Journal of Food Measurement and Characterization
·
2016
·Vol. 11
·期 2
·548-555
·
IF 0.521
Xiaohong Zhang,Zhidong Zhao,Xiongwei Lou,Jian Li,Guohua Hui
A maltose, L-rhamnose sensor based on porous Cu foam and electrochemical techniques was investigated in this paper. Cu foam material was prepared and characterized by scanning electron microscopy (SEM). The electro-oxidation reaction process of sweeteners occurred on Cu foam electrode was evaluated by cyclic voltammetry (CV) scanning. At an applied potential of 0.5 V, the linear range for maltose is 0.18–3.47 mM with sensitivity of 1.0492 mA cm −2 mM −1 . The limit of detection (LOD) was 15.86 μM (S/N = 3). The linear range for maltose is 0.18–3.47 mM with sensitivity of 0.6881 mA cm −2 mM −1 . The LOD was 24.18 μM (S/N = 3). Compared with Cu sheet electrode, Cu foam electrode showed higher current response towards maltose and L-rhamnose, leading to enhanced electrocatalytic activity, higher sensitivity, and lower LOD. Sweetener qualitative discrimination was carried out by stochastic resonance (SR) signal-to-noise ratio (SNR) spectrum eigen peak located noise intensities.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Zhi Zijian,Chen Jianle,Li Shan,Wang Wenjun,Huang Rui,Liu Donghong,Ding Tian,Linhardt Robert John,Chen Shiguo,Ye Xingqian
Pectin, a natural polysaccharide found in the cell wall of most higher plant such as citrus, has drawn much attention due to its potential beneficial role in facilitating the treatment of many diseases like cancer, hyper cholesterol and diabetes. However, the broad application of pectin faces great limitations as the large molecular size of pectin severely prevents its bioavailability in vivo . In this study, we report an effective and highly convenient approach to degrade natural pectin into lower molecular pectin. By combining ultrasound with Fenton system (US-Fenton), we show that ultrasound synergistically enhances the efficiency of Fenton reaction to degrade pectin into 5.5 kDa within only 35 minutes. Importantly, RG-I domain, the most effective portion of natural pectin, was well preserved and highly enriched. In addition, the antioxidant activities of US-Fenton-treated pectin was significantly elevated. The mechanism of this novel observation was further investigated through the multiple structural analyses including HPLC, IR and NMR. Taken together, we present a novel and convenient approach to generate ultra-low molecular weight pectin with high efficiency and higher bioactivity. We expect our approach will have broader applications in improving the bioavailability and bioactivity of other polysaccharide-based natural compounds.
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JOURNAL OF COORDINATION CHEMISTRY
·
2017
·
IF 1.795
Bu-Lin Chen,Li Liu,Xin-Xin Zhong,Abdullah M. Asiri,Khalid A. Alamry,Fa-Bao Li,Nian-Yong Zhu,Wai-Yeung Wong,Hai-Mei Qin
Three-coordinate copper halide complexes with a bidentate phosphine ligand have received much attention. Here, a series of three-coordinate dinuclear copper halide complexes containing a diphenylamino monodentate phosphine ligand, [CuX(dpnp)]2 (dpnp = N-[2-(diphenylphosphino)-4,5-dimethylphenyl]-N-phenylaniline, X = I (1), Br (2) and Cl (3)), were synthesized, and their molecular structures and photophysical properties were investigated. The structural analysis reveals that two copper(I) centers are bridged by two halogen ligands to form a dinuclear structure with a four-membered Cu2X2 ring. Crystal structures of 1–3 contain 1-D supramolecular arrays constructed by intermolecular C–H⋯π interactions. These complexes exhibit blue emission in the solid state at room temperature and have peak emission wavelengths at 483–487 nm with microsecond lifetimes (τ = 13.9–38.1 μs) and low emission quantum yields (<0.01%). The emission of complex 1 mainly originates from intraligand (IL) transition, whereas the emissions of complexes 2 and 3 are from a combination of MLCT, XLCT and IL transitions. The three complexes displayed good thermal stability.
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PLoS One
·
2014
·Vol. 9
·期 10
·e108647
·
IF 3.534
Yankai Du,Meishan Pei,Youjun He,Faqi Yu,Wenjuan Guo,Luyan Wang
Fe 3 O 4 (Fe 3 O 4 -CS) coated with magnetic chitosan was prepared as an adsorbent for the removal of Orange I from aqueous solutions and characterized by FTIR, XRD, SEM, TEM and TGA measurements. The effects of pH, initial concentration and contact time on the adsorption of Orange I from aqueous solutions were investigated. The decoloration rate was higher than 94% in the initial concentration range of 50–150 mg L −1 at pH 2.0. The maximum adsorption amount was 183.2 mg g −1 and was obtained at an initial concentration of 400 mg L −1 at pH 2.0. The adsorption equilibrium was reached in 30 minutes, demonstrating that the obtained adsorbent has the potential for practical application. The equilibrium adsorption isotherm was analyzed by the Freundlich and Langmuir models, and the adsorption kinetics were analyzed by the pseudo-first-order and pseudo-second-order kinetic models. The higher linear correlation coefficients showed that the Langmuir model (R 2 = 0.9995) and pseudo-second-order model (R 2 = 0.9561) offered the better fits.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Pengjuan Ni,Yujing Sun,Haichao Dai,Shu Jiang,Wangdong Lu,Yilin Wang,Zhen Li,Zhuang Li
A novel colorimetric method for the detection of acetylcholinesterase (AChE) and its inhibitor by taking utilization of Ag [I] ion–3,3′,5,5′-tetramethylbenzidine (TMB) detection system has been proposed. Ag [I] ion could oxidize TMB to induce a blue color and an absorption peak centered at 652 nm. In the presence of AChE, acetylthiocholine (ACh) was hydrolyzed to thiocholine. Ag [I] ion could interact with thiocholine and thiocholine can reduce the oxidized TMB (oxTMB) to TMB, both of which suppressed the oxidation capacity of Ag [I] ion, resulting in a blue color fading and a decrease of the absorbance at 652 nm. The developed assay is highly sensitive with a low detection limit of 4.3 μU/mL. Moreover, the method was also applied in AChE inhibitor sensing. The obtained assay is fairly simple, inexpensive and sensitive without the utilization of nanomaterials, which may be not only used for the sensing of other hydrolytic enzyme activities with properly selected substrates, but also used for the screening of potential inhibitor drugs.
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JOURNAL OF MOLECULAR MODELING
·
2015
·Vol. 21
·期 12
·1-10
·
IF 1.736
Xu Shengxian,Wang Jinglan,Zhao Feng,Xia Hongying,Wang Yibo
Two copper(I) complexes [Cu(Pyz-Phen) 2 ]PF 6 (1) and [Cu(POP)(Pyz-Phen)]PF 6 (2) (Pyz-Phen = pyrazino[2,3- f ] [1, 10]phenanthroline, POP = bis[2-diphenylphosphino]-phenyl]ether) have been synthesized and characterized. The photophysical properties of these complexes in solution have been studied. The electronic absorption spectrum of complexes 1 exhibit the lowest-lying MLCT absorption band at 459 nm and high-energy ligand-based transitions at 275 nm, while that of complex 2 exhibits the MLCT/LLCT band at 400 nm and ligand π-π* band at 262 nm. In addition, both 1 and 2 show similar phosphorescence 3 MLCT/ 3 LLCT emissions with maximum emission wavelengths of 569 and 572 nm, respectively. Density functional theory (DFT) and time-dependent density functional theory (TDDFT) were employed to rationalize the photophysical properties of the complexes studied. The theoretical data confirm the assignment of the experimental absorption spectra and the nature of the emitting states.
Photophysical properties of copper(I) complexes containing pyrazine-fused phenanthroline ligands
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SYNTHETIC METALS
·
2015
·
IF 2.252
Jie Zhao,Yu Xie,Dongsheng Hu,Dongsheng Guan,Junhong Chen,Jian Yu,Shuai He,Ying Lü,Huilong Liu,Shaokui Bao,Lei Wang
The graphene (GN)/phenylenediamine–benzaldehyde (PD–BD) Schiff base Ag(I) complexes were synthesized by the Schiff-base reaction. The morphology and phase structure of the samples were characterized by electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction techniques. Their conductive properties were measured by a four-probe conductivity tester at room temperature. And their magnetic properties were tested by a vibrating sample magnetometer. These results show that the PD–BD Schiff base Ag(I) complexes are chemically bonded onto the GN framework to form an intercalated structure. The conductivity, saturation magnetization, residual magnetization and coercive force of the final complex are found to be 5.07 S cm −1 , 2.93 emu g −1 , 0.69 emu g −1 and 104.68 Oe, respectively. Finally, a possible formation and magnetic mechanism of the composites has also been proposed.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hu Li,Yingying Peng,Weixiang Zhou,Jun Guo,Chao Gao,Yapeng He,Mingxi Pan,Congqing Yang,Hui Huang
In the development of back electrodes for perovskite solar cells (PSCs), the major challenges are stability and cost. To address this, we present an innovative approach: Simultaneous evaporation of two independently controlled sources of metal materials was performed to achieve a uniform distribution of the alloy electrodes. In this study, Ag–Cu alloys (the molar ratio of Ag/Cu is 7/3) with a high-index crystal face (111) and a work function matching perovskite were prepared using a codeposition technique. These properties mitigate nonradiative carrier recombination at the interface and reduce the energy barrier for carrier migration. Consequently, compared to Ag based PSCs (22.77%), the implementation of Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs resulted in a power conversion efficiency of 23.72%. In a 1500 h tracking test in ambient air, the Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs maintained their initial efficiency of 86%. This can be attributed to almost no migration of elements from the Ag–Cu alloy electrode to the perovskite layer. Our work presents a vital strategy for improving the stability of PSCs and reducing the costs associated with the back electrode in PSCs.
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TALANTA
·
2024
·
IF 5.6
Ming Li,Weipeng Teng,Wenying Lu,Mingna Sun,Jinsheng Duan,Xuchun Qiu
The improvement of dual-mode techniques was of particular interest to researchers, which might enhance the detection performance and applicability. Here, a dual-mode optical aptasensor (DO-aptasensor) platform based on exonuclease I (Exo I) cyclic digestion and synergistic enhancement strategy had proposed for zearalenone (ZEN). Following the preparation of dumbbell-shaped signal probe, the Exo I-based cyclic digestion amplification performed, and then the synergistic enhancement effect carried out to achieve the Poly-HRP-based colorimetry and FAM-SGI-based fluorescence. The efficient homogeneous system realized through the magnetic separation, while the signal interference further eliminated by the graphene oxide (GO). The LOD values were as low as 0.067 ng mL −1 for colorimetry mode and 0.009 ng mL −1 for fluorescence mode, which reduced 23-fold and 172-fold than ELASA by same ZEN-Apt. This promising platform gave rise to a dual-mode optical readout, improved sensitivity and positively correlated detection. Meanwhile, the DO-aptasensor also exhibited the acceptable specificity, desirable reliability and excellent practicability. This novel avenue of aptasensor platform hold great potential for dual-mode optical monitoring of other targets, which can further expand the application scope of Exo I-based signal amplification and synergistic enhancement effect.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jiabei Gao,Weiquan Zhan,Ziwei Xiang,Shaoxian Song,José Luis Arauz-Lara,Feifei Jia,Peng Chen
Trace gold(I) recovery from thiosulfate solutions limits the application of thiosulfate leaching instead cyanide leaching method in industries. Here, facet engineering in cadmium sulfide (CdS) was proposed for trace gold(I) recovery from thiosulfate solutions (Au(S 2 O 3 ) 2 3− ). CdS nanomaterials with various exposing facets were obtained through adjusting the sulfur sources in hydrothermal synthesis process. It was found that Au(S 2 O 3 ) 2 3− recovery could reach 98.62 % under low concentration conditions, with a max reduction capacity of 204.95 mg/g. Besides, the recovery form of Au(S 2 O 3 ) 2 3− on CdS was metallic gold, realizing the reduction and recovery at the same time. The solution pH, sample dosage, S 2 O 3 2− , SO 3 2− , and ammonia ions as variants were considered to optimize the recovery performances. Even under the existence of interfered ions, the recovery kept very high. Au(S 2 O 3 ) 2 3− reduction on CdS was attributed to catalytic and chemical reduction. High exposed (0 0 2) facet content of CdS enhanced photocurrent intensity, thus improving Au(S 2 O 3 ) 2 3− reduction and recovery. Therefore, the work paved a way to realize trace gold(I) recovery from thiosulfate solutions via structure engineering in CdS, being expected to promote the application of thiosulfate leaching method.
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Cell Discovery
·
2024
·Vol. 10
·期 1
·1-14
·
IF 13
Li Hao,Du Yu,Cheng Kaiwen,Chen Yuxi,Wei Ling,Pei Yujun,Wang Xiaoyu,Wang Lan,Zhang Ye,Hu Xiaoxin,Lu Yi,Zhu Xiangjia
High myopia (HM) is a leading cause of blindness worldwide with currently no effective interventions available. A major hurdle lies in its often isolated perception as a purely ocular morbidity, disregarding potential systemic implications. Recent evidence suggests the existence of a gut-eye axis; however, the role of gut microbiota in the pathogenesis of HM remains largely unexplored. Herein, we provide a potential crosstalk among HM’s gut dysbiosis, microbial metabolites, and scleral remodeling. Utilizing 16S rRNA gene sequencing, we observed an altered gut microbiota profile in HM patients with a significant reduction in probiotic abundance compared with healthy controls. Subsequent targeted metabolic profiling revealed a notable decrease in plasma levels of the gut microbiota-derived metabolite indole-3-acetic acid (3-IAA) among HM patients, which is closely associated with the reduced probiotics, both negatively correlated with HM severity. Genetic analyses determined that gut microbiota are causally associated with myopia risk. Importantly, when mice subjected to HM modeling receive fecal microbiota transplantation from healthy donors, there is an increase in 3-IAA plasma levels and simultaneous retardation of HM progression along with better maintenance of collagen type I alpha 1 (COL1A1) expression in the sclera. Furthermore, 3-IAA gavage achieves similar effects. Mechanistic investigations confirm the transcriptional activation of COL1A1 by 3-IAA via promoting the enrichment of SP1 to its promoter. Together, our findings provide novel insights into the gut microbiota-eye axis in the pathogenesis of HM and propose new strategies for HM intervention by remodeling the gut microbiota and indole supplementation.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xia Liu,Lin Yang,Bohan Li,Yan Xu
Copper-based halides have attracted significant attention due to their unique photophysical properties and diverse coordination configurations. However, enhancing water stability and modulating structural transitions in cuprous halide materials remain challenging. In this work, we successfully synthesized three copper(I) halides, (C24H28P)CuBr2 (L1, [C24H28P]+ = hexyltriphenylphosphonium), (C24H28P)2Cu4Br6 (L2), and (C24H28P)2Cu4I6 (L3), via solvent volatilization, demonstrating exceptional water stability even after 27 days of submersion. Crystals L1 and L2 emit yellow and orange light, respectively, under ultraviolet excitation, while L3 emits green light when excited by blue light. A rapid phase transition between L1 and L2 occurs when stimulated with methanol at room temperature. Further exposure of L2 to a NaI solution can result in substitution of Br– ions by I– in [Cu4Br6]2– to form L3. Multimodal anticounterfeiting luminescent labels with high-security levels have been successfully manufactured based on sequential L1 → L2 → L3 phase transition. Moreover, a test paper designed based on L1 can be applied for low-level methanol detection. This work successfully accomplishes the coregulation of structural transformations and luminescence switching in copper(I) halides by combining methanol simulations with halogen substitution strategies, which not only deepens the understanding of the structure–property relationships but also broadens the optical applications of these materials.
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