-layer coaxial quartz tube was employed as DBD trap (DBDT) to replace the original atomizer of atomic fluorescence spectrometry (AFS)...

An in situ dielectric barrier discharge (DBD) employed as a preconcentration device was coupled with hydride generation atomic fluorescence spectrometry (HG-AFS) for the determination of antimony (Sb) that migrated from plastic to bottle water. In the presence of oxygen under a 7.5 kV discharge, Sb was completely trapped on the surface of dielectri...

The fabrication of facile and versatile adsorbents with switchable adsorption performance based on molecularly imprinting polymers is of great interest although still very challenging. Herein, a dynamic solvent-responsive poly (ethylene glycol) unit-containing chain was introduced as cross-linker to prepare solvent-responsive molecularly imprinted...

A novel approach was proposed to prepare carbon dots (CDs) by acid carbonization and hydrothermal treatment of pork rib bones from food waste. The synthesized animal waste biomass CDs have the merits of eco-friendly, superior fluorescence properties and biocompatibility. The fluorescence of animal waste biomass CDs could be quenched efficiently by...

A novel dielectric barrier discharge (DBD) reactor was utilized to in situ enrich and atomize lead in gas phase. The structure of DBD reactor was optimized to broaden the acidity window of plumbane generation from 1% to 3.5%, bringing better analytical stability and practicability deriving from hydride generation process. For the first time DBD pro...

Ultraviolet vapor generation (UVG), as an environmental/user-friendly and efficient sampling approach, was first combined with the gas phase enrichment of Se by dielectric barrier discharge (DBD) microplasma. Volatile Se species from UVG, being much more complicated than conventional hydrides, can be trapped quantitatively (~100%) on the quartz sur...

β -cyclodextrin (β-CD) and its derivatives are an emerging class of functional monomers that find widespread use in molecular imprinting. It is well known that β-CD and its derivatives are capable of forming host-guest interaction inclusion complexes with many guest molecules. Molecularly imprinted polymers prepared via this type of interaction hav...

A custom-tailored design was proposed for the fabrication of carbon dots coupled with restricted access materials and molecularly imprinted polymers (CDs@RAM-MIPs) to detect metronidazole (MNZ). Biomass carbon dots (CDs) were derived from longan peels assisted with high pressure microwave, and had the merits of eco-friendly, excellent photostabilit...

Photoluminescence carbon dots (CDs) have chemical stability, water dispersibility and biocompatibility. Although various methods have been used to synthesize CDs, green synthesis approaches with inexpensive raw materials are paying more and more attention. It is a development trend that transforming low-value waste into high-value biomass CDs to re...

Non-conjugated polymer carbon dots (PCDs) with a 9% fluorescence quantum yield were synthesized by a pyrolytic method using polyethyleneimine as the sole precursor. The PCDs have an average size about 2.1 nm and a blue fluorescence, with excitation/emission maxima at 380/457 nm, that is quenched by the drug metronidazole. The method has a linear re...

High sensitivity and selectivity detection of NO at room temperature has always been full of challenges. In this work, a kind of porous ZnO with coralline-like nanostructure was prepared by a rapid and simple solid-state synthesis strategy, using zinc acetate and oxalic acid as precursors. Structural analysis and morphological investigations of the...

A novel direct sampling hydride generation (HG) system was utilized and is first reported to introduce a blood sample into a in-situ dielectric barrier discharge atomic fluorescence spectrometer (DBD-AFS) for ultra- trace determination of arsenic based on the gas phase enrich- ment (GPE) principle. The in-situ DBD unit was fitted with three concent...

The construction of simple and low-cost light-emitting diode (LED)based on carbon dots (CDs)powder is an important and challenging task. Here, diamond-like carbon (sp ³ C)structure-doped carbon dots (D-CDs)powder was prepared within 8 min via a one-step microwave-assisted pyrolysis route with a high production yield of 67.8%. The obtained D-CDs pow...

A novel direct sampling (DS-HG) system consisting of an enlarged gas liquid separator (GLS) coupled with a foam breaker was firstly utilized for the in-situ dielectric barrier discharge atomic fluorescence spectrometer (DBD-AFS). After direct dilution using 5% HCl (v:v), a prepared blood sample was introduced into the DS-HG with a UV digestion unit...

Polymer dots (PDs) were synthesized at 200 °C for 90 min via a microwave-assisted method. The PDs were characterized by fluorescence spectroscopy, UV-vis absorbance spectra, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The PDs display blue fluorescence under 320 nm excitation with...

In this work, the slurry sampling hydride generation (SLS-HG) system was first coupled with the in-situ dielectric barrier discharge atomic fluorescence spectrometry (DBD-AFS) for arsenic analysis in biological samples based on the gas phase enrichment (GPE) principle. After a simple slurry dilution with 5% HCl (v:v) for microbiological and hair sa...

Fluorescent carbon quantum dots are emerging as a new class of fluorescent probes due to their unique optical properties. Herein, we presented a simple, one-pot and effective preparation strategy for copper-functionalized carbon quantum dots (Cu-CDs). The Cu-CDs demonstrated excitation-independent emissions, high fluorescent quantum yield (~ 24.4%)...

The solid-phase pyrolysis method is widely used in the synthesis of fluorescent carbon dots (CDs) because of its large scale and solvent-saving advantages. However, CDs are inclined to agglomerate during the synthesis process, resulting in low quantum yield (QY) and inhomogeneous distribution of particle sizes. Here, a simple and effective solid di...

Biomass carbon dots (CDs) prepared by sweet potato peels were superior fluorophores with low toxicity and excellent photostability. A novel designed fluorescence probe for specific recognition and sensitive detection of oxytetracycline (OTC) was fabricated with CDs and molecularly imprinted polymer (MIP). The quenching of CDs happened when rebindin...

In this work, a magnetic molecularly imprinted polymer (Fe3O4@SiO2@MIPs) was prepared via a surface-imprinted method for the determination of the triazines in environmental water samples combined with high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). The Fourier transform infrared spectroscopy (FTIR) and vibrating sample...

Spherical molecularly imprinted polymers (MIPs) were prepared by emulsion polymerization. The isothermal adsorption and selective adsorption indicated that the MIPs obtained exhibit excellent specific recognition for the template (atrazine) and its analogues. The MIPs were encapsulated in a polypropylene microporous membrane to fabricate MIP adsorp...

In this work, a fast and selective method based on magnetic extraction is presented for the simultaneous extraction of sulfonamides (SAs) and fluoroquinolones (FQs), followed by liquid chromatography-tandem mass spectrometry detection. In this method, magnetic surface double-template molecularly imprinted polymers (MSdt-MIPs) with superparamagnetic...

A rapid and simple method for the synthesis of boron acid modified expanded graphite (B-EG) with the assist of microwave irradiation was developed. The synthesis process can be completed in one-step, where H2SO4 and H3BO3 were used as intercalating agent and KMnO4 was used as oxidizing agent. The obtained B-EG was worm-like and lamellar structure w...

A fluorescent probe is presented for sensitive determination of Hg(II). It is based on aggregation induced enhancement effect (AIEE) of carbon dots co-doped with nitrogen and sulfur (N,S-CDs). The N,S-CDs were prepared by a one-pot microwave-assisted method using glycerol as the reaction solvent, and cystine as the source for C, N and S. The result...

It is difficult to detect tetracycline (TC) in honey sample by using carbon dots (CDs) because the autofluorescence of the matrix of honey sample overlaps with the fluorescence emission spectrum of the large majority of CDs. Herein, single-hole hollow molecularly imprinted polymers embedded carbon dots ([email protected]) was prepared via microwave...

Highly selective nitrogen-doped carbon quantum dots (ND-CQDs) for copper ion (Cu2+) determination were synthesized by a solvent-free pyrolysis of citric acid and histidine. The resultant ND-CQDs display a stable bright blue fluorescence with a satisfactory product yield of 56% and quantum yield of 16%. The ND-CQDs not only show good photostability...

Uniform N- and S-co-doped carbon dots (NSCDs) with fluorescence quantum yields of up to 64% were synthesized via a one-step microwave-assisted method. Ammonium citrate and L-cysteine act as precursors, and synthesis is completed in 2.5 min using a 750 W microwave oven to give a 62% yield. The NSCDs show bright blue fluorescence (with excitation/emi...

In this work, a superhydrophilic surface imprinting composite resin was constructed for selective enrichment of triazines, which was first fabricated by one-pot condensation of formaldehyde, resorcinol and melamine on the surface of the magnetic multi-walled carbon nanotubes ([email protected]3O4). The effect of the amount of template (ametryn) on...

Monodisperse superhydrophilic melamine formaldehyde resorcinol resin (MFR) microspheres were prepared in 90 min at 85 °C via a microwave-assisted method with a yield of 60.6%. The obtained MFR microspheres exhibited narrow size distribution with the average particle size of about 2.5 µm. The MFR microspheres were used as absorbents to detect triazi...

Chlorfenapyr and abamectin are two insecticides used commonly in rice-planting to control insects and mites. The residue remained in rice present potential health hazard to consumers. To realize the accurate determination of chlorfenapyr and abamectin in rice samples, a method based on dynamic microwave assisted extraction (DMAE) coupled with matri...

In this work, magnetic superhydrophilic molecularly imprinted resins (MMIRs) were prepared for the determination of triazines in aqueous samples combined HPLC-MS/MS. The amino functionalized magnetic nanoparticles were introduced into superhydrophilic molecularly imprinted resins based on one-pot condensation of resorcinol, melamine and formaldehyd...

A simple and rapid method based on multi-throughput dynamic microwave-assisted extraction coupled online with salting-out-assisted liquid–liquid extraction was developed for the analysis of chlorpyrifos in soil. First, the chlorpyrifos was extracted with acetonitrile aqueous (50%, v/v) under the action of microwave energy. Then the obtained extract...

A simple and rapid sample pretreatment method was proposed for the analysis of tetrabromobisphenol A in soil samples by coupling high-throughput dynamic microwave-assisted extraction with liquid-liquid extraction (LLE), by which up to 15 samples can be treated simultaneously in 20 min. A weakly polar solvent was employed as the extraction solvent,...

A facile, novel and efficient approach to extract six triazine herbicides from honey samples based on hydrophilic molecularly imprinted resins (MIRs) was described. The MIRs were prepared in a one-pot polycondensation with resorcinol and melamine as the double functional monomers, formaldehyde as a crosslinking agent, and ametryn as the template. T...

Fluorescent CDs were prepared by using thiourea as the carbon source and diethylene glycol as the reaction medium. The CDs were obtained only within three minutes under microwave irradiation and their particle size was mainly distributed in the range of 1.5–3.5 nm. The average particle size was 2.3 nm with a standard deviation of 0.5 nm. The fluore...

In this work, Zn(OH)2 nanosheets embedded with carbon dots (CDs) were prepared through a template-free microwave-assisted route for the first time. The preparative strategy was facile, green and cost-effective. The final composites possessed uniform size distribution, good fluorescence property, excellent stability and fast adsorption ability for m...

A green and high-throughput analytical method was described for the simultaneous determination of ten sulfonamides (SAs) from soil, sediment, and sludge in northeast China. None of potentially hazardous organic solvents was used in the whole sample preparation procedure, and the total preparation time of 15 samples was about 18 min. The limits of d...

In this work, we reported a green route for the fabrication of fluorescent carbon dots (CDs). Wool, a kind of nontoxic and natural raw material, was chosen as the precursor to prepare CDs via a one-step microwave-assisted pyrolysis process. Compared with previously reported methods for preparation of CDs based on biomass materials, this method was...

Heteroatom doped carbon dots (CDs) have received increasing attention due to their unique properties and related applications. However, previously reported CDs generally show strong emission only in the blue-light region, thus restricting their further applications. And the fundamental investigation on the preparation process is always neglected. H...

In this study, we proposed a rapid and efficient method for the preparation of the expanded graphite (EG). The exfoliation process was accelerated by microwave irradiation, and the preparation time was greatly shortened. The obtained EG was worm-like in shape and exhibits well exfoliated structure. It was successfully applied as solid-phase extract...

In this paper, nitrogen-doped carbon dots (N-CDs) with a quantum yield of 23.6 % were successfully synthesized by microwave pyrolysis of urea using diethylene glycol as the high boiling point reaction medium. The N-CDs were spherical and monodisperse with a size distribution between 1.5 and 5.5 nm. The N-CDs exhibited excellent water-soluble proper...

A novel Fe3O4-graphite composite was prepared, characterized, and investigated as a heterogeneous Fenton-like catalyst for the degradation of levofloxacin (LEV) in an aqueous solution. The results revealed that the Fe3O4-graphite composite exhibited excellent properties for the degradation and mineralization of LEV, achieving a nearly complete degr...

Herein, we present a one-pot microwave-assisted preparative method for water-soluble carbon dots (CDs) in an immiscible system. CDs demonstrated uniform morphology, high quantum yield and excitation-independent fluorescence emission. Moreover, we first reported the observation of thermally activated delayed fluorescence from CDs.

A rapid and simple multi-throughput dynamic microwave-assisted leaching combined with inductively coupled plasma atomic emission spectrometry determination has been proposed for the simultaneous determination of Cu, Mn, Zn and Pb in soil. The approach combines the advantages of microwave and dynamic leaching technique, and up to five samples could...

In this paper, a simple and reproducible method for the determination of roxithromycin in human plasma samples is proposed. The surface magnetic molecularly imprinted polymers (MMIPs) were utilized as sorbent. Roxithromycin was used as imprinted compound. The experimental results showed that the MMIPs had high affinity and selectivity toward roxith...

In this paper, a novel, selective and eco-friendly sensor for the detection of tetracycline was developed by grafting imprinted polymers onto the surface of carbon quantum dots. A simple microwave-assisted approach was utilized to fabricate the fluorescent imprinted composites rapidly for the first time, which could shorten the polymerization time...

In this paper, the barium sulfate-coated magnetite particles (Fe3O4/BaSO4) which is for mixed hemimicelles solid-phase extraction have been successfully synthesized by chemical coprecipitation method. The Fe3O4/BaSO4 modified by sodium dodecyl sulfate (SDS) was applied for extraction of trimethoprim from environmental water samples. Compared with o...

In this study, we proposed a rapid and simple method for the preparation of molecularly imprinted polymers (MIPs) by emulsion polymerization. The polymerization process was accelerated by microwave heating, and the reaction time was greatly shortened. The obtained MIPs were spherical in shape and exhibited a uniform morphology. The MIPs with select...

In this paper, we presented a novel, rapid and highly sensitive sensor for glutathione (GSH), cysteine (Cys) and histidine (His) based on the recovered fluorescence of the carbon quantum dots (CQDs)-Hg(II) system. The CQDs were synthesized by microwave-assisted approach in one pot according to our previous report. The fluorescence of CQDs could be...

Single-hole hollow molecularly imprinted microspheres (h-MIMs) were prepared by hard template method and applied to extract six triazine pesticides in cereal samples, followed by HPLC-MS/MS detection. The synthesis mechanism of the h-MIMs has been studied. The h-MIMs exhibited bigger specific surface area and much higher binding capacity than the m...

This paper presented a simple and effective solid-phase extraction method using α-zirconium phosphate intercalated by hexadecyl trimethyl ammonium bromide (α-ZrP–CTMAB) as a novel adsorbent. Surfactant-assisted method was applied to prepare α-ZrP–CTMAB whose sorbent properties and extraction efficiency were investigated. Four sulfonamides (SAs) in...

This paper presented a fast, simple and green sample pretreatment method for the extraction of 8 carbamate pesticides in rice. The carbamate pesticides were extracted by microwave assisted water steam extraction method, and the extract obtained was immediately applied on a C18 solid phase extraction cartridge for clean-up and concentration. The elu...

A simple one-pot microwave-assisted approach has been established for the large-scale preparation of carbon quantum dots (CDs) with excellent water solubility and photoluminescence. The properties and mechanism were demonstrated. Moreover, the CDs have been applied to the detection of tetracycline hydrochloride.

A simple and effective method based on magnetic separation has been developed for the extraction of sulfonamides (SAs) from egg samples using magnetic multiwalled carbon nanotubes (MMWCNTs) as an adsorbent. The MMWCNTs were simply prepared by depositing Fe3O4 onto MWCNTs that had been previously oxidised. The extraction procedure was carried out in...

Group-selective magnetic molecularly imprinted polymers (MMIPs) that can extract four widely used sulfonamide antibiotics and their acetylated metabolites from environmental water were synthesized in this study. The MMIPs with saturation magnetization value of 16.7 emu g(-1) could be separated from the environmental water samples easily by the appl...

In this work, a simple and fast sample pretreatment method was proposed for determination of steroid hormones in fish tissues by coupling dynamic microwave-assisted extraction with salting-out liquid-liquid extraction. The steroid hormones were successively extracted with acetonitrile and water under the action of microwave energy. Subsequently, th...

A method based on cloud point extraction (CPE) coupled with high-performance liquid chromatography separation and ultraviolet (UV) detection was developed to determine andrographolide and dehydroandrographolide in human plasma. The nonionic surfactant Triton X-114 was chosen as the extraction medium. Variable parameters affecting the CPE efficiency...

In this work, microwave-assisted steam extraction (MASE) followed by high performance liquid chromatography is described for the extraction and determination of paeonol in Cortex moutan. This new approach was based on the combination of microwave-assisted extraction and steam distillation. No organic solvent was used and no clean-up step was requir...

A method was developed using magnetic strong cation-exchange resin modified with 2,4-dinitrophenylhydrazine (DNPH) for the determination of formaldehyde (HCHO) in fruit juice samples. The procedures of extraction and derivatization were carried out in a single step by stirring the resins and diluted fruit juice with water. When the procedures were...

A simple and cost-effective method of dynamic microwave-assisted extraction (DMAE) combined with solidification of floating organic drop (SFO) was developed for determining the five triazine herbicides in cereals. The approach combines the advantages of DMAE and SFO technique, and up to 15 samples can be treated simultaneously in 16 min. Firstly, t...

In the work, a rapid, simple and high-throughput sample preparation method was developed for the determination of sulfonamide (SA) antibiotic residues in chicken breast muscle. The extraction and clean-up were online combined and up to 20 samples can be treated simultaneously in 6 min. The SAs were first extracted with acetonitrile under the action...

An environmentally friendly method for the determination of fluoroquinolone (FQ) antibiotics including enrofloxacin, ciprofloxacin, levofloxacin, fleroxacin and sparfloxacin in four feeds is proposed. Disodium ethylenediaminetetraacetate (EDTA)–Mcllvaine buffer (0.1molL−1, pH4.0) was used as an extracting solvent and the extraction process was acce...

A simple and low-cost high-throughput dynamic microwave-assisted extraction (HTDMAE) device was firstly assembled and validated by the extraction of nicotine in mushroom samples. In this device, a household microwave oven was applied to provide the microwave energy; a vacuum pump was used to deliver the solvent. Compared with traditional dynamic mi...

A rapid method based on dynamic microwave-assisted extraction (DMAE) coupled on-line with clean-up was developed for the determination of caffeine in tea samples. A TM010 microwave resonance cavity was applied to concentrate the microwave energy. An extraction vessel was placed in microwave irradiation zone of the TM010 microwave resonance cavity....

In this study, silica-coated magnetic nanoparticles (Fe(3)O(4)/SiO(2) NPs) modified by cetyltrimethylammonium bromide (CTAB) were synthesized. They were successfully applied for extraction of xanthohumol in beer based on magnetic mixed hemimicelles solid-phase extraction (MMHSPE) coupled with high-performance liquid chromatography-ultraviolet deter...

In the study, a fast and selective method based on magnetic separation has been developed for the extraction of nicotine from human plasma using magnetic strong cation exchange (MSCX) resins as adsorbent. MSCX resins were prepared using hydrophobic Fe3O4 magnetite as magnetically susceptible component, styrene and acrylic acid as polymeric matrix c...

A new method was developed for the determination of six fluoroquinolone antibiotics including fleroxacin, levofloxacin, ciprofloxacin, lomfloxacin, enrofloxacin, and sparfloxacin in chicken breast muscle, in which the extraction and clean-up were performed in one step by microwave irradiation. The mixture of ACN containing 0.3% v/v phosphoric acid/...

In this work, a rapid and selective method was successfully developed using the magnetic molecularly imprinted polymer (MMIP) as sorbent for the extraction of β-lactam antibiotics (BLAs) from milk samples. The MMIP has been prepared using penicillin V potassium (PENV) as template molecule, methacrylic acid as functional monomer, ethylene glycol dim...

A green and simple method was developed for determination of sulfonamides (SAs) in soil samples. The procedure was based on the microwave-assisted extraction (MAE) of SAs from soil using non-ionic surfactant Triton X-114 as the extraction medium. Then sodium chloride was added into the MAE extract and the mixture was equilibrated for some time at h...

In this study, alumina-coated magnetite nanoparticles (Fe(3)O(4)/Al(2)O(3) NPs) were synthesized, and they were applied to the analysis of sulfonamides (SAs) including sulfadiazine (SDZ), sulfamerazine (SMR), sulfamethoxazole (SMX), sulfamonomethoxine (SMM), sulfamethoxydiazine (SMD), sulfadimethoxine (SDM) and sulfaquinoxaline (SQX) in different s...

A method based on coupling of cloud point extraction (CPE) with high performance liquid chromatography separation and ultraviolet detection was developed for determination of xanthohumol in beer. The nonionic surfactant Triton X-114 was chosen as the extraction medium. The parameters affecting the CPE were evaluated and optimized. The highest extra...

A new method was developed using weak anion exchange resin modified with sodium diethyldithiocarbamate (DDTC) for the derivatization and preconcentration of copper(II) in water prior to spectrophotometric determination. Several conditions affecting the extraction efficiency were investigated. Under the optimum conditions, an enrichment factor of 50...

A simple method based on magnetic separation for selective extraction of fluoroquinolones (FQs) from environmental water samples has been developed using magnetic molecularly imprinted polymer (MMIP) as sorbent. The MMIP has been prepared using ciprofloxacin as template molecule, methacrylic acid as functional monomer, ethylene glycol dimethacrylat...

In the work, magnetic strong cation exchange (MSCX) resins were prepared using hydrophobic Fe(3)O(4) magnetite as the magnetically susceptible component, styrene and divinylbenzene as polymeric matrix components, acetyl sulfonate as the sulfonation agent. The resins were successfully applied to the extraction of melamine (MEL) from egg samples. The...

The magnetic mixed hemimicelles solid-phase extraction (MMHSPE), based on the adsorption of cation surfactant octadecyltrimethylammonium bromide (OTMABr) onto magnetite nanoparticles (Fe(3)O(4) NPs) to form mixed hemimicelles, was proposed for the preconcentration of several sulfonamides (SAs) compounds including sulfamethoxazole (SMX), sulfamethox...

A fast and selective method was developed for the determination of sulfonamides (SAs) in honey based on magnetic molecularly imprinted polymer. The extraction was carried out by blending and stirring the sample, extraction solvent and polymers. When the extraction was complete, the polymers, along with the captured analytes, were easily separated f...

A rapid technique based on dynamic microwave-assisted extraction (DMAE) coupled on-line with solid-phase extraction (SPE) was developed for the determination of sulfonamides (SAs) including sulfadiazine, sulfameter, sulfamonomethoxine and sulfaquinoxaline in soil. The SAs were first extracted with acetonitrile under the action of microwave energy,...

In this work, a new method was developed for the determination of melamine (MEL) in animal feed. The method was based on the on-line coupling of dynamic microwave-assisted extraction (DMAE) to strong cation-exchange (SCX) resin clean-up. The MEL was first extracted by 90% acidified methanol aqueous solution (v/v, pH = 3) under the action of microwa...

Solid-phase extraction (SPE) is an effective sample preparation method for removal of interfering compound and enrichment of analyte. Liquid chromatography (LC) with various detectors is a main separation and detection technique used in the analytical field. This article reviews the literatures about the on-line coupling of SPE with LC. The advanta...

Magnetic molecularly imprinted polymers were prepared using hydrophobic Fe(3)O(4) magnetite as the magnetically susceptible component, oxytetracycline as template molecule, methacrylic acid as functional monomer, and styrene and divinylbenzene as polymeric matrix components. The polymers were applied to the separation of tetracycline antibiotics fr...

In this study, a new type of alumina-coated magnetite nanoparticles (Fe(3)O(4)/Al(2)O(3) NPs) modified by the surfactant sodium dodecyl sulfate (SDS) has been successfully synthesized and applied for extraction of trimethoprim (TMP) from environmental water samples based on mixed hemimicelles solid-phase extraction (MHSPE). The coating of alumina o...

A rapid technique based on microwave-assisted extraction (MAE) coupled online with derivatization, restricted access material cleanup, and high-performance liquid chromatography (HPLC) was developed for the determination of formaldehyde in aquatic products. Formaldehyde was first extracted with water under the action of microwaves and then directly...

An automated on-line solid-phase extraction-liquid chromatography-tandem mass spectrometry (SPE-LC-MS/MS) system was developed for the determination of macrolide antibiotics including erythromycin (ETM), roxithromycin (RTM), tylosin (TLS) and tilmicosin (TMC) in environmental water samples. A Capcell Pak MF Ph-1 column packed with restricted access...