FOOD CHEMISTRY
·
2024
·
IF 8.5
Teng Liu,Yumin Niu,Kexin Cheng,Qichao Fei,Dengyong Liu
The present study aimed to elucidate the pathway of pigment formation and identify the source of antioxidant activity during sugar smoking. Building upon previous research, this investigation replicated the sucrose cleavage process involved in sugar-smoking through model reactions to obtain distinct model reaction products. The products were analyzed using various techniques such as ultraviolet–visible spectrometry, Fourier-transform infrared spectroscopy, high-performance liquid chromatography, and high-performance liquid chromatography-tandem mass spectrometry. The findings revealed that the pyrolysis of sucrose at 330 °C yielded glucose and fructose, with fructose pyrolysis producing significantly more 5-HMF than glucose. Moreover, the antioxidant capacity of 5-HMF was found to make a substantial contribution. The primary source of 5-HMF was identified as fructose resulting from the cleavage of sucrose at 330 °C, while the primary pathway for the formation of the sugar-smoking pigment 5-GGMF was attributed to the intermolecular dehydration of 5-HMF and glucose at 150 °C.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 12
·4260-4270
·
IF 5.287
He Huang,Chuanhui Zhang,Lei Wang,Genqin Li,Liang Song,Guangci Li,Sifu Tang,Xuebing Li
A series of HZSM-5 supported MnOx catalysts with different manganese contents were prepared by an incipient impregnation method and tested for the catalytic oxidation of toluene. The catalytic results indicate that 10% MnOx/HZSM-5 exhibits the optimum catalytic activity, excellent catalytic durability in dry conditions and high regeneration capability in humid conditions. The dispersion of MnOx species on the HZSM-5 surface significantly reduces coke formation and simultaneously efficiently accelerates the oxidative decomposition of coke deposition during toluene catalytic oxidation. An obvious cooperative action is present on the MnOx/HZSM-5 catalysts for the catalytic oxidation of toluene, which is originally attributed to the excellent toluene adsorption capacity and trapping ability of HZSM-5 as well as the superior redox ability of the MnOx species. The correlation between characterizations and the catalytic results reveals that the mesoporous structure and low-temperature reducibility of MnOx are key factors responsible for the catalytic performance of toluene oxidation. Moreover, the Brønsted acid sites of the HZSM-5 zeolite, as active promoters, play a significant role in the catalytic oxidation of toluene through a comparative analysis with SiO2 and Al2O3 supported MnOx catalysts. The existence of a cooperative action between the redox ability of the MnOx species and the acidic properties of the HZSM-5 zeolite in the MnOx/HZSM-5 catalysts results in a high catalytic activity for the reaction.
研究领域:
催化化学
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环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yinchun Hu,Hui Yang,Renhu Wang,Menglan Duan
MOF-5 was prepared by hydrothermal method and Ag@MOF-5 nanoplates were obtained to improve the antibacterial activity and dispersion of Ag nanoparticles . MOF-5 and Ag@MOF-5 were characterized by scanning electron microscope (SEM), high-resolution transmission electron microscope and energy spectrum (HR-TEM&EDS), X-ray diffraction (XRD), infrared spectrum (FTIR) and thermal gravimetric analysis (TGA). MOF-5 was flaky crystals accumulated and complexed to form cube-like crystalline particles with the size of 20–50 micrometers, and it was destroyed in the process of loading nano-silver particles. Ag@MOF-5 nanoplates were nanoscale sheets, and 3–5 nm Ag nanoparticles were uniformly dispersed and loaded on nanoplates of MOF-5. The content of silver nanoparticles reached 13 wt% of Ag@MOF-5 total weight. The results of antibacterial experiment indicated that antibacterial ability of MOF-5 was limited, while Ag@MOF-5 showed good antibacterial ability to Escherichia coli and Staphylococcus aureus.
研究领域:
材料科学
·
微生物学
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产品关联
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2019
·Vol. 43
·期 1
·67-73
·
IF 2.371
Xu Qianqian,Zheng Zhaojuan,Zou Lihua,Zhang Chen,Yang Fen,Zhou Kaijie,Ouyang Jia
Currently, biotransformation of 5-hydroxymethylfurfural (HMF) into a series of high-value bio-based platform chemicals is massively studied. In this study, selective biooxidation of HMF to 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) by Pseudomonas putida KT2440 with superior titer, yield, and productivity was reported. The biocatalytic performances of P. putida KT2440 were optimized separately. Under optimal conditions, 100% yield of HMFCA was obtained when HMF concentration was less than 150 mM, while the maximum concentration of 155 mM was achieved from 160 mM HMF in 12 h. P. putida KT2440 was highly tolerate to HMF, up to 190 mM. Besides, it was capable of selective oxidation of other furan aldehydes to the corresponding carboxylic acids with good yield of 100%. This study further demonstrates the potential of P. putida KT2440 as a biocatalyst for biomass conversion, as this strain has been proved the capacity to convert and utilize many kinds of biomass-derived sugars and ligin-derived aromatic compounds.
研究领域:
生物技术
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生物化学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Fan Wang,Ziliang Yuan,Bing Liu,Shaohua Chen,Zehui Zhang
In this study, a new ruthenium catalyst was used for the oxidation of biomass derived 5-hydroxymethylfurfural (HMF) under mild conditions, which was prepared by the exchange of Ru 3+ with H + in the structure of the zirconium phosphate (ZrP). The as-prepared ZrP–Ru catalyst showed high catalytic activity towards the oxidation of HMF, affording 100% of HMF conversion at 130 °C after 12 h under atmospheric oxygen pressure. 2,5-Furandicarboxylic acid (FDCA) and 2,5-diformylfuran (DFF) were detected to be the major oxidation products.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2018
·Vol. 143
·期 9
·2051-2056
·
IF 3.864
Yin Yang,Guoqing Yang,Hongfei Chen,Hui Zhang,Jiu-Ju Feng,Chenxin Cai
The levels of 5-methylcytosine (5-mC) and 5-hydroxymethylcytosine (5-hmC) in DNA (5-mC-DNA and 5-hmC-DNA) are strongly correlated with cancer occurrence and development. The ability to distinguish and quantitatively detect them is important for cancer research. We have developed a hybridization chain reaction (HCR)-based electrochemical assay for the signal-amplified detection of the relative contents of 5-mC-DNA and 5-hmC-DNA. The DNA duplexes (containing 5-mC-DNA and 5-hmC-DNA with different percentages) were modified on a gold electrode. Electroactive [Ru(NH3)6]3+ (RuHex) was used as the signal reporter, because it binds to DNA double strands. The duplexes can be cleaved by MspJI endonuclease without HCR, and result in a small peak current. However, the cleavage can be blocked after the 5-hmC-DNA duplex is converted to β-glucosyl-5-hydroxymethylcytosine (β-glu-5-hmC) by T4 β-glucosyltransferase (T4 β-GT), and with the addition of helper DNA, a long double-helix DNA was formed through HCR. A significantly amplified peak current can be achieved due to the adsorption of numerous RuHex. The electrochemical signal of RuHex is correlated to the content of 5-hmC-DNA. Upon fixing the total quantity of 5-mC-DNA and 5-hmC-DNA on the electrode, the signals increase with the increase in the percentage of 5-hmC-DNA for the HCR. With this assay, a detection limit of 0.05% for 5-hmC-DNA was achieved.
研究领域:
生物化学
·
分子生物学
·
癌症研究
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Yuexin Peng,Ling Zhang,Yiwen Jiang,Shichao Han,Qiuyan Zhu,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion is considered as an efficient and economic technology to remove VOCs, and Al-ZSM-5 zeolite supported palladium catalysts (Pd/Al-ZSM-5) with good performances in this kind of reactions have been reported. In this work, it is found that Fe-ZSM-5 supported palladium catalyst (Pd/Fe-ZSM-5) exhibit higher catalytic activity in toluene combustion than the Pd/Al-ZSM-5, which is strongly related to more Pd 0 active species and higher concentration of absorbed oxygen species of Pd/Fe-ZSM-5 than those of Pd/Al-ZSM-5. More importantly, Pd/Fe-ZSM-5 has a good catalyst life and water-resistant ability, which should be potentially significant for practical applications in environment protection.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Qian Wang,Jie Zhang,Wenlong Jia,Xin Yu,Jiahong Chen,Yong Sun,Zuojun Wei,Shuliang Yang,Xing Tang,Xianhai Zeng,Lu Lin
Generally, 5-hydroxymethylfurfural (HMF) is used as feedstock to produce 2,5-furandicarboxylic acid (FDCA). Whereas, its poor stability in alkaline environment results in low yield of FDCA. By contrast, 5-[(formyloxy)methyl]furfural (FMF), a novel platform compound derived from HMF, with higher thermal and alkaline stability than HMF, is more promising to replace HMF as substrate for the production of FDCA. In this study, FMF was successfully converted into FDCA over MoCuO x by using NaClO as oxidant, undergoing 2,5-diformylfuran (DFF) and 5-hydroxymethylfuran-2-carboxylic acid (HMFCA) as intermediates. Under optimization condition (30 min, 40 °C), 100% yield of FDCA was obtained. Furthermore, it was also demonstrated that the yield of FDCA up to 90% was gained in 5 wt % FMF concentration. Higher oxygen species mobility and lattice oxygen ratio endowed MoCuO x excellent catalytic activity. The synergy of Mo and Cu species in MoCuO x ensured an efficient conversion of HMF to FDCA through synergistic redox couple of Mo 6+ /Mo 5+ and Cu 2+ /Cu + .
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Heng Ban,Youwei Cheng,Lijun Wang,Xi Li
2,5-Furandicarboxylic acid (FDCA) derived from biomass is a versatile platform chemical for producing various degradable polymers, especially polyethylene 2,5-furandicarboxylate (PEF). To reduce the high cost of feedstock, fructose instead of expensive 5-hydroxymethylfurfural (HMF) was used as the feedstock for producing FDCA in the acetic acid (HOAc) solvent by a one-pot, two-step method. Fructose was first catalytically converted into HMF and 5-acetoxymethylfurfural (AMF) in HOAc over the Amberlyst-15 catalyst. After the separation of only Amberlyst-15, the in situ-formed HMF and AMF were further catalytically oxidized to FDCA by air (oxygen) over homogeneous Co/Mn/Br catalysts following the free-radical chain reaction mechanism. HOAc was not only used as the solvent for the dehydration and following oxidation process but also served as the effective co-catalyst for the dehydration of fructose. The effects of catalyst species, dosage, and reaction temperature on the dehydration process and oxidation temperature on FDCA yield and purity were evaluated systematically. Under the optimized reaction conditions, a total yield of HMF and AMF of 50% and a final FDCA yield of 35% were achieved. Combined with experimental results and theoretical calculation, the reaction mechanism for fructose dehydration side reactions and the HMF and AMF oxidation reactions was proposed correspondingly. The proposed two-step, one-pot method using fructose as the starting material is a promising route for the commercial production of FDCA with the simple operation and viable yield.
研究领域:
化学工程
·
生物质转化
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Chaoqun Bian,Qinming Wu,Jian Zhang,Fang Chen,Shuxiang Pan,Liang Wang,Xiangju Meng,Ulrich Müller,Mathias Feyen,Bilge Yilmaz,Hermann Gies,Weiping Zhang,Xinhe Bao,Dirk De Vos,Toshiyuki Yokoi,Takashi Tatsumi,Feng-Shou Xiao
The layered silicate COK-5 has been used for an interlayer expansion reaction with dichlorodimethylsilane (DCDMS) at 180 °C to interconnect neighboring layers, yielding a new and crystalline microporous framework. The samples containing the methyl functional groups in the as-made form and having OH groups in the calcined form were designed as COE-5 and calcined COE-5. These samples were characterized with X-ray diffraction (XRD), N 2 sorption isotherms, inductively coupled plasma optical emission spectrometry (ICP-OES), infrared spectroscopy (IR), high-resolution transmission electron micrograph (HRTEM), thermogravimetry-differential thermal analysis (TG-DTA), and 29 Si and 13 C solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR), as well as the contact angle techniques. XRD patterns and HRTEM images suggest that the sample interlayer spacing has been expanded by nearly 0.5 Å. The N 2 sorption isotherms of the materials show the BET surface areas are 165 m 2 /g for COE-5 and 340 m 2 /g for calcined COE-5. 29 Si and 13 C MAS NMR as well as IR spectroscopy confirm the insertion of the linker group -Si(CH 3 ) 2 - connecting neighboring layers. Interestingly, calcined COE-5 shows enhanced catalytic performance in the acetalisation of glycerol with acetone to produce solketal, compared with COK-5.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2017
·Vol. 10
·期 7
·1436-1447
·
IF 7.226
Jiang Li,Jun-ling Liu,He-yang Liu,Guang-yue Xu,Jun-jie Zhang,Jia-xing Liu,Guang-lin Zhou,Qin Li,Zhi-hao Xu,Yao Fu
Graphical Selective and stable Fe : Selective catalytic hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran over heterogeneous Fe catalysts is demonstrated in batch and continuous flow fixed-bed reactors. The Fe catalyst exhibited excellent stability, which is probably a result of the well-preserved active species and the pore structure of the Fe catalyst in the presence of H 2 . This work provided the first example of selective hydrodeoxygenation of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) over heterogeneous Fe catalysts. A catalyst prepared by the pyrolysis of an Fe-phenanthroline complex on activated carbon at 800 °C was demonstrated to be the most active heterogeneous Fe catalyst. Under the optimal reaction conditions, complete conversion of HMF was achieved with 86.2 % selectivity to DMF. The reaction pathway was investigated thoroughly, and the hydrogenation of the C=O bond in HMF was demonstrated to be the rate-determining step during the hydrodeoxygenation, which could be accelerated greatly by using alcohol solvents as additional H-donors. The excellent stability of the Fe catalyst, which was probably a result of the well-preserved active species and the pore structure of the Fe catalyst in the presence of H 2 , was demonstrated in batch and continuous flow fixed-bed reactors.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yong Sun,Caixia Xiong,Quanchang Liu,Jiaren Zhang,Xing Tang,Xianhai Zeng,Shijie Liu,Lu Lin
Compared to biomass-derived 5-hydroxymethylfurfural (HMF), 5-formyloxymethylfurfural (FMF) is highly potential as feedstock to produce 2, 5-dimethylfuran (DMF) due to its properties of higher stability and enhanced hydrophobicity. Herein, catalytic conversion of FMF to DMF over Ni–Cu bimetallic catalyst with formic acid (FA) as hydrogen donor was investigated. A favorable DMF yield of 71.0% was obtained by catalyst 36Ni-12Cu/SBA-15. The conversion of FMF to DMF was controlled by surface reaction on the catalyst. In addition, catalytic mechanism investigation showed that the excellent catalytic performance and recyclability of catalyst were attributed to the formation of Cu–Ni alloy and its synergistic role. The incorporation of Cu and Ni substantially improved the selectivity of hydrogenolysis toward C–O ester bond. Meanwhile, FMF exhibited a better advantage to substitute HMF for producing DMF over Ni–Cu bimetallic catalyst with formic acid as a hydrogen donor.
研究领域:
化学工程
·
生物质能
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）