NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 38
·18070-18081
·
IF 3.591
Xiaolong Liu,Jingye Ma,Hong Yuan
A series of mesoporous Pt@SAPO-11 catalysts with different Pt loadings were prepared using an in situ encapsulation process. These materials exhibited good topological structures and high Brunauer–Emmett–Teller (BET) surface areas (132–166 m2 g−1). Transmission electron microscopy images showed that the Pt nanoparticles in this material were in the 5–8 nm size range and were highly dispersed on the inner surfaces of the SAPO-11 support. N2-BET analyses demonstrated that the samples had mesoporous structures with average pore sizes of 7.3–8.5 nm. Characterization of the 1.0 wt% Pt@SAPO-11 catalyst by X-ray photoelectron spectroscopy and H2-temperature programmed reduction indicated strong interactions between the Pt nanoparticles and the carrier. This material was used to promote oleic acid decarboxylation under CO2 and gave a C8–C17 alkane yield of 80.8% after 4 h at 340 °C. After five repeated uses, the catalyst still gave a yield of 77.6%.
研究领域:
催化化学
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材料科学
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高影响因子
Engineering
·
2025
·
IF 11.6
Zhonghui Liu,Yi Zhang,Tieliang Liu,Qi Zhou,Yandaizi Zhou,Kheng-Lim Goh,Siew-Young Quek,Fenghong Huang,Mingming Zheng
Algae oil contains polyunsaturated fatty acids (PUFAs) that are beneficial to human health and development. Enzymatic refining is a sustainable approach that can improve the quality and nutritional value of algae oil. However, this approach involves the use of specific enzymes to remove unwanted impurities such as phospholipids (PLs) and free fatty acids (FFAs). This study proposes a novel immobilized phospholipase, immobilized phospholipase A1 (PLA1@MCM-41-C 8 ), which serves a dual purpose: it is effective for both degumming arachidonic acid (ARA)-enriched algal oil and its subsequent deacidification. The use of PLA1@MCM-41-C 8 achieved a degumming rate of 95.9% for crude algal oil, with an ARA retention rate of up to 97.3%. The acidity of the degummed oil decreased from 14.5 to 1.1 mg KOH∙g −1 , while simultaneously producing 29.2% high-value diacylglycerol (DAG). By comparing enzymatically degummed and deacidified ARA-enriched algae oil (EDDO) with crude ARA-enriched algae oil (CO), commercialized refining algae oil (CRO), it was found that enzymatic refining had minimal impact on antioxidant stability, fatty acid composition, and oil content. In particular, the flavor characteristics of algal oil before and after enzymatic refining with PLA1@MCM-41-C 8 remained unchanged and were dominated by the main volatile compounds: alcohols and aldehydes. Compared with free phospholipase A1 (PLA1), PLA1@MCM-41-C 8 exhibited significantly improved thermostability, pH tolerance, solvent tolerance, and long-term reusability. These characteristics make it a promising candidate for complex oil refining in industrial applications.
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高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Xiaodong Xu,Rui Xu,Qian Jia,Tao Feng,Qingrong Huang,Chi-Tang Ho,Shiqing Song
The volatile compounds of Volvariella volvacea mushroom were investigated by solvent assisted flavor evaporation (SAFE)/gas chromatography-mass spectrometry (GC–MS), gas chromatography-olfactometry (GC-O), odor activity value (OAV), combined with aroma reconstitution and omission. The results showed that a total of 63 compounds were detected after SAFE extraction. A total of 26 compounds were determined after GC-O and 17 compounds whose OAV greater than 1 were subjected to reconstitution and omission experiments. The results showed that dihydro-β-ionone, 1-octen-3-one, 1-octen-3-ol, γ-undecalactone, 3-octanol, 2-octanone, hexanal, 2-methylbutanal, camphene, carvone, 2-nonanone, and phenylacetaldehyde have been successfully identified as the key aroma compounds. More significantly, dihydro-β-ionone as a key aroma compound was first found in Volvariella volvacea mushroom.
研究领域:
食品科学
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微生物学
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DOI
PubMed
高影响因子
JOURNAL OF PEPTIDE SCIENCE
·
2023
·Vol. 29
·期 11
·e3497
·
IF 2.1
Ruifang Li,Pu Hao,Kedong Yin,Qingpeng Xu,Shiming Ren,Yingyuan Zhao,Lan Zhang,Beibei Zhang
Antimicrobial peptides and their analogues have become substitutes for antibiotics in recent years. The antimicrobial peptide analogue SAMP-A4-C8 ( n -octanoic-VRLLRRRI) with high antimicrobial activity was found in our lab. We speculate that it may kill pathogens by some lethal mechanism of action. In the present investigation, the microbicidal activities of SAMP-A4-C8 and its mechanism of action were investigated. The results demonstrated that SAMP-A4-C8 had lethal activities against Staphylococcus aureus and Candida albicans by cell disruption. Based on its microbicidal activities, we believe that it is worth further research for its potential as drug candidate. The results showed that SAMP-A4-C8, with low propensity to induce the resistance of S. aureus and C. albicans , could kill the persister cells of S. aureus and C. albicans , exhibited biofilm forming inhibition activity and preformed biofilm eradication ability against S. aureus and C. albicans , and displayed therapeutic potential on pneumonia in S. aureus -infected mice by reducing lung inflammation. The present study provided a promising drug candidate in the war against multidrug resistance.
研究领域:
微生物学
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药理学
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感染病学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shitong Yu,Leilei Bie,Zhicheng Luo
Lignin is mainly composed of three basic C9 phenolic monomers, which makes it a formidable challenge to selectively produce C8 phenolic monomers, precursors for the ethylbenzene and styrene, due to intricate C–O and C–C cleavages. Here, we introduce a Ni 0.5% /AlN catalyst, featuring atomically dispersed Ni on a basic AlN support. The catalyst yields 52.7 % relative phenolic monomers with an unparalleled selectivity of 58.7 % for C8 phenolic species (Phenol, 4-ethyl, and Phenol, 4-ethyl-2-methoxy). The inherent basic sites within the AlN support crucially facilitate the formation of quinone intermediates, subsequently directed by single-atom Ni into C8 phenolic monomers. The catalyst showcases robust recyclability over five cycles, because of the strong interactions between Ni and AlN support. This study reveals a synergistic interplay between single-atom Ni and the basic support, paving a transformative pathway for the selective valorization of lignin.
研究领域:
化学工程
·
催化
·
可再生能源
·
绿色化学
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DOI
高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 17
·4157-4168
·
IF 9.125
Shiyou Xing,Pengmei Lv,Haoran Yuan,Lingmei Yang,Zhongming Wang,Zhenhong Yuan,Yong Chen
A new vision of using carbon dioxide (CO2) catalytic processing of oleic acid into C8–C15 alkanes over a nano-nickel/zeolite catalyst is reported in this paper. The inherent and essential reasons which make this achievable are clearly resolved by using totally new catalytic reaction pathways of oleic acid transformation in a CO2 atmosphere. The yield of C8–C15 ingredients reaches 73.10 mol% in a CO2 atmosphere, which is much higher than the 49.67 mol% yield obtained in a hydrogen (H2) atmosphere. In the absence of an external H2 source, products which are similar to aviation fuel are generated where aromatization of propene (C3H6) oxidative dehydrogenation (ODH) involving CO2 and propane (C3H8) and hydrogen transfer reactions are found to account for hydrogen liberation in oleic acid and achieve its re-arrangement in the final alkane products. The reaction pathway in the CO2 atmosphere is significantly different from that in the H2 atmosphere, as shown by the presence of 8-heptadecene, γ-stearolactone, and 3-heptadecene as reaction intermediates, as well as a CO formation pathway. Because of the highly dispersed Ni metal center on the zeolite support, H2 spillover is observed in the H2 atmosphere, which inhibits the production of short-chain alkanes and reveals the inherent disadvantage of using H2. The CO2 processing of oleic acid described in this paper will significantly contribute to future CO2 utilization chemistry and provide an economical and promising approach for the production of sustainable alkane products which are similar to aviation fuel.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chen Yuqing,Wu Xuan,Yan Taihong,Wang Wentao,Liu Junjie,Wang Hui
NTAamide(C8) exhibits high selectivity for the extraction of Pu(IV) across a wide range of nitric acid concentrations. To separate trace Pu(IV) from radioactive liquid stream generated during the PUREX process in spent nuclear fuel reprocessing, a novel silica-polymer-based adsorbent, NTAamide(C8)/SiO 2 -P, was synthesized via vacuum impregnation using NTAamide(C8) as the extractant and SiO 2 -P as the support. The adsorption performance of Pu(IV) were systematically evaluated. Batch experiments revealed that adsorption equilibrium was achieved within 2 h, with a maximum adsorption capacity of 143.2 mg/g for Pu(IV). The material demonstrated high selectivity for Pu(IV) and exhibited excellent radiation resistance and hydrolytic stability. The adsorption mechanisms were further elucidated using X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, confirming the formation of 1:1 complexes between NTAamide(C8) and the metal ions. Column experiments using actual uranium product solution from the PUREX process verified the material's performance in trace Pu(IV) removal. After column treatment, the Pu content in the uranium product solution was reduced to below 10 Bq/gU, with no significant loss of uranium. These results demonstrate that NTAamide(C8)/SiO 2 -P is a promising adsorbent for the efficient and selective separation of Pu(IV) from radioactive liquid stream under a wide range of nitric acid concentrations.
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高影响因子
Foods
·
2024
·Vol. 13
·期 16
·2539
·
IF 4.7
Zhonghui Liu,Tieliang Liu,Run Liu,Qi Zhou,Yandaizi Zhou,Yi Zhang,Mingming Zheng
Rapeseed oil is a widely consumed edible oil that contains varieties of beneficial micronutrients such as tocopherols and phytosterols; however, the high acid value due to increased free fatty acid can imperil the oil quality and safety. This paper proposed the enzymatic deacidification for high-acid rapeseed oil and simultaneous production of functional diacylglycerols (DAGs) catalyzed by self-made immobilized lipase CALB@MCM-41-C8. The results indicate that the carrier of molecular sieve MCM-41 exhibited a sufficient surface area of 1439.9 m2/g and a proper pore size of 3.5 nm, promoting the immobilization of lipase CLAB. Under the optimal reaction conditions, the acid value of rapeseed oil was largely decreased from 15.3 mg KOH/g to 1.7 mg KOH/g within 3 h, while DAG content was increased from 1.2% to 40.2%. The antioxidant stability of rapeseed oil was also increased from 4.3 h to 7.6 h after enzymatic deacidification. Besides, the deacidified rapeseed oil exhibited fatty, bitter almond aromas, compared to the picked-vegetable, spicy, and pungent aromas for high-acid oil. Finally, the catalytic stability and applicability of CALB@MCM-41-C8was validated, thus demonstrating the great potential of CALB@MCM-41-C8in green refining of edible oils and sustainable synthesis of functional lipids.
研究领域:
食品科学
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生物技术
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化学工程
·
农业化学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 8
·2055-2067
·
IF 3.709
Xiaolong Liu,Jingye Ma,Minxin Wang,Hong Yuan
BACKGROUND A series of mesoporous Pt@KIT−6/SAPO−11 catalysts with SiO 2 :Al 2 O 3 molar ratios of 0.3, 0.4, or 0.5 and Pt loadings of 0.4, 0.8, or 1.2 wt% were prepared via an in situ encapsulation process using a PEO − PPO − PEO triblock copolymer (EO 20 PO 70 EO 20 , P123) as the mes. China 750001 oporous template and KIT−6 molecular sieves as the silicon source. RESULTS These catalysts were characterized by transmission electron microscopy (TEM), specific surface area analysis, and pyridine–infrared spectroscopy (Py − IR). The results showed that Pt nanoparticles with particle sizes of 3–7 nm were uniformly dispersed on the supports. These materials also exhibited good mesoporous structures with specific surface areas of 138–197 m 2 /g and average pore sizes of 7.1–9.9 nm. The specimens having a SiO 2 :Al 2 O 3 molar ratio of 0.4 also showed an orderly strip−shaped pore structure. The Py − IR results indicated that the catalysts had both Brønsted acid and Lewis acid sites, with total acid contents in the range of 77.8–131.1 μmol/g. CONCLUSION The decarboxylation of oleic acid using these materials under CO 2 was examined. The catalyst with a SiO 2 :Al 2 O 3 molar ratio of 0.4 and a Pt loading of 0.8 exhibited the best catalytic performance and a C8 − C17 alkanes yield as high as 85.1% at 340 °C by using a catalyst−to−oil mass ratio of 1:10 and a reaction time of 5 h. This performance was attributed to the ordered mesoporous structure of this catalyst along with its high surface area (173 m 2 /g), good crystallinity (92.8%), suitable acid content (98.6 μmol/g), and abundant Pt metal active sites. © 2022 Society of Chemical Industry (SCI).
研究领域:
催化化学
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材料科学
·
能源化学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Lin Cheng,Xitong Sun,Qian Li,Jia Yang,Ruihao Wang,Xiyan Sun,Li Wei
High adsorption and desorption efficiencies for both anionic and cationic dyes are still a challenge for adsorbents to treat dyestuffs wastewater. In this study, the C8/threonine-functionalized mesoporous silica aerogel based on mixed-mode was constructed to overcome the challenge, with properties of hydrophobicity and switchable surface charge of n-octyl and threonine groups. With methylene blue and azophloxine as cationic and anionic dye models, batch tests were conducted. The consequences proofed the adsorption process was efficient and fast, and the highest adsorption quantities for methylene blue and azophloxine were estimated as 274.30 mg/g and 152.43 mg/g, respectively. Additionally, the adsorbent showed good removal efficiency and reusability. The desorption efficiencies exceeded 97% using low concentration HCl or NaOH as eluents. Mechanism investigation proved that adsorption process relied on hydrophobicity and electrostatic interactions . These results instructed that SG-C8/Thr was a promising adsorbent with excellent adsorption and desorption efficiencies for both anionic and cationic dyes.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xianjie Wang,Yaning Zhao,Hengsheng Wei,Yi Wang,Jingdong Gou,Jinhui He,Xue Ma,Louwei Cui,Liuyi Pan,Jiaojiao Liu,Dong Li
The separation of coal-derived C8 cyclohexane isomers, particularly cis-1,3-dimethylcyclohexane (cis-1,3-DMCH) and ethylcyclohexane (ECH), remains challenging due to their similar molecular structures and physicochemical properties, while research on cycloalkane isomer separation is limited. A series of functionalized UiO-66 derivatives (UiO-66, UiO-66-(CH 3 ) 2 , UiO-66-OH, and UiO-66-NO 2 ) were synthesized via solvothermal methods and systematically evaluated for their adsorption and separation performance toward C8 cyclohexane isomers through single-component and competitive batch adsorption experiments, dynamic breakthrough tests, and molecular simulations. Among the investigated materials, UiO-66-NO 2 demonstrated superior selectivity (α = 5.10) for cis-1,3-DMCH over ECH, with excellent regeneration stability over multiple cycles, significantly outperforming commercial activated carbons and zeolites. Mechanistic studies revealed that the enhanced selectivity arises from a dual mechanism combining geometric confinement effects and electronic recognition, where the oblate geometry and larger dipole moment of cis-1,3-DMCH enable preferential adsorption through strengthened C-H···O and C-H···NO 2 interactions, as confirmed by calculated binding energies (−37.15 kJ/mol for cis-1,3-DMCH vs. -22.13 kJ/mol for ECH) and diffusion coefficients. This work demonstrates rational MOF functionalization for efficient cycloalkane isomer separation, providing a promising strategy for coal-derived naphtha valorization.
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高影响因子
BIOORGANIC CHEMISTRY
·
2022
·
IF 5.307
Junjie Wu,Mengmeng Zhang,Lulu Song,Yahong Tan,Yosuke Taniguchi,Christopher John Hipolito,Youming Zhang,Yizhen Yin
Oxidative lesions, such as 8-oxo-dG and 8-oxo-dA, are continuously generated from exposure to reactive oxygen species. While 8-oxo-dG has been extensively studied, 8-oxo-dA has not received as much attention until recently. Herein, we report the synthesis of duplex DNAs incorporating dA, 8-oxo-dA, 7-deaza-dA, 8-Br-dA, and 8-Br-7-deaza-dA, which have different substitutions at 7- and 8-position, for the investigation into the implications of N7-hydrogen and C8-keto on the base pairing preference, mutagenic potential and repair of 8-oxo-dA. Base pairing study suggested that the polar N7-hydrogen and C8-keto of 8-oxo-dA, rather than the syn -preference, might be essential for 8-oxo-dA to form a stable base pair with dG. Insertion and extension studies using KF-exo − and human DNA polymerase β indicated that the efficient dGTP insertion opposite 8-oxo-dA and extension past 8-oxo-dA:dG are contingent upon not only the stable base pair with dG, but also the flexibility of the active site in polymerase. The N7-hydrogen in 8-oxo-dA or C7-hydrogen in 7-deaza-dA and 8-Br-7-deaza-dA was suggested to be important for the recognition by hOGG1, although the excision efficiencies of 7-deaza-dA and 8-Br-7-deaza-dA were much lower than 8-oxo-dA. This study provides an insight into the structure-function relationship of 8-oxo-dA by nucleotide analogues.
研究领域:
分子生物学
·
生物化学
·
遗传学
·
DNA修复
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PubMed
高影响因子
危险品化学品经营许可证（带存储）