MICROCHIMICA ACTA
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2022
·Vol. 189
·期 11
·1-8
·
IF 6.408
Li Shuhuai,Wu Yuwei,Pang Chaohai,Ma Xionghui,Wang Mingyue,Luo Jinhui,Zhi Xu,Li Bei
A highly sensitive kanamycin electrochemiluminescence (ECL) switch sensor was constructed. A signal element consisting of ordered mesoporous carbon loaded with indium oxide nanoparticles/carbon quantum dots (OMC/In 2 O 3 /C-dots) was assembled on the surface of a gold electrode. Then, a molecularly imprinted polymer (MIP) was prepared on the modified electrode surface using kanamycin as the template molecule and o -aminophenol as the functional monomer. After kanamycin elution, the prepared sensor retained specific kanamycin recognition sites. OMC/In 2 O 3 effectively amplified the ECL signal of the C-dots, thereby enhancing the detection sensitivity, whereas kanamycin quenched the signal. Therefore, the imprinted sites acted as a switch, providing a new method for detecting kanamycin. Under the optimal experimental conditions, the concentration of kanamycin was proportional to the degree of ECL quenching within a linear range of 5–4500 × 10 −12 mol L −1 at 0.8 V (vs. Ag/AgCl electrode electrode), and the detection limit was 5.8 × 10 −13 mol L −1 . When applied to the detection of kanamycin in actual samples, such as chicken, duck, pork, and milk, the recovery for spiked samples was in the range 92.7–110%. Graphical abstract
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22778-22785
·
IF 3.925
Xiaozhi Li,Jutao Qiao,Dan Luo,Siyi Xu,Yuefeng Liu,Hao Liu
In this study, Ni nanoparticles were grown on a silver-coated nylon yarn (SCNY) surface by electrochemical deposition to prepare SCNY@Ni. The hierarchical Ni–Ag nanostructure promoted their synergistic effect, which enhanced the electrocatalytic behavior of glucose oxidation. The test result of SCNY@Ni showed its high sensitivity (115.26 μA mM−1 cm−2 and 67.37 μA mM−1 cm−2) with a wide linear response (from 2 μM to 1 mM and from 1 mM to 22 mM) of glucose con-centration range, a low detection limit (LOD) of 2 μM, fast response time (3 s), and good selectivity for glucose determination in the presence of sucrose (SU), aceta-mino phenol (AP), D-fructose (D-Fru), ascorbic acid (AA), dopamine (DA), hydro-quinone (HQ) and uric acid (UA) as potential interference species. Also, SCNY@Ni exhibited excellent stability, repeatability, reproducibility and flexibility. It has good prospects for large-scale production.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yunhao Li,Shuhao Wang,HengYu Li,Dandan Liu,Yan Jin,Guodong Kang,Yiming Cao
Lithium extraction from salt-lake brine with a high Mg 2+ /Li + ratio is crucial for mitigating lithium supply shortage. Positively charged polyamide nanofiltration membranes, which are often prepared by performing interfacial polymerization (IP) using polyethyleneimine and trimesoyl chloride, are considered to be promising candidates for Mg 2+ /Li + separation owing to their high energy efficiency and low environmental impact. However, the performance of these membranes is severely hindered by “useless pores” and “defects” present in the flexible polyamide layer. Herein, we provide a facile strategy for modifying flexible semi-aromatic polyamide chains by intercalating a rigid electropositive monomer, histamine, to remold the internal pores and positive charge density at a molecular level. Two routes, namely, “swelling-embedding-reacting-shrinking (SERS)” and “in-situ interposition (SIP)” were used to construct a new polyamide layer with rigid–flexible microstructures. The fabricated SERS-0.50 membrane showed a 5-fold higher water flux and 2-fold increase in the Mg 2+ /Li + separation factor compared with the IP membrane. Moreover, the SIP-0.15 membrane with an enhanced positive charge density exhibited a considerably higher Mg 2+ /Li + separation factor (15.38, 500 % increase compared with that of the IP membrane) for brine with a Mg 2+ /Li + ratio of 20. This study provides a reference for developing nanofiltration membranes used for high-efficiency Mg 2+ /Li + separation.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Ju Jian,Zhang Xinyu,Li Lin,Regmi Sagar,Yang Guoqiang,Tang Shixing
Understanding the dynamic changes in antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is essential for evaluating the effectiveness of the vaccine and the stage for the recovery of the COVID-19 disease. A rapid and accurate method for the detection of SARS-CoV-2-specific antibodies is still urgently needed. Here, we developed a novel fluorescent lateral flow immunoassay (LFA) platform for the detection of SARS-CoV-2-specific IgM and IgG by the aggregation-induced emission carbon dots conjugated with the SARS-CoV-2 spike protein (SSP). The aggregation-induced emission carbon dots (AIE-CDs) are one of the best prospect fluorescent probe materials for exhibiting high emission efficiency in both aggregate and solid states. The AIE-CDs were synthesized and displayed dual fluorescence emission, which provides a new perspective for the design of a high sensitivity testing system. In this work, the novel LFA platform adopted the AIE carbon dots, which are used to detect SARS-CoV-2-specific IgM and IgG conveniently. Furthermore, this sensor had a low LOD of 100 pg/ml. Therefore, this newly developed strategy has potential applications in the areas of public health for the advancement of clinical research.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Die Deng,Shaohua Wen,Ya Wang,Jia Liu,Fang Li,Xiupei Yang
Cerium dioxide (CeO 2 ) has usually been used as a catalyst for colorimetric assays. However, the low catalytic efficiency has limited their further application. Covalent organic frameworks (COFs) have sparked increasing interest in the unique properties of large surface area, high porosity, and good thermochemical stability. Herein, a novel covalent organic framework composite (TpPa@CeO 2 ) with dual mimic enzyme activities (oxidase and peroxidase) was successfully synthesized via a facile hydrothermal method. TpPa@CeO 2 showed higher catalytic activity than CeO 2 . The excellent catalytic performance of TpPa@CeO 2 could be attributed to the higher surface area, more surface active species and higher Ce 3+ /Ce 4+ ratio in the composite than CeO 2 . Based on this, a visual and sensitive colorimetric sensor was constructed to detect ascorbic acid (AA) in the linear range of 0.2–35 μM with a low detection limit (LOD) of 0.061 μM. Moreover, the excellent colorimetric sensor was successfully applied to detect AA in beverage and tablet samples with satisfactory recoveries ranging from 95.78 % to 100.84 %. The catalytic mechanism could be that the composition of TpPa and CeO 2 improved the ratio of Ce 3+ /Ce 4+ , which promoted the decomposition of dissolved oxygen and H 2 O 2 by CeO 2 to produce superoxide radicals (·O 2 – ) and hydroxyl radicals (·OH), respectively. The facile and sensitive sensor system constructed by TpPa@CeO 2 with promising applications provides a new platform for the detection of AA in real sample analysis.
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DESALINATION
·
2022
·
IF 11.211
Zhongbao Ma,Long-Fei Ren,Diwen Ying,Jinping Jia,Jiahui Shao
Thin-film composite polyamide (TFC-PA) nanofiltration membrane is promising in heavy metal removal due to its excellent performance and high economic benefits. However, the common interfacial polymerization (IP) fabrication method requires abundant toxic and harmful solvents, causing harm to the environment and humans. Therefore, novel green, low-carbon and sustainable fabrication methods are urgently needed. Here, we reported a sustainable electrospray polymerization (SEP) technique for TFC-PA membrane preparation via electrospray featuring no toxic solvent, near-complete monomer conversion , and zero waste liquid discharge. In this process, 2-methyl-tetrahydrofuran and ethanol were used as green solvents, and its greenness was assessed by green metrics and toxicity bioassays. Physical features and physicochemical properties of SEP membranes were characterized by SEM, TEM, AFM and XPS. Membranes with different surface charges and pore sizes could be tailored by varying the monomer concentration . The optimal membrane exhibited excellent removal efficiency of toxic heavy metal ions , in which the rejection rates of Cu 2+ and Ni 2+ were higher than 97.0 %. In addition, the permeability and salt rejection of SEP membranes were better than those of IP membranes. Our sustainable electrospray polymerization method provides a versatile green platform for fabricating TFC membranes and may facilitate the development of sustainable nanofiltration membranes.
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Nanomaterials
·
2022
·Vol. 12
·期 12
·2094
·
IF 5.719
Hongming Liu,Qin Zhou,Yongfu Lian
Individual single–walled carbon nanotubes (SWNTs) with distinct electronic types are crucial for the fabrication of SWNTs–based electronic and magnetic devices. Herein, the water–soluble polymethyl(1–butyric acidyl)silane (BA–PMS) was synthesized via the hydrosilylation reaction between 3–butenoic acid and polymethylsilane catalyzed by 2,2′–azodibutyronitrile. As a new dispersant, BA–PMS displayed a quite good dispersing capacity to arc–discharged SWNTs and moderate selectivity for metallic species. The application of sucrose–DGU, the density gradient ultracentrifugation with sucrose as the gradient medium, to the co–surfactants (BA–PMS and sodium dodecyl sulfonate) individually dispersed SWNTs yielded metallic SWNTs of 85.6% purity and semiconducting SWNTs of 99% purity, respectively. This work paves a path to the DGU separation of the SWNTs dispersed by polymer–based dispersants with hydrophobic alkyl chains.Keywords:polymethyl(1–butyric acidyl)silane;dispersion;density gradient ultracentrifugation
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Feng,Gang Lang,Tingting Li,Jing Zhang,Jun Zhao,Wei Li,Weiqing Yang,Zhenju Jiang
Coordination-driven self-assembly has emerged as a smart strategy to prepare advanced materials for various applications. Here we coat Ni(II)-tannic acid complexes on the lab-made C-Cr 2 O 3 nanoparticles by this strategy, and demonstrate that this novel coating dramatically accelerate the charge transfer and thus enhance the amperometric responses for electrochemical detection of glucose and hydrazine. The charge-transfer rate ( k s ) of the obtained C-Cr 2 O 3 @Ni-MPN is much higher than that of C-Cr 2 O 3 substrate, evaluated as 1.00 and 0.82 s −1 respectively. The physicochemical and electrochemical characterizations demonstrate that the enhanced k s of C-Cr 2 O 3 @Ni-MPN is attributed to the electronegativity and the network structure of its surface. Correspondingly, C-Cr 2 O 3 @Ni-MPN exhibits superior sensitivity (5043.3 μA mM −1 cm −2 ) and ultra-low detection limit (0.02 μM) for the glucose detection, as well as high sensitivity (918.5 μA mM −1 cm −2 ) and ultra-low detection limit (0.04 μM) for the hydrazine detection. Furthermore, C-Cr 2 O 3 @Ni-MPN exhibits the excellent selectivity, stability and reproducibility, and the powerful reliability for analyzing the plasma samples. This study constructs an appropriate hierarchical structure towards catalyzing the electrochemical oxidation of targets, which achieves the amplification of the respond current and thus an ultra-sensitive electrochemical detection for the targets.
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Analytical Methods
·
2022
·Vol. 14
·期 37
·3632-3637
·
IF 3.532
Zhi-Ang Liu,Ya-Nan Zuo,Yinghui Xia,Jing Sun,Shuyun Zhu
An innovative strategy with target-triggered cascade fluorescence recovery of a dual-nanoquencher system was developed to detect ascorbic acid (AA). Herein, manganese dioxide (MnO2) nanosheets and gold nanoparticles (AuNPs) were used as nanoquenchers simultaneously. Owing to their synergistic effects, the fluorescence of 2,3-diaminophenazine (DAP) was decreased efficiently, thus minimizing the background fluorescence. The introduction of AA triggered the decomposition of MnO2 into Mn2+, which induced the aggregation of AuNPs. Both the decomposed MnO2 and aggregated AuNPs possess weak quenching abilities towards DAP. Such a cascade amplification strategy enhanced the detection sensitivity for AA with a LOD as low as 6.7 nM, which was two orders of magnitude lower than that of MnO2-based fluorescence assay. Furthermore, this amplification strategy was successfully applied to detect AA in food samples.
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AICHE JOURNAL
·
2022
·Vol. 68
·期 10
·e17827
·
IF 4.167
Jinzhe Cao,Jiangwei Zhang,Shengyang Tao
5-(Hydroxymethyl)furfural (5-HMF) is a vital platform molecule from which a variety of high-value-added fine chemicals and polymerizable monomers can be prepared. The use of solid acids to catalyze the conversion of biomass into 5-HMF is environmentally friendly and economical. However, exploiting the high yield of 5-HMF in a highly concentrated reactant system is challenging. Herein, we present a laser-assisted method for preparing highly acidic monolithic acidic catalysts. A monolithic acidic catalyst based on metal Zr sheets was synthesized and used to catalytically convert 30 wt% fructose into 5-HMF (conversion rate: 96%; yield: 95%). The catalyst was immediately separated from the reaction solution by direct removal at the end of the reaction. Catalytic efficiency was largely unaffected after 10 cycles of use, and the same catalytic efficiency was observed after laser-regeneration, highlighting the potential industrial applicability of the developed catalyst.
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Nutrients
·
2022
·Vol. 14
·期 13
·2765
·
IF 6.706
Xuejiao Zhang,Bowei Zhang,Bo Peng,Jin Wang,Yaozhong Hu,Ruican Wang,Shuo Wang
Sugar reduction and sugar control are advocated and gaining popularity around the world. Sucrose, as the widely consumed ingredient in our daily diet, has been reported a relation to gastrointestinal diseases. However, the role of sucrose in inflammatory bowel disease remains controversial. Hence, our study aimed to elucidate the potential role of three doses of sucrose on DSS-induced colitis in C57BL/6 mice and the underlying mechanisms. The results showed that low-dose sucrose intervention alleviated colitis in mice, reducing the expression of inflammatory cytokines and repairing mucosal damages. In contrast, high-dose sucrose intervention exacerbated colitis. Furthermore, three doses of sucrose administration markedly altered gut microbiota composition. Notably, the low-dose sucrose restored microbial dysfunction and enhanced the production of short chain fatty acids (SCFAs). Specifically, the abundance of SCFAs-producing bacteriaFaecalibaculum,Bacteroides,andRomboutsiawere increased significantly in the LOW group. Consistently, PPAR-γ, activated by SCFAs, was elevated in the LOW group, thereby inhibiting the MAPK/NF-κB pathway. Together, our study demonstrates the differential effects of sucrose on colitis at different doses, providing a scientific basis for measuring and modifying the safe intake level of sugar and providing favorable evidence for implementing sugar reduction policies.Keywords:sucrose;gut microbiota;SCFAs;PPAR-γ;MAPK/NF-κB
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Foods
·
2022
·Vol. 11
·期 13
·1920
·
IF 5.561
Qi Quan,Wei Liu,Jiajing Guo,Meiling Ye,Juhua Zhang
Six lactic acid bacteria strains were used to study the effects on physicochemical characteristics, antioxidant activities and sensory properties of fermented orange juices. All strains exhibited good growth in orange juice. Of these fermentations, some bioactive compositions (e.g., vitamin C, shikimic acid) and aroma-active compounds (e.g., linalool, 3-carene, ethyl 3-hydroxyhexanoate, etc.) significantly increased inLactiplantibacillus plantarumandLactobacillus acidophilussamples. DPPH free radical scavenging rates inL. plantarumandLacticaseibacillus paracaseisamples increased to 80.25% and 77.83%, respectively. Forty-three volatile profiles were identified, including 28 aroma-active compounds. 7 key factors significantly influencing sensory flavors of the juices were revealed, including D-limonene, linalool, ethyl butyrate, ethanol,β-caryophyllene, organic acids and SSC/TA ratio. The orange juice fermented byL. paracasei, with more optimization aroma-active compounds such as D-limonene,β-caryophyllene, terpinolene andβ-myrcene, exhibited more desirable aroma flavors such as orange-like, green, woody and lilac incense, and gained the highest sensory score. Generally,L. paracaseifermentation presented better aroma flavors and overall acceptability, meanwhile enhancing antioxidant activities.Keywords:orange juice;lactic acid fermentation;physicochemical characteristics;antioxidant activities;volatile profiles;sensory properties
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