FUEL
·
2024
·
IF 6.7
Renjie Ji,Defu Yin,Yao Chen,Like Ma,Fanglin Lv,Yuhao Zhang,Zhen Jia,Jingyun Zhang,Mingya Liu,Shitao Yu,Yue Liu
A core–shell catalyst mZSM-5@SO 4 2- /mSiO 2 composed of mZSM-5 core and SO 4 2- /mSiO 2 shell was prepared by the soft template method. Core-shell structure could promote the building of Brønsted -Lewis (B-L) acids interface and significantly improve the synergistic effect of B-L. In this paper, the Brønsted/Lewis (B/L) of mZSM-5@SO 4 2- /mSiO 2 was targeted regulating by innovatively introducing Brønsted acid (BA) sites into the shell. The optimal mZSM-5@SO 4 2- /mSiO 2 catalyst (B/L = 0.142) could achieve 72.1 % furfural yield at 140 ℃ for 1 h. In addition, 70.2 % furfural yield could be obtained after the catalyst was recycled and regenerated for 5 times. Combining In-situ IR and 13 C NMR, the reaction path was revealed in detail: xylose was first isomerized to xylulose and then dehydrated to furfural. This paper provides a research idea for the directional regulation of dual active sites of cascade reaction catalysts.
研究领域:
催化化学
·
生物质转化
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 25
·15054-15059
·
IF 3.361
Miaojia Song,Xiaohui Di,Yu Zhang,Yongming Sun,Zhongming Wang,Zhenhong Yuan,Ying Guo
As an important bio-based chemical, methyl levulinate (ML) can be produced via enzymatic esterification of levulinic acid with methanol. A kinetic model is developed in this work based on the law of mass action and reaction reversibility, to investigate the effect of enzyme loading, alcohol/acid ratio and temperature on ML yield. Data analysis shows that newly developed binary regression is apparently more persuasive than the commonly used unitary regression. Kinetic study reveals: (1) rate constants of esterification/hydrolysis increase with increasing enzyme loading, while their ratio (equilibrium constant) remains invariant. (2) Methanol has no toxicity towards lipase, and hence, neither the rate constants of esterification/hydrolysis nor the equilibrium constant are affected by alcohol/acid ratio. (3) Both rate constants of esterification/hydrolysis and the equilibrium constant increase with temperature elevation, and their relationships agree with Arrhenius equation and Van't Hoff equation, respectively. (4) The esterification is endothermic and spontaneous. In total, the application of binary regression analysis for the developed model to study the enzymatic esterification kinetics is quite successful.
研究领域:
生物化学
·
酶工程
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DOI
高影响因子
Fermentation-Basel
·
2024
·Vol. 10
·期 11
·542
·
IF 3.3
Qinwu Li,Baozhen Zhu,Fei Li,Zhiyuan Ma,Long Guo,Xiuxiu Weng
Plectasin, a novel antimicrobial peptide, has the potential to disrupt bacterial cell walls and alter the rumen fermentation mode, making it a superior alternative to antibiotics. However, there is limited research on the effects of plectasin on rumen microbiota. This study aimed to evaluate the effects of plectasin (0.057 μmol/L) on in vitro rumen fermentation characteristics and select groups of rumen bacterial communities in comparison with monensin (5 μmol/L), one of the most commonly used ionophores in ruminants, and as a control treatment with the basal substrate. Unlike monensin, plectasin was found to increase the molar proportions of butyrate and acetate/propionate ratio (p< 0.001) while decreasing pH and the molar proportions of propionate (p< 0.05). Principal component analysis of bacterial 16S rRNA gene amplicons clearly showed a separation between the bacteria shaped by plectasin and monensin. Comparative analysis also revealed differences in the relative abundance of certain bacteria in different taxa between plectasin and monensin. The divergent effects of plectasin and monensin on bacterial communities are likely responsible for the differences in their ability to alter rumen fermentation. Plectasin may have advantages over monensin in modulating ruminal bacterial communities and increasing the butyrate and the acetate/propionate ratio. Therefore, it may be considered as a potential additive for ruminant feed.
研究领域:
畜牧学
·
微生物学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Li-Li Luo,Ming-Jun Zhu
Furfural-tolerant and hydrogen-producing microbial consortia were enriched from soil, with hydrogen production of 259.84 mL/g-xylose under 1 g/L furfural stress. The consortia could degrade 2.5 g/L furfural within 24 h in the xylose system, more efficient than in the sugar-free system. Despite degradation of furfural to furfuryl alcohol, the release of reactive oxygen species and lactate dehydrogenase was also detected, suggesting that furfuryl alcohol is also a potential inhibitor of hydrogen production. The butyrate/acetate ratio was observed to decrease with increasing furfural concentration, leading to decreased hydrogen production. Furthermore, microbial community analysis suggested that dominated Clostridium butyricum was responsible for furfural degradation, while Clostridium beijerinckii reduction led to hydrogen production decrease. Overall, the enriched consortia in this study could efficiently degrade furfural and produce hydrogen, providing new insights into hydrogen-producing microbial consortia with furfural tolerance.
研究领域:
环境微生物学
·
生物能源
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Zunlong Hu,Peng Hu,Xiulin Wang,Tongtong Wu,Sida Ge,Haodong Xie,Baijun Liu,Shengli Chen,Zhijie Wu
The hydrocracking catalyst is characteristic of bifunctional catalyst mainly requiring metal–acid balance, which includes metal–acid ratio and metal–acid proximity. Here, we screened and clarified the optimal metal–acid balance on 1-methylnaphthalene (1-MN) hydrocracking by adjusting metal–acid ratio (n M /n A ) via physically mixing the γ-Al 2 O 3 supported NiW samples and Beta zeolite with different acidity (denoted as NiW/AB(x) and x presents the molar ratio of SiO 2 /Al 2 O 3 for Beta zeolite). NiW/AB(60) catalyst with a n M /n A of 0.40 showed the highest BTX selectivity (14.4 %) at a 1-MN conversion of 76.6 %, suggesting an optimal site balance between the metal sulfide site and medium-strong acid sites ( ca . 1:2.5). Also, four different metal–acid proximities with centimeter, millimeter, micrometer and nanoscale distances were compared. The nanoscale proximity enabled the highest BTX selectivity (19.6 %) as compared to the microscale (14.4 %), millimeter scale (12.4 %) and centimeter scale (7.1 %) catalysts, confirming that the selectivity of BTX benefited from the fast diffusion for transporting reaction intermediates between metal and acid sites. Thus, we realized a n M /n A of 0.40 and a nanoscale site proximity for improving the reactivity and selectivity of 1-MN hydrocracking. This work not only presents an elegant showcase of achieving the synergistic effects of bifunctional catalyst, but also provides a rational approach for enhancing the catalytic performance of hydrocracking and beyond.
研究领域:
催化
·
化学工程
·
石油化学
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DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 17
·2970
·
IF 5.1
Yuxin Shi,Mingna Dong,Xuhui Lei,Zhiying Xu,Jiyan Sun,Yingying Zhao,Yichao Ma,Hui Zhou,Shu Liu,Yunhai He,Qiukuan Wang,Dandan Ren
This study investigated how different extraction parts of raw materials and different flocculation methods affect the extraction yield, structure, and properties of sodium alginate. The aim was to improve the quality of sodium alginate and provide theoretical guidance for upstream enterprises. In this study,Lessonia nigrescens(LN) was used as a raw material. The alkali treatment conditions were optimized. The optimal extraction conditions were determined to be a 2% sodium carbonate concentration, a duration of 4 h, a material-to-liquid ratio of 1:40, and a temperature of 60 °C, achieving an extraction yield of 43.03%. LN was categorized into blades, stipes, holdfasts, and whole seaweed for comparative analysis, and sodium alginate was flocculated using the acid, calcium, and ethanol methods. Structural and physicochemical analyses showed that the mannuronic acid/guluronic acid (M/G) ratios of the twelve sodium alginate samples ranged from 5.73 to 8.76. The LN part had a greater influence on the M/G ratio than the flocculation method. The relative molecular weight (2343–3074 kDa) and viscosity (170–331 mPa·s) exhibited consistent trends. For the same part, the effect of the flocculation method on the molecular weight followed the order ethanol > acid > calcium. The physicochemical properties of the extracted sodium alginate met the requirements specified in the physicochemical index standard GB 1886.243-2016 of China.
研究领域:
海洋多糖化学
·
食品科学与技术
·
生物高分子提取与表征
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yingdi Dong,Lingyu Rao,Yong Zeng,Tao Peng,Jiahao Huang,Yanxiu Wang,Yuping Fan,Zhiyong Gao,Honghu Tang,Wei Sun
The solid–liquid separation of coal tailings is crucial for enhancing coal resource utilization and water circulation. With the mining and processing of low-quality coal, the coal flotation tailings (CFT), characterized by fine particle size, variable mineral composition and complex particle surface properties, presented significant challenges to efficient solid–liquid separation. This study synthesized a series of polycarboxylate ether (PCE) reagents with tunable structure to optimize solid–liquid separation performance and investigate their interaction mechanisms with CFT. The results showed that increasing the carboxyl acid ratio in PCE significantly improved settling and filtration performance. Increasing the carboxyl acid ratio in PCE from 2:1 to 6:1 improved settling rate by 6.5 times and sediment solid content by 9.13 wt%, while reducing specific filtration resistance by 42.86% and filter cake moisture by 3.14%. Analysis of particle surface electrical property and wettability indicated that an increase in the carboxyl acid ratio in PCE enhanced its ability to neutralize the negative charges on the particle surface and its hydrophobic ability. The growth behavior and properties of flocs were investigated by means of focused beam reflectance measurement microscopic observation and fractal dimension analysis. The results showed that an increase in carboxyl acid ratio in PCE promoted floc growth, regrowth, and shear resistance. The floc size increased by 10.48%, and the fractal dimension increased from 1.532 to 1.636, resulting in the formation of flocs with a denser structure. These improvements in floc properties were closely related to the enhancement of CFT settling and dewatering performance. This study provided new insights into the mechanisms of PCE in enhancing solid–liquid separation of coal tailings and highlighted its potential for treating complex tailings.
研究领域:
化学工程
·
矿物加工
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Peixin Wang,Ruilong Zhang,Ifunanya Rejoice Akaniro,Puranjan Mishra,Reeti Kumar,Jun Zhao
Catalytic dehydration of fructose to 5-hydroxymethylfurfural (HMF) is a key reaction in biomass valorization and sustainable chemistry. The development of solid acid catalysts with high selectivity for HMF remains challenging due to the formation of undesired by-products, such as levulinic acid and formic acid in the reaction. In this study, SrNb2O6 catalysts with various morphologies were prepared by a facile one-step hydrothermal method, triggering synergetic catalysis for selective transformation of fructose to HMF. Among the Nb-based mixed oxides synthesized under varying conditions, including different pH environments and Nb concentrations, SrNb2O6 nanorods (denoted as SNO-NR, with pH = 13 and Sr/Nb ratio of 1:2) demonstrated the highest catalytic performance. Specifically, it achieved a 74.9% HMF yield and a selectivity of 78.5% in DMSO at 120°C for 1 hour. Comprehensive characterization analyses collectively indicated that an optimal acid capacity and a balanced Brønsted/Lewis acid ratio, which facilitate synergistic effects, are critical for achieving a highly selective conversion of fructose to HMF. Furthermore, it is also noteworthy that this SNO-NR catalyst was recyclable and stable for up to six runs with a minor reduction in its activity, confirming its remarkable robustness.
研究领域:
催化化学
·
可持续化学
·
纳米材料
·
生物质高值化
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产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yuanqing Li,Zhuan Peng,Lingling Liu,Junbo Wang,Yi Zhu,Yizhou Gao,Branimir Pavlić,Jian Lou,Zhaojun Ban,Yunbin Jiang
Both pericarp shrinkage and the sugar-acid ratio are vital factors influencing consumer preference in the apple industry. Our study examines the relationship between extrinsic appearance and intrinsic properties by investigating the effects of sugar-acid content on shrinkage, apple fruit development and shrinkage presence were investigated while the fruit was stored at 5 °C with 60 % relative humidity for up to 70 days, which categorized by packaging in microporous plastic bags. Pericarp shrinkage was assessed by exploring fruit sensory preferences, variations in structural differences, and physiological compositional status, and correlations were analyzed. Shrinkage significantly reduced water loss rate (4.44 %), accelerated water core dissipation and microcrack growth, and correlated with total sugar (r = 0.59) and total acid (r = 0.75). Summarily, pericarp shrinkage correlated positively with fructose (r = 0.37), glucose (r = 0.56), and succinic acid (r = 0.55) accumulation, but negatively with citric acid (r = -30) accumulation. The present study serves as a novel exploration of how pericarp shrinkage and sugar-acid biosynthesis and distribution in apples, losses due to cosmetic defects can be reduced for further research.
研究领域:
植物学
·
食品科学
·
采后生理学
·
植物生物化学
·
农业科学
✓ 已验证
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Jing Zhang,Jingyi Yang,Xudong Han,Yuyao Ren,Yan Liu,Bohao Zhao,Xinsheng Wu,Yang Chen
Rabbit meat is recognized for its nutritional benefits and affordability. However, research into the primary factors influencing its flavor, especially among various rabbit breeds, remains insufficient. This study conducted a comprehensive comparison of meat quality, metabolomic, and transcriptomic profiles between the longissimus dorsi muscles of Fujian yellow rabbits (FJY) and New Zealand white rabbits (NZW), which exhibit significant variations in body size and growth rate. A total of 68 samples, with 34 from each breed, were analyzed. Results indicated that FJY rabbits had lower body weights but higher dressing percentages than NZW rabbits. FJY meat was higher brightness (L*) and yellowness (b*), lower redness (a*), along with significantly reduced cooking losses. In terms of proximate composition, FJY meat exhibited higher protein and collagen levels but significantly less fat and moisture than NZW meat. Additionally, FJY meat contained higher levels of myristic acid, palmitoleic acid, cis-11-eicosapentaenoic acid, α-linolenic acid, and a higher MUFA/FA ratio. Metabolomic analysis using HPLC-MS/MS identified 231 differential metabolites, including amino acids and their derivatives, organic acids, and heterocyclic compounds. Transcriptomic analysis via RNA-seq revealed 211 differentially expressed genes potentially involved in meat quality regulation. Integrated analyses identified 70 KEGG pathways associated with pivotal genes, such as CPT2, PAK1, SLC7A7, and TAS1R2 , which exhibited correlations with differential metabolites like cholesterol, benzoic acid, putrescine, and N-acetylcysteine, suggesting a synergistic effect on meat quality. Overall, these findings provide valuable insights into the distinct meat quality characteristics that underpin the improved quality and flavor of rabbit meat.
研究领域:
动物科学
·
分子生物学
·
食品科学
·
营养学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xue Wang,Jing Zeng,Xingmei Lu,Jiayu Xin,Suojiang Zhang
Butene plays an essential role in the area of petrochemical industry. The production of butene from the biomass-derived platform molecule γ-valerolactone (GVL) is of great interest. GVL decarboxylation reaction occurred under high temperature because the catalytic activity of the catalysts used before was not efficient for this reaction. In this work, beta zeolite with Si:Al = 5 was synthesized and used for GVL decarboxylation. It exhibited a higher catalytic performance than other commercial zeolites due to a large number of Lewis acid sites and relatively large micropore size. At 300 °C, 99.5% GVL conversion and 98% butene yield were obtained after condition optimizing. For further research, the influence of the Brønsted/Lewis acid ratio was investigated, and it turned out that Lewis acid was more active than Brønsted acid in crystalline material on GVL decarboxylation for the first time.
研究领域:
石油化工
·
催化
·
绿色化学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2024
·
IF 2.6
Zhu Jie,Zhang Hua-nan,Wu Jia-kai,Li Fei-fei,Liu Yu-qing,Ning Er-juan,Yu Li-qin,Liang Shen
Camelina sativa oil (CSO) and Semen Ziziphi Spinosae oil (SZSO) are functional oils that have beneficial effects on brain health. This study evaluated the sedative and hypnotic effects of vegetable oils with various n − 6/n − 3 polyunsaturated fatty acids (PUFA) ratios and ɑ-linolenic acid (ALA) contents to mice. The n − 6/n − 3 PUFA ratios of CSO (CSO:SZSO = 1:0, 1.8 g/kg), SZSO (CSO:SZSO = 0:1, 1.8 g/kg), CSO-SZSO-L (CSO:SZSO = 1:1, 1.8 g/kg), and CSO-SZSO-H (CSO:SZSO = 1:1, 3.6 g/kg) were 0.51, 140, 1.69, and 1.69, respectively. The doses of ALA administered to mice with p-chlorophenylalanine-induced insomnia were approximately 0.64, 50 × 10 –4 , 0.32, and 0.64 g/kg, respectively. The mice were administered CSO, SZSO, and a low-dose combination of CSO and SZSO for seven days with no obvious hypnotic effects. However, the administration of a high-dose combination of CSO and SZSO significantly prolonged sleep duration in mice with induced insomnia and inhibited the serum levels of corticotropin-releasing hormone, adrenocorticotropic hormone, and cortisol. Interestingly, there were no significant effects on the structure and function of the hippocampal tissue. The results indicated that the anti-insomnia effects of these vegetable oils were positively correlated with a low n − 6/n − 3 PUFA ratio and the absolute amount of ALA.
研究领域:
营养学
·
神经科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）