LWT-FOOD SCIENCE AND TECHNOLOGY
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2022
·
IF 6.056
Hanchen Zhou,Yaqin Liu,Jihong Yang,Hui Wang,Yong Ding,Pandeng Lei
Taiping Houkui green tea is well-known in China for its noble aroma. Six tea strains from the Shidacha population (the predominant raw materials for Taiping Houkui green tea) and three other varieties were used to prepare green teas via the conventional techniques of Taiping Houkui green tea manufacture. Aroma evaluation confirmed that green teas produced from Shidacha strains possessed good aroma qualities. A total of ninety-six volatile compounds were identified and quantified. Hierarchical cluster analysis separated the nine green teas into three groups, and principal component analysis identified 16 volatiles (with variance importance values greater than one) that contributed to the separation. Thirty-three volatiles with odor activity values above one were identified, the highest twenty being methyl epi-jasmonate, octanal, ( Z )-jasmone, β-ionone, geraniol, indole, methyl jasmonate, nonanal, decanal, linalool, benzeneacetaldehyde, phenylethyl alcohol, α-ionone, 1-octen-3-ol, cedrol, benzaldehyde, dimethyl sulfide, hexanal, 3-methylbutanal, and β-cyclocitral. All of these may be key odorants in Taiping Houkui green tea. This study suggests that the unique aroma of Taiping Houkui green tea depends both on a premium tea plant and the manufacturing process.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Yuehuan Li,Lang Shi,Yu Mao,Yu Zhang,Hongqing Wang
It is still a challenge for photocatalytic reduction of uranyl and maintaining catalyst stability under aerobic conditions. Herein, a catalyst of sodium–potassium co-doped g-C 3 N 4 (CD-NaK) was obtained to remove Hexavalent Uranium (U(VI)) by photocatalytic reduction under aerobic conditions. And the CD-NaK was characterized by XRD, XPS and other methods. Furthermore, DFT calculations and XRD revealed that Na was doped in-plane while K was doped in-plane and interlayer, enhancing holes and electrons separation performance. Moreover, the removal rate of U(VI) could be achieved nearly 100% after 20 mins of visible irradiation in the presence of air over CD-NaK(30). The photocatalytic activity has the order: CD-NaK(30) > SD-Na > SD-K > CN. Additionally, when the atmosphere of the reaction system was air, the photocatalytic activity of CD-NaK(30) to uranyl was 4.6 times higher than that of pure nitrogen atmosphere in the present of benzyl alcohol, and CD-NaK(30) displayed good reusability and stability with the removal rate > 96% even after five cycles. Interestingly, the effect of the amount of oxygen on catalytic reduction and the role of oxygen were elucidated. Finally, a novel uranyl reduction mechanism has been supposed.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Aiqun Kong,Menghui Liu,Houjun Zhang,Zifan Cao,Jinli Zhang,Wei Li,You Han,Yan Fu
Cyclohexanecarboxylic acid (CCA), an important chemical and pharmaceutical intermediate, is commonly produced from thermal catalytic hydrogenation of benzoic acid (BA) under high temperature and pressure. Herein, electrocatalytic hydrogenation (ECH) for highly selective conversion of BA into CCA using carbon fibers with different graphitization degree (carbon fiber paper (CFP), carbon fiber cloth (CFC)) supported commercial platinum carbon (Pt/C) electrode was reported for the first time without using external H 2 . Our experimental results show that, at room temperature and 1 atm, the BA conversion and the CCA selectivity are both as high as 100% in 0.05 M H 2 SO 4 over carbon fiber paper (CFP)-supported Pt/C (Pt/C/CFP). Meanwhile, Pt/C/CFP electrode still maintains outstanding stability after 10 reaction cycles. In situ Raman results and theoretical calculations reveal that the adsorption strength of BA over Pt/C/carbon fibers electrode varies with the graphitization degree of carbon fibers along with the applied potential. The superior ECH performance of the Pt/C/CFP is mainly attributed to the high dispersity of Pt/C catalysts on CFP as well as unique electronic interaction, which improved the adsorption and activation of BA. Typically, CFP with few defects can induce the accumulation of electrons around the Pt regions and enhance the electron-deficient aromatic adsorption thus improving the ECH performance of Pt/C/CFP, which is the opposite for CFC with more defects.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 9
·1943-1955
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IF 7.779
Yang Yang,Xiuzhen Zheng,Jiafang Liu,Zhulin Qi,Tianyue Su,Chun Cai,Xianliang Fu,Sugang Meng,Shifu Chen
To achieve high photocatalytic efficiency of H2 evolution, promoting the utilization rate of photogenerated charge carriers by photocatalytic synergistic reaction is an efficient strategy. In this work, Co3S4/Zn0.5Cd0.5S nanocomposites with Co3S4 derived from ZIF-67 were successfully prepared through a simple hydrothermal method. Under visible light irradiation, Co3S4/Zn0.5Cd0.5S exhibited high photocatalytic activities in a H2 production system coupled with selective oxidation of benzyl alcohol. Moreover, 3% Co3S4/Zn0.5Cd0.5S showed the optimal activity (7.67 mmol g−1 h−1), greatly improved compared to that of Zn0.5Cd0.5S (1.62 mmol g−1 h−1). The reasons for the improved photocatalytic performance were seriously investigated by a variety of measurements and can be attributed to the enhanced visible light absorption and more efficient electron–hole pair separation. This study provides a good strategy to construct photocatalysts with metal–organic frameworks (MOFs) and efficient charge separation for highly efficient H2 production.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Fangshu Xing,Renyou Zeng,Chuchu Cheng,Qiuwen Liu,Caijin Huang
Efficient aromatic alcohol oxidation with simultaneous H 2 evolution under aqueous conditions is achieved in a polyoxometalate (POM)-incorporated ZnIn 2 S 4 dual-functional photocatalytic system. The synergy between HPM and ZIS contributes to the formation of a Z-type heterojunction structure and thus enhances redox capacity. Moreover, the sub-nanometer size of POM clusters endows molecular-level interfacial contact, which acts as an "electron bridge" ensuring faster interfacial charge transfer kinetics. Therefore, an impressive nearly 100% yield of benzaldehyde and 10.6 mmol·g −1 ·h −1 H 2 -evolution rate are observed for POM/ZIS nanocomposites even under an anaerobic atmosphere with water as the solvent. This is the first application of POM-based materials in the anaerobic oxidation of benzyl alcohol with concomitant H 2 production. This study expands the possibilities for designing multifunctional POM-based photocatalysts for economic and ecological photoredox applications.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Fu Dongmei,Xie Dazhi,Wang Fei,Chen Bin,Wang Zhen,Peng Fei
T cell activation is vital for immune response initiation and modulation. Except for the strength of the interaction between T cell receptors (TCR) and peptides on major histocompatibility complex molecules (MHC), mechanical force, mediated by professional mechanosensitive ion channels, contributes to activating T cells. The intrinsic characteristic of synthetic micro/nanomotors that convert diverse energy sources into physical movement and force, opening up new possibilities for T cell regulation. In this work, Pd/Au nanomotors with spiky morphology were fabricated, and in the presence of low concentrations of hydrogen peroxide fuel, the motors exhibited continuous locomotion in the cellular biological environment. Physical cues (force and pressure) generated by the dynamic performance are sensed by mechanosensitive ion channels of T cells and trigger Ca2+ influx and subsequent activation. The successful demonstration that mechanical signals generated in the bio microenvironment can potentiate T cells activation, represents a potential approach for cell-based cancer immunotherapy.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Ming-Yu Qi,Qiong Lin,Zi-Rong Tang,Yi-Jun Xu
Coupling CO 2 photoreduction with selective organic synthesis offers a promising modus operandi to enable simultaneous utilization of photogenerated electrons and holes to realize solar fuels production and chemicals synthesis. Herein, we report a bifunctional zero-dimensional cadmium sulfide quantum dots-two-dimensional titanium dioxide nanosheets (CdS/TNS) heterostructure for photoredox-catalyzed coupling of C–C bond synthesis via selective oxidation of benzyl alcohol with CO 2 photoreduction to CO under visible light. The compositing heterointerface is beneficial for the adsorption and activation of CO 2 , thereby promoting the photoreduction of CO 2 . Remarkably, the synergistic interaction between CdS and TNS tunes the selectivity of benzyl alcohol oxidation from carbonyl compound to the C–C coupled products. Mechanistic studies unveil that the generation of C–C coupled products processes via key radical •CH(OH)Ph intermediates. Theoretical simulations reveal that the weaker adsorption of •CH(OH)Ph radical over CdS/TNS than bare CdS contributes to the formation of highly selective C–C coupled products. The findings are expected to offer instructive guidance on rationally designing the dual-functional catalysts with efficient photoredox-catalyzed coupling reaction systems for integrating CO 2 reduction with selective organic transformations.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Qifeng Chen,Guoming Gao,Huailin Fan,Jie Zheng,Lulu Ma,Yanyu Ding,Yanfen Fang,Ran Duan,Xiaofeng Cao,Yanchuan Guo,Dongge Ma,Xun Hu
The surface property of a photocatalyst, including surface acid sites and oxygen vacancies, plays a pivotal role in photocatalytic organic synthesis reactions. Benzoin isopropyl ether (BIE) is usually produced via polycondensation of benzaldehyde and catalyzed with highly toxic cyanide. Here, we report a green photocatalytic approach for the selective synthesis of BIE over WO3 driven by a green-light-emitting diode. The improved photocatalytic activity can be attributed to the synergy of oxygen vacancies (VOs) and acid sites over N-doped WO3 nanobelts. The results revealed that reactant molecules were predominantly adsorbed and activated on surface oxygen vacancies (VOSs) and the Brønsted acid promoted the etherification reaction; the introduction of VOs and nitrogen altered the band structure and electronic properties, resulting in improved photocatalytic activity. Our work provides an efficient approach to the selective photocatalytic synthesis of organics over photocatalysts with finely tuned surface properties and band structures via defect and doping engineering.
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JOURNAL OF CONTROLLED RELEASE
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2022
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IF 11.467
Hong Liu,Zhitao Hu,Haolin Chen,Yanzi Yan,Zhicheng Le,Cong Wei,Wenqiang Cao,Tianfeng Chen,Yongming Chen,Lixin Liu
Vaccination with subunit nanovaccines is a promising strategy to combat virus infection and tumor development. However, immunogenicity of present nanovaccines is still unsatisfied for clinical translation. Here, we developed a nanovaccine loading a STING agonist, 2′3′-cGAMP and, a model subunit antigen, OVA , by using a well-defined self-degradable poly(β-amino ester)s to treat B16F10-OVA melanoma tumors. The polymer underwent slow hydrolysis at pH 5.5 but self-degraded induced by the amino groups along the polyester chain at pH > 6.5. It is shown that the self-degradation products facilitated the release of 2′3′-cGAMP and OVA from early endolysome to the cytosol, where the two components strongly activated CD8 + T lymphocytes (CTLs) and significantly enhanced Ifn1, TNF , Cxcl9, and Cxcl10 expression. In turn, the tumor microenvironment was remolded from cold to hot. Moreover, the nanovaccine could be quickly drained to sentinel lymph nodes after intratumoral injection. The nanovaccine with strong immunogenicity also could reduce the side effects of systemic inflammatory reaction caused by molecular 2′3′-cGAMP. The tumor progression of animals was inhibited, and their survival rates increased significantly. Thus, the multifunctional biodegradable material provided a new delivery system for a cancer vaccine to translate to clinics.
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Nano Research
·
2023
·Vol. 16
·期 7
·9116-9124
·
IF 9.9
Si Lianxi,Li Hui,Zhang Yu,Zhang Donghao,An Xiaowei,Yao Mengmeng,Shao Yuanyuan,Zhu Jesse,Hu Shi
Ultrathin Pd nanosheets (NSs) have great advantages in catalysis due to their large specific surface area and high percentage of under-coordinated atoms. However, the electrochemical performance still can be improved via composition-controllable growth of their solid solution. Herein, seeded alloying strategy was proposed to synthesize Pd-Cu solid solution from Pd NSs and Pd-Cu nanostructures with tunable molar ratios obtained by changing the amount of Cu precursor. As compared to the pristine Pd NSs, the Pd-Cu solid solution shows significantly enhanced methanol oxidation reaction (MOR) performance over those of Pd NSs and homemade Pd/C as the incorporation of Cu weakens the adsorption of CO intermediate on Pd in the MOR process. The choice of template is pivotal to the growth, as a shape-dependent behavior could be identified in the alloying of Cu with Pd nanosheets enclosed by {111} and {100} facets, Pd nanocubes enclosed by {100} facet, and Pd nano-tetrahedrons enclosed by {111} facet. The Pd-Cu solid solution with tunable composition can only be obtained from Pd NSs and the shape-dependent alloying process is mainly determined by the diffusion barrier and the minimum diffusion depth of the different facets.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Zhong-Hui Zheng,Somboon Chaemchuen,Jun-Fei Gu,Jing Hang,Wei Sang,Ji-Chao Wang,Ye Yuan,Cheng Chen
The catalytic alcohol dehydrogenation to carboxylic acids has been demonstrated as an atom-economic and environmental-friendly synthetic method. However, the reported catalysts either require relatively complicated synthesis or exhibit high activity only in the presence of a solvent. Therefore, it is still in high demand to obtain catalysts that feature facile synthesis and perform well even without any solvent. Herein, a series of nanostructured bimetallic Zn/Co species embedded in N-doped hierarchical porous carbon were fabricated in a facile and green manner. More significantly, the best-performing material (Zn/Co@NC-800) was identified as the first heterogeneous catalyst to enable this transformation under solvent-free conditions. Moreover, the as-prepared composites were comprehensively investigated to determine their structural and morphological properties, which rationalized the superiority of Zn/Co@NC-800 over the other synthesized materials. Further studies signified that Co sites (both Co 0 and Co 2+ ) and N species (mainly pyridinic N) were probably involved in this process, functioning as the Lewis acid site and basic site, respectively. Hopefully, this study could provide a simple and sustainable method for carboxylic acid synthesis.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Xiaojie Geng,Qing Li,Xinlei Wang,Lin Zhu,Bowen Wang,Fuping Zheng,Guangnan Wang,Erbao Chen,Yuhang Zhang
Environmental factors are the key factors affecting the fermentation of traditional fermented foods . However, the effects of environmental factors on flavor metabolism of Laobaigan-flavor Baijiu have not been described. In this study, we applied HS-SPME–GC–MS and physicochemical parameters analysis to reveal the dynamic of volatile flavor compounds and environmental factors, and indicated the effects of environmental factors on the succession of volatile flavor compounds. The fermentation process was divided into three stages: alcohols (628 mg/kg) and acids reached higher in the early stage (0–8 days), while aldehydes existed more in the middle stage (10–17 days) and esters accumulated until the middle (2501 mg/kg) or later (1168 mg/kg) stages (20–29 days). Meanwhile, environmental factors changed rapidly ( p < 0.05), and significantly correlated with the formation of flavor compounds at different stages. Among them, pH and protein content were significantly related to esters (|r| > 0.6) esterified by monocarboxylic acid in the middle stage, while esters (|r| > 0.7) synthesized with hydroxyl acid had significant relations with temperature and moisture in the later stage. Our study indicated the correlations between the dynamic of environmental factors and the succession of volatile flavor compounds, and it provided a potential approach to manage environmental factors to improve the fermentation of Baijiu.
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危险品化学品经营许可证（带存储）