最新刊期
卷 34 ， 期 2 ， 2015
- 摘要：A facile and low-toxicity approach was proposed to synthesize a new magnetic adsorbent(Fe3O4@PDA@RGO) to remove methylene blue(MB) in water samples.Dopamine could directly adhere to Fe3O4 by one-step self-polymerization reaction，which serves as a reducing agent as well as a coupling agent for the assembly of reduced graphene oxide(RGO).The synthetic progress involves no additional chemicals and thermal treatments.Transmission electron microscope(TEM)，Fourier transform infrared spectroscopy(FTIR)，X-ray diffraction(XRD) and Raman spectroscopy were used to characterize the magnetic composite nanoparticles.The results demonstrated that Fe3O4@PDA@RGO has a strong magnetism(37.8 emu?g-1) and exhibits a high adsorption capacity to MB(98 mg?g-1).The adsorption of MB on Fe3O4@PDA@RGO is pH-dependent and favorable in basic solution.The adsorption behavior of MB on Fe3O4@PDA@RGO could be described by the pseudo second order kinetics model and Langmuir isotherm.Furthermore，the as prepared adsorbent can be easily recovered and reused at least ten times due to its high magnetization and stability.关键词：magnetic nanoparticles;dopamine;graphene;adsorbent
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发布时间：2023-05-18 - 摘要：A method for the determination of 17 phthalate acid esters（PAEs） in water-borne adhesives for cigarette by ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）was developed.The samples were dispersed with water and dissolved with methanol at constant volume,then extracted with a vortex mixer vigorously and centrifuged.After passed through an organic phase filter membrane,the extract was analyzed by UPLC-MS/MS.The interference of PAEs that chromatography system introduced was removed with a delay column.The results showed that,the calibration curves of 17 PAEs showed good linearities in the range of 0-5 μg/mL,with correlation coefficients greater than 0.994.The limits of quantitation were in the range of 0.010-0.479 μg/g.The recoveries ranged form 87.6% to 106.0% with relative standard deviations（RSDs,n=6） of 0.8%-6.2%.Compared with YC/T 333-2010 standard method,there was no significant difference between the data obtained by two methods.With the advantages of simplicity and stability,this method was used for the determination of 17 PAEs in water-borne adhesives.关键词：phthalate acid esters;UPLC-MS/MS;water-borne adhesives for cigarette;delay column
- 2002
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- 493
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- 7
发布时间：2023-05-18 - 摘要：A method was developed for the simultaneous determination and identification of 15 mycotoxin residues in dry-cured hams，including aflatoxin B1，aflatoxin B2，aflatoxin G1，aflatoxin G2，ochratoxin A，citrinin，T-2 toxin，HT-2 toxin，diacetoxyscirpenol，neosolaniol，verruculogen，O-methyl sterigmatocystin，sterigmatocystin，cyclopiazonic acid and penicillic acid，by liquid chromatography-tandem triple-quadrupole linear ion trap mass spectrometry（LC-MS/MS）.The dry cured ham samples were purified by QuEChERS method after extraction with acetonitrile solution containing 1% formic acid，then separated on an Eclipse Plus C18 column（3.0 mm×100 mm，1.8 μm） by gradient elution with mobile phases of 5 mmol/L ammonium acetate aqueous solution(containing 0.1% formic acid and 9.9% acetonitrile,A) and acetonitrile(containing 0.1% formic acid,B).A multiple reaction monitoring（MRM） as survey scan and an enhanced product ion（EPI） scan as dependent scan were performed in an information dependent acquisition（IDA） experiment.The identification of compounds was carried out by library search with a newly developed MS/MS library based on EPI spectra in positive mode.The results showed that the calibration curves were linear in the range of 0.05-200 μg/L for 15 mycotoxins with correlation coefficients（r） more than 0.993.The limits of quantitation（LOQs，S/N=10） were in the range of 0.05-2.5 μg/kg.The average recoveries（n=6） of 15 mycotoxins in dry-cured ham samples at three spiked levels（1 times，2 times，10 times of LOQ） ranged from 79.1% to 95.5% with relative standard deviations（RSDs） of 3.2%-12.8%.The method was sensitive，convenient and accurate，and could satisfy the demand for detection of mycotoxin residues in contaminated dry-cured meat.关键词：dry-cured ham;mycotoxins;liquid chromatography-tandem mass spectrometry（HPLC-MS/MS）;dispersive solid phase extraction;QuEChERS
- 2185
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- 604
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- 17
发布时间：2023-05-18 - 摘要：Using density functional theory(DFT) B3LYP method,the preferred molecular conformations and the optimal configurations of kaempferol,quercetin and myricetin quasi-molecular ions in electrospray ion trap mass spectrometry(ESI-ITMS) negative ion mode were studied by the full geometry optimization and the relaxed dihedral potential energy scan.The optimal configurations of three flavonol quasi-molecular ions were confirmed in the aspects of energy parameters,configuration parameters,and mass spectrometry experiments.The results indicated that the degrees of dihedral D(1,2,1′,6′) for kaempferol,quercetin and myricetin were close to 0°,and the preferred conformations of three flavonol compounds were respectively coplanar including A,C and B ring.In the negative ion mode,the complexities of MS2 spectra which were determined by the automatic and manual methods for kaempferol,quercetin and myricetin were successively weakened.The optimal configurations of quasi-molecular ions were the structures lost the hydrogen of phenolic hydroxyl,with the conjugated chain increasing and the conjugated effect strengthening.Two quasi-molecular ion configurations for kaempferol existed,that were loss of 4′-OH hydrogen and 7-OH hydrogen,and the total energy of loss of 4′-OH hydrogen configurations for quercetin and myricetin were the lowest and the most stable.The stabilities of quasi-molecular ion configurations for kaempferol,quercetin and myricetin were increased successively.The analysis of the study can be used as a reference for further exploration of the fragmentation pathway and mechanism of flavonol compounds in ESI-ITMS negative ion mode.关键词：flavonol compounds;electrospray ionization ion trap mass spectrometry(ESI-MS);density functional theory
- 2040
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- 524
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- 0
发布时间：2023-05-18 - 摘要：An enzyme-free electrochemical sensor for the detection of hydrogen peroxide was developed using a nano-composite（Ce1-xGdxO（4-x）/2） modified electrode.The nano-composites were synthesized by hydrothermal method and characeterized by X-ray photoelectron spectroscopy（XPS），scanning electron microscope（SEM），transmission electron microscope（TEM） and X-ray diffractometer（XRD）.The nanocomposites show the typical CeO2 cubic fluorite structure，and the diameter of the composite is about 20 nm.A novel nanoscale hybrid materials nonenzymatic sensor was constructed by immobilizing Ce1-xGdxO（4-x）/2 and chitosan onto glassy carbon electrode（GCE）.The modified electrode was investigated by cyclic voltammetry（CV） and chronoamperometry（I-t）.Under the optimized conditions，the sensor showed a wide dynamic range for the detection of hydrogen peroxide，which catalytic current was linear with hydrogen peroxide concentration in the range of 1.0×10-5-1.1×10-2 mol/L with a detection limit（S/N=3） of 1.7×10-6 mol/L.The sensor is not good enough in sensitivity，but it might have potential applications in the fabrication of nonenzymatic sensor.关键词：nanocomposite of Ce1-xGdxO（4-x）/2;hydrothermal synthesis;modified electrode;hydrogen peroxide;nonenzymatic sensor
- 1954
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- 513
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- 5
发布时间：2023-05-18 - 摘要：A novel electrochemical sensor for ropivacaine hydrochloride(RH) based on graphene quantum dots-molecularly imprinted polymer(MIP) modified glass carbon electrode was constructed.The graphene quantum dots(GQDs) were synthesized by the pyrolysis method,and adsorbed on the surface of conducting poly(o-aminophenol) membrane by π-π stacking，and then the o aminophenol as functional monomer and RH as template molecule were electrochemically imprinted on the film of GQDs to develop the GQDs-MIP sensor.The average lateral size of GQDs characterized by atomic force microscope(AFM) is about 20 nm.The response mechanism of the resulting sensor was investigated by differential pulse voltammetry and the linear relationship of sensor was determined by means of amperometric I-t curve.The results indicated that the calibration curve was linear in the range of 2.0×10-6-6.1×10-4 mol/L，and the detection limit(S/N=3)was 1.1×10-6 mol/L.Compared with the molecular imprinting sensor without GQDs，the GQDs-MIP sensor exhibited a wide linear range and a lower detection limit.The spiked recoveries were in the range of 91.0%-101%.The sensor was applied in the analysis of RH in plasma samples with RH concentration of 4.21×10-6 mol/L.In contrast to the detection result of high performance liquid chromatography(HPLC) method，this electrochemical analytical approach is credible，and could be applied in the detection of RH in clinical samples.关键词：graphene quantum dots(GQDs);molecular imprinting;ropivacaine hydrochloride(RH);o-aminophenol
- 2699
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- 478
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- 4
发布时间：2023-05-18 - 摘要：A high performance liquid chromatography-tandem mass spectrometric(LC-MS/MS) method was developed for the determination of eight kinds of drugs(4-chlorophenoxyacetic acid，indole-3-acetic acid，2,4-dichlorophenoxyacetic acid，indole-3-butyric acid，1-naphthlcetic acid，gibberellin acid，6-benzylaminopurine and carbendazim) in sprouts.The samples were extracted with acetonitrile containing 0.1% acetic acid，concentrated and cleaned up with dispersive solid phase extraction powder.The extract was analyzed by LC-MS/MS.The linear ranges of eight compounds ranged from 5 μg/L to 100 μg/L with correlation coefficients(r2) more than 0.99.The limits of quantitation of eight compounds were 5 μg/kg.At three spiked concentration levels of 5，10，20 μg/kg，the recoveries of eight compounds ranged from 71.6% to 87.9% with relative standard deviations(RSDs) not more than 14.6%.The method was accurate，simple and quick，and was suitable for the simultaneous determination of eight compound residues in sprouts.关键词：high performance liquid chromatography-tandem mass spectrometry(LC-MS/MS);sprouts;drug residues
- 2152
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- 499
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- 3
发布时间：2023-05-18 - 摘要：A solid-phase extraction combined with ultra performance liquid chromatography-tandem mass spectrometric method was established for the simultaneous determination of Sudan Red dyes（Sudan RedⅠ,Ⅱ,Ⅲ and Ⅳ） in poultry eggs and its products.The samples were ultrasonically extracted with n-hexane,and then the supernatant was purified with tonyred dedicated SPE column.The chromatographic separation was performed on a Waters CORTECSTM UPLC-C18（2.1 mm×100 mm,1.7 μm） by gradient elution with 5 mmol/L ammonium acetate solution containing 0.2% formic acid and acetonitrile as mobile phase.The electrospray ionization（ESI） source in the positive mode and multiple-reaction monitoring（MRM） mode were used for the quantitative analysis by the internal standard.The results showed that the calibration curves for four Sudan Red dyes were in good linearities in the range of 0.5-20 μg/L with correlation coefficients more than 0.999.The average recoveries ranged from 80.0% to 104.2% with relative standard deviations（RSDs） of 4.2%-10.9% in low,medium and high standard addition levels.The limits of detection（LODs） and the limits of quantitation（LOQs） of this method were in the ranges of 0.26-0.35 μg/kg and 0.9-1.2 μg/kg for four analytes,respectively.The method was simple,accurate,rapid and sensitive,and could be used for the analysis of Sudan Red dyes in poultry eggs and egg products.关键词：ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）;solid phase extraction;Sudan Red dyes;poultry egg
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发布时间：2023-05-18 - 摘要：A new fluorescence method for the determination of trace Cu2+was developed by using fluorescence resonance energy transfer between carbon quantum dots and fluorescent pink，in which carbon dots acted as an energy donor and FP as an acceptor.It was found that under the conditions of λex=581 nm and pH=8.4 aqueous solution，energy transfered from carbon dots to FP and led to enhance the fluorescence of FP.However,the addition of trace Cu2+made FP fluorescence quenching.The quenching degree was quantitatively in proportion to the trace Cu2+content.Therefore，a novel fluorescence quenching platform for determination of trace Cu2+was constructed.Under the optimum conditions，the calibration curve for Cu2+concentration was linear in the range of 9.42-23.55 μmol/L with a detection limit(3σ/k) of 3.14 μmol/L.The method was applied in the determination of trace Cu2+in river，farmland water and tap water，with spiked recoveries of 98.7%-99.0% and relative standard deviations(RSD) not more than 0.91%.关键词：carbon dots;fluorescent pink;fluorescence resonance energy transfer;trace Cu2+
- 2053
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- 420
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- 5
发布时间：2023-05-18 - 摘要：A headspace gas chromatography-mass spectrometric method was developed for the determination of 14 organic solvent residues in newspaper.The target compounds were separated on a Capillary column(Agilent HP-INNOWAX，60 m×250 μm，0.25 μm)，and detected by the mass spectrometry in selected ion monitoring(SIM) mode.The calibration curves were linear in the range of 2-20 μg，with correlation coefficients not less than 0.995.The limits of detection (LOQ，S/N=10) of fourteen compounds were all less than 0.01 mg/m2.The average recoveries ranged from 86.6% to 101.8% at spiked levels of 3.97-16.28 μg with relative deviations(RSDs，n=6) not more than 6.8%.The method was rapid，accurate and sensitive，and was suitable for the determination of organic solvent residues in newspaper.关键词：headspace gas chromatography-mass spectrometry(HS/GC-MS);residual organic solvents;newspaper
- 2012
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- 3
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- 1
发布时间：2023-05-18 - 摘要：A method has been developed for simultaneous determination of triptolide,triptonide and triptophenolide in traditional Chinese herb Tripterygium wilfordii Hook F.by micellar electrokinetic capillary chromatography（MEKC） combined with activated carbon solid phase extraction.Effects of some important factors,such as pH value of extraction,eluant volume of ethanol，pH value and concentration of running buffer,concentration of sodium dodecyl sulfate（SDS），separation voltage and injection time were investigated.The analytes were extracted with activated carbon in phosphate buffer solution（pH 6.5）,then eluted with 2.0 mL ethanol before separated by MEKC.At 214 nm wavelength,the detection analytes could be well separated within 8 min at separation voltage of 20 kV in 20 mmol/L boric acid-10 mmol/L borax（pH 8.0）-20 mmol/L SDS.Under the optimized conditions,the calibration curves were linear in the range of 4.0×10-5-4.0×10-3 mol/L for triptolide and the triptonide,and 4.0×10-5-1.0×10-3 mol/L for triptophenolide.The detection limits of triptolide,triptonide and triptophenolide were 1.42×10-6,7.90×10-7,2.96×10-7 mol/L,respectively,and the relative standard deviations（RSDs,n=6） for peak areas were 3.2%,5.4%,3.5%,respectively.The proposed method had the advatages of simplicity,rapidness,low sample consumption and accuracy,and was successfully applied in the determination of the analytes in Tripterygium wilfordii tablet with recoveroes of 81.0%-102.9%.关键词：triptolide;triptonide;triptophenolide;solid phase extraction(SPE);micellar electro kinetic capillary chromatography(MEKC)
- 1952
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- 444
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- 3
发布时间：2023-05-18 - 摘要：In this paper,a glucose oxidase CdTe quantum dots modified carbon paste electrode(GOD/CdTe/CPE)was prepared by the synthesis of CdTe quantum dots(QDs) to fabricate modified material and fixed the glucose oxidase(GOD) at the surface of the water-soluble CdTe quantum dots,and achieved the direct electrochemistry of GOD at the electrode surface.QDs CdTe can effectively accelerate the direct electron transfer of GOD with the electrode surface,and the electron transfer efficiency was about 8 times more than that in the absence of QDs CdTe.The electron transfer rate constant K was 0.14 s-1 and transfer coefficient was 0.60.The average amount of coverage(Γ) of GOD on the surface of GOD/CdTe/CPE was 7.9×10-8 mol/cm2.As a third generation glucose biosensor,GOD/CdTe/CPE was successfully applied in the detection of glucose concentration.The calibration curve was linear in the range of 0.050-0.32 mmol/L and the detection limit was 0.020 mmol/L.GOD/CdTe/CPE had the advantages of simple preparation,strong stability,excellent selectivity and reproducibility,and fast response.关键词：CdTe quantum dots(QDs);glucose oxidase;electrochemical biosensor;cyclic voltammetry(CV);direct electrochemistry
- 2670
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- 533
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- 1
发布时间：2023-05-18 -
Highly Sensitive Determination of Cinchonine in Serum Samples by Electrochemical Luminescence Method
摘要：In this paper,the eletrochemical luminescence（ECL） behaviors of cinchonine-Ru（bpy）2+3 system was studied with the gold electrode as working electrode.ECL intensity of Ru（bpy）2+3 could be enhanced significantly in the presence of cinchonine.Based on this fact,a high sensitivity ECL method was established for the determination of cinchonine at gold electrode.Some detection conditions such as concentration and pH value of buffer solution,concentration of Ru（bpy）2+3 and voltage of photomultiplier tube were optimized.In 12 mmol/L boric acid-borax buffer solution（pH 9.0）,the ECL peak counts increased linearly with concentration of cinchonine in the range of 3.0×10-9-6.0×10-6 mol/L.The detection limit（S/N=3）for cinchonine was 1.76×10-10 mol/L.The method was applied in the determination of cinchonine in serum with recoveries of 102.1%-109.5%.关键词：electrochemiluminescence;cinchonine;Ru（bpy）2+3;serum- 2318
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- 559
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- 0
发布时间：2023-05-18 - 摘要：The multi-walled carbon nanotubes-nafion film coated platinum electrode was prepared with multi-walled carbon nanotubes and nafion solution in the article.The structures of the multi-walled carbon nanotubes,nafion film,multi-walled carbon nanotubes-DMF film and multi-walled carbon nanotubes-nafion film were characterized by scanning electron microscopy（SEM）.The electrochemical behaviors of potassium ferricyanide at multi-walled carbon nanotubes-nafion flim modified electrodes were studied and compared with those at multi-walled carbon nanotubes-DMF modified electrodes and unmodified platinum electrode by cyclic voltammetry（CV）.The multi-walled carbon nanotubes-nafion film modified electrode exhibited a remarkable enhanced effect on the current response of potassium ferricyanide.A sharp reduction characteristic peak at 0.185 V was observed,and the intensity of peak increased 8.7 times as compared with that of unmodified platinum electrode.And the intensity of oxidizing characteristic peak at 0.231 V increased 2.7 times as compared with that of unmodified platinum electrode.The MWNTs surface has a big area,therefore,it could be used to enhance electronic transmission efficiency and improve the sensitivity.The studies also showed that the surface reaction of potassium ferricyanide at unmodified electrode is reversible reaction,but not at multi-walled carbon nanotubes-nafion film modified electrode.关键词：multi-walled carbon nanotubes;Nafion;modified electrode;cyclic voltammetric curve
- 2065
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- 517
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- 5
发布时间：2023-05-18 - 摘要：In order to establish a simple and rapid method for the determination of sophocarpine,the gold electrode modified with silica sol/Nano-Au/PVP was prepared,which could be used to detect sophoridine by ECL based on the obvious electrochemiluminescence sensitization effect of sophoridine on Ru(bpy)2+3.Under the optimum conditions,the ECL intensities presented a good linearity with concentration of sophoridine in the range of 1.6×10-7-1.6×10-4 mol/L,with a linear equation of I=4.000×107c+262.2(r2=0.994 5) and a detection limit(S/N=3) of 3.5×10-9 mol/L.RSD(n=6) for determination of 1.6×10-5 mol/L sophoridine was 2.9%.The proposed method showed a high selectivity,sensitivity and simplicity,and could be applied in the analysis of sophoridine with satisfactory results.关键词：electrochemiluminescence;Ru(bpy)2+3;silica sol;nano-Au;sophoridine
- 1983
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- 443
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- 1
发布时间：2023-05-18 - 摘要：A solid phase extraction coupled with high performance liquid chromatographic（HPLC） method was developed for the determination of trace amounts of mesotrione in water.The pH values of the samples were initially adjusted to 3.0-4.0 with phosphoric acid，and then enriched and purified with a C18 solid-phase extraction column.The mesotrione fraction was eluted with acetonitrile-water（1∶1） and then concentrated to 10 mL.Mesotrione was determined by HPLC equipped with a Thermo Hypersil-C18 column（250 mm×4.6 mm，5 μm），by using a mixture of acetonitrile-phosphoric acid solution（45∶55，pH 3.0） as mobile phase at a constant flow of 0.5 mL/min.The column temperature was set at 30 ℃ and the wavelength of ultraviolet（UV） detection was set at 233 nm.The experimental results showed that a good linear relationship（r＞0.999 7） between peak area and mesotrione concentration was obtained in the range of 0.4-20 μg?L-1.The method detection limit for mesotrione was 0.039 μg?L-1.The average recoveries were in the range of 90.3%-94.7% at spiked levels of 1，5,10 μg?L-1 with relative standard deviations of 3.5%-4.6%.The method was applied in the determination of trace amounts of mesotrione in surface water and wastewater with recoveries of 89.9%-93.2% at spiked amounts of 5 μg?L-1 and 10 μg?L-1.The method showed the advantages of simplicity， rapidness and sensitivity，and was suitable for the determination of trace amounts of mesotrione in water.关键词：mesotrione;solid phase extraction;high performance liquid chromatography（HPLC）;acetonitrile;water
- 2096
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- 610
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- 5
发布时间：2023-05-18 - 摘要：A method that utilizes activated carbon as a solid phase extraction was developed for the simultaneous preconcentration of eight trace heavy metals, including trace Zn(Ⅱ),Cd(Ⅱ),V(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Pb(Ⅱ),Mn(Ⅱ) and Cr(Ⅲ),prior to the measurement by microwave plasma torch-atomic emission spectrometry(MP-AES).Influences of some analytical parameters including pH value of sample,amount of adsorbent,flow rate and volume of sample,elution condition were optimized.Moreover,effects of foreign ions on recoveries of the determined elements were studied.The experiment showed that foreign ions did not influence recoveries of the determined elements.Under the optimized conditions,the detection limits for Zn(Ⅱ),Cd(Ⅱ),V(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Pb(Ⅱ),Mn(Ⅱ) and Cr(Ⅲ) were 0.45,0.35,0.25,0.06,0.40,0.25,0.20,0.20 μg?L-1,respectively.The relative standard deviations(n=8) for the determined elements(10 μg?L-1) were lower than 5%.The largest preconcentration factors were about 50 for V(Ⅲ),Pb(Ⅱ) and Cr(Ⅲ),and not less than 300 for the rest of heavy metals.The method was validated using a certified reference material,and was also applied successfully in the determination of eight heavy metals in natural waters.关键词：activated carbon;preconcentration;microwave plasma torch-atomic emission spectrometry;heavy metal
- 1884
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- 468
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- 6
发布时间：2023-05-18 - 摘要：Characteristic south China herbal medicine samples were digested by microwave system with nitric acid,and 17 kinds of elements,such as Al,As,Hg,Ca,Cu,Cr,Pb and Zn,etc in the digestion solutions were simultaneously analyzed by microwave plasma atomic emission spectrometry(MP-AES) with multi-mode sample introduction system(MSIS) under the optimized reductant concentration,to investigate the contents of these elements in south herbal medicines.Result showed that MP-AES had good detection limits for metal elements,and the analytical results of elements in two kinds of standard material were consistent with the analytical results of ICP-MS and the standard values,except for As,Hg,Sb and Se that were undetected.The detection limits of the method were 0.05-0.53 μg/g for the metal elements,and 0.93-5.40 μg/g for elements that could generate the vapor with hydride.In these south China herbal medicine samples,concentrations of Cd and Cu were below the limit values of Chinese Pharmacopoeia,contents of Cr and Pb exceeded the limits of European herbs,but the detection limits of As and Hg needed to decrease for quality control of herbs.The method could meet the analysis requirements of some elements in the south China herbal medicine because of its low detection limit,wide linear range,accuracy,rapid analysis and simultaneous multi-element analysis.关键词：MP-AES;vapor generation;South China herbal medicine;elements
- 2132
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- 579
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- 8
发布时间：2023-05-18 - 摘要：A high performance liquid chromatography- inductively coupled plasma mass spectrometric（HPLC-ICP-MS） method was established for the determination of chromium(Ⅲ) and chromium(Ⅵ) in children’s toys．By investigating pH value， mobile phase，flow rate， ICP-MS operating conditions and parameters，the detection limits of chromium(Ⅲ)and chromium(Ⅵ)(S/N=3) were obtained to be 0.024 mg/kg and 0.015 mg/kg，respectively，which could meet the requirements of the EN71-3 categoryⅠand category Ⅲ for determination of migratable chromium(Ⅲ)and chromium(Ⅵ) in children’s toys.The spiked recoveries varied from 85.4% to 119%，with relative standard deviations of 3.0 %-5.0 %．The proposed method was successfully applied in the determination of chromium(Ⅲ) and chromium(Ⅵ) in commercially available toys，including plastic children’s toys，stuffed children’s toy and paper children’s toys．The results demonstrated that the developed method was simple，rapid，sensitive and accurate.关键词：high performance liquid chromatography- inductively coupled plasma mass spectrometry(HPLC-ICP-MS);toy;chromium(Ⅲ);chromium(Ⅵ);EN71-3
- 2086
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- 476
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- 7
发布时间：2023-05-18 - 摘要：With the advantages of high selective discrimination,good stability and simple preparation, the molecular imprinted polymers(MIPs) can be modified on surface plasmon resonance sensors,in order to study the binding properties and interactions between molecules.The sensitivity of surface plasmon resonance(SPR) sensors,based on molecular imprinted technology(MIP-SPR),was improved a lot with applications of quantum dot and other nanomaterials like graphene,and therefore,promoting the application of this technology in the food safety analysis.In this paper,the preparation technologies,analysis principles and advantages of MIP-SPR sensors were briefly introduced,and its new applications in food safety were deeply analyzed.Finally,the development trends of MIP-SPR sensors were discussed.关键词：molecular imprinted;surface plasmon resonance(SPR);food safety
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发布时间：2023-05-18
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