Food Chemistry-X
·
2024
·
IF 6.5
Shaowei Li,Yuting Yuan,Liangxiao Zhang,Fei Ma,Peiwu Li
This study was based on QuEChERS cleanup coupled with UHPLC-MS/MS for the determination of γ-oryzanol compounds in vegetable oils. Several parameters of QuEChERS and UHPLC-MS/MS were studied for purification and detection of γ-oryzanol compounds in oil samples. Under the optimized conditions, the whole pretreatment procedure could be accomplished within 10 min without tedious procedure, larger volume of organic solvent and complicated apparatus. The limit of detections and the limit of quantifications for γ-oryzanol compounds were ranging from 0.1-0.3 µg kg −1 and 0.4–1.0 µg kg −1 , respectively. Satisfactory recoveries of all analyts were ranging from 72.2 % to 101.3 %, and the intra-day and inter-day precision were less than 10.6 %. The validation indicated that rice band oil and corn oil were rich in 24-mCAF, CAF, β-SIF, CMF and STF. The QuEChERS-UHPLC-MS/MS simultaneously quantified five γ-oryzanol compounds in lipid matrices and assessed the nutritional and functional substances of vegetable oils.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jianfeng Cheng,Ju Wang,Qiao Jiang,Jingli Xie,Shengfei Cao,Qi Zhang,Runqiu Gu
During the long-term deep geological disposal of high-level radioactive waste , buffer materials, such as bentonite , in the waste repositories are irradiated with gamma (γ) rays, affecting their structural stability. Furthermore, bentonite colloids are formed owing to the erosion of bentonite particles by groundwater. However, the effects of prolonged irradiation on the stability of bentonite colloids and their interaction with radionuclides , which can affect the migration of the radionuclides , are yet to be elucidated. Herein, we investigated the stability of colloid prepared from irradiated bentonite with varying doses of γ rays and conducted static adsorption batch experiments to examine their U(VI) adsorption behavior. The results showed that the stability of bentonite colloids was affected by their concentration, storage time, pH, and temperature. An investigation into their polymerization kinetics revealed that the critical coagulation concentration of bentonite colloids decreased with increasing irradiation dose, indicating that the colloids formed from unirradiated bentonite were stable. Furthermore, the U(VI) adsorption capacity of bentonite colloids decreased with increasing irradiation dose. This study provides new insights into the formation and stability of colloids of buffer materials after their irradiation and is expected to contribute significantly to the study of the migration behavior of nuclides by colloidal carriers.
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Catalysts
·
2024
·Vol. 14
·期 12
·885
·
IF 3.8
Yulin Sun,Yiwei Zhang,Baoqing Hou,Yong He,Wubin Weng,Yanqun Zhu,Zhihua Wang
Formaldehyde (HCHO) is known as one of the important indoor organic pollutants. How to remove and decompose the low concentration of formaldehyde at room temperature is important for indoor environments. Catalytic ozonation is an efficient method to thoroughly remove HCHO at room temperature, with high efficiency and few byproducts. A series of MnOx/γ-Al2O3catalysts were prepared in this work via the impregnation method and treated with different reagents (acid, alkali, and H2O2) to evaluate their catalytic activity for HCHO removal. The results showed that MnAl-II (acid treatment) performed well in activity tests, reaching a nearly 100% HCHO conversion at an O3/HCHO of 2.0 and attaining a CO2selectivity of above 95% at an O3/HCHO of 3.0 at 30 °C, with almost no ozone residual existing. The larger specific surface area, abundant oxygen vacancies, and higher number of acid sites contributed to the excellent performance of MnAl-II. Stability and H2O resistance tests of MnAl-II were also conducted. To reveal the intermediate product formation and further investigate the reaction mechanism of HCHO ozonation, in-situ DRIFTS measurement was carried out combined with DFT calculations.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yongyao Lu,Yanlin Hou,Shutian Liu,Shugang Jia,Yanmei Zhu,Xuehong Zhang
The composition and content of γ-oryzanol significantly influenced its biological activity. The contents of γ-oryzanol in 19 Chinese brown rice ( Oryza sativa L.) cultivars were quantified and characterized using high-performance liquid chromatography/mass spectrometry . The total content of γ-oryzanol in these 19 Chinese brown rice cultivars ranged from 19.37 to 232.2 mg/100 g, with an average of 76.23 mg/100 g. Five specific steryl ferulates were identified. Cycloartenyl ferulate, 24-methylene cycloartanyl ferulate, and β-sitosteryl ferulate comprised approximately 82 % of the total γ-oryzanol content, while campesteryl ferulate and stigmastanyl ferulate constituted the remaining 18 %. Japonica and glutinous rice exhibited similar γ - oryzanol contents, which were significantly different from those of indica rice. No significant difference was observed in the total γ-oryzanol content between the short-grain and long-grain rice. However, there were significant differences in the steryl ferulates. Both latitude and longitude significantly influenced the γ-oryzanol content, and longitude had a more pronounced effect than latitude. Apart from the lack of correlation between cycloartenyl ferulate and β-sitosteryl ferulate, significant correlations were observed among the contents of the other steryl ferulates. This study offers valuable insights to scientifically assess the nutritional value of Chinese brown rice, guide the breeding of varieties and inform high-quality cultivation practices.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ying Gao,Yong Liu,Lingling Gao,Jinxing Long
An effective strategy is proposed here for transfer hydrogenation of alkyl levulinate to γ-valerolactone (GVL) using a UiO-66 framework modified with phosphotungstate ionic liquid (UiO-66@IL(HPW)). Due to the intensive influence of ionic liquid fragment, the modification significantly enhances the catalytic activity of UiO-66@IL(HPW), leading to a complete conversion of ethyl levulinate with over 93.1% selectivity for GVL. Characterizations techniques, including XRD, N 2 absorption/desorption, SEM, FT-IR, pyridine FT-IR, NH 3 -TPD and CO 2 -TPD, confirm that while the basic structure of UiO-66-NH 2 is insignificantly changed, the introduction of the ionic liquid greatly improves the acidic/base properties of the catalyst. XAFS and XPS results reveal an intensive interaction between the N and W species in UiO-66@IL(HPW), and the formed W-N/O moiety is responsible for the enhanced catalytic activity. In addition, a plausible catalytic mechanism is proposed based upon in situ DRIFTS and density functional theory (DFT) calculations, highlighting the crucial role of ionic liquid fraction within the UiO-66 ligand. Therefore, this work would contribute to the valorization of biochemicals.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yanli Zhao,Ziqi Cao,Yanxiang Liang,Zhichen Liang,Keyin Ling,Feiyan Zhou,Changsheng Guo,Yao Qian,Pengbi Liu,Xi Liu,Chunguang Wang,Mengchen Zhang,Qinglei Zhang
Membrane consisting of high-throughput aligned ion channels has been pursued for precise Li + /Mg 2+ separation. Herein, an aligned amino-functionalized γ-cyclodextrin nanofiltration membrane was fabricated via a customized interfacial polymerization technique, where the orientation of cyclodextrin ion channels was elaborately tailored by controlling the reaction conditions. The as-fabricated membrane featured ultra-thin selective layer of ∼ 26 nm, average pore size of ∼ 0.72 nm, and ultra-stable positive surface charges. In particular, the aligned intrinsic cyclodextrin cavities in the membrane offered vertical shortcuts for preferential Li + transport. Taking advantage of these, superior membrane permselectivity was achieved with the water permeance of 6.5 L·m −2 ·h −1 ·bar −1 and the Li + /Mg 2+ separation factor up to 22.5, highlighting the great potentials in lithium extraction and other ion separations. Given its simplicity and generality, this customized interfacial polymerization strategy holds great promise for manipulating aligned transport channels in thin film composite membranes, thereby enhancing their performance in a wide range of applications including, but not limited to, desalination, water purification, resource extraction, and energy conversion.
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POLYMER COMPOSITES
·
2024
·
IF 4.8
Bo Tian,Jie Zhao,Na Zhou,Jinfeng Li,Jizhuang Fan,Yunchen Du,Hongtao Zhao
Polymer-based radiation shielding materials are receiving more and more interests due to their desirable advantages in lightweight and maneuverability. Herein, we employ polypropylene (PP) as the matrix to construct γ -ray shielding composites through the embedment of PbO particles with a wet reaction melt blending method. From the changes in dynamic rheological behaviors and fracture surface of PP/PbO composite, it can be found that the gradient addition of PbO particles facilitates the formation of heterogeneous network structure with, and high PbO content may make the composites undergo a “liquid–solid” transition. Rheological temperature and time scanning show that both PbO content and heterogeneous network structure greatly contribute to the storage modulus ( G ') and thermal stability. The γ -ray ( 137 Cs) shielding tests manifest that BPP/PbO-4 has the best shielding performance, whose thicknesses of half value layer ( HVL ) and tenth value layer ( TVL ) are 0.32 and 1.05 cm, respectively, obviously smaller than those shielding materials ever reported. The analyses on effective atomic number ( Z eff ) and effective electron density ( N E ) reveal that the good shielding performance of BPP/PbO-4 benefits from its proper content and dispersion of PbO particles.
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Catalysts
·
2024
·Vol. 14
·期 7
·428
·
IF 3.8
Weiying Wang,Changlin Chen
Tetrahydrofurfuryl alcohol, a cost-effective biomass derivative, offers a sustainable path for synthesizing 1,5-pentanediol through hydrogenolysis. To develop the efficient production of 1,5-pentanediol from this alcohol, we have prepared a series of MgAl2O4-modified Pt/WOx/γ-Al2O3catalysts with varying compositions via impregnation–calcination methods. The physicochemical properties of these catalysts were subsequently characterized using diverse techniques. Characterization revealed that magnesia–alumina spinel modification enhanced Pt particle dispersion, CO adsorption on Pt/WOx/γ-Al2O3, reduced Pt particle reduction temperature, diminished the acid content in the catalysts, and increased the surface oxygen vacancy concentration. These alterations appear to influence the catalyst performance, though other factors cannot be ruled out. Catalytic activity tests demonstrated that magnesia–alumina spinel modification improved tetrahydrofurfuryl alcohol hydrogenolysis activity and the 1,5-pentanediol selectivity of Pt/WOx/γ-Al2O3. Optimal performance was achieved at 12% magnesia–alumina spinel loading, with a tetrahydrofurfuryl alcohol conversion of 47.3% and 1,5-pentanediol selectivity of 88.4%.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Jingru Qiu,Guo-Qing Yang,Jiachang Zuo,Xiaoying Liu,Zhipeng Lan,Weikun Chen,Zhong-Wen Liu,Youzhu Yuan
The selective oxidation of methyl glycolate (MG) to methyl glyoxylate (MGO) using molecular oxygen in a fixed-bed reactor represents a greener and more efficient alternative to the traditional batch processing for producing this important fine chemical and intermediate. Despite its potential, detailed understanding of this catalytic reaction is still limited. In our study, VO x / γ -Al 2 O 3 catalysts were identified as effective for the reaction, but their performance strongly depended on the structure of VO x species. The optimal catalyst with nearly monolayer dispersed VO x achieved a high MG conversion of 91% and an MGO selectivity of 71%, alongside maintaining stability for 300 h without noticeable deactivation. At a low V loading of 0.6%, isolated VO x species were formed, exhibiting the highest turnover frequency (TOF) but the lowest MGO selectivity. Increasing the V loading to 3.9% resulted in a blend of less polymeric and isolated VO x species, which decreased the TOF but enhanced MGO selectivity to 59%. With the V loading ranging from 5% to 6.2%, monolayer dispersed VO x became dominant, yielding a lower TOF and the highest MGO selectivity. A further increase in V loading caused the emergence of crystalline V 2 O 5 , which seemed to act as a bystander. Moreover, the redox cycles of V 4+ and V 5+ over the VO x / γ -Al 2 O 3 catalyst played an important role in the selective oxidation of MG to MGO, while the overoxidation of MG to CO 2 might take place through the V 3+ /V 4+ redox pairs, the extent of which was determined by the structure of VO x species. These insights are crucial for developing high-performance VO x -based catalysts for the production of MGO through the selective oxidation of MG.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Changshun Deng,Xiaorong Zhu,Jun Yao,Yibo Wang,Chenyang Shen,Bingqing Ge,Chaoxiang Li,Nianhua Xue,Luming Peng,Xuefeng Guo,Yan Zhu,Yafei Li,Weiping Ding
The direct oxidation of toluene by O 2 to benzaldehyde with high efficiency is a bright route for the green production of benzaldehyde but still a significant challenge. In this study, we develop a ligand modification strategy by bonding organophosphonic acid (OPA) to VTiO x /γ-Al 2 O 3 to restructure its interface microenvironment for enhancement of toluene oxidation to benzaldehyde. The as-prepared catalyst exhibits excellent selectivity over 99 % under mild conditions. Results of comprehensive characterizations and calculations reveal that the OPA bonding in bidentate with the V 6-coordinated species causes noticeable phase reconstruction between VO x and TiO 2 , thereby generating nearby new reactive oxygen species, which is responsible for the conversion of toluene to benzaldehyde at temperatures as low as ∼50 °C, much lower than that over VO x /TiO 2 (>130°C). The interface microdomain around the bonding site of OPA helps to significantly weaken the methyl C H bond of toluene molecule in reaction manifested as the significant decrease in apparent activation energy. Hence, the current work reveals a novel mechanism of the typical catalyst VO x /TiO 2 under OPA bonding, which is useful to solve the classic difficult reaction of toluene to benzaldehyde by O 2 oxidation.
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PubMed
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Advanced Sensor Research
·
2025
·
IF 3.5
Jiahong Wen,Yaxin Wang,Ruoning Chu,Jinhai Li,Ze Chen,Yongjun Zhang,Xiaoyu Zhao,Qi-Qi Fu
Freon refrigerants, whose leakage will cause serious safety and environmental issues, have an urgent need of developing leakage detection technologies. Conventional metal oxide semiconductor (MOS) gas sensors exhibit limited efficacy in detecting halogenated Freons due to their chemical inertness and weak charge-transfer interactions. While recent innovations employing mesoporous γ-Al 2 O 3 overlayers have enabled Freon detection via catalytic decomposition sensing mechanism, the achieved sensing performance remains suboptimal. In this work, this issue is addressed by engineering a Pd-doped mesoporous γ-Al 2 O 3 /SnO 2 (Pd-γ-Al 2 O 3 /SnO 2 ) gas sensor. The doped Pd atoms not only accelerate the decomposition of Freon molecules on the catalytic layer but also induce the Schottky-barrier effect in the SnO 2 sensing layer. Benefiting from the synergistic effect, the Pd-γ-Al 2 O 3 /SnO 2 gas sensor shows outstanding response, good stability, repeatability, selectivity, and rarely-reported universality in sensing different Freon gases. Notably, a valuable solution is demonstrated in the leakage detection of next-generation refrigerants, Freon R1234yf. The sensing mechanism is deduced by exhaust gas components identification. These results highlight the promising potential for addressing the real-world needs of Freon refrigerant leakage detection technology.
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Food Frontiers
·
2024
·
IF 7.4
Jiaying Liu,Yu Fu,Liang Ma,Hongjie Dai,Hongxia Wang,Hai Chen,Hankun Zhu,Yong Yu,Xin Liu,Zhengfang Liu,Yuhao Zhang
A high-salt diet can induce hypertension, so salt reduction can prevent hypertension. γ-Glutamyl peptides (GGPs) have obvious taste-enhancing effects, while their contents in natural foods are relatively low. Yeast protein rich in Glu/Gln is a good precursor for the preparation of GGPs. In this study, yeast protein-derived GGPs were prepared through hydrolysis and transpeptidation reactions, followed by sensory evaluation and E-tongue analysis. Peptide sequences were identified by LC−MS/MS and screened for molecular docking. The optimal reaction conditions were hydrolysis for 4 h, enzyme concentration of 16 U/g, and transpeptidation for 4 h. GGPs could increase salt and umami intensity by 60.78% and 40.93% based on sensory evaluation, 22.52%, and 16.40% according to E-tongue analysis. Fifteen γ-glutamyl peptides with different peptide lengths were selected for molecular docking. Molecular docking confirmed their binding to calcium-sensing receptors (CaSr) through hydrogen bonds and hydrophobic interaction, while interaction between CaSR receptor and γ-glutamyl di-, tri-, and oligo-peptides varied in binding energy. The stimulation received by CaSR lasted a longer time and varied in intensity. It was further proved that the flavor of mixed peptides has a layered sense and can give people a rich taste experience. Overall, yeast protein-derived GGPs can enhance salt and umami taste, which can reduce salt usage without compromising taste.
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