Chemosensors
·
2025
·Vol. 13
·期 4
·137
·
IF 3.7
Siying Li,Dongdong Du,Shaoming Cheng,Zhenbo Wei
This study aimed to quantify the bitter–astringent interactive perceived intensity (BAIPI) of green tea based on the Weber–Fechner law by two-alternative forced choice test. Caffeine, (-)-epigallocatechin-3-gallate (EGCG), and Quercetin-3-o-rutinoside (Que-rut) were identified as the key bitter–astringent compounds. Then, BAIPI values were assessed based on the concentration ratios and ranges of caffeine, EGCG, and Que-rut in green tea according to the Weber–Fechner law. The BAIPI values were further fitted to a logarithmic curve:yBAIPIvalue=a×lnxconcentration of caffeine−b−c+IVinitialBAIPIvalue−1. The constant termsa,b, andcwere derived from the ratio of caffeine to EGCG, as the slope and X-intercept of the curves correlated exponentially with this ratio. The initial BAIPI value (IV) was calculated as:IVinitialBAIPIvalue=18.7960−0.3956q(theratioofcaffeinetoQue−rut). Validation showed a standard error of 1.5865 between estimated and actual BAIPI values. This method enables the estimation of bitter–astringent intensity in green tea by analyzing the concentrations of caffeine, EGCG, and Que-rut.
研究领域:
食品科学
·
感官评价
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产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Mingde Tong,Qiangang Fu,Mingyu Liang,Tao Feng,Wanbo Hou,Jia Sun,Xinhao Shi
To optimize the impact-ablation resistance of SiC nws @PyC/HfC coating, PyC-SiC double-layer interface phase was introduced. After impacting test, the crack widths of SiC nws @PyC-SiC/HfC were much lower than that of SiC nws @PyC/HfC coating. The impact-ablation resistance of SiC nws @PyC-SiC/HfC coating was better than that of SiC nws @PyC/HfC coating. The good impact-ablation resistance SiC nws @PyC-SiC/HfC coating attributed to the two-grade pull-out reinforcement effect, self-sealing function of Hf-Si-O glass generated from oxidation of SiC nws @PyC-SiC core-shell structure and the precipitation of HfO 2 grains from Hf-Si-O glass under ablation environment.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
Results in Physics
·
2022
·
IF 4.565
Yige Du,Qilong Gao,Andrea Sanson,Hengli Xie,Yangming Hu,Gaojie Zeng,Juan Guo,Xiao Ren,Erjun Liang
Negative thermal expansion (NTE) is an intriguing physical phenomenon, which is of great significance for the high precision application. In this work, we have realized to broaden the NTE temperature zone in Mg 2 P 2 O 7 -based bulk material by doping Cu atom on the Mg site. A joint study of Raman scattering and X-ray diffraction (XRD) indicates that there are double phases in the NTE temperature zone, and the NTE of Mg 1.9 Cu 0.1 P 2 O 7 bulk material comes from the phase transition of α - and β -phase. The present work provides a way to optimize negative thermal expansion property in phase transition typed materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
功能材料
·
热学性能
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2017
·
IF 3.204
Chen Zhu,Jing-Pei Cao,Xiao-Yan Zhao,Tao Xie,Jie Ren,Xian-Yong Wei
Selective cleavage of C O bonds in benzyl phenyl ether (BPE) as a typical lignin α-O-4 ether to produce aromatics is a challenging and attractive topic. Herein, the earth-abundant first-row transition metals, such as Co, Ni and Cu were supported on activated carbon (Co/AC, Ni/AC and Cu/AC) to identify their ability for cleaving C O bond of BPE. Among these catalysts, Ni/AC exhibit highest activity for cleavage of C O bond. The reaction with BPE was carried out at pretty mild condition of 140 °C and 2 MPa H 2 , which is highly selective afforded toluene and phenol as the major products with the optimum yields of 88.5 and 86.5%, respectively. Based on the test, the reaction pathways were proposed. A abundant of dissociated H· atoms on Ni(0) sites forms surface active Ni H species; Ni(0) activates and facilitates cleavage of the C O bond in BPE to form benzyl (C 6 H 5 C·) and phenoxy radicals (C 6 H 5 O·); H· atoms spill from active species Ni H recombined together with C 6 H 5 C· and C 6 H 5 O· forming the products of toluene and phenol, respectively.
研究领域:
化学
·
催化科学
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Cai-Yan Zhang,Ke Cao,Han-Bo Yang,Li-Fang Ding,Junxiao Yang
The Cu(OTf)2/NBS-mediated tandem reaction of 1-cinnamyl alcohol-o-carboranes for the synthesis of C-alkenyl-o-carboranes has been developed. Mechanism studies demonstrated that the Cu(OTf)2-promoted ring opening of oxetane with electron-rich arenes as soft nucleophiles was involved and was the key step for the transformation. This work provided an alternative strategy for the synthesis of C-alkenyl-o-carboranes, which has an important reference for the synthesis of o-carborane derivatives with diversity.
研究领域:
有机化学
·
硼化学
·
合成方法学
·
碳硼烷化学
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DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·
IF 1.7
Yan Jiaqi,Fu Weiwen,You Kuiyi,Zhao Fangfang,Luo He’an
A solvent-free, acid-free, and efficient strategy was developed for the selective preparation of 4-nitro-o-xylene (4-NOX) from the catalytic nitration of o-xylene with NO 2 mediated O 2 over BiCl 3 immobilized silicic acid catalyst (BiCl 3 -SA). The results indicated that the Lewis acid BiCl 3 -SA conjoined NO 2 –O 2 as a composite system synergistically promotes o-xylene conversion and 4-NOX selectivity. Under optimal conditions, 52.4% of o-xylene conversion with 68.4% 4-NOX selectivity was obtained at 35 °C. The characterization demonstrated that the highly dispersed metal Bi species form stable chemical bonds with the SA surface, which can effectively inhibit the loss of metal species and generate abundant acid sites. The developed catalyst is not only inexpensive but also has excellent stability and catalytic performance. Furthermore, a plausible mechanism for the catalytic nitration of o-xylene using NO 2 as a nitration agent over BiCl 3 -SA was proposed. This work provides an eco-friendly and practical protocol for improving desirable 4-NOX selectivity and reducing the discharge of acidic wastewater, with potential application prospects. Graphical abstract
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xuyin Lin,Jinwen Jiang,Jun Wang,Jiaofen Lin,Aikebaier Reheman
ABSTRACT In this study, we used mesoporous silica materials as inorganic carrier and poly(o-phenylenediamine) with more active amino and imino groups as organic ligand to obtain functionalized adsorbent. The composite adsorbent poly(o-phenylenediamine) modified mesoporous composites (MPP) were prepared by loading poly(o-phenylenediamine) onto the surface of the aminated mesoporous material through in-situ polymerization. It was found that the maximum saturation adsorption capacity of MPP reached 225 mg/g when the solution pH, temperature, initial Hg(II) concentration, and adsorption time were 4, 298.15 K, 100 mg/L, and 240 min, respectively. When common interfering ions Zn(II), Ni(II), Cu(II), Ca(II), Mg(II) and Al(III) were present, the adsorption of Hg(II) by MPP still showed good selectivity. The adsorption of Hg(II) by MPP followed quasi-secondary kinetics and the Langmuir adsorption isotherm model, indicating that the adsorption process was chemisorption. In addition, MPP removed up to 81.35% of Hg(II) from industrial wastewater. After five cycles for adsorbent regeneration experiments, the adsorption capacity of MPP could reach 191.67 mg/g, indicating that the adsorbent has good regeneration performance and potential application value for removal of Hg(II).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yang Zheng,Wei Su,Hualong Zhou,Jiaqing Wang,Wenbo Zhang,Yi Xing
To address the problems of difficult degradation of Chlorinated volatile organic compounds (CVOCs) and easy deactivation of catalysts by chlorine poisoning, o-Dichlorobenzene ( o- DCB) was used as a model pollutant, and a shape size-tunable CeCoOx catalyst was designed by Prussian blue analogue (PBA) derivatization, and the nucleation rate of the precursor was controlled by regulating the amount of Polyvinyl pyrrolidone (PVP) added (0–15 g), so that the CC-PVP y catalysts with hexagonal bipyramidal to lamellar gradient structures were successfully prepared, and their structure-efficacy relationship and mechanism were systematically elucidated. The results showed that the appropriate amount of PVP could optimize the crystallinity and size uniformity of the precursor, and the resulting CC-PVP 1 catalyst showed a complete hexagonal bipyramidal structure with maximum specific surface area and pore volume, and the surface was enriched with highly active Co 3+ species and adsorbed oxygen. Mechanistic studies have shown that chlorine poisoning mainly occurs through Cl - occupying the oxygen vacancies, leading to a decrease in the crystallinity of the catalyst, a collapse of the pore structure, a weakening of the redox capacity and a decrease in the number of acid sites. CC-PVP 1 significantly delayed the deactivation by reducing the amount of Cl deposited on the catalyst surface due to its high structural integrity. This study deepens the understanding of the catalytic combustion mechanism of CVOCs and provides a feasible strategy for the development of efficient chlorine-resistant catalysts.
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产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Dong Fei-Long,Liu Zhen-Hua,Jiang Ying,Liang Zhe,Chu Xu,Ma Chun-Hui,Sun Hao,Xie Hai-Ming
TiNb 2 O 7 (TNO) is regarded as a potential fast-charging anode for lithium-ion batteries due to its fast reversible phase transition and safe working potential, but it suffers from unsatisfactory electronic conductivity, sluggish ion kinetics, and poor structural stability under high rates. Herein, tantalum (Ta) with strong Ta–O bonds is doped into TNO to enhance its fast-charging property and structural stability. Proper amount of Ta doping not only increases the interlayer spacing for fast Li + transport, but also improves the electrical conductivity, being successfully proved by experimental analyses. Density functional theory (DFT) calculation verifies that the lattice distortion induced by the incorporation of strong Ta-O bonds can effectively strengthen the structural stability. Notably, in situ X-ray diffraction (XRD) technology reveals that Ta doping relieves volumetric strain during lithiation and de-lithiation. Thus, the optimized Ta 0.1 -TNO sample owns impressive long-term cycling stability even at a high current density of 10C, which delivers a high-capacity retention of 85.12% (a capacity decay of less than 0.01% per cycle) after 1500 cycles. This work provides a fast-charging anode material with superior structural stability for lithium-ion batteries. Graphical abstract
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
·
纳米材料
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-15
·
IF 5.228
Zhang Tingjing,Liang Jianqiang,Wang Panxue,Xu Ying,Wang Yutang,Wei Xinyuan,Fan Mingtao
Phloretin-2′- O -glycosyltransferase (P2′GT) catalyzes the last glycosylation step in the biosynthesis of phloridzin that contributes to the flavor, color and health benefits of apples and processed apple products. In this work, a novel P2′GT of Malus x domestica (Md P2′GT) with a specific activity of 46.82 μkat/Kg protein toward phloretin and uridine diphosphate glucose (UDPG) at an optimal temperature of 30 °C and pH 8.0 was purified from the engineered Pichia pastoris broth to homogeneity by anion exchange chromatography, His-Trap affinity chromatography and gel filtration. The purified Md P2′GT was low N -glycosylated and secreted as a stable dimer with a molecular mass of 70.7 kDa in its native form. Importantly, Md P2′GT also exhibited activity towards quercetin and adenosine diphosphate glucose (ADPG), kaempferol and UDPG, quercetin and UDP-galactose, isoliquiritigenin and UDPG, and luteolin and UDPG, producing only one isoquercitrin, astragalin, hyperoside, isoliquiritin, or cynaroside, respectively. This broad spectrum of activities make Md P2′GT a promising biocatalyst for the industrial preparation of the corresponding polyphenol glycosides, preferably for their subsequent isolation and purification. Besides, Md P2′GT displayed the lowest K m and the highest k cat /K m for phloretin and UDPG compared to all previously reported P2′GTs, making Md P2′GT favor phloridzin synthesis the most.
研究领域:
植物学
·
生物化学
·
食品科学
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DOI
PubMed
高影响因子
Cell Reports
·
2021
·
IF 9.423
Tanjing Song,Qingli Zou,Yingying Yan,Suli Lv,Neng Li,Xuefeng Zhao,Xianyun Ma,Haigang Liu,Borui Tang,Lidong Sun
Summary Histone lysine methylation functions at the interface of the extracellular environment and intracellular gene expression. DOT1L is a versatile histone H3K79 methyltransferase with a prominent role in MLL-fusion leukemia, yet little is known about how DOT1L responds to extracellular stimuli. Here, we report that DOT1L protein stability is regulated by the extracellular glucose level through the hexosamine biosynthetic pathway (HBP). Mechanistically, DOT1L is O-GlcNAcylated at evolutionarily conserved S1511 in its C terminus. We identify UBE3C as a DOT1L E3 ubiquitin ligase promoting DOT1L degradation whose interaction with DOT1L is susceptible to O-GlcNAcylation. Consequently, HBP enhances H3K79 methylation and expression of critical DOT1L target genes such as HOXA9/MEIS1, promoting cell proliferation in MLL-fusion leukemia. Inhibiting HBP or O-GlcNAc transferase (OGT) increases cellular sensitivity to DOT1L inhibitor. Overall, our work uncovers O-GlcNAcylation and UBE3C as critical determinants of DOT1L protein abundance, revealing a mechanism by which glucose metabolism affects malignancy progression through histone methylation.
研究领域:
癌症生物学
·
分子生物学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2026
·
IF 4.4
Chi Wang,Juncheng Wu,Yi Cheng,Jinshu Tian,Chong Hao,Guan Sheng,Lingkun Wu,Yonghe Li,Zailai Xie
Supported boron oxide catalysts show great potential in propane oxidative dehydrogenation yet suffer severe hydrolytic deactivation at high temperatures. Here, an interfacial bond gradient strategy is proposed to stabilize boron-based catalysts. CeO 2 anchored on γ-Al 2 O 3 modulates local bonding and firmly immobilizes active boron species. The catalyst achieves over 40% propane conversion, 80% olefin selectivity and superior stability within 200 h. Formed B-O-Ce interfaces trigger oriented electron transfer and enhance surface hydrophobicity, raising hydrolysis activation energy and suppressing active site loss. This interfacial engineering offers a universal route to design robust catalysts for alkane transformation.
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产品关联
DOI
高影响因子
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