CATALYSIS SURVEYS FROM ASIA
·
2023
·Vol. 27
·期 3
·207-216
·
IF 3
Li Shuying,Huang Bin,Jin Changzi,Wang Rui,Jiang Heng,Yang Guang-Sheng,Huang Shengjun
The conversion of ethanol and acetaldehyde to 1,3-butadiene has been an emerging process to produce key chemicals. The preparation of highly efficient catalysts and the understanding of reaction mechanism are current research priority. Herein, mesoporous silica framework confining zirconia (Zr-HMS) was prepared and act as catalyst for 1,3-butadiene production from ethanol and acetaldehyde. The prepared catalysts were characterized by Low-angle X-ray powder diffraction, transmission electron microscopy, N 2 physical adsorption-desorption, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and UV–vis spectra. It has been shown that the Zr-HMS exhibits similar textural properties to supported catalyst (ZrO 2 /HMS). However, regardless of their comparable activities, higher 1,3-butadiene selectivity is obtained over Zr–HMS, which can be due to the different active zirconia species in two catalysts. Mesoporous framework confining character of Zr-HMS can achieve uniformly dispersed zirconia species. Further investigation toward the reaction process has presented new viewpoints for formation and consumption of some typical intermediates and byproducts, which will help to understand the reaction mechanism and construct efficient catalysts for conversion of ethanol and acetaldehyde to 1,3-butadiene.
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Small
·
2023
·Vol. 19
·期 24
·2207557
·
IF 13.3
Xin Zhang,Tao Wang,Cui Wang,René Hübner,Alexander Eychmüller,Jinhua Zhan,Bin Cai
Electrochemical upgrading of ethanol to acetic acid provides a promising strategy to couple with the current hydrogen production from water electrolysis. This work reports the design of a series of bimetallic Pt Hg aerogels, where the PtHg aerogel exhibits a 10.5-times higher mass activity than that of commercial Pt/C toward ethanol oxidation. More impressively, the PtHg aerogel demonstrates nearly 100% selectivity toward the production of acetic acid. The operando infrared spectroscopic studies and nuclear magnetic resonance analysis verify the preferable C2 pathway mechanism during the reaction. This work opens an avenue for the electrochemical synthesis of acetic acid via ethanol electrolysis.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Wu Huizhen,Liu Zhi,Zhang Hu,Xie Shuangnan,Tang Chao,Liu Wei,Li Bin,Chen Piao,Zhang Zihong,Qian Mingrong
Endogenous SEM (SEM end ) naturally occurs in crustacea aquatic products, it confuses the legal verdict of exogenous SEM (SEM ex ) degraded by antibiotic nitrofurazone abuse. In the present study, compound-specific gas phase chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) analysis coupled with a two-step pre-column derivatization was developed for determining the nitrogen stable ratio (δ 15 N) of SEM in shrimp and crab. The optimal derivatization and solid phase extraction (SPE) condition of SEM were screened by Plackett-Burman design and central composite design (CCD) experiment. The nitrogen isotope ratio analysis (NSIRA) of SEM in two types of crustaceans proved that its δ 15 N values significantly decreased from 7.0‰ to 2.0‰ once nitrofurazone being used. Analytical results found that the δ 15 N value of SEM ex in vivo was consistent its nitrofurazone precursor but the value of SEM end was dependent on N-containing components (e.g., tissue protein), ANOVA showed significant difference between two types of SEM (p < 0.05). Based on the δ 15 N variations between SEM itself and its nitrofurazone precursor, tissue protein of crustaceans, the percentages of SEM ex and SEM end can be calculated for its source apportionment in vivo. The limit of detection of SEM is down to 0.21 μg kg −1 and 0.54 μg kg −1 , and the identification lower limit of SEM ex are accurate at 6.27% and 0% for two types of crustaceans. The strategy first realized the independent determination of SEM ex and SEM end in crustacea aquatic products, which explained that high-level SEM in crustaceans can’t as the legal verdict of nitrofurazone abuse in aquaculture.
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Foods
·
2023
·Vol. 12
·期 7
·1455
·
IF 5.2
Junting Yu,Zhilei Zhou,Xibiao Xu,Huan Ren,Min Gong,Zhongwei Ji,Shuangping Liu,Zhiming Hu,Jian Mao
Huangjiuis one of the oldest alcoholic beverages in the world. It is usually made by fermenting grains, and Qu is used as a saccharifying and fermenting agent. In this study, we identified differential carbonyl compounds inHuangjiuwith varying sugar contents from different regions. First, we developed and validated a detection method for volatile carbonyl compounds inHuangjiu, and for optimal extraction, 5 mL ofHuangjiuand 1.3 g/L of O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA) were incubated at 45 °C for 5 min before extracting the volatile carbonyl compounds at 45 °C for 35 min. Second, the targeted quantitative analysis of 50 carbonyl compounds inHuangjiushowed high levels of Strecker aldehydes and furans. Finally, orthogonal projections to latent structures discriminant analysis (OPLS-DA) was used to differentiate betweenHuangjiuwith different sugar contents, raw materials, and region of origin. A total of 19 differential carbonyl compounds (VIP > 1,p< 0.05) were found inHuangjiuwith different sugar contents (semidry and semisweetHuangjiu), and 20 differential carbonyl compounds (VIP > 1,p< 0.05) were found in different raw materials forHuangjiuproduction (rice and nonriceHuangjiu). A total of twenty-two and eight differential carbonyl compounds, with VIP > 1 andp< 0.05, were identified in semidry and semisweetHuangjiufrom different regions (Zhejiang, Jiangsu, Shanghai, and Fujian), respectively.Keywords:Huangjiu;carbonyl compounds;PFBHA;targeted metabolomics;OPLS-DA
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Foods
·
2022
·Vol. 11
·期 24
·3997
·
IF 5.561
Youyou Yang,Jing Li,Jiangtao Xing,Weihai Xing,Chaohua Tang,Zhenghua Rao,Junmin Zhang
Volatile compounds play vital roles in food sensory attributes and food quality. An analysis of volatile compounds could illustrate the sensory attributes at the microscale level. Here, untargeted profiling approaches for volatiles in five most-consumed meat species were established using headspace SPME-GC/high resolution Orbitrap MS. An extended high-resolution database of meat volatile compounds was established to enhance the qualification accuracy. Using sulfur-containing compounds, aldehydes, and ketones as the research model, the parameters including fiber coating types, extraction temperature, extraction time, and desorbing time were optimized. Principle component analysis, volcano analysis and partial least squares discriminant analysis were applied to run the classification and the selection of discriminant markers between meat varieties, respectively. Different varieties could be largely distinguished according to the volatiles’ profiles. 1-Octen-3-ol, 1-octen-3-one, 2-pentyl furan and some other furans degraded from n-6 fatty acids would contribute to distinguishing duck meat from other categories, while methyl esters mainly from oleic acid as well as dimethyl sulfoxide and carbon disulfide possibly produced from the sulfur-containing amino acids contributed to the discrimination of beef. Therefore, volatiles’ profiling not only could interpret the aroma style in meat but also could be another promising method for meat differentiation and authentication.Keywords:differentiation;GC-HRMS;SPME;statistical analysis;untargeted profiling;volatiles
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ACS Catalysis
·
2023
·
IF 12.9
Yaming Hao,Jili Li,Xueting Cao,Lingshen Meng,Jianxiang Wu,Xuejing Yang,Yefei Li,Zhipan Liu,Ming Gong
The paired electrolysis via anodic organic oxidation and cathodic hydrogen evolution has been an emerging hydrogen production technology with high efficiency and high values. Nickel oxyhydroxide is a special electrocatalyst that is capable of selectively oxidizing various alcohols, aldehydes, and amines to the corresponding carboxylates and nitriles at more favorable potentials compared to the oxygen evolution reaction. However, its detailed molecular-level mechanism is still in debate, especially for the potential-dependent behavior of some organic substrates. In this study, we revealed that the nickel oxyhydroxide can be dissected into two functional regions with a more facilely oxidized surface for facilitated substrate adsorption and a relatively inert bulk phase for accelerated electron transfer via probe-assisted kinetics and in situ surface-enhanced Raman spectroscopy. The prerequisite of the two regions conceals a universal potential-dependent oxidation behavior for almost all organic substrates. Further combining with the computational investigation unravels the origin of this potential dependence from the exothermic O/N-centered adsorption process on the surface and the rate-limiting proton-coupled electron-transfer (PCET) steps for the C–H bond breaking that demands bulk electron conductivity. This provides a rationale for designing more conductive underlayers to break the intrinsic limitations of nickel oxyhydroxide toward more efficient organic electrooxidation processes.
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FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Yuanyuan Wang,Maofeng Dong,Limin Guo,Yamin Zhu,Qingqing Jiang,Jianbo Xiao,Mingfu Wang,Yueliang Zhao
Harman and norharman were the most abundant β-carboline-type heterocyclic amines (HCAs) detected in various foodstuffs. Unsaturated fatty acids in foods may undergo rapid oxidative deterioration during transportation, storage and heat treatment, forming reactive carbonyl species (RCS). This work studied the effects of acrolein, a highly reactive RCS, on the formation of harman and norharman in the tryptophan model system. Results showed that 0.005, 0.01, 0.015, 0.02, 0.05, 0.1 and 0.2 mmol of acrolein led to harman production increased by 528 %, 752 %, 981 %, 1172 %, 1375 %, 1288 % and 768 % respectively, and led to norharman formation increased by 116 %, 129 %, 152 %, 169 %, and 197 %, 185 % and 157 %, respectively. Furthermore, acrolein addition reduced the residue of tryptophan (up to 63.19 %), but increased the level of the intermediates including formaldehyde (up to 352 %), acetaldehyde (up to 491 %), (1S,3S)-1-Methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (MTCA, up to 1936 %), and 1,2,3,4-tetrahydro-β-carboline-3-carboxylicacid (THCA, up to 2142 %) in the tryptophan model system. Acrolein might react with tryptophan, harman and norharman to eliminate them directly. These data suggested that acrolein may contribute to harman and norharman formation through participating in the above complex chemical reactions. In addition, the content of harman and norharman produced in roast beef patties made of minced beef oxidized for 2, 4, 6, 8, and 10 days increased by 118 %, 188 %, 267 %, 137 %, and 48 %, respectively, and led to norharman formation increased by 140 %, 132 %, 90 %, 86 %, and 74 %, respectively compared with those made of fresh minced beef, which further illustrated that lipid oxidation products potentially contributed to harman and norharman formation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yiyun Wang,Xinli Li,Zhi Chen,Kai Ma,Congming Tang
This work reported the coupling reaction of lactic acid (LA) to produce pyruvic acid (PyA) and propionic acid (PA) simultaneously over defect-rich MoS2 nanosheets. The process intensification linked to dehydrogenation of LA and hydrodeoxygenation of LA brings about the advantage that is not supplied additionally with oxygen and hydrogen, achieving a green and safe route. The defected structure is characterized by high-resolution transmission electron microscopy (HRTEM) and positron annihilation lifetime spectroscopy (PALS), which promotes the catalytic performance for the coupling reaction of LA. To fully understand the importance of the defected structure, the catalytic performance of defect-free MoS2 is also evaluated. It is found that the PyA/PA ratio is less than 1 and acetaldehyde selectivity is relatively high, suggesting that the produced hydrogen from the dehydrogenation of LA is insufficient for hydrodeoxygenation of LA over defect-free MoS2, and the difference of hydrogen comes from the side reactions of decarbonylation and decarboxylation of LA. Unlike the defect-free MoS2, the dehydrogenation of LA over the defect-rich MoS2 can provide sufficient hydrogen for hydrodeoxygenation of LA, so that the side reactions are drastically weakened. The widened interplanar spacing can fully expose the defect and the LA reactant molecule is more accessible to defective sites, which can endow a better catalytic activity. Surface hydrophilicity can improve adsorption and transfer, and better activity is observed over the defect-rich MoS2 and widened defect-rich MoS2. At 300 °C and a LA LHSV of 2.6 h–1 under an inert atmosphere, the catalyst offers a satisfactory total selectivity to pyruvic acid and propionic acid of about 85%, and the molar ratio of pyruvic acid/propionic acid is 1.1.
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Food Bioscience
·
2023
·
IF 5.2
Yanping Fan,Meilan Xue,Tianhu Shan,Yixian Bai,Huaqi Zhang,Man Liu,Peng Wang,Xi Liang,Hui Liang
Alcoholic liver fibrosis (ALF) is a reversible pathological change in the liver caused by chronic alcohol consumption and is associated with the activation of hepatic stellate cells . Recent findings suggest that niacin can lower triglyceride levels and exert potent antioxidant effects in liver damage. However, the therapeutic effects and molecular mechanisms of niacin in liver fibrosis remain unclear. Therefore, this study aimed to investigate the effects and mechanisms of niacin in ALF using in vivo and in vitro experiments. To establish a murine model of ALF, male C57BL/6N mice were fed a Lieber–DeCarli liquid diet containing 4 % (vol/vol) ethanol and injected with carbon tetrachloride twice weekly (2 mL/kg) for 8 weeks. L-02 and LX2 cells were treated with 400 μM acetaldehyde for 24 h to establish an in vitro ALF model. Serum parameters were examined to investigate the protective effects of niacin against ALF, and network pharmacology was used to identify potential targets and pathways of niacin. Niacin protects against ALF by suppressing the serum levels of aspartate aminotransferase, alanine aminotransferase, lactate dehydrogenase , and alkaline phosphatase . Additionally, niacin treatment ameliorated liver fibrosis by improving the antioxidant system, inhibiting heat shock protein 90 (HSP90) activation, promoting signal transducer and activator of transcription 3 (STAT3) ubiquitination , and suppressing the JAK1/STAT3 signaling pathway . Collectively, this study provides experimental evidence that niacin protects against ALF by downregulating the HSP90/JAK1/STAT3 signaling pathway.
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Nano Research
·
2023
·
IF 9.9
Su Zhen,Li Depeng,Zhang Lixin,Tian Si,Su Yuhong,Hu Xiaoyun,Xiong Duan,Guan Qingqing
Smart materials that integrate multi-stimuli response, full reversibility, and dual-visual read-out channel are highly desired for anti-counterfeiting and information encryption applications. Herein, we developed a multiresponsive perchlorate terpyridyl Pt(II) nano complex which could undergo fully reversible conversion between three forms stimulated by water or formaldehyde molecule due to the extent of Pt–Pt interaction. Meanwhile, a dual-visual channel, i.e., the colorimetric channel changed from yellow to orange or red and the corresponding luminescent channel from orange to orange-red or red, has also been found. The weak and equivalent strength of ion-dipole interaction and hydrogen bond that generated between formaldehyde/water and Pt(II) salt result in the easy-control reversibility between the three forms. Furthermore, by introducing different polymer matrices, 1 Cl·ClO 4 @PMMA ( 1 Cl·ClO 4 : [Pt(tpy)Cl]·ClO 4 , tpy: 2,2′:6′,2″-terpyridine), PMMA: poly(methyl methacrylate)) and 1 Cl·ClO 4 @PVA (PVA: polyvinyl alcohol) are successfully constructed, which exhibit different reversible behaviors since the PMMA and PVA matrix exert different influences on the strength of hydrogen-bond. Those smart Pt(II) salt nanostructures present great potential for high-security-level anticounterfeiting application.
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NATURE
·
2023
·Vol. 621
·期 7979
·511-515
·
IF 64.8
Yang Guangxu,Gong Zhenggang,Luo Xiaolin,Chen Lihui,Shuai Li
Plywood is widely used in construction, such as for flooring and interior walls, as well as in the manufacture of household items such as furniture and cabinets. Such items are made of wood veneers that are bonded together with adhesives such as urea–formaldehyde and phenol–formaldehyde resins 1 , 2 . Researchers in academia and industry have long aimed to synthesize lignin–phenol–formaldehyde resin adhesives using biomass-derived lignin, a phenolic polymer that can be used to substitute the petroleum-derived phenol 3 , 4 , 5 , 6 . However, lignin–phenol–formaldehyde resin adhesives are less attractive to plywood manufacturers than urea–formaldehyde and phenol–formaldehyde resins owing to their appearance and cost. Here we report a simple and practical strategy for preparing lignin-based wood adhesives from lignocellulosic biomass. Our strategy involves separation of uncondensed or slightly condensed lignins from biomass followed by direct application of a suspension of the lignin and water as an adhesive on wood veneers. Plywood products with superior performances could be prepared with such lignin adhesives at a wide range of hot-pressing temperatures, enabling the use of these adhesives as promising alternatives to traditional wood adhesives in different market segments. Mechanistic studies indicate that the adhesion mechanism of such lignin adhesives may involve softening of lignin by water, filling of vessels with softened lignin and crosslinking of lignins in adhesives with those in the cell wall.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Linghui Kong,Xinyi Fan,Limin Guo,Qingqing Jiang,Jianbo Xiao,Daming Fan,Mingfu Wang,Yueliang Zhao
In this study, we investigated the inhibitory effects of three soybean isoflavones and two soybean phytosterols on the formation of 3-chloropropane-1,2-diol fatty acid esters (3-MCPDE) and aldehydes in heated soybean oil model. 0.4 mM of genistin, genistein, daidzein, stigmasterol, and β-sitosterol significantly reduced 3-MCPDE formation by 25.7, 51.4, 21.4, 61.6, and 55.7%, and total aldehydes formation by 42.03, 43.94, 28.36, 54.74, and 39.23%, respectively. Further study showed that stigmasterol reduced the content of glycidyl esters (GEs) and glycidol, two key intermediates of 3-MCPDE, and prevented fatty acids degradation in the oils. Moreover, the effects of continuous frying time on the content of stigmasterol and the migration of stigmasterol were evaluated in the fried dough sticks model system. The content of stigmasterol in soybean oil was found to be significantly decreased with prolonged heating time. The concentrations of stigmasterol in fried dough sticks and the migration rates of stigmasterol from soybean oil to fried dough sticks decreased with repeated frying sessions. In addition, stigmasterol undergoes oxidative changes during heat treatment, and the oxidation products including 5,6α-epoxystigmasterol, 5,6β-epoxystigmasterol, 7α-hydroxystigmasterol, 7β-hydroxystigmasterol, stigmasterlol-3β,5α,6β-triol, and 7-ketostigmasterol were identified in the frying oils but not in the fried dough sticks. Overall, stigmasterol could be added to soybean oil to reduce 3-MCPDE and aldehydes formation, and reacting with GEs/glycidol and protection of lipid acids from oxidation may be the mechanism of action of stigmasterol.
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危险品化学品经营许可证（带存储）