FOOD CHEMISTRY
·
2023
·
IF 8.8
Ruiyu Zhu,Zhen Chen,Helin Lv,Yani Pan,Xinyu Feng,Guicai Chen,Weilian Hu,Tianhua Xu,Fangyuan Fan,Shuying Gong,Ping Chen,Qiang Chu
Aged white tea (WT) has promising medicinal potential, but how to accurately identify aged white tea is still a difficult problem. Inspired by tea cream, the relationship between the characteristics of nanoparticles in tea infusion and aging time was studied. The results showed that with the increase of aging time, the particle size of white tea nanoparticles (WTNs) decreased gradually. Microscopic images showed that the surface structure of WTNs was changed in three aspects: the waxy layer, the cuticle layer and the palisade tissue. Additional in vitro modeling demonstrated a strong correlation between nanoparticle size and protein and tea polyphenol content. The correlation between nanoparticle sizes and aging time was further verified in aged Pu’er raw tea. Starting with the tea infusion's nanoparticles, this study showed that the aging time of WT would impact the nanoparticles' properties, offering a unique way to determine the aging period of WT.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qiao Li,Guanyong Wu,Xinze Wu,Huaixia Chen,Xueping Dang,Xiaolan Liu
An acidity-sensitive poly(N-isopropylacrylamide-methyl acrylic acid-co-divinyl- benzene) monolith was prepared in situ in a pipette tip for solid phase extraction of phenol, m-cresol, o-nitrophenol, 2,4-dichlorophenol and p- tert -butylphenol. The monolith was characterized by FT-IR, BET (surface area = 266.56 m 2 /g) and thermogravimetric analysis (thermally stable up to 350 °C). The introduction of methyl acrylic acid enhanced the stability in the strong alkaline condition. The adsorption experiments and density function theory calculations indicated NIPAM was the main adsorption sites and the adsorption mechanism of phenol on the monolith was hydrophobic interaction, H-bond interaction, C − H···π interaction of isopropyl group of NIPAM with the phenyl group of phenols. Based on these features and under the optimal extraction conditions, a pipette tip solid phase extraction coupled to high-performance liquid chromatography with ultraviolet detection method was developed for the determination of 5 phenols in the diffusion of polycarbonate cups. Due to the usage of 0.1 M NaOH as the eluent, the method presented selectivity for phenols based on the acidity-sensitive of the monolith. Wide linear range (0.6–200 µg/L), low detection limits (0.2–0.3 µg/L), good reproducibility (%RSD less than 9.8%) and satisfactory recoveries (86.3–114.1%) were obtained. The proposed method was suitable for quantitative analysis of phenollic in water samples.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Zhizhuo Chai,Jingquan Wang,Yixue Dai,Erdeng Du,Hongguang Guo
Methylisothiazolinone (MIT) is widely used in daily chemicals, fungicides , and other fields and its toxicity has posed a threat to water system and human health. In this study, ultraviolet (UV)/trichloroisocyanuric acid (TCCA), which belongs to advanced oxidation processes (AOP), was adopted to degrade MIT. Total chlorine attenuation detection proved that TCCA has medium UV absorption and a strong quantum yield (0.49 mol E −1 ). At a pH of 7.0, 93.5% of MIT had been decontaminated after 60 min in UV/TCCA system (k obs = 4.4 × 10 −2 min −1 , R 2 = 0.978), which was much higher than that in the UV alone system and TCCA alone system, at 65% (1.7 × 10 −2 min −1 , R 2 = 0.995) and 10% (1.8 × 10 −3 s −1 , R 2 = 0.915), respectively. This system also behaved well in degrading other five kinds of contaminants. Tert-butanol (TBA) and carbonate (CO 3 2− ) were separately used in quenching experiments, and the degradation efficiency of MIT decreased by 39.5% and 46.5% respectively, which confirmed that HO• and reactive chlorine species (RCS) were dominant oxidants in UV/TCCA system. With TCCA dosage increasing in a relatively low concentration range (0.02–0.2 mM) and pH decreasing, the effectiveness of this AOP system would be strengthened. The influences of coexisting substances (Cl − , SO 4 2− , CO 3 2− , NO 2 − and NO 3 − ) were explored. MIT degradation pathways were proposed and sulfur atom oxidation and carboxylation were considered as the dominant removal mechanisms of MIT. Frontier orbital theory and Fukui indexes of MIT were employed to further explore the degradation mechanism.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaojuan Niu,Huanhuan He,Hang Ran,Zhen Wu,Yue Tang,Yuangen Wu
Ag 3 PO 4 nanoparticles (NPs) was prepared through a facile coprecipitation method, and was first found to have excellent laccase-mimicking catalytic activity. The study confirms that Fumonisin B1 (FB1) can effectively hinder the production of superoxide anion (O 2 − ) between Ag 3 PO 4 NPs and dissolved oxygen, and further inhibit laccase-mimicking activity of Ag 3 PO 4 NPs. Thus, a novel rapid colorimetric sensor for FB1 analysis in cereal was first established using laccase-mimicking activity as sensing signal. The absorbance variation of sensing solution is directly related to the amount of FB1, and the color change is further combined with smartphone for quantitively analysis of FB1. The limit of detection (LOD) of the sensor is determined as low as 1.73 μg·L −1 , which is far lower than the maximum residue limits (MRLs) of FB1 set by European Commission and US Food and Drug Administration (FDA). The average recovery of 87.8–104.5% for FB1 detection was obtained in cereal.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaohui Fan,Jinjin Zhao,Cheng Cheng,Yin Xu,Hui Zhang
Efficient and low-cost catalysts are important for contaminant remediation in peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs). In this study, a solid waste, generated by the polyferric chloride coagulation of the phenol-saturated powder activated carbon from an industrial wastewater treatment plant, was used to prepare metal/carbon composites under different pyrolysis temperatures (650–950 °C). The catalyst pyrolyzed at 950 °C (FeAC-950) exhibited the highest reactive activity for PMS activation as demonstrated by a series of electrochemical techniques. Nearly complete BPA elimination can be achieved within 60 min by 0.1 g L –1 FeAC-950 and 0.5 mM PMS. The results of electron paramagnetic resonance (EPR), chemical quenching and open circuit potential (OCPT) experiments demonstrate a combined radical and non-radical oxidation mechanism in the FeAC-950/PMS process and BPA was removed dominantly through radical pathway. Various persistent organic pollutants can be efficiently eliminated in the FeAC-950/PMS system. In addition, the present system showed good tolerance to natural organic matter as well as some common anions such as chloride and nitrate. This study dedicated a simple method to prepare an efficient solid waste-based catalyst in environmental catalysis. The outcomes will not only provide a value-added reuse approach for waste management but also facilitate the FeAC-950 applications in wastewater remediation technologies.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Mengxi Tan,Xiaoshan Zheng,Wanchao Yu,Baoliang Chen,Chiheng Chu
Reactive oxygen species (ROS) are widespread in nature and play central roles in numerous biogeochemical processes and pollutant dynamics. Recent studies have revealed ROS productions triggered by electron transfer from naturally abundant reduced iron minerals to oxygen. Here, we report that ROS productions from pyrite oxidation exhibit a high facet dependence. Pyrites with various facet compositions displayed distinct efficiencies in producing superoxide (O2• –), hydrogen peroxide (H2O2), and hydroxyl radical (•OH). The 48 h •OH production rates varied by 3.1-fold from 11.7 ± 0.4 to 36.2 ± 0.6 nM h–1, showing a strong correlation with the ratio of the {210} facet. Such facet dependence in ROS productions primarily stems from the different surface electron-donating capacities (2.2–8.6 mmol e– g–1) and kinetics (from 1.2 × 10–4 to 5.8 × 10–4 s–1) of various faceted pyrites. Further, the Fenton-like activity also displayed 10.1-fold variations among faceted pyrites, contributing to the facet depedence of •OH productions. The facet dependence of ROS production can greatly affect ROS-driven pollutant transformations. As a paradigm, the degradation rates of carbamazepine, phenol, and bisphenol A varied by 3.5–5.3-fold from oxidation of pyrites with different facet compositions, where the kinetics were in good agreement with the pyrite {210} facet ratio. These findings highlight the crucial role of facet composition in determining ROS production and subsequent ROS-driven reactions during iron mineral oxidation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 14
·期 1
·74
·
IF 5.3
Xin Zhong,Meihuan Ji,Wenxin Wu,Caicai Lu,Wenping Liu,Fubin Jiang
In this work, the heterojunctions of CuInS2embedded in the g-C3N4materials (xCuInS2/g-C3N4, abbreviated as xCIS/GCN) was successfully prepared for peroxymonosulfate (PMS) activation under visible light. The catalysts are characterized by different techniques, such as XRD, FTIR, SEM, TEM, and UV-vis. The unique heterojunction composites can suppress the recombination of photogenerated pairs. The catalytic results showed that the 3CIS/GCN exhibited excellent catalytic levofloxacin (LVF) degradation efficiency, while more than 98.9% of LVF was removed in 60 min over a wide pH range. SO4•−, O2•−, OH•, and1O2were verified as the main reactive species for LVF degradation via the quenching experiments and electron paramagnetic resonance technology (EPR). The synergetic effect of xCIS/GCN, PMS, and visible light irradiation was discussed. The possible LVF degradation pathway was proposed through byproducts analysis (LC-MS). Moreover, the 3CIS/GCN/vis-PMS system has very low metal leaching. Owing to xCIS/GCN having good properties for PMS activation, it has potential applications for LVF or other hazardous pollutants degradation.Keywords:peroxymonosulfate;visible-light-assisted PMS activation;antibiotics
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Longxiang Xia,Jing Shen,Dengfeng Wu
Herein, Al 2 O 3 supported ultra-small Mn-CeOx nanoparticles (Mn-CeOx/Al 2 O 3 ) are prepared by a facile impregnation method for removal of phenolic compounds via catalytic ozonation . Mn and Ce species are in the form of polyvalent oxide nanoparticles with an average size of 0.9 nm. The removal efficiency of total organic carbon for phenol-containing model wastewater by Mn-CeOx/Al 2 O 3 shows a volcano relationship by changing the mass ratio of Mn and Ce, and reaches up to the peak value when the mass ratio is 5:5. The cycle stability tests suggest the removal efficiency of Mn-CeOx/Al 2 O 3 could maintain at 90.16 % after 5 circles. The enhanced performance should be attributed to the optimized magnetism and accelerated charge transfer by composition regulation. The magnetic strength changing affects the adsorption mode of O 3 , while the redox cycle of Mn(IV)/Mn(III) and Ce(IV)/Ce(III) could enhance the activation of O 3 to produce more ·OH and 1 O 2 for the organic molecules mineralization.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qian Liu,Tao Wang,Caige Wang,Dongling Wu
Developing a novel preparation strategy for the fabrication of high-performance porous carbon electrode materials is still the focus of current research. Herein, O/N doped coal tar pitch (CTP)-based porous carbon with a fishnet-like structure is prepared via the electrospinning technology. CTP is used as a carbon source and ChCl/phenol deep eutectic solvent (DES) is used as a spinning solution directly, and not any polymer is added. The complexes obtained by electrospinning are then activated by a small amount of K 3 C 6 H 5 O 7 and get the porous carbon. Specifically, the DES has a specific viscosity and can be used not only as a solvent to improve the spinnability of CTP, but also as N source and act as a multifunctional solution. The electrospinning technology constructs the macropores and mesopores, while K 3 C 6 H 5 O 7 can make micropores and even ultra-micropores in the prepared carbon material. Benefiting from the constructive hierarchical pore channels and abundant heteroatoms doping, the prepared porous carbon electrode possesses a high specific capacitance of 202 F g −1 even when reaching commercial loading. Simultaneously, a novel K 3 C 6 H 5 O 7 /glycol/acetonitrile DES gel electrolyte is synthesized, and an extended working voltage (2.2 V) can be achieved. The fabricated capacitor has large energy density of 23.9 Wh kg −1 , and can still operate normally in a wide temperature range (-25 ∼ 100 °C). The multifunctionality of DES uncovers the feasibility of preparation of porous carbon using DES as the spinning solution directly, and may expect to prepare other carbon materials using the proposed strategy with different carbon precursors.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Kaiyang Xu,Yu Chen,Hua Yang,Yuyan Gan,Lizhi Wu,Li Tan,Yihu Dai,Yu Tang
Cyclohexanone is an important raw material for manufacturing nylon and other chemicals. The sustainable conversion of biomass derived molecules to cyclohexanone is desired but still challenging. Herein, a palladium single atom catalyst anchored in the micropores of zeolite (namely Pd 1 /ZSM-5) is designed and exhibits remarkable catalytic activity in transforming anisole to cyclohexanone in water medium (H 2 O), without using of organic solvent or halogen promoter. The selectivity to cyclohexanone is 91.2% and the turnover rate (TOR) is 400.8 h −1 at 453 K. The Pd sites, acid sites, and microporous confinement environment of zeolite cooperate to promote the partial hydrogenation to cyclohexanone, and inhibit further hydrogenation as the side reaction. H 2 O not only acts as the solvent, but also participates significantly in the partial hydrogenation. Moreover, as revealed by isotope labelled experiments (D 2 O and H 2 18 O), the water participated hydrogenolysis and the consequent partial hydrogenation mechanism is proposed.
✓ 已验证
产品关联
DOI
高影响因子
Pharmaceutics
·
2023
·Vol. 15
·期 8
·2135
·
IF 5.4
Jia Liu,Peng Sun,Xiaole Qi
Clinically, indobufen is widely used for the treatment of antiplatelet aggregation and anticoagulation. Prior studies have discovered that abnormal platelet function can be promptly restored to normal when the drug is stopped. Herein, through the study of the enzyme reaction kinetics, we demonstrated that the inhibitory effect of indobufen on cyclooxygenase-1 (COX-1) was reversible and non-competitive. Specifically, the cyclooxygenase inhibition experiment showed that the level of 6-keto-PGF1α in the gastric mucosa of the indobufen-treated groups was significantly higher than that of the aspirin group (###p< 0.001), indicating a higher level of PGI2in and a better physiological state of the gastric mucosa. Moreover, the rat gastric ulcer index and mucosal section experiments further confirmed the relief of gastrointestinal irritation and the adverse reaction rate of the indobufen-treated group compared to those of the aspirin group. Furthermore, indobufen was verified to exert reversible inhibitory activity on the heme group of COX-1 and thus reversibly inhibit COX-1 activity. In general, compared with aspirin, the long-term oral administration of indobufen yields a lower risk of gastrointestinal symptoms, such as ulcers.Keywords:indobufen;anticoagulant effect;antiplatelet effect;adverse reaction;COX-1
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Haohan Wu,Yingchun Liu,Liheng Chen,Zhengwen Li,Zhaosong Hu,Xuliang Lin,Xueqing Qiu
Enhancing the interface compatibility between the polymer matrix and filler is still a hotspot issue for the fabrication of thermal management materials. In this work, biomass lignin was used innovatively as coupling reagents to optimize the interface microstructure of the matrix/filler. The as-prepared lignin-graphite (AL@GP) and epoxy resin with a Schiff base structure (PBD-EP) were employed as functionalized filler and polymer matrix, respectively. And a degradable and thermally conductive epoxy composite was prepared through the hot-press technique. Experimental and theoretical calculations results based on the first principles demonstrated enhanced interface bonding between GP and PBD-EP. Besides, the developed polymeric composites exhibited excellent thermal conductivity (2.852 W m–1 K–1) when loaded with 50 wt % AL@GP, increasing by 26.1% compared with the PBD-EP/GP system. Moreover, it presented a reduced interface thermal resistance (0.10745 m2 K W–1) and superior solvent-free green degradability. LED heat dissipation experiments indicated the potential of as-prepared composites for thermal management applications. This work not only provides a novel and facile filler functionalization strategy for improving the interfacial interaction of the matrix/filler but also promotes the high-value applications of biomass lignin.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）