Journal of Food Measurement and Characterization
·
2021
·Vol. 16
·期 1
·753-761
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IF 2.431
Luo Yifeng,Dai Liyu,Jiang Xu,Fu Xiaping
In response to the research demand in spatial frequency domain techniques at continuous wavelengths in the field of agricultural and food products, a line scan hyperspectral spatial frequency domain combined imaging (LSH-SFDI) system was developed for quantitative hyperspectral optical imaging in the spatial frequency domain for detecting absorption ( μ a ) and reduced scattering ( μ′ s ) parameters of tissues in the continuous spectral range. Systematic calibration of the LSH-SFDI system was performed using the configured liquid phantoms, and the average errors of μ a and μ′ s at 56 wavelength bands between 450 and 740 nm were obtained as 9.24% and 6.08%, respectively. The optical parameters of milk were measured using the LSH-SFDI system, and the μ a and μ′ s values of milk samples at continuous wavelengths were analyzed by linear regression with the fat and protein contents of the corresponding milk, and the final results verified the correlation between the fat content and μ′ s and the protein content and μ a of milk. The developed system can be further used for milk quality evaluation and classification subsequently, as well as for other agricultural products and foods.
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高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 12
·2111-2117
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IF 9.445
Qi Zhikai,Chen Yali,Gao Huizhi,Zhang Fu-Qiang,Li Shi-Li,Zhang Xian-Ming
Metal halide perovskites based on MX 6 (M is metal and X is halogen) octahedra have developed into significant materials, extensively used in many fields, such as solid-state lighting, semiconductor, and nonlinear optics. However, the MX 5 square pyramid-based hybrid metal halides beyond zero-dimensional (0D) polyhedrons and clusters are rarely reported. Herein, we reported two new isostructural hybrid antimony halides, namely (2cepyH)SbCl 4 ( 1 -Cl) and (2cepyH)SbBr 4 ( 2 -Br) (2cepy = 1-(2-chloroethyl)pyrrolidine), characterized by 1D polar polyanionic chains formed by corner-sharing SbX 5 tetragonal pyramid units. Upon photoexcitation at 340 nm, 1 -Cl shows broad, yellow phosphorescence emissions stemming from triplet self-trapped excitons, as proved by its long lifetime (6.85 μs) and the temperature dependences of broadband emission. To our knowledge, this should be the first observation on the broadband emissive properties in the 1D hybrid metal halide constructed by MX 5 tetragonal pyramid units. Moreover, second harmonic generation measurements show that the nonlinear optical properties of 2 -Br (∼3.2 × KDP) are superior to that of 1 -Cl (∼1.8 × KDP). Experimental and calculated data indicate that the bandgap of 1 -Cl is larger than that of 2 -Br and that the polar inorganic moieties determine their band structures. Our work opens up a new way for constructing broadband emission materials with novel polar frameworks.
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CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 12
·1141-1150
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IF 2.044
Chen Guo-Ying,Zhang Hao,Zhang Chun-Yan,Wang Yuan,Zhao Cong-Peng,Chen Hua,Yang Feng-Qing,Hu Yuan-Jia
In this study, an online capillary electrophoresis-based immobilized enzyme microreactor (CE-IMER) was developed for evaluating inhibitory activity of small-molecule compounds and tea polyphenol extracts on kallikrein (KLK). KLK was immobilized on the inner wall at the inlet of capillary to prepare the KLK-IMER with the aid of chitosan and glutaraldehyde. The immobilized KLK activity and other kinetic parameters were evaluated by measuring the peak area of hydrolysate of chromogenic substrate S-2302 (H-D-Pro-Phe-Arg-pNA). The Michaelis–Menten constant ( K m ) was determined to be 1.82 mM, and the half-maximal inhibitory concentration (IC 50 ) and inhibition constant ( K i ) of nicotinamide (positive control drug) were measured to be 12.07 and 4.31 mM, respectively. The negative control drug tinidazole (5.00 mM) had no inhibitory effect on KLK. Moreover, the activity of the immobilized KLK remained approximately 80.0% of the initial immobilized enzyme activity after 30 runs. The CE-IMER was applied to investigate the inhibitory activity of 10 small-molecule compounds and six tea polyphenol extracts on KLK. The results show that four small-molecule compounds (epicatechin gallate, epigallocatechin, epicatechin and isochlorogenic acid C) (0.25 mM) and six polyphenol extracts (Raw Pu-erh, Mingqian Mao Feng, Fuding white tea, Dark green tea, Biluochun and Black tea) (0.25 mg mL −1 ) have high inhibitory activity on KLK. In addition, these four small-molecule compounds have binding energies below − 5.0 kcal mol −1 on KLK according to the molecular docking. In short, this study reports a time saving method (0.75 h) for KLK immobilization under mild conditions (25 °C). Graphic abstract
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Journal of Bionic Engineering
·
2021
·Vol. 18
·期 5
·1168-1178
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IF 2.682
Liao Chenchen,Xia Yurou,Keshen A. Yinaer Nu,Dai Boya,Zhao Song’an,Hu Ziqing,Zheng Zaihang,Liu Yan
Inspired by nature, a superhydrophobic and magnetic melamine sponge (BFSM-MF) was fabricated by a one-step dip-coating method. Aiming at replacing nano-Fe 3 O 4 particles with a complex preparation process and high cost, the commercial and cheap Fe 3 O 4 originated from magnetite was employed as a magnetic substance. To acquire superhydrophobicity, the hierarchical mirco/nano-sized structure with low surface energy was mainly contributed by bonding hydrophobic Fe 3 O 4 and graphene with silicone resin onto the surface of the melamine sponge. The results demonstrated that the water and oil static contact angle values of BFSM-MF were 160° and 0°, revealing that BFSM-MF was superhydrophobic and super-oleophilic. Moreover, the self-cleaning ability, magnetic-driven oil absorption ability and continuous oil–water separation performance of BFSM-MF have also been evaluated. As expected, BFSM-MF possessed magnetic-driven oil absorption ability and the oil–water separation efficiency for light oil reaches 98% ± 1%. In addition, the adsorption capacity and recycling performance of different organic solvents were systematically investigated. Therefore, the development of biomimetic, fluorine-free and superhydrophobic foam with magnetic-driven effect has potential application value in marine oil spill treatment and separation of domestic oil pollution.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26465-26479
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IF 2.478
Zhu Wanrong,Song Jimei,Wang Xule,Lu Yun,Hu Gang,Yang Jie
A series of Ag/AgBr/BiOBr photocatalysts with different weight contents of Ag/AgBr were successfully constructed via a simple precipitation method in 80 °C water bath. Photocatalysts were characterized by XRD, XPS, SEM, TEM, N 2 Adsorption-Desorption (BET), and UV–Vis Diffuse Reflectance Spectroscopy (DRS). Compared with BiOBr and Ag/AgBr, all the composite photocatalysts show the prominent photocatalytic activity for the degradation of tetracycline (TC). Especially, 1:5Ag/AgBr/BiOBr (20%) has the highest reaction rate constant (kapp = 0.20 min −1 ). Moreover, according to the results of radical scavengers runs, ·OH and h + acted as the main reactive species in the degradation process. Based on above, a possible photocatalytic mechanism for organics degradation over Ag/AgBr/BiOBr was proposed. Interestingly, the redox cycle between O 2 /·O 2 − and Br − /Br 0 assisted with the surface plasmon resonance (SPR) effect of silver dramatically promotes the separation and transfer of electron–hole pairs, and improves the photocatalytic activity of the as-obtained composite samples.
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Nature Protocols
·
2021
·Vol. 16
·期 7
·3522-3546
·
IF 13.491
Liu Jia,He Hui,Xie Dan,Wen Yanrong,Liu Zhen
Cellular heterogeneity is pervasive and of paramount importance in biology. Single-cell analysis techniques are indispensable for understanding the heterogeneity and functions of cells. Low-copy-number proteins (fewer than 1,000 molecules per cell) perform multiple crucial functions such as gene expression, cellular metabolism and cell signaling. The expression level of low-copy-number proteins of individual cells provides key information for the in-depth understanding of biological processes and diseases. However, the quantitative analysis of low-copy-number proteins in a single cell still remains challenging. To overcome this, we developed an approach called single-cell plasmonic immunosandwich assay (scPISA) for the quantitative measurement of low-copy-number proteins in single living cells. scPISA combines in vivo microextraction for specific enrichment of target proteins from cells and a state-of-the-art technique called plasmon-enhanced Raman scattering for ultrasensitive detection of low-copy-number proteins. Plasmon-enhanced Raman scattering detection relies on the plasmonic coupling effect (hot-spot) between silver-based plasmonic nanotags and a gold-based extraction microprobe, which dramatically enhances the signal intensity of the surface-enhanced Raman scattering of the nanotags and thereby enables sensitivity at the single-molecule level. scPISA is a straightforward and minimally invasive technique, taking only ~6–15 min (from in vivo extraction to Raman spectrum readout). It is generally applicable to all freely floating intracellular proteins provided that appropriate antibodies or alternatives (for example, molecularly imprinted polymers or aptamers) are available. The entire protocol takes ~4–7 d to complete, including material fabrication, single-cell manipulation, protein labeling, signal acquisition and data analysis.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·159-172
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IF 5.693
Liu Ming-Ju,Li Ping,Meng Qing-Wei,Ge Qingchun
Low permeation flux and rapid flux decline are challenging membrane technology in wastewater treatment. Here we used a metal–ligand complexation protocol to construct novel forward osmosis (FO) membrane for efficient and sustainable phosphorus removal. Disodium and tetrasodium salts of ethylenediaminetetraacetic acid (EDTA-2Na, EDTA-4Na) were separately grafted onto the conventional polyamide (PA) membranes via chemical complexation using Fe 3+ as a bridge. These EDTA salts substantially improved the membrane properties. Consequently, the water fluxes produced by the EDTA-2Na and EDTA-4Na modified membranes increased by 109% (11.1 LMH) and 140% (12.7 LMH), respectively, relative to that of the pristine membrane (5.3 LMH) with 0.5 M NaCl as the draw solution. Meanwhile, the EDTA-4Na modified membrane surpassed the naked PA membrane in performance with higher water recovery efficiencies and solute rejections after long-term experiments against a mixture of bovine serum albumin and HPO 4 2− . Moreover, the water flux recovery ratio of the naked PA membrane was only 51%, while that of the EDTA-4Na modified membrane reached over 93% after three cycles of fouling experiments. This study provides a new paradigm to develop FO membrane via a metal–ligand complexation protocol for efficient and sustainable wastewater treatment. Graphical abstract Novel FO membranes synthesized through a complexation protocol are used for phosphorus removal and fouling resistance in forward osmosis.
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JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 7
·3885-3896
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IF 1.938
Sun Lili,Guo Yun,Fu Lixin,Hu Yao,Pan Shengsen,Huang Jian,Zhen Qiang
In this research, unique Tourmaline@ZnO micro-nano structure were constructed by surface-coating using uniform precipitation, with tourmaline particles as the inner core and nano-zinc oxide as the outer layer. In order to explore the optimized preparation conditions towards the highly efficient degradation of organic pollutant, the preparative experiments were implemented based on the two most crucial processing parameters: growth temperature and dosage of tourmaline. The structure, morphology and surface analysis of as-prepared core–shell composites were systemically characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller and x-ray photoelectron spectroscopy measurements, then the optical and optoelectrical properties were tested by ultraviolet–visible spectroscopy, photoluminescence spectroscopy and electrochemical performance. The photocatalysis performances were evaluated by selecting methyl orange as the model dye under the irradiation of a xenon lamp. In the case of a growth temperature of 100°C and tourmaline introduction amount of 3 wt.%, the correlated investigations confirmed that the hybrid tourmaline@nano-ZnO product achieved the most efficient degradation efficiency of 90% and the fastest reaction velocity of 0.8889 h −1 respectively within 2 h, with an enhancement of 9% and 36% compared to pure ZnO (the degradation rate was 81% and reaction rate was 0.6521 h −1 ). The tourmaline core was confirmed to make important contributions to the growth morphology and degradation performance of ZnO-based photocatalytic materials. The introduction of tourmaline will play a key role in the properties modification of metal oxide.
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CELLULOSE
·
2021
·Vol. 28
·期 10
·6481-6498
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IF 5.044
Lang Daning,Shi Ming,Xu Xia,He Shixue,Yang Chao,Wang Lu,Wu Ronglan,Wang Wei,Wang Jide
Abstract 4-Nitrophenol is a highly toxic environmental pollutant. It is a challenge to selectively remove it from a mixture of various pollutants. Herein, we report a study on the selective adsorption of 4-nitrophenol by using molecularly imprinted polymers (MIPs). The imprinted polymer was synthesized using cellulose as a framework, onto which, the complex of the imprinting molecule (i.e., 4-nitrophenol) and a candidate material [namely, 2-(dimethylamino)ethyl methacrylate. DMAEMA] was grafted. The obtained MIP showed an excellent adsorption capacity with good selectivity. Also, the adsorption of 4-nitrophenol by the obtained MIP was fast and the adsorbent exhibited good recyclability. The thermodynamics and kinetics of the adsorption process of 4-nitrophenol by MIP was thoroughly studied, where an otherwise-equivalent non-imprinted polymer was used as a control in the experiments. The selectivity of the MIP adsorbent for 4-niteophenol was evaluated by two types of experiments: (1) adsorption experiments in single-component adsorbate systems (containing 4-nitrophenol, 3-nitrophenol, catechol, or hydroquinone), and (2) competitive adsorption experiments in binary adsorbate systems (containing 4-nitrophenol plus either 3-nitrophenol, catechol or hydroquinone). The selectivity coefficient for 4-nitrophenols was twice of those of other phenols (that were all around 2), indicative of the extent of the affinity of MIPs to these phenolic compounds. The recyclability of the adsorbent was evaluated for 5 adsorption–desorption cycles, where the adsorption capacity of the last cycle remained over 90.2% of that of the first cycle. Graphic Abstract
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高影响因子
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 38
·期 2
·265-272
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IF 1.232
Wang Jianfeng,Zhao Make,Lu Xiaoli,Gu Hongbing,Liu Baoquan
Glucose dehydrogenase, as an important biocatalyst, has been widely used in biosensors, especially in measuring blood glucose levels. The low stability of the enzyme limits its applications in clinics and industry. To improve the stability, graphene oxide nanoparticles were fabricated, characterized, and used to immobilize of glucose dehydrogenase. The nanoparticles were characterized by FTIR. The enzyme was covalently immobilized on the nanoparticles with the activation of glutaraldehyde. After optimizing the immobilization conditions, an immobilization yield of 92% and the activity recovery of 91% were achieved. The immobilized GDH was characterized and compared with the free enzyme. It showed 6.9-fold higher stability than that of the free enzyme after the immobilization. And after 25 cycles, the immobilized GDH remained 50% of the initial activity. These results indicated that the immobilization could broaden the applications of the GDH in the industry and clinic.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 21
·12212-12223
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IF 4.22
Lu Qi-Lin,Wu Jiayin,Li Yonggui,Li Lu,Huang Biao
The use of lignocellulosic materials for extracting functionalized cellulose nanocrystals (FCNs) in a green and sustainable method under mild conditions is limited owing to the strong hydrogen bonding in cellulose. A facile, green, and high-efficient avenue was developed to produce FCNs with high yield through the mechanochemistry synergetic effect of recyclable p-toluenesulfonic acid (PTSA)-catalyzed deep eutectic solvent (PDES) and microwave- solvothermal (MWS). FCNs with a high charge density of 1.59 e nm −2 , a crystallinity of 81%, a better thermostability and dispersibility were obtained at a high yield of 87.6% by the one-step processing. The PDES could be easily recycled, and thus was beneficial to cost reduction and waste liquor treatment. Generated FCNs could be used to develop functional bionanocomposites due to their enhanced effect. When a loading of 1 wt% FCNs was added into gelatin matrix, the tensile strength and Young’s modulus of the bionanocomposites increased 188 and 131%, respectively, suggesting their remarkable stress transfer potential. Thus, the study demonstrates a green and cost-effective approach for the mass production of FCNs, contributing to strong potential in building high-performance bionanocomposites.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 17
·10676-10690
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IF 4.22
Tian Jiaying,Zhao Yingying,Wu Lili,Deng Xiaohui,Zhao Zhijing,Zhang Chaocan
Polyvinylidene fluoride (PVDF) is widely used as a kind of water treatment membrane material, but its high hydrophobicity leads to easily being polluted by oily wastewater, which limits further development in the field of water treatment. In this paper, a simple and green strategy based on chitosan (CS) and tannic acid (TA) was taken to transform the hydrophobic PVDF membrane into superhydrophilic one. CS possessed excellent capability of antifouling but its surface binding affinity was relatively poor, while TA enjoyed wonderful surface adhesion and certain ability of absorbing water. Herein, combining the advantages of CS and TA, a special partially sacrificial coating was designed. (3-cholropropyl)trimethoxysilane (CTS) was used as a chain connecting the PVDF substrate with CS to form the first coating layer, and then TA was introduced as the second coating layer. Because of the unstable characteristic of CS coating, part of the polluted coating can be washed away by pure water with the contaminants. The modified membrane showed superhydrophilicity (the water contact angle was 17°) and underwater superoleophobicity (the underwater oil contact angle was 158°). Moreover, the initial pure water flux of modified membrane was 8579 L m −2 h −1 , which was more than twice than that of pristine membrane (3057 L m −2 h −1 ). After the membrane was contaminated by toluene emulsion and rinsed thoroughly with pure water, the water flux recovery rate of the modified membrane reached about 98%, meaning the modified membrane possessed excellent anti-fouling and self-recovery ability. Besides, the rejection rate of toluene emulsion was 99.1%, showing the modified membrane could be used to efficiently handle the oil/water separation. During six cycles of being polluted and rinsed, the water flux recovery rate would decrease a little after each cycle, from 98% to 94.3% in the end, which demonstrated that the sacrificial layer did exist. This facile approach has great potential in practical water remediation. Graphical abstract
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危险品化学品经营许可证（带存储）