JOURNAL OF CHROMATOGRAPHY A
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2018
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IF 3.716
Sijie Zheng,Man He,Beibei Chen,Bin Hu
A melamine-based porous organic polymer (mPMF) was synthesized as solid phase extraction (SPE) adsorbent for inline SPE-high performance liquid chromatography (HPLC)-ultraviolet detector (UV) analysis of five phytohormones. Melamine contributed to the rich π-electron and N-containing triazine structure for mPMF, which could form π-π interaction and intermolecular hydrogen bond with COOH containing phytohormones. The synthesized mPMF adsorbent shows extremely high extraction efficiency for five target analytes (>80%) including salicylic acid, indole-3-acetic acid, abscisic acid, 2,4-dichlorophenoxyacetic acid and 1-naphthalene acetic acid. The factors affecting extraction of the target phytohormones were investigated and the optimized experimental conditions were established. The linear range was 0.2–100 μg/L with the limits of detection in the range of 0.06–0.11 μg/L for five target phytohormones. The developed method of mPMF-inline-SPE-HPLC-UV was applied for the analysis of trace target phytohormones in tomato and grape juice samples, and the recovery in the range of 83.1–116% and 87.2–121% was obtained for the spiked tomato and grape juice, respectively. This method has the advantages of high sensitivity and good reproducibility, and it has good application potential for the analysis of phytohormones in fruit samples. Moreover, inline analysis avoided the problems of sample pollution and sample loss, and provided a sample throughput of 5/h.
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MICROCHIMICA ACTA
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2018
·Vol. 185
·期 7
·1-6
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IF 5.705
Cheng Ting,Jiao Zhijuan,Liu Xiaoyan,Zhang Haixia
A hybrid material was prepared from graphene oxide and melamine sponge, and modified with phenylboronic acid to obtain a sorbent for the enrichment of the nucleosides cytidine, uridine, inosine, guanosine and adenosine. The loading capacity typically is around 27.8 mg g −1 which is comparable to other sorbents, and highly selectivity for cis-diols is observed even if the concentration of potential interferents is 1500-fold higher. The sorbent was placed in an injector, and the process was operated semiautomatically by using a peristaltic pump. The sorbent is stable and can be re-used six times without decrease in efficiency. It was applied to the selective extraction of the cis -diols (cytidine, uridine, inosine, guanosine, adenosine) from HepG2 cells. It presents good linear between 3 to 5000 μg L −1 and the limits of detection (in HPLC analysis with UV detection) are 1–4 μg L −1 . Good recoveries of 85–101% were obtained with spiked HepG2 cells samples, with relative standard deviation of ≤9.9%.
Schematic for the preparation of boronic acid modified graphene oxide/melamine sponge composite for in-syringe solid-phase extraction of nucleosides.
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TALANTA
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2015
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IF 3.545
Junrong Li,Guannan Zhang,Lihua Wang,Aiguo Shen,Jiming Hu
In this work, we suggest a chitosan-modified popcorn-like Au–Ag nanoparticles (CSPNPs) based assay for high sensitive detection of melamine , in which CSPNPs not only provide with an intrinsic peroxidase-like activity but also act as surface enhanced Raman scattering (SERS) substrates. CSPNPs can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to the charge transfer complex (CTC), which contributes to a tremendous surface-enhanced resonant Raman scattering (SERRS) signals with 632.8 nm laser excitation. The target molecule melamine can generate an additional compound with H 2 O 2 , which means the available amount of H 2 O 2 for the oxidation of TMB reduced. Correspondingly, the SERRS intensity of CTC is decreased. The decreased Raman intensity is proportional to the concentration of melamine over a wide range from 10 nM to 50 μM ( R 2 =0.989), with a limit of detection (LOD) of 8.51 nM. Moreover, the proposed highly selective method is fully capable of rapid, separation-free detection of melamine in milk powder.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Na Li,Ting Liu,Shi Gang Liu,Shu Min Lin,Yu Zhu Fan,Hong Qun Luo,Nian Bing Li
Using carbon dots as the reductant and stabilizer, a visible and fluorescent method was developed for melamine detection in raw milk with one-step synthesized silver nanoparticles. In this work, carbon dots (C-dots) were applied to reduce silver ions and stabilize the nanoparticles, resulting in the formation of silver nanoparticles (AgNPs). As a result, the inherent fluorescence emission of C-dots was significantly reduced after the formation of AgNPs. However, in the presence of melamine, silver ions could interact with the nitrogen atoms in amine and triazine groups of melamine. With 0–2 μM melamine, aggregated AgNPs were found after the reduction by C-dots, resulting in color and absorbance changes. With further increase of melamine (2–20 μM), both formation and aggregation of AgNPs were inhibited, and the fluorescence was gradually increased. This optical platform was optimized for melamine detection and then was applied to detecting melamine in raw milk samples. The results for melamine assay based on visible and fluorescent method showed the requisite sensitivity with a low detection limit of 30 nM, as well as high selectivity.
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BIOSENSORS & BIOELECTRONICS
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2016
·
IF 7.476
Hanbing Rao,Min Chen,Hongwei Ge,Zhiwei Lu,Xin Liu,Ping Zou,Xianxiang Wang,Hua He,Xianyin Zeng,Yanying Wang
A novel molecularly imprinted electrochemical sensor for the rapid detection of melamine was reported in this paper. Glassy carbon electrode (GCE) was modified by Au and polyaniline composites (Au@PANI) deposited on the surface of GCE and were used to increase the electrode sensitivity and to amplify the sensor signal. Melamine template molecule was further assembled onto Au@PANI by the formation of hydrogen bonds , can implement the selective detection of melamine . This simple but efficient electrochemistry analysis platform presents a low detection limit of 1.39×10 −6 µmol L −1 for detection of melamine, which is remarkably lower than the currently used methods and the previous reports. So, this method may open a new way for the determination of melamine which enables low cost, effective and sensitive determination. This shows the sensor can be potentially utilized for the detection of melamine in food, which allows the sensitive and selective determination of melamine from milk and feed.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Jing Chen,Xiaokang Zhang,Li Zhang,Xiangzhan Jiang,Fei Xiao,Jinghui Hu,Jiawang Ding
The continuous increase in industrial organic pollutants has seriously contaminated the natural environment, posing a threat to natural ecosystems and human survival. The preparation of hydrophobic materials with corrosion resistance is crucial for the efficient treatment of emulsified oil–water mixtures in industrial wastewater. Octavinyl polyhedral oligomeric silsesquioxane-coated melamine foam (OV-POSS@MF), possessing hydrophobic properties, was synthesized through a two-step process: initially, a sulfhydryl layer was built up on the surface of the melamine foam, followed by the subsequent assembly of octavinyl POSS onto the melamine foam's surface via a free radical polymerization reaction between sulfhydryl groups and vinyl moieties. OV-POSS@MF achieves a static water contact angle of 141°, demonstrating its pronounced hydrophobic nature. Moreover, the corrosion resistance, adsorption capacity, oil–water separation efficiency, deformation resistance, and flame retardancy of OV-POSS@MF were thoroughly examined. The results indicate that OV-POSS@MF exhibits strong corrosion resistance and maintains good hydrophobicity even after prolonged exposure to highly acidic and alkaline conditions. Notably, OV-POSS@MF possesses the capability to efficiently and rapidly separate emulsified oil–water mixtures. Furthermore, it retains excellent hydrophobicity even after undergoing up to 100 consecutive compressions or distortions, highlighting its remarkable mechanical resilience. Additionally, OV-POSS@MF demonstrates superior flame retardant properties compared to unmodified melamine foam (MF).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yun Hu,Jingru Sun,Cuige Zhang,Chunmiao Xia,Liuyan Zhu,Maodong Xu,Rongli Zhang,Yinsheng Fang
Hollow carbon spheres (HCSs) have attracted broad attention in aqueous zinc-ion hybrid supercapacitors (ZIHSCs) owing to their distinctive properties. However, traditional methods for fabricating HCSs face limitations, including complex multistep procedures, the use of corrosive chemicals, and stringent reaction conditions. In this work, biomass-based poly(γ-glutamic acid)/Ni 2+ /melamine/chitosan nanoparticles were used as the precursors to fabricate N/O co-doped hollow graphite carbon spheres (HGCSs). Thanks to the appropriate hydrophilic characteristic, specific surface area, pore size distribution, and electrical conductivity, the fabricated HGCSs cathode exhibited superior electrochemical properties. The assembled HGCSs-based ZIHSCs device showed a satisfactory specific capacitance of 133.2 mAh·g −1 at a current density of 1.0 A·g −1 , high energy densities of 75.2 Wh·kg −1 at 10,000 W·kg −1 and 107.9 Wh·kg −1 at 1000 W·kg −1 , respectively. Additionally, the assembled HGCSs-based ZIHSCs device displayed an exceptional cycling stability, enduring up to 10,000 cycles at 0.5 A·g −1 with a capacity retention rate of 98.1 %. This work provides a facile and novel strategy to prepare superior electrochemical performance biomass-based HGCSs cathode for ZIHSCs.
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Desalination and Water Treatment
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2024
·
IF 1
Shifeng Li,Tiankuo Zang,Xiaoyun Yang,Min Xiao,Haibo Wang,Shuhua Yao,Zhongliang Shi
The utilization of waste melamine-formaldehyde foam to produce value-added carbon foam has been identified as a promising approach to polymer recycling. Nickel-Iron layered double hydroxides (NiFe-LDHs) and its complex oxides (NiFe 2 O 4 ) were synthesized in this study through a hydrothermal method, growing in situ on the above-mentioned carbon foam substrate. Comparative analysis revealed that CF@NiFe 2 O 4 exhibited superior removal efficiency compared to CF@NiFe-LDHs. Furthermore, arsenate adsorption on CF@NiFe-LDHs and CF@NiFe 2 O 4 conformed more to the pseudo-second-order model; meanwhile, the isothermal adsorption characteristic fitted the Langmuir isothermal model better. The negative ΔG (free energy changes, <−37.68 kJ/mol) and positive ΔH (enthalpy change, 7.64 kJ/mol) indicate that it is spontaneous and endothermic for As(V) to adsorb on CF@NiFe 2 O 4 . Potential mechanisms such as surface complexation, electrostatic interaction, and hydrogen bonding were suggested. This innovative approach offers a novel method for utilizing LDHs-based adsorption materials and recycling waste polymers.
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Food Bioscience
·
2024
·
IF 4.8
Baocheng Ji,Lanrui Yang,Mengxian Zhang,Peiyu Li,Zhuchen Hou,Jia Lv,Xu Xu,Wenbao Bi,Gaigai Xu,Yanhong Bai
In this study, a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method based on two kinds of silanized melamine sponges coupled with ultra-high liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) were developed for the determination of multiple pesticides and veterinary drugs in honey. Quick and convenient matrix separation could be achieved with the developed silanized melamine sponges by simply soaking and squeezing. At three spiked levels, all recoveries of the monitored drugs ranged from 63.6% to 114.8%, with relative standard deviations less than 17.7%. No significant matrix influence was observed with matrix effects within −13.9%∼+15.1% for all monitored drugs. Good linearity with correlation coefficient (R 2 ) ≥0.991 was obtained in the range of 0.08–100 μg kg −1 for most drugs. The limits of detection and quantification ranged from 0.04 to 3.6 μg⋅kg −1 and from 0.08 to 9.8 μg⋅kg −1 , respectively. The results had shown the satisfactory matrix purification performance of silanized melamine sponges and indicated its good application prospect in the multiple determination of pesticides and veterinary drugs in various foods.
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PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Mengfan Yan,Yiqun Fang,Chao Yan,Rurong Zhao,Fengqiang Wang,Zhijun Zhang,Jingjing Zhang,Yongming Song,Qingwen Wang
A novel transparent flame retardant coating was prepared using aqueous melamine formaldehyde resin (MF) as the film-forming resin and gas source, phosphoric acid-tannic acid (H 3 PO 4 -TA) as the acid and carbon source, and nano zinc oxide (nano-ZnO) as the flame retardant synergist. These coatings were applied to the surface of poplar wood panels to enhance the flame retardancy of wood. After complete drying and curing, the surface of the flame retardant coating was smooth and flat, with an overall light transmission rate exceeding 80 %, and the surface pattern of the wood was clear and visible. The large-plate combustion test showed that the maximum flame retardant time of the sample with 5 % ZnO reached 32 min. The cone calorimeter test showed that the ignition time of the 5 % nano zinc oxide sample increased from 8 s for the coated sample to 310 s, an increase of 3775 %. At the same time, the flame retardant coating, particularly with the addition of nano-ZnO, significantly reduced the heat release rate (HRR) and total heat release (THR) of the wood, demonstrating excellent flame retardant properties. After combustion, the carbon layer showed that the addition of nano zinc oxide increased the graphitization degree of the carbon layer, increased the expansion height of the carbon layer, and formed a denser carbon layer. In summary, this coating has a simple preparation method, low cost, outstanding flame retardant effect, and good transparency, making it a promising application prospects in the flame retardant field of wood products.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Xu Xu,Shiping Zhao,Ziling Zhang,Lanrui Yang,Wenhao Zhao,Baocheng Ji,Yanhong Bai
In this study, a facile and efficient pipette tip-integrated silanized melamine sponge device was developed for the rapid quantification of multi-pesticide residues in cowpea by ultra-performance liquid chromatography-tandem mass spectrometry. By embedding silanized melamine sponges within a pipette tip architecture, the device facilitates efficient matrix cleanup through simple aspiration-dispensing maneuvers, substantially simplifying sample pretreatment workflows. Comparative evaluations against conventional commercial adsorbents revealed that the proposed system exhibits comparable or enhanced purification performance. Method validation demonstrated that target analytes achieved recoveries spanning 81.0%-115.4% across three spiking concentrations, with intra- and inter-day precisions both below 15%. Additionally, excellent linearity (R²≥0.9985), negligible matrix effects (-18.3% to 19.8%), and low limits of detection (0.025-2.40 μg·kg⁻¹) and quantification (0.05-5.00 μg·kg⁻¹) were attained. These findings underscore the considerable potential of the developed purification device for pesticide multi-residue analysis in complex food matrices.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiongwei Wang,Peiyi Wu
Realizing high-efficiency thermal conductivity enhancement at low filler loading has a great significance for thermally conductive composite. Herein, three-dimensional (3D) boron nitride nanosheets (BNNSs) wrapped melamine foams (MF@BNNS) were first fabricated by repeated layer-by-layer (L-B-L) assembly using melamine skeleton as substrate and BNNSs as building blocks. The resultant MF@BNNS scaffold with order and interconnected BNNS layer, as a thermally conductive network, was further infiltrated with epoxy resin. As a consequence, a relatively high thermal conductivity of 0.6 W m −1 K −1 was achieved at an ultralow BNNS loading of ∼1.1 vol%, which is equivalent to a thermal conductivity enhancement of 233% compared to epoxy resin. Besides, the obtained epoxy composite also possesses a good mechanical property and excellent electrical insulativity. This method can be further extended to construct 3D filler network of other 2D layered materials on the melamine foam for high-performance composite.
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危险品化学品经营许可证（带存储）