TALANTA
·
2024
·
IF 5.6
Xueyun Wei,Zhuomin Zhang,Gongke Li
Aromatic disinfection by-products (DBPs) have garnered considerable interest in recent years for their potential carcinogenicity. However, efficient separation and enrichment of DBPs in complex samples is a challenge due to the extremely low content of aromatic DBPs and the complexity of sample matrices. In this study, a MIL-101(Cr)–NH 2 @TAPB-DVA-COF hybrid material was prepared as the enrichment medium of membrane solid-phase extraction (M-SPE) to efficiently determine trace emerging aromatic DBPs. This medium exhibited excellent enrichment capacity and selectivity for aromatic DBPs because of the strong hydrogen bonding, π-π stacking and hydrophobic interactions. An efficient analytical method for five aromatic DBPs in juice drinks was successfully established by use of this hybrid material as the enrichment medium for M-SPE in combination with liquid chromatography tandem mass spectrometry (LC-MS/MS). The limits of detection of the established method were from 0.50 to 3.00 ng/L. Moreover, the method had been successfully used in real juice drinks to determine trace five aromatic DBPs with the spiked recoveries ranging from 84.1% to 125%. The method possessed high analytical sensitivity and accuracy for these five aromatic DBPs in juice drinks with the aid of the efficient M-SPE technology proposed.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yun Wu,Yanqun Yang,Ming Wen,Jing Xie,Linchun Bao,Shuting Yang,Xiangming Luo,Xingyi Wang,Qianchun Zhang
Monoamine neurotransmitters play vital roles in cognitive and various physiological and pathophysiological processes, but their trace levels, small sample volumes, and complex biological matrices in biological samples pose significant analytical challenges. This study developed a novel method for the simultaneous quantification of six monoamine neurotransmitters—tyrosine, vanillylmandelic acid, tryptophan, 3,4-dihydroxyphenylacetic acid, 5-hydroxyindole-3-acetic acid, and homovanillic acid—in human serum and urine. The method utilizes magnetic solid-phase extraction coupled with ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). A multifunctional magnetic composite, polyethylenimine@polymer dopamine hydrochloride@NH 2 -MIL-53(Al)-SiO 2 @Fe 3 O 4 , was synthesized, exhibiting high extraction selectivity and capacity and achieving an extraction range of 9.61–25.4 nmol/mg for the target neurotransmitters. The analytical method, optimized for the aforementioned composite, exhibited robust linearity for all six monoamine neurotransmitters, with correlation coefficients ( R 2 ) exceeding 0.998. The limits of detection (S/N = 3) ranged from 1.1 to 22 ng/L, indicating high sensitivity. Recovery rates for the targeted analytes varied between 94.5 % and 112 %, and relative standard deviations remained within the range of 1.5–9.4 %. These findings confirm that the developed methodology is sensitive, accurate, selective, and reliable for the quantitative determination of trace monoamine neurotransmitters in complex biological samples.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 11
·1-10
·
IF 6.408
Fan Ru,Tian Jinrong,Wang Huili,Wang Xuedong,Zhou Peipei
By employing NH 2 -MIL-88 as a template, we synthesized the intermediate Fe@CN under high-temperature calcination and further fabricated the FeS 2 @CN nanocomposites in the presence of sulfur powder. Under varying temperatures (300–600 °C) and Fe@CN-to-S ratios (1:3–6), FeS 2 @CN 500-5 nanocomposites had the highest peroxidase-mimetic activity. Under optimized conditions (incubation temperature 40 °C; solution pH 4.0 and nanocomposite concentration 10 μg/mL; 652-nm absorption), the Michaelis-Menten constant ( K m ) of FeS 2 @CN was much lower than that of horseradish peroxidase (HRP), therefore demonstrating that it had a higher affinity for both chromogenic substrates than conventional HRP. The limits of detection for H 2 O 2 and glucose were 0.15 and 0.30 μmol/L, respectively, and the recoveries for glucose were 91.8–103% with RSDs <5.2%. The novelty of this study lies in (1) the FeS 2 @CN was confirmed to possess stronger enzyme-mimetic activity than its precursors (NH 2 -MIL-88 and Fe@CN); (2) the enhanced activity resulted from the unsaturated sites of N and S doping and the plentiful defects on the porous carbon surface; and (3) free radical trapping experiments evidenced that •OH played a major role in the catalytic reaction, while h + and •O 2 − simultaneously participated in the catalytic process. These convincing performance metrics lead us to postulate that the FeS 2 @CN-based colorimetric biosensor provides a promising approach for several real-world applications, such as point-of-care diagnosis and workplace health evaluations. Graphical abstract
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高影响因子
LANGMUIR
·
2023
·
IF 3.9
Suyun Wang,Yuanbo Fang,Wuli Han,Qiang Li,Xiao Luo
For the first time, MIL-100(Fe)-derived microspheres with a hollow structure were perfectly constructed and used as a photocatalyst to decompose organic dyes under visible light irradiation. The prepared MIL-100(Fe)-NH2(20) could boost the separation, migration, and transfer of photoinduced carriers effectively, together with efficient photocatalytic performance. In simulated sunlight, the MIL-100(Fe)-NH2(20) exhibits the best degradation efficiency as well as excellent reusability and stability, and the degradation rate for rhodamine B (RhB) can be more than 99.5% within 80 minutes. Structural analysis proves that the porous MIL-100(Fe)-NH2(20) catalyst reaps an amazing hollow structure, large specific surface areas (2784.9 m2·g–1), and uniform distribution of Fe and N active phases. Besides, the enhanced visible light response and lower recombination rate of e––h+ pairs are both confirmed, and the band gap is significantly reduced to 2.53 eV. Finally, the photocatalytic mechanism and the possible degradation pathway were suggested. Owing to the enhanced photocatalytic activity, good tolerance to pH and water quality, and excellent stability, the MIL-100(Fe)-NH2(20) catalyst can be potentially used in a wide range of dye wastewater purifications.
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高影响因子
TALANTA
·
2016
·
IF 4.035
Xialin Luo,Gongke Li,Yufei Hu
In this work, a novel NH 2 -MIL-53(Al) incorporated poly(styrene-divinylbenzene-methacrylic acid) (poly(St-DVB-MAA)) monolith was prepared via chemical fabrication. Moreover, it has been efficiently applied to the in-tube solid-phase microextraction (SPME) for online coupling with high-performance liquid chromatography (HPLC) to the direct determination of five estrogens in human urine samples. The NH 2 -MIL-53(Al)-polymer monolith was suitable for in-tube SPME owing to its good permeability, high extraction efficiency, chemical stability, good reproducibility and long lifetime. The extraction conditions including extraction solvent, pH of sample solution, flow rate of extraction and desorption, and desorption volume were investigated. Under the optimum conditions, the enrichment factors were 180–304 and saturated amounts of extraction were 2326–21393 pmol for estriol , 17β-estradiol, estrone , ethinyl estradiol and progesterone , respectively. The adsorption mechanism was also explored which contributed to its strong extraction to target compounds. The proposed method had low limit of detection (2.0–40 ng/L) and good linearity (with R 2 between 0.9908 and 0.9978). Four endogenous estrogens were detected in urine samples and the recoveries of all five analytes were ranged from 75.1–120% with relative standard deviations (RSDs) less than 8.7%. The results showed that the proposed online SPME-HPLC method based on NH 2 -MIL-53(Al)-polymer monolithic column was highly sensitive for directly monitoring trace amount of estrogens in human urine sample.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Shijie Xing,Zhikun Li,Jiaxiang Liu,Wei Zhang,Fuqiang Sun,Shu-Xuan Liang
To address the ongoing issue of quinolones (QNs) residues in aquatic products, accurate and sensitive detection of trace QNs has always been necessary and urgent. In this work, a composite material of NH 2 −MIL-125(Ti)@TpBD(SO 3 H) 2 consisting of metal organic frameworks and based on bisulfonic acid-based covalent organic frameworks was synthesized and applied as a dispersive solid-phase extraction (dSPE) adsorbent. Combining with liquid chromatography-tandem mass spectrometry, a simple and effective method for simultaneous detection of 18 QNs in aquatic products was established. Meanwhile, the selective adsorption mechanism was thoroughly investigated through material characterization combined with density functional theory calculations. The results showed that the method had a good linear relationship ( r ≥ 0.9981), low limits of detection of 0.0019–0.0641 μg kg⁻¹, along with high recovery rates in the range of 80.6–113.2 %, and good precision with relative standard deviations less than 8.8 %. The selective adsorption mechanism revealed the synergistic adsorption mechanism of electrostatic interactions, hydrogen bonding, and π-π interactions. The material had good reusability and excellent stability. In summary, the dSPE method based on NH 2 −MIL-125(Ti)@TpBD(SO 3 H) 2 composites provided a practical sample pretreatment solution for the determination of trace QNs in complex matrixes.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Dongxue Fan,Kai Cui,Yang Li,Caiqin Miao,Qun Wang,Xiaohong Wu
Flexible perovskite solar cells (F-PSCs) have demonstrated remarkable potential for next-generation wearable platforms. Nonetheless, the reduction of open-circuit voltage (VOC) at the interface within F-PSCs poses a significant barrier to improving the photoelectric conversion efficiency (PCE). Herein, we reported an effective “two birds with one stone” strategy by utilizing carbon dots (CDs) as a multifunctional treatment modulator to modify the SnO2 electron transport layer (ETL) and buried interface. On the one hand, CDs were explored to passivate trap states associated with Sn dangling bonds and oxygen vacancies on SnO2 surfaces through Lewis acid–base coordination, thereby enhancing the electron mobility of SnO2 films and facilitating charge extraction from perovskite layers. On the other hand, the functional groups (including carboxyl, fluorine, and amino) on CDs enable the formation of coordination and hydrogen bonding with PbI2, promoting the formation of high-quality perovskite films with reduced defect densities. The collective enhancements effectively mitigate trap-assisted charge recombination and interfacial energy loss, significantly reducing the device voltage deficit and enabling F-PSCs to attain a PCE of 22.97% with enhanced VOC from 1.06 to 1.18 V. Notably, CDs-incorporated devices demonstrate exceptional operational durability, maintaining 83% of initial PCE after 400 h of continuous illumination (AM 1.5G) in an air atmosphere and retaining 81% PCE following 4000 cyclic bending tests (6 mm radius). This methodology establishes a robust framework for simultaneously enhancing both the efficiency and stability in FAPbI3-based F-PSCs.
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高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Junxue Liu,Yufei Wang,Mingqin He,Xiaohong Chen,Chenyu Zhou,Jiyang Li
Determination of glucose and maltose is crucial for food production and human health. Herein, a novel Au/CD@MIL-53(Fe)-NH 2 self-cascade nanozyme was constructed via host–guest assembly with “three-in-one” features, including blue fluorescence, H 2 O 2 production as an oxidase mimic, and •OH generation as a peroxidase mimic. Theoretical and experimental results proved that the incorporation of carbon dots renders the composite with high peroxidase-like activity and extremely high affinity for H 2 O 2 (K m : 0.011 mM), 336 times higher than that of the natural enzyme. The self-cascade catalytic process could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue ox-TMB, which further quenched the fluorescence and produced a photothermal effect. Consequently, colorimetric/fluorescence/photothermal-based multimodal detection of glucose and maltose was first achieved, obtaining low detection limits of 12/7.5/1.1 and 18/11.3/1.4 μM, respectively. This study offers a promising strategy for designing efficient nanozyme-based cascade systems that help enhance food quality determination.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Liang Yutao,He Juan,Huang Zhipeng,Li Huayu,Zhang Yunxia,Wang Huige,Rui Chaofan,Li Yuanyuan,You Liqin,Li Kai,Zhang Shusheng
A surface imprinted polymer of type UiO-66-NH2@MIP was prepared by combining molecular imprinted polymers (MIPs) and an amino-functionalized zirconium-based metal-organic framework. Quercetin is used as the virtual template, UiO-66-NH 2 acts as the carrier to which the monomer acrylamide can be copolymerized. The material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. It was used as a sorbent in a solid-phase extraction column. The extraction conditions were optimized. The adsorption capacities for aflatoxins AFB1, AFB2, AFG1 and AFG2 by this SPE and by the commercial SPE were compared. The method was successfully applied to quantify the aflatoxins in grain. Figures of merit include (a) good linearity (range from 0.20–45 μg·kg −1 ) with R 2 (range from 0.9986–0.9994), (b) low detection limits (90–130 ng·kg −1 ), (c) acceptable reproducibility (1.0–5.9%; for n = 6), and (d) relatively satisfactory recovery rates (74.3–98.6%). The new sorbent has good selectivity and reusability.
UiO-66-NH 2 @MIPs were synthesized with modified UIO-66-NH 2 as core and quercetin as pseudo template. A cartridge was prepared with the polymers as the sorbent, and its performance was compared with different commercial SPE cartridges.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Ma,Wei Zhong,Langlang You,Yi Pei,Chunxin Lu,Zhiyin Xiao,Zhongquan Shen,Xiujuan Jiang,Nianlong Qian,Xiaoming Liu,Shuhua Zhang
In this work, three materials of Cu-Cu 2 O/rGO-NH 2 -4.4/1, -1/1 and -1/10.4, in which the numeric suffices denote the ratio of Cu/Cu 2 O in the materials, were described and characterized using various analytical techniques including FTIR, XRD, SEM, HRTEM, XPS and Raman spectroscopy. To probe the band structures of these materials, UPS, cyclic voltammetry, and UV–vis reflection spectroscopy were also employed. The formation of heterojunctions in the ternary materials tune their band structures by raising the energy level of valence band maximums (VBMs), inducing an internal electric field (IEF) and an electron accumulation layer (EAL) within the materials. Augment of copper content in the materials can enhance the energy level rising. The coordination of N-methylimidazole (NMI) with Cu 2 O of the materials can also contribute to raising the energy level. The changes in these electronic properties bring about a synergistic effect in selective aerobic oxidation of benzylic alcohols via improving O 2 activation and facilitation of electron transfer between the catalyst and the reactants due to the rising of the energy level of VBM and the formation of IEF.
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