EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2022
·Vol. 248
·期 11
·2857-2864
·
IF 3.498
Ouyang Xiaoyan,Fan Yunyan,Huang Shan,Liu Xiaoling
Nitrofurans, a kind of banned antibiotics for their serious toxic side effects, have often been found in aquatic products in the past and are still found nowadays which were a severe threat for human health. A rapid quantization of nitrofuran metabolites residues in aquatic products by ultra-high performance liquid chromatography–tandem mass spectrometry (UHPLC–MS/MS) method was developed in this study. The experimental operation consisted of an acid-catalyzed release of protein-bound metabolites, followed by derivatization with 2-chlorobenzaldehyde (2-CBA) and then extraction with ethyl acetate before analysis by positive electrospray ionisation (ESI + ) with multiple reaction monitoring (MRM) type. 2-CBA was employed as derivatization reagent in this study, which greatly reduced the derivatization time. The linearity range for the four analytes were 0.25–50 μg kg −1 with good determination coefficients ( R 2 > 0.9982). The limit of detection (LOD) were 0.1 μg kg −1 , 0.1 μg kg −1 , 0.3 μg kg −1 , 0.3 μg kg −1 and the limit of quantification (LOQ) were 0.3 μg kg −1 , 0.3 μg kg −1 , 0.9 μg kg −1 , 0.9 μg kg −1 for AOZ, AMOZ, SEM, and AHD, respectively. Recovery rates were ranged from 90% to 114% for fortified samples at levels of 1.0 μg kg −1 , 5.0 μg kg −1 and 10 μg kg −1 with relative standard deviation values ranging from 1.6% to 5.8%. The developed method was successfully applied in 100 aquatic products for NFs metabolites detection and the results were further confirmed by the national standard GB/T 21311-2007 method.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Xu Shengrui,Dong Panlong,Qin Ming,Liu Hailin,Long Anying,Chen Changpo,Feng Suling,Wu Hongjing
Core-shell structured Fe 2 O 3 /CeO 2 @MnO 2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe 2 O 3 /CeO 2 @MnO 2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04–100 ng mL −1 , with low limits of detection varying from 0.38 to 3.57 ng L −1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1–8.2% and 7.1–11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe 2 O 3 /CeO 2 @MnO 2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity. Graphical abstract
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Nano Research
·
2021
·Vol. 15
·期 3
·2592-2598
·
IF 8.897
Mao Xue,Zhao Li,Zhang Kun,Wang Yao-Yu,Ding Bin
Ceramic membranes are attractive for thermal management applications due to its lightweight and ultralow thermal conductivity, while it is indispensable to address the long-standing obstacle of its poor mechanical stability and degradation under thermal shock. In this work, a series of the organic polymer template-modulated yttria doped zirconia (YDZ) nanofibrous membranes with lightweight, superior mechanical and thermal stability are developed through a cost-effective, scalable sol-gel electrospinning and subsequent calcination method. The YDZ membranes demonstrate excellent flexibility and foldability, which can be attributed to the tetragonal phase and small crystallite size of the YDZ fibers due to the presence of yttria. Besides, the fibrous size, grain size, mechanical and thermal stability of YDZ nanofibrous membranes could be tailored by varying the species and molecular weight of polymer template. The remarkable performances are obtained through the poly(vinyl pyrrolidone) (PVP) template YDZ nanofibrous membranes, featuring the superior tensile strength up to ∼ 4.82 MPa, excellent flexibility with bending rigidity ∼ 26 mN, robust thermal stability up to 1,200 °C, ultra-low thermal conductivity of 0.008–0.023 W·m −1 ·K −1 (25–1,000 °C), and excellent flame retardancy with tolerance of flame up to 1,000 °C. The remarkable properties can be attributed to the smaller fibrous size, and higher grain size resulting from PVP template. This robust material system is ideal for thermal superinsulation with a wide range of uses from energy saving building applications to spacecraft.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 36
·19899-19914
·
IF 4.22
Lin Jian,Wang Kangqi,Li Jiangen,Yang Dangsha,Zhu Yanyan,Wang Xinlong
The bimetallic metal–organic framework (CoZn-ZIF) particles of flower bulbs, were grown onto short carbon fibers (SCFs) through an in-situ growth method to prepare CoZn-ZIF@ SCFs. The flame retardant intumescent epoxy resin (EP) composites, were fabricated with CoZn-ZIF@SCFs and ammonium polyphosphate (APP). The limiting oxygen index value of 1wt%CoZn-ZIF@SCFs/4wt%APP/EP composite reached 28.9%, and V-0 rating in UL-94 was attained. Meanwhile, the peak of heat release rate and total heat release was reduced 57.6% and 30.4%, compared with pristine epoxy resin. The analysis of pyrolysis gases and residual char, showed that the improvement in flame retardancy and smoke suppression was due to the catalytic carbonization effect of CoZn-ZIF, along with the strengthening action of the residual layer by SCFs, which led to the generation of more residual char and made it more stable. The improvement in mechanical properties of the flame retardant composite, was due to the reinforcement effects of CoZn-ZIF@SCFs, and its action of interfacial adjustment. This research solved the contradiction between the flame retardancy and mechanical properties of epoxy resin, and proposed a new method to prepare flame-retardant epoxy resin with high performance. Graphical abstract
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 6
·1844-1853
·
IF 3.186
Li Zihan,Yang Lingbin,Zhu Lijun,Xia Daohong
Novel B-doped NiP/Hβ (Hβ is the hydrogen proton exchanged β molecular sieve) catalysts were prepared and the catalytic performance for n-C 6 (n-hexane) isomerization was studied firstly. It was found that the mole ratio of Ni, P and B in preparing B-doped NiP had important influence on the crystalline structure and catalytic activity of NiPB. When the mole ratio of Ni, P and B was 1:1:1, the prepared NiPB was amorphous and NiPB/Hβ had the best catalytic activity with the conversion rate of n-C 6 , the yield and selectivity of isoparaffins being 79.93%, 78.34% and 98.01% respectively. It was also showed that the preparation conditions of catalyst including NiPB loading on carrier and calcination temperatures were the key factors for the catalytic performance of NiPB/Hβ. In controlled experiments, ammonia poisoned acid sites on the catalyst led to the markedly reducing of catalytic performance and metal sites were essentially for the dehydrogenation-hydrogenation reaction. The isomerization of n-C 6 catalyzed by NiPB/Hβ is a continuous alternating process of acid catalysis and metal catalysis, and the matching of acid sites and metal sites is of importance. Graphic Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 18
·22910-22920
·
IF 2.478
Zhao Yuan,Zhang Mengqi,Wang Wei,Song Wenli,Jiang Kanrui,Zhang Xiaojuan
Ti 3+ /N-co-doped TiO 2 was successfully synthesized in situ by one-step hydrothermal method using tetrabutyl titanate (TBOT) as the titanium source and hydrazine hydrate as the reducing agent and nitrogen source. Afterward, the microstructure and physicochemical properties of the catalysts were characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Results indicated that nitrogen was effectively doped into the lattice of TiO 2 and Ti 3+ was stably presented in the prepared TiO 2 , which reduced the band-gap TiO 2 (2.96–2.75 eV) and enhanced photo-induced charge separation efficiency under visible light. In addition, the photocatalytic activity was evaluated by degradation of rhodamine B under xenon lamp with 420 nm filter. With the amount of hydrazine hydrate increased, the photocatalytic degradation performance of the sample increased first and then decreased. When the volume ratio of hydrazine hydrate to TBOT was 1:5, the sample showed the best photocatalytic performance.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-15
·
IF 16.419
Xu Jie,Cui Jian,Yang Shaomin,Han Yu,Guo Xi,Che Yuhang,Xu Dongfang,Duan Chenyang,Zhao Wenjing,Guo Kunpeng,Ma Wanli,Xu Baomin,Yao Jianxi,Liu Zhike,Liu Shengzhong
A series of 10 imidazolium-based ionic liquids (IILs) with different cations and anions have applied to unravel the passivation mechanism of the IILs on CsPbI 2 Br inorganic perovskites.
It is found that anions of IILs play a more important role in passivation of lead- and cesium-related defects in inorganic perovskite compared with imidazole cations because they can form strong ionic interactions (Pb-F, Cs-F).
A high-power conversion efficiency of 17.02% is obtained, which is among the highest values of CsPbI 2 Br-based perovskite solar cells.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 13
·19273-19282
·
IF 4.223
Lu Jiarui,Wu Jie,Gong Lulin,Cheng Yuan,Yuan Qingbin,He Yide
Despite extensive investigation on the toxicity of microplastics (MPs), an emerging global concern, little is known about the combined toxicity of MPs and co-occurring pollutants in aquatic environments. In this study, the combined toxicity of polystyrene MPs and sulfamethoxazole (SMZ) antibiotics was explored in zebrafish embryos in terms of the developmental, physiological, and endocrine toxicities. Exposure to PS and SMZ induced mortality (rate: 25.0 ± 7.5%) and malformation (rate: 20~35%) at multiple regions and stages of zebrafish development. Physiological toxicity was also induced as shown by the significant decrease in fetal movement (by 31.1~37.0%) and swimming frequency (by 26.9~36.8%) and the increase in heartbeat rate (by 19.0~20.9%). Finally, PS and SMZ exposure also induced extensive endocrine toxicities in zebrafish as confirmed by increases in various biomarkers including vitellogenin, 17β-estradiol, testosterone, and triiodothyronine. The combination index showed that antagonistic effects were present between PS and SMZ toxicity, which slightly decreased their combined toxicity. This study aims to further understand the combined toxicity of MPs and co-occurring pollutants in aquatic environments.
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Science China-Life Sciences
·
2021
·Vol. 65
·期 6
·1198-1212
·
IF 6.038
Zhang Qi,Li Danyang,Dong Xue,Zhang Xiaowen,Liu Junwu,Peng Lili,Meng Bo,Hua Qi,Pei Xinyu,Zhao Lu,Hu Xiaoxi,Zhang Yang,Pan Zhenwei,Lu Yanjie,Yang Baofeng
Diabetic cardiomyopathy (DCM) is a common complication in diabetic patients. The molecular mechanisms of DCM remain to be fully elucidated. The intronic long noncoding RNA of DACH1 (lncDACH1) has been demonstrated to be closely associated with heart failure and cardiac regeneration. In this study, we investigated the role of lncDACH1 in DCM and the underlying molecular mechanisms. The expression of lncDACH1 was increased in DCM hearts and in high glucose-treated cardiomyocytes. Knockout of lncDACH1 reduced mitochondrial oxidative stress, cell apoptosis, cardiac fibrosis and hypertrophy, and improved cardiac function in DCM mice. Overexpression of lncDACH1 exacerbated mitochondria-derived reactive oxygen species (ROS) level and apoptosis, decreased activity of manganese superoxide dismutase (Mn-SOD); while silencing of lncDACH1 attenuated ROS production, mitochondrial dysfunction, cell apoptosis, and increased the activity of Mn-SOD in cardiomyocytes treated with high glucose. LncDACH1 directly bound to sirtuin3 (SIRT3) and facilitated its degradation by ubiquitination, therefore promoting mitochondrial oxidative injury and cell apoptosis in mouse hearts. In addition, SIRT3 silencing abrogated the protective effects of lncDACH1 deficiency in cardiomyocytes. In summary, lncDACH1 aggravates DCM by promoting mitochondrial oxidative stress and cell apoptosis via increasing ubiquitination-mediated SIRT3 degradation in mouse hearts. Inhibition of lncDACH1 represents a novel therapeutic strategy for the intervention of diabetic cardiomyopathy.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-11
·
IF 14.919
Hou Shengtai,Ma Xuefeng,Shu Yuan,Bao Jiafeng,Zhang Qiuyue,Chen Mingshu,Zhang Pengfei,Dai Sheng
The sintering of Supported Transition Metal Catalysts (STMCs) is a core issue during high temperature catalysis. Perovskite oxides as host matrix for STMCs are proven to be sintering-resistance, leading to a family of self-regenerative materials. However, none other design principles for self-regenerative catalysts were put forward since 2002, which cannot satisfy diverse catalytic processes. Herein, inspired by the principle of high entropy-stabilized structure, a concept whether entropy driving force could promote the self-regeneration process is proposed. To verify it, a high entropy cubic Zr 0.5 (NiFeCuMnCo) 0.5 O x is constructed as a host model, and interestingly in situ reversible exsolution-dissolution of supported metallic species are observed in multi redox cycles. Notably, in situ exsolved transition metals from high entropy Zr 0.5 (NiFeCuMnCo) 0.5 O x support, whose entropic contribution (TΔS config = T ⋆ 12.7 J mol −1 K −1 ) is predominant in ∆G, affording ultrahigh thermal stability in long-term CO 2 hydrogenation (400 °C, >500 h). Current theory may inspire more STWCs with excellent sintering-resistance performance.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-9
·
IF 5.833
Jia Jing,Lu Wenjing,Cui Sai,Dong Chuan,Shuang Shaomin
N, Cl-doped carbon dots (N, Cl-CDs) were prepared by hydrothermal method from rhodamine B (RhB) and ethylenediamine (EDA). The resulting N, Cl-CDs exhibited fascinating solvent dependence and strict excitation independence. As the polarity of the solvent increased (from tetrahydrofuran (THF) to water), the emission spectrum of N, Cl-CDs was redshifted and the fluorescence efficiency decreased, which were attributed to hydrogen bond-induced aggregation. Taking advantage of these attributes, the N, Cl-CDs were used as suitable probes for fluorescence and colorimetric dual-mode detection of water in THF. The linear relationship was 0.5–100% water with the detection limit down to 0.093%. Moreover, the sensing platform was converted into a paper-based sensor for handy, real-time, and visible humidity sensing. N, Cl-CDs/PVA films were fabricated and realized continuously tunable solid-state fluorescence, further expanding their practical application. Graphical abstract
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 12
·1634-1644
·
IF 3.603
Yuan Meng-Jie,Hu Zhao-Yu,Fang Hong,Li Shu-Jing,Guo Hong-Tao,Hu Ru-Bei,Jiang Shao-Hua,Liu Kun-Ming,Hou Hao-Qing
Polynaphthalimide (PNI) with six-membered imide ring ( 6 -PI) has better chemical resistance than five-membered imide ring ( 5 -PI), but is difficult to be processed into nanofibers due to the poor processability. In this work, we proposed a template strategy to fabricate nanofiber 6 -PI membranes and their composite membranes. Neat 6 -PI and 6 -PI composite fibrous membranes were prepared using high-molecular-weight polymers 5 -PAA and PVP as templates by electrospinning. FTIR, DMA, TGA and tensile tests were used to characterize their chemical structures, thermal stability and mechanical properties. Further eye-observation, micro-morphology investigation and tensile tests were applied to evaluate the chemical resistance of nanofibrous membranes in strong acid, strong alkaline, and concentrated salt. The results demonstrated that 6 -PI nanofibrous membranes possessed the best thermal stability, best acid, alkaline, and salt resistance with the highest mechanical retention. This study will provide basic information for high-performance electrospun 6 -PI nanofiber membranes and provide opportunities for applications of PIs in different chemically harsh environments.
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