Catalysts
·
2023
·Vol. 13
·期 9
·1248
·
IF 3.9
Yanni Liu,Yonghui Chen,Yikai Wang,Zijie Xiao,Yilin Chen,Jianchun Jiang,Xiaoping Rao,Yun Zheng
The generation of p-cymene from the catalytic dehydrogenation of dipentene is one of the most vital approaches for the synthesis of p-cymene in the chemical industry. Herein, CTF polymer was synthesized by an ionothermal method via using terephthalonitrile as monomer and NaCl-KCl-ZnCl2ternary mixture as catalyst and solvent, and Pd/CTF catalyst was prepared by loading CTF matrix with Pd nanoparticles via a chemical reduction method. The as-obtained Pd/CTF catalyst with the loading amount of 5 wt% Pd showed remarkable catalytic activity in the dehydrogenation of dipentene to p-cymene with a high conversion rate of 100% and a high selectivity of 96% at the reaction temperature of 220 °C in a stainless-steel autoclave containing 0.1 MPa of Ar gas, and also exhibited good stability in the recycling tests. The strong interaction between Pd nanoparticles and CTF and the enhanced electron transfer at the metal-semiconductor interface contribute to the outstanding catalytic performance of Pd/CTF for the dehydrogenation of dipentene to p-cymene. This work demonstrates that the metal-semiconductor catalysts possessed excellent potential in the production of high-value-added chemical products from terpenes conversion.Keywords:palladium nanoparticles;covalent triazine frameworks;catalysis;dehydrogenation;dipentene
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hongji Li,Rui Wang,Miao Zheng,Mingyun He,Xiaorong Liu,Kaili Wang,Youming Dong,Yanjun Li,Jianzhang Li
Soy protein-based adhesives present a promising alternative to petroleum-based adhesives in the wood industry. Nevertheless, their limitations, including insufficient water resistance, low bonding strength, and inadequate mold resistance, constrain their industrial applications. Plant fiber-reinforced composites find extensive applications across various sectors, including furniture, automotive, and aerospace. However, the smooth surfaces of the fibers adversely impact the reinforcement effect. Inspired by the multilayered microscale structure of peacock mantis shrimp chelipeds, this work presents an eco-friendly method to develop hierarchical functionalized kenaf fibers (KF) for reinforcing soybean meal (SM) adhesive. Specifically, ZnO was deposited onto the KF surface to impart micro-nano roughness, thereby enhancing their mechanical interlocking effect with the SM matrix. Bio-based lipoic acid (LA) and limonene (LIM) were employed to create a highly reactive layer on the fiber surface, facilitating the formation of multiple chemical crosslinking structures with the SM matrix. The synergistic mechanical and chemical effects between KF and SM endowed adhesive with improved performance. The wet shear strength of the three-layer plywood prepared with the synthetic adhesive was remarkably increased by 450 % to 1.21 MPa. Additionally, the combined anti-mold effects of ZnO, LA, LIM, and triglyceride amine (TGA) extend the adhesive's storage time to 7 days. This sustainable and eco-friendly design of multilayered bionically functionalized KF offers an efficient approach for the high-value utilization of agroforestry residues, presenting broad application prospects in SM-based adhesives.
研究领域:
材料科学
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生物仿生学
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产品关联
DOI
PubMed
高影响因子
FITOTERAPIA
·
2025
·
IF 2.6
Li Zhang,Hui Wu,Xiaoyuan Li,Xiu Zhang,Hua Li,Huaqiao Tang,Daxuan Tang,Shijing Du,Ya’’ou Liu,Yangfan Tang,Xiaoming Bao,Guoqiang Cheng
Qianghuo (the rhizomes and radixes of Notopterygium incisum Ting ex H.T. chang) is a traditional Chinese medicine, and widely used as an anti-inflammatory, anodyne, antifebrile agent. Qianghuo volatile oil also exhibits the same properties, and the effects are probably related to the inhibition of cyclooxygenase (COX), but its bioactive components are not clear yet. To figure out the bioactive components of Qianghuo volatile oil target to cyclooxygenase-2 (COX-2), a ligand fishing method using immobilized COX-2 magnetic beads (COX-2-MB S ) and gas chromatography–mass spectrometry (GC–MS) were developed to identify the compounds that act on COX-2. Nine ligands, including 3-carene, β-caryophyllene, eucalyptol, α-terpinene, Limonene, δ-terpinene, α-pinene, β-pinene and γ-terpinene, were specifically captured by COX-2-MB S . Among them, 3-carene, β-caryophyllene, and eucalyptol in Qianghuo volatile oil were isolated and confirmed by in vitro inhibition and in vivo anti-inflammatory activity assays as selective inhibitor against COX-2. The IC 50 values were 13.5, 10.1, and 7.6 μM, respectively. Compared with the model, 3-carene, β-caryophyllene, and eucalyptol considerably reduced ear swelling and paw edema. Moreover, 3-carene and eucalyptol significantly decreased the changes of COX-2 expression in RAW264.7 cells activated by LPS. Our study validated that the developed ligand-fishing method using COX-2-MBs coupled with GC–MS can be applied to recognize COX-2 inhibitors in Qianghuo volatile oil. In vitro/vivo assay showed 3-carene and eucalyptol in Qianghuo volatile oil had strong inhibition against COX-2. This study may provide novel methods for discovering active components for volatile oil–based drug development or aromatherapy.
研究领域:
中药学
·
生物化学
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药理学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2012
·
IF 3.655
Jiao Jiao,Yu-Jie Fu,Yuan-Gang Zu,Meng Luo,Wei Wang,Lin Zhang,Ji Li
An efficient enzyme-assisted microwave hydro-distillation (EAMHD) essential oil from Fructus forsythiae was investigated in the present study. Under optimal process conditions, the maximum extraction yield of the essential oil reached 3.27%, which increased by 39.15% and 45.33% more than those of normal microwave hydro-distillation (MHD) and traditional hydro-distillation (HD), respectively. GC/MS analysis revealed the presence of 21 compounds in Fructus forsythiae essential oil. Higher amounts of oxygenated monoterpenes were existed in the essential oil of EAMHD (26.47%) in comparison with MHD (22.37%) and HD (16.79%). Meanwhile, the antimicrobial and antioxidant activities were also assessed in vitro , EAMHD extracted essential oil exhibited relatively good antimicrobial activity with the minimum inhibitory concentration (MIC) values for all the susceptible microorganisms ranging from 0.78 to 6.25 mg/ml, and showed considerable linoleic acid oxidation inhibition (63.56%) in the β-carotene–linoleic acid bleaching assay. Furthermore, samples scanning electron micrographs illustrated the severely structural disruption of EAMHD.
研究领域:
药理学
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分析化学
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微生物学
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产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2020
·Vol. 12
·期 6
·2267-2275
·
IF 2.602
Zhang Dongqiang,Chen Xiangyun,Yuan Bing,Yu Fengli,Xie Congxia,Yu Shitao
Hydration of α-pinene catalyzed by a natural deep eutectic solvent (NADES) prepared by oxalic acid dihydrate (OA·2H 2 O) and betaine (Bet), 2.7OA·2H 2 O/Bet, has been studied to develop a more economical and green process for one-step hydration method. It has been found that a homogeneous ternary DES system could be established with OA·2H 2 O and Bet in a simple, convenient, and atomic economy way. Fourier transform infrared spectrum (FT-IR), proton nuclear magnetic resonance ( 1 H NMR), thermogravimetry (TG), and differential scanning calorimetry (DSC) have been applied to confirm the formation of hydrogen bonding between OA, H 2 O, and Bet. With the consideration of catalytic activity, selectivity, and ability to recycle, 2.7OA·2H 2 O/Bet has been screened out to be a promising catalyst for hydration of α-pinene due to its appropriate acidic properties and solubility. In this catalytic system of hydration, water, as one of the reactants, both assisted in the formation of DES and acted as the dispersing agent. Correspondingly, an “emulsifying reaction at the reaction temperature and solid-liquid separation below room temperature” characteristic of this specific catalytic hydration of α-pinene has been achieved.
研究领域:
化学工程
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催化
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绿色化学
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有机合成
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2021
·
IF 4.952
Zefu Wang,Zhifei He,Dong Zhang,Xiaosi Chen,Hongjun Li
This study aimed to assess the protective effects of the main components of Zanthoxylum bungeanum Maxim. essential oil (ZBMEO) on the characteristics of rabbit meat myofibrillar protein (MP) under MDA (malondialdehyde) induced oxidation. The MP suspensions were mixed with various concentrations (5 mM, 25 mM and 50 mM) of linalool, limonene, sabinene under MDA-induced oxidation. The retained MDA contents were determined, and the thermal stability and structure of rabbit meat myofibrillar protein were analyzed. Linalool, limonene and sabinene can prevent MDA from binding to MP effectively. The addition of linalool, limonene and sabinene led to the increase in the sulfhydryl and free amine contents, and the decrease in the carbonyl content and surface hydrophobicity compared to control MP. Also, the addition had protective effects on maintaining the secondary structure and morphology of MP under MDA-induced oxidation. The Differential scanning calorimetry (DSC) and SDS-PAGE analysis indicated that linalool, limonene, sabinene had an obvious protective effect on MHC and actin. The above results suggest that linalool, limonene and sabinene could reduce the oxidative damage of MDA to MP, which might have the potential in protecting the structure and physicochemical properties of the protein in foods .
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 8
·1577
·
IF 3.06
Ze-Hua Li,Ming Cai,Yuan-Shuai Liu,Pei-Long Sun,Shao-Lei Luo
In this work, antibacterial activity of finger citron essential oil (FCEO,Citrus medica L. var. sarcodactylis) and its mechanism against food-borne bacteria were evaluated. A total of 28 components in the oil were identified by gas chromatography-mass spectrometry, in which limonene (45.36%), γ-terpinene (21.23%), and dodecanoic acid (7.52%) were three main components. For in vitro antibacterial tests, FCEO exhibited moderately antibacterial activity against common food-borne bacteria:Escherichia coli,Staphylococcus aureus,Bacillus subtilisandMicrococcus luteus. It showed a better bactericidal effect on Gram-positive bacteria than Gram-negative. Mechanisms of the antibacterial action were investigated by observing changes of bacteria morphology according to scanning electron microscopy, time-kill analysis, and permeability of cell and membrane integrity. Morphology of tested bacteria was changed and damaged more seriously with increased concentration and exposure time of FCEO. FCEO showed a significant reduction effect on the growth rate of surviving bacteria and lead to lysis of the cell wall, intracellular ingredient leakage, and consequently, cell death.Keywords:finger citron;essential oil;antibacterial;mechanism
研究领域:
食品科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ESSENTIAL OIL RESEARCH
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2013
·
IF 0.553
Xiao-Wei Huang,Yun-Chao Feng,Yi Huang,Hai-Ling Li
Litsea cubeba essential oil (LCEO) is widely used as a flavor enhancer in cosmetics and as a folk skin-care agent in southern China. The objective of this paper is to investigate whether LCEO has biological activities that might be useful in modern skin-protection formulations. The present study results revealed that citral (57.4%) was a major component, while LCEO exhibited a potent inhibitory effect on tyrosinase (IC50 values 100 μg/mL), good antioxidative activities (IC50: 17.75 mg/mL for ABTS+., 10.2 mg/mL for O2
−), and apparent protective effect against UV–TiO2–NO2
−-induced protein oxidation at 0.01 mg/mL and tyrosine nitration at 0.1 mg/mL. Additionally, the biological activities of LCEO were compared with that of its main constituents. The results demonstrated that any individual major component was not the unique contributor to the high activity of LCEO. Based on these results, we suggested that LCEO could serve as a new natural skin-whitening agent.
研究领域:
化妆品科学
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植物化学
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皮肤生物学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Yangyang Zhu,Fei Gao,Jiang Zhong,Liang Shen,Yangju Lin
The utilization of bio-based precursors to prepare materials is highly desirable for the consideration of sustainable energy and materials. Vitrimers have received considerable attention because of their high mechanical performance that is comparable to conventional thermosets and advantageous reprocessability that allows to be recycled. However, most vitrimers are prepared from petroleum-based raw materials, and only a few examples employ bio-based raw materials, of which most utilize transesterification dynamic chemistry that often requires external catalyst that may leach or decompose during reprocessing. Herein, we report a catalyst-free vinylogous urethane vitrimer derived from renewable castor oil and DL-limonene. Prepared vitrimer shows excellent reprocessability and shape memory properties. We also envisaged that the strategy of preparing bio-based vitrimers reported here can be generalized to other bio-based raw materials that are rich in double bonds.
研究领域:
材料科学
·
可持续化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2016
·
IF 3.652
Huidong Zheng,Jinliang Chen,Chao Li,Jingjing Chen,Yingshu Wang,Suying Zhao,Yanru Zeng
Myrcene, an important intermediate for the production of fine chemicals and pharmaceuticals, is mainly produced by the pyrolysis of β-pinene in the industry. The study of the direct pyrolysis of β-pinene was carried out without a catalyst and carrier gas at 573–873 K and under low pressure. In order to clarify the reaction mechanism, the primary intermediates of β-pinene pyrolysis including myrcene and limonene were also used as raw materials for further pyrolysis. The identification of some small molecules and C 10 H 16 isomers in the products proves that both decomposition reaction and ene reaction take place during the pyrolysis process. Based on the qualitative and quantitative analysis of reaction products, a reaction scheme for the pyrolysis of β-pinene was proposed. With appropriate simplification of the reaction scheme, a phenomenological kinetic model of the competitive parallel and consecutive first-order reaction was built, and exhibited good agreement with the experimental data. The activation energy ( E a ) and pre-exponential factor ( k 0 ) for each pathway were also determined.
研究领域:
化学工程
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
PEST MANAGEMENT SCIENCE
·
2018
·Vol. 75
·期 4
·986-997
·
IF 3.249
Lulu Dai,Haiming Gao,Jiaqi Ye,Danyang Fu,Yaya Sun,Hui Chen
BACKGROUND Bark beetles rely on detoxifying enzymes to resist the defensive terpenoids of their host trees. Research on carboxylesterases (CarEs) has focused on their multiple functions in the metabolic detoxification of pesticides and plant allelochemicals, drug resistance, and juvenile hormone and pheromone degradation. RESULT We identified eight new CarE genes in the Chinese white pine beetle ( Dendroctonus armandi ) and carried out bioinformatics analysis on the deduced full-length amino acid sequences. Differential transcript levels of CarE genes were observed between sexes; within these levels, significant differences were found among the different development stages, and between insects fed on the phloem of Pinus armandi and exposed to five stimuli [(−)-α-pinene, (−)-β-pinene, (+)-3-carene, limonene and turpentine] at 8 and 24 h. CONCLUSION Transcription levels of CarE genes suggest some relationship with the detoxification of terpenoids released by host trees. The functions of bark beetle esterase are mainly in hydrolyzing the host chemical defense and degrading odorant molecules during host selection and colonization. © 2018 Society of Chemical Industry
研究领域:
昆虫学
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分子生物学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ASIA-PACIFIC ENTOMOLOGY
·
2016
·
IF 0.824
Lu Liu,Qiong Zhou
Citrus fruit fly Bactrocera minax (Enderlein) (Diptera:Tephritidae) is a devastating pest of citrus plants in China. In order to characterize the behavioral mechanisms and possible chemical cues involved in host selection by female citrus fruit fly, the host plant volatiles was analyzed and Y-tube olfactometer assays were used. Host odor from citrus fruits peels elicited upwind orientation flights followed by landing and egg-laying, demonstrating the essential role of host plant volatiles in B. minax host-finding and oviposition behavior. GC–MS analysis of volatiles from the peels of three varieties citrus fruits, that were Bingtang sweet oranges ( Citrus sinensis cv. Bingtang), Satsumas mandarins ( Citrus reticulata cv. Satsuma) and Sour oranges ( Citrus aurantium ), which adult and larval of B. minax preferred to, showed that the major compounds extracted from the basal region were different from those of the distal region to some extent. Furthermore, in Y-tube olfactometer attraction assays, female flies were significantly attracted ( P < 0.05) to four out of the thirteen tested compounds from the citrus volatiles, including nonanal , citral , limonene and linalool . Conversely, furfuryl alcohol and guaiastil significantly repelled females ( P < 0.05). The percentage composition of nonanal, citral, limonene and linalool from different regions of the fruits displayed a positive correlation with the numbers of egg marks made by females, whereas furfuryl alcohol and guaiastil displayed a correspondingly negative correlation. These results suggest that the oviposition preference of B. minax females is highly related to the chemical compounds emitted from host fruit peels.
研究领域:
昆虫学
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植物化学
·
化学生态学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）