PROCESS BIOCHEMISTRY
·
2022
·
IF 4.885
Yaling He,Hui Chen,Ziyang Ye,Xinmiao Zhang,Hongling Ye,Ming Ye
To prepare zinc and selenium modified polysaccharides derivatives (ZnLEP-1a and SeLEP-1a), a novel polysaccharide (LEP-1a) isolated from Lachnum YM38 was chosen. Following that, the structural characterization and in vitro bioactivities of LEP-1, ZnLEP-1a and SeLEP-1a were investigated. Results revealed that LEP-1a had a molecular weight of 5.69 × 10 4 Da and was composed of mannose , galactose and glucose. The linkage types of LEP-1a were proved to be (1→)-α- D -Manp, (1→3)-α- D -Manp, (1→2)-α- D -Galp, (1→2)-α- D -Glcp, (1→2,6)-α- D -Manp. Zinc content of ZnLEP-1a was 0.69 mg/g, while selenium content of SeLEP-1a was 206.99 µg/g. Compared with LEP-1a, ZnLEP-1a and SeLEP-1a had a lower molecular weight, same monosaccharides in different molar ratios. The results of FT-IR, DSC , NMR, SEM and AFM suggested that there were obvious changes in structural characteristics after LEP-1a was modified with zinc and selenium. ZnLEP-1a and SeLEP-1a had stronger antioxidant, hypoglycemic, antitumor activities in vitro in comparison with LEP-1a. As a result, ZnLEP-1a and SeLEP-1a showed great potential to develop into a natural antioxidant, hypoglycemic and low-toxic antitumor drug.
研究领域:
生物化学
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药理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhongming Wang,Xiong Shen,Jinhe Wei,Lin Chen,Fei Hu,Fanfan Qi,Qiuyun Ouyang
Carbon quantum dots (CQDs) were prepared by a thermal cracking method; amino-modified CQDs (NH2-CQDs) were synthesized by a hydrothermal method, and zinc-reduced CQDs (Zn-CQDs) were synthesized by a mild method. Optical properties and stability are two key issues for further applications of CQDs. In this study, we report a simple and effective method to simultaneously improve the optical properties and stability of CQDs. We generated Zn-CQDs by reacting zinc powder with CQD solution, which was operated under mild conditions and completed in a short time. These three materials were placed in an air environment for 48 h. The results show significantly improved moisture resistance of Zn-CQDs compared to the other two materials. The exciton binding energy of Zn-CQDs was calculated by the temperature-dependent fluorescence emission spectra to be 208.7 meV, which is much higher than those of 49.9 meV for CQDs and 46.6 meV for (NH2)-CQDs. This indicates that Zn-CQDs exhibit more stable internal exciton states, a higher degree of crystal ordering, and better moisture resistance. Due to the good moisture resistance and excellent photoluminescence properties of Zn-CQDs, their solid powders were used as color conversion materials for making fluorescence-excited LED devices. Finally, a blue light-emitting LED with a stable and bright color was obtained.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 6
·2526-2533
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IF 3.5
Jia-Min Lyu,Shen Yu,Zhan Liu,He-You Du,Ming-Hui Sun,Chun-Mu Guo,Yi-Long Wang,Yu Li,Li-Hua Chen,Bao-Lian Su
Excessive emission of CO2 into the atmosphere has severely impacted the global ecological environment. Converting CO2 into valuable chemicals and fuels is of great significance for sustainable development. However, low activity and undesirable selectivity often result from the inherent inertness of CO2. Herein, K- or/and Zn-modified Fe-based catalysts were prepared by an incipient-wetness impregnation method for CO2 hydrogenation via a cascade reaction. The results indicate that K species exist as K2O while Zn species exist as ZnFe2O4. In the CO2 hydrogenation pathway, K2O facilitates the adsorption of CO2 and restrains the adsorption of H2, accelerating the transformation of CO2 into C2–C4 olefins rather than paraffins while Zn species promote the dispersion of Fe species, leading to improved activity. Synergistically, a K- and Zn-modified Fe-based catalyst (2Zn–10K–Fe/Al) shows excellent catalytic CO2 hydrogenation activity, achieving a CO2 conversion of 77% which is 1.8 times that (42%) of the unmodified Fe-based catalyst (Fe/Al). Our catalyst also shows a significantly promoted selectivity to C2–C4 olefins of 17% in comparison with the Fe/Al catalyst (0%). It is envisioned that such a binary effect of elements might contribute to the low-cost and industrial production of Fe-based catalysts for selective CO2 conversion.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Meng Huang,Jinwei Chen,Haiyan Tang,Yi Jiao,Jie Zhang,Gang Wang,Ruilin Wang
The indoor low-concentration formaldehyde (HCHO) removal in cobalt-based catalysts is still a “hot potato”. In this work, metal–organic-frameworks (MOF)-derived and Zinc (Zn)-modulated new cobalt nanoparticles catalyst (CZ-Co@NC-800) was designed and prepared. The CZ-Co@NC-800 performed outstanding elimination activities for ~1 ppm HCHO at 25 °C. In the static test condition, it achieves complete HCHO removal in 3 h at a relative humidity (RH) of ~55%. Moreover, 90.18% HCHO removal ratio is held after five recycle tests. In the dynamic test condition, it remains the characteristic to eliminate around 95.89% of HCHO within 8 h under an RH of ~55% and a gas hourly space velocity (GHSV) of ~150,000 mL·h −1 g −1 . Such advanced results should be ascribed to large specific surface area bringing about more cobalt active sites; and it is also because residual Zn metal affects the electronic structure of CZ-Co@NC-800 and enhance the surface charge transfer rate, thus the activation and dissociation ability of oxygen is promoted. Besides, a short HCHO reaction path over CZ-Co@NC-800 which was clarified by the In situ DRIFTs is also a reason for excellent catalytic performance. This work represents a crucial addition to expand the family of cobalt-based catalysts for indoor HCHO elimination.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Chen Zhang,Yangyang Li,Yingjie Li,Weihao Zhang,Xiaoting Wang,Xiaojun He,Moxin Yu
The discovery of efficient carbonaceous adsorbents for the removal of organic dyes is a meaningful subject. In this study, hierarchical porous carbon materials (HPCMs) were synthesized from petroleum pitch through template strategy coupled with in-situ chemical activation, and the optimal HPCM was further modified by Zn(II) to get modified HPCM (MHPCM). Their properties and structures were characterized, and their adsorption performances for two typical dyes, methylene blue (MB) and direct black 38 (DB 38), were examined. The as-prepared HPCMs and MHPCM exhibit high specific surface area with hierarchical pore structure, abundant oxygen-containing group, and distinct layered structure. As an adsorbent for dye removals, the MHPCM shows excellent performance with its Langmuir saturated adsorption capacity being 1585.7 and 438.6 mg/g for MB and DB 38, respectively. This is mainly due to the large surface area and hierarchical pore structure of HPCMs, as well as the modification effect of Zn(II). This work provides an efficient strategy for the synthesis of carbonaceous adsorbents used in the adsorptive removal of different molecular size dyes, as well as a new approach for the valuable use of low-cost petroleum pitch.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Asian Journal of Organic Chemistry
·
2021
·Vol. 11
·期 2
·e202100631
·
IF 3.319
Guangpeng Xu,Liujie Bing,Jihong Sun,Bingying Jia,Shiyang Bai
Graphical The BMMs-based catalysts for asymmetric aldol reaction were prepared via Zn-grafting and Z-immobilization into the inner mesopores of the BMMs support. The SAXS demonstrations combing with other characterizations deeply elucidated the associations between fractal features and their catalytic performances, in which, the synthesized Z 2 ZnBMMs-100 presented the similar catalytic yields but much higher enantioselectivity than the homogeneous catalysts. The three bipyridine-proline chiral ligands (Z) with different structural units as highly active species were successfully introduced on Zn-modified bimodal mesoporous silicas (BMMs). The representative heterogeneous catalysts (ZZnBMMs-n) containing different molar ratios of Z/Zn (5, 20, 50, 100, 200%) were prepared, and their catalytic performances were evaluated in the asymmetric aldol reactions between p-nitrobenzaldehyde and cyclohexanone, showing the satisfactory activities (yields) and good stereoselectivity ( dr and ee ). Meanwhile, their microstructural features and physicochemical properties were characterized by various methods. Particularly, the fractal evolution, the pair distance distribution function, and the Porod plots of the ZZnBMMs catalysts were demonstrated by SAXS analysis. The results revealed that the interfacial layer thickness and their mass fractal ( D m ) value gradually increased with the enhanced molar ratios of Z/Zn, along with the decrease of pore size and densification of volume, suggesting the successful Z-grafting into the mesoporous channels of Zn-modified matrixes. The essential relationships between the fractal features and their catalytic performance (yield, dr and ee ) were explored, showing the larger the D m values, the better catalytic performance. Besides, the uniform distributions of Zn and S elements in ZZnBMMs catalysts and the formation of enamine-imine intermediates during the asymmetric aldol reactions were confirmed.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2022
·
IF 16.874
Zhengwei Liu,Wanze Tang,Jiayi Liu,Yingying Han,Qinnan Yan,Yuechao Dong,Xiaomei Liu,Dazhi Yang,Guixing Ma,Huiling Cao
A novel sprayable adhesive is established (ZnMet-PF127) by the combination of a thermosensitive hydrogel (Pluronic F127, PF127) and a coordination complex of zinc and metformin (ZnMet). Here we demonstrate that ZnMet-PF127 potently promotes the healing of traumatic skin defect and burn skin injury by promoting cell proliferation, angiogenesis, collagen formation. Furthermore, we find that ZnMet could inhibit reactive oxygen species (ROS) production through activation of autophagy, thereby protecting cell from oxidative stress induced damage and promoting healing of skin wound. ZnMet complex exerts better effects on promoting skin wound healing than ZnCl 2 or metformin alone. ZnMet complex also displays excellent antibacterial activity against Staphylococcus aureus or Escherichia coli, which could reduce the incidence of skin wound infections. Collectively, we demonstrate that sprayable PF127 could be used as a new drug delivery system for treatment of skin injury. The advantages of this sprayable system are obvious: (1) It is convenient to use; (2) The hydrogel can cover irregular skin defect sites evenly in a liquid state. In combination with this system, we establish a novel sprayable adhesive (ZnMet-PF127) and demonstrate that it is a potential clinical treatment for traumatic skin defect and burn skin injury.
研究领域:
药剂学
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伤口愈合
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材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）