JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Run Liu,Qi Zhou,Yi Zhang,Yuanzhi Xu,Zhonghui Liu,Kheng-Lim Goh,Vladimir Zivkovic,Mingming Zheng
Enzymatic synthesis of flavor esters is widely used in the food and flavor industries, but challenges remain in improving the catalytic efficiency and stability of biocatalysts. This study evaluates the performance of a novel biocatalyst, CALB@DMSN-C8, formed by immobilizing Candida antarctica lipase B (CALB) on hydrophobic dendritic mesoporous silica nanospheres (DMSN-C8), for synthesizing flavor esters. The CALB@DMSN-C8 catalyst achieves a caproic acid conversion rate of 98.5 ± 0.5% in just 30 min and demonstrates outstanding thermal stability, retaining a high conversion efficiency over 20 reuse cycles. To our knowledge, this study represents the most efficient synthesis of flavor esters, including ethyl valerate, ethyl caproate, ethyl heptanoate, and ethyl caprylate, compared to studies in the existing literature. Analysis of aroma characteristics and molecular docking simulations revealed the typical flavor profiles and synthesis mechanisms of various mellow esters. This study develops an innovative strategy by using self-made immobilized lipases to catalyze the production of flavor esters with potential applications in food and cosmetics.
研究领域:
食品科学
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酶工程
·
生物催化
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhichang Bao,Lei Yang,Zhenmin Cheng,Zhiming Zhou
A non-noble NiZn3/α-Al2O3 catalyst was prepared by a urea co-precipitation method, which showed good stability and high selectivity to styrene (ST) (92% selectivity at above 99% conversion of phenylacetylene (PA)). The high selectivity was mainly attributed to the electronic effect of the Ni–Zn alloy. The selective hydrogenation of the C8 aromatic fraction on NiZn3/α-Al2O3 was well described by a Langmuir–Hinshelwood-type kinetic model. The estimated activation energies for the hydrogenation reactions of PA → ST, ST → ethylbenzene (EB), and PA → EB were 70.31, 81.65, and 74.88 kJ/mol, respectively. A reactor model allowing for an intraparticle diffusion-reaction and external mass transfer was further developed to describe the selective hydrogenation of the C8 aromatic fraction on larger NiZn3/α-Al2O3 particles in a fixed-bed reactor. The observed changes in product composition with the reaction conditions were well predicted by the model, and the results demonstrated that phenylacetylene can be completely removed without loss of styrene under certain conditions.
研究领域:
化学工程
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催化化学
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Wenkai Lyu,Fei Hu,Junwei Fan
In this study, rice starch was ultrasound-assisted (power = 0 W, 200 W, and 450 W) succinylated with C8–C14 anhydrides under controlled conditions, with the major aim of balancing side-chain lengths and degree of substitution (DS) for superior amphiphilicity and emulsification. A bell-shaped relationship between chain lengths and functionality was observed, peaking at decenyl succinic anhydride (DSA, C10)-modified starch, particularly DSA-450 W achieved optimal amphiphilicity (θ = 86.3°), emulsification performance (EAI = 34.3 m 2 /g, ζ-potential = −80.4 mV, CI > 61 % over 21 days), and a lower DS than OSA. Conventional octenyl succinic anhydride (OSA, C8) modification exhibited the highest swelling power (18.9 g/g) and peak viscosity (1348.5 BU). High-power ultrasound most enhanced tetradecenyl succinic anhydride (TDSA, C14) modification, yet the suboptimal contact angle and emulsification properties of TDSA-starch challenge conventional wisdom and show that longer hydrophobic side chains do not necessarily yield better performance. In summary, DSA-modified starch balances moderate hydrophobic chain lengths with reactivity and is expected to be an ideal alternative to OSA, offering a promising strategy for stabilizing Pickering emulsions with enhanced stability and cost-effectiveness in food and non-food applications.
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Materials Today Chemistry
·
2026
·
IF 7.4
Jingdong Gou,Xianjie Wang,Qibin Xia,Jinhui He,Xue Ma,Yaning Zhao,Hengsheng Wei,Louwei Cui,Huiyong Chen,Jun Yang,Liuyi Pan,Dong Li
The precise regulation of sub-nanometer pore structures in carbon molecular sieves (CMS) is pivotal for the efficient separation of C8 cycloalkane isomers. This study addresses the separation challenge between ethylcyclohexane (ECH) and its cis-1,2-dimethylcyclohexane(cis-1,2-DMCH) and trans-1,3-dimethylcyclohexane(trans-1,3-DMCH) counterparts. We systematically investigate the structural properties of CMS with tunable pore sizes in the sub-nanometer range (5.4–29 Å) and their impact on the adsorptive separation performance for C8 cycloalkanes. A material system comprising six CMS samples with distinct pore dimensions was constructed. By integrating static adsorption, kinetic analysis, dynamic breakthrough experiments, and molecular dynamics simulations, we elucidate the structure–performance relationships. The results demonstrate that CMS-4, featuring a narrowly distributed ultramicropore size of 6.4 Å and a high micropore volume (0.42 cm 3 g −1 ), exhibits optimal adsorption capacity for ECH (19.4 mg g −1 ) and superior selectivity (with selectivity coefficients of 1.98 and 2.02 over cis-1,2-DMCH and trans-1,3-DMCH, respectively). Adsorption kinetic studies reveal a diffusion rate order of ECH > trans-1,3-DMCH > cis-1,2-DMCH, which aligns well with the hierarchy of effective molecular widths derived from their minimum cross-sectional areas, confirming the regulatory role of molecular geometry in diffusion behavior. Dynamic breakthrough experiments further validate the selective separation capability of CMS-4 for ECH under continuous flow conditions. Molecular simulations clarify that the differences in diffusion behavior originate primarily from steric hindrance effects related to molecular cross-sectional size, while the stronger interaction energy between ECH and the carbon framework provides a thermodynamic basis for its preferential adsorption. The three-dimensional "pore-size matching–molecular size–diffusion kinetics" correlation model established in this work provides both a theoretical foundation and experimental support for the rational design and performance optimization of high-performance carbon molecular sieves aimed at efficient liquid-phase isomer separation.
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ENVIRONMENTAL AND EXPERIMENTAL BOTANY
·
2025
·
IF 4.7
Qi Liang Zhu,Nian Zhao Wang,Wen Hao Han,Shu Qi Ma,You Lv,Yan Ping Wang
Root-microbe transboundary communication is important to dominate the interaction between plant and microorganism. However, the influence of quorum sensing signals among bacteria community on the root growth and development is still obscure. The study focused on one quorum sensing signal isolated from poplar rhizosphere, N -octanoyl-DL-homoserine lactone (C8-HSL), and examined its influence on the morphological structure, ultrastructure, and subcellular structure of poplar roots. Transcriptome and metabolome sequencing were further performed to reveal the potential mechanisms of C8-HSL regulating the root morphological development. The results showed C8-HSL demonstrated dual regulatory effects on the growth of poplar fine roots. At high concentrations (more than 100 μM), root growth of poplar seedlings was suppressed by C8-HSL, and the primary and lateral roots appeared short and thick. Conversely, at low concentrations (10 nM), root growth was promoted by C8-HSL, and the primary and lateral roots were elongated. Fluorescent probes indicated that Ca 2 + , reactive oxygen species (ROS), and nitric oxide (NO) in root tip cells were significantly up-regulated at concentrations more than 1 μM of C8-HSL, while only Ca 2+ and NO concentration were significantly up-regulated at concentrations less than 1 μM of C8-HSL. Transcriptome and metabolome analysis further revealed that high concentration C8-HSL significantly upregulated the expression of poplar genes related to secondary wall biogenesis (e.g., MYB46 , MYB83 , CESA ) and auxin transport (e.g., PIN6 , AUX22B , GH3.6 ). In contrast, low concentration C8-HSL upregulated calmodulin expression and increased indoleacrylic acid and 3-indolebutyric acid content. Taken together, these findings provide a deeper insight to the interaction between root and microbes, and imply the potential utilization of quorum sensing signals in regulating root growth.
研究领域:
植物生物学
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微生物学
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分子生物学
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生物信息学
·
信号转导
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 23
·2213788
·
IF 19
Yanling Xiao,Wei Deng,Jiajing Hong,Xiaobin Ren,Xiujuan Zhang,Jialin Shi,Fangming Sheng,Xiaohong Zhang,Jiansheng Jie
Application-oriented growth of patterned organic semiconductor (OSC) thin films with a single domain is a nonnegotiable requirement for the manufacturing of high-performance organic electronic devices. However, the prevalent selective-wetting patterning method remains a challenge in controlling the density of nucleation events in microscale spaces, resulting in thin films with high grain boundary density and no preferential orientation spherulites. Herein, a simple double-blade-coating printing technique using a combination of wetting-patterned substrates to produce an array of highly crystalline OSC thin films is developed. Specifically, the approach confines the OSC crystallization on a molecular-flat water surface in specific areas, enabling a significant reduction in the number of nuclei. Consequently, patterned 2,7-dioctyl[1]benzothieno[3,2-b] benzothiophene (C 8 -BTBT) thin films comprising single-crystal domains are achieved with an exceptionally high yield of 62.5%. The organic field-effect transistor array developed from such patterns of C 8 -BTBT single-crystalline films exhibits an excellent average mobility of 11.5 cm 2 V −1 s −1 which is 12.5-fold higher compared to that of the reference sample fabricated via conventional single-blade coating. It is believed that this approach can be widely applied to other soluble organic materials, thereby opening up opportunities for fabricating multicomponent integrated electronics.
研究领域:
材料科学
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纳米技术
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有机电子学
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半导体器件
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
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IF 5.2
Irshad Hussain,Liu Shijiang,Nadeem Muhammad,Qamar Subhani,Ni Chengzhu,Umar Arif,Zhuo Yanhong,Zhu Yan
For reducing operational complexity and expenses in HPLC laboratories, the development of versatile mixed-mode stationary phases into a single platform as an alternative to using two or even three single-mode columns are in high demand. PAMAM dendrimers, characterized by a tunable multifunctional globular structure, have attracted considerable attention for the development of stationary phases. This study, for the first time, reports the synthesis of a mixed-mode stationary phase using G 2.0 PAMAM (mixed-core). The synthetic protocol involved three steps: (i) synthesis of conventional EDA-core dendrimer up to generation 1.5; (ii) aminolysis of resulting G 1.5 PAMAM with 1,8-diaminooctane (1,8-DAO) to obtain mixed-core G 2.0 PAMAM having aliphatic C8 groups; and (iii) its grafting to silica base followed by quaternization using glycidol. The synthesis and fabrication of this stationary phase was validated through NMR, FTIR, BET, TGA, zeta potential, and elemental analysis. The retention mechanism of the stationary phase was investigated by varying the chromatographic conditions and quantum chemistry calculations. The successful separation of a wide range of substances, including alkylbenzenes, polycyclic aromatic hydrocarbons, phenols, nucleosides and bases, organic acids, and inorganic anions on the newly developed column not only revealed its versatility for RPLC/HILIC/IEC mixed-mode chromatography, but also showed certain superiority to commercial columns. Moreover, the column exhibited excellent compatibility to 100% aqueous mobile phase–a step towards green chemistry principles for HPLC separations. The results implied that the proposed stationary phase holds significant prospects for separation of other classes of compounds, particularly the ones with certain degree of polarity.
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TALANTA
·
2021
·
IF 6.057
Hua-Ming Xiao,Yan Shi,Yong-Xue Yang,Shuai Zhao,Xian Wang
The free fatty acids that contain one to eight carbons (C 1 –C 8 ) in biodiesel would affect the quality of biodiesel. It is still a matter of challenge to simultaneously determine the composition of C 1 –C 8 fatty acids in seed oil and seed oil-based biodiesel. Herein, a novel method of charge derivatization coupling with direct infusion mass spectrometry (CD-DIMS) was developed for the determination of the C 1 –C 8 fatty acids in biodiesels. A fixed-charge derivatization reagent, 1-cyclohexyl-3-(2-morpholinoethyl)carbodiimide (CMCT), was used to convert fatty acids into their cationic derivatives, which significantly improved the sensitivity and selectivity of detection. Good linearity was observed with the limits of detection (LODs) in the range of 0.0002–0.001 μg mL −1 for the investigated fatty acids. The recovery was in the range of 85.1%–101.9% and the matrix effect was within the range of 75.5–93.2%. The developed method was carried out to analyze C 1 –C 8 fatty acids in rubber seed oil (RSO) and RSO-based biodiesels produced by different catalysts, including NaOH, TiO 2 , and carbodiimide . It was also applied to the dynamic monitoring of C 1 –C 8 fatty acids in RSO and produced RSO biodiesels during the oxidation process. As results, formic acid , acetic acid, and propionic acid were detected in aged RSO and biodiesel samples. The contents of formic acid, acetic acid, and propionic acid all increased in aged RSO and biodiesels, but with different growth rates. These results demonstrated that the developed CD-DIMS method can provide a quick, accurate, and sensitive analysis of C 1 –C 8 fatty acids in seed oil and biodiesel samples.
研究领域:
分析化学
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能源科学
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PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2018
·
IF 3.974
Rui Wang,Xiaoguo Ma,Xiaojun Zhang,Xin Li,Danping Li,Yongfeng Dang
Phthalate acid esters (PAEs) are extensively applied in plastic and plastic products, and have caused potential hazards on human and animal health. In this study, a highly sensitive method was proposed for trace detection of selected PAEs in water by gas chromatography-mass spectrometry, after solid-phase extraction (SPE) using octyl (C8)-modified magnetic graphene oxide (MGO-C8) as the adsorbent followed by dispersive liquid-liquid microextraction (DLLME). The prepared MGO-C8 was characterized by Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analysis (TGA) and vibrating sample magnetometry (VSM). The recoveries of the PAEs using MGO-C8 as the adsorbent were found to be significantly higher those obtained by MGO. The influences of solution pH, adsorption and desorption time, eluent and extractant, and salt addition on the extraction efficiency of PAEs were investigated. Under the optimized conditions, limits of detection (LODs) of 0.5–1.0 ng L −1 for PAEs, and related standard deviations (RSDs) of 4.8–7.5% were obtained. The proposed method was utilized in the detection of trace PAEs in real environmental water samples, with spiked recoveries of 89.5–112.3%, 91.5–105.0% and 98.0–110.0% for DBP, DEHP and DNOP, respectively.
研究领域:
环境科学
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分析化学
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shumin Qin,Bixiang Nie,Fu Wei,Yan Lin,Lang Jiang,Qian Zhang
The symbiotic system of heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria and Chlorella shows significant nitrogen and phosphorus removal in biogas slurry treatment. It uses quorum sensing signaling molecules to form symbiotic biofilms, significantly boosting nitrogen and phosphorus removal efficiency. This study systematically explored the effect of exogenous N-octanoyl-DL-homoserine lactone (C8-HSL) concentrations on pollutant removal efficiency, extracellular polymeric substance (EPS) production, and microbial dynamics in the HN-AD bacteria- Chlorella symbiotic system. Results showed that the pollutant removal of the symbiotic system is maximized when the C8-HSL concentration is 0.8 μM. At concentrations below 0.8 μM, the system significantly enhances pollutant removal through increased EPS secretion. However, when the concentration exceeds 0.8 μM, both EPS production and pollutant removal are inhibited. Metagenomic analysis shows that C8-HSL at 0.8 μM can enrich key bacterial genera such as Halomonas and Sphingobium . By regulating key genes like narGHI , nirKS , phnX , and ppa , it adjusts their metabolic pathways, thereby influencing nitrogen and phosphorus removal. This highlights the crucial role of C8-HSL concentration in pollutant removal within HN-AD- Chlorella symbiotic systems.
研究领域:
环境微生物学
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水处理技术
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生物修复
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分子生态学
·
环境工程
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微藻生物技术
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信号分子调控
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高影响因子
AICHE JOURNAL
·
2021
·Vol. 68
·期 4
·e17556
·
IF 3.993
Zhihong Ma,Jialei Sha,Weizhong Zheng,Weizhen Sun,Ling Zhao
To enhance the catalytic performance of H 2 SO 4 -catalyzed alkylation, various catalytic additives have drawn considerable attentions. Herein, the effects of deep eutectic solvent (DES) additives on catalytic performance and the interfacial properties of H 2 SO 4 alkylation were systematically investigated using experimental methods and molecular dynamics (MD) simulation. Experimental results indicate that DESs with the optimal concentration about 1.0 wt% can efficiently improve C 8 selectivity and research octane number of alkylate, especially at low temperature, but contribute less to the lifetime of H 2 SO 4 . MD results reveal that the phenyl molecules of DESs additives play a major role in enhancing interfacial properties of H 2 SO 4 alkylation, including enlargement of interfacial thickness, promotion of isobutane relative solubility and diffusion to butene, which is probably the main reason for the better quality of alkylate. This work gives a good guideline for the design of novel DESs for H 2 SO 4 alkylation.
研究领域:
化学工程
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催化
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材料科学
·
计算化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Zhipeng Wang,Songdong Ding,Xiaoyang Hu,Shimeng Li,Dongping Su,Lirong Zhang,Ying Liu,Yongdong Jin
A novel water-soluble ligand of N,N,N‴,N‴ -tetraethyl- N ′ ,N ″-ethidene bisdiglycolamide (TEE-BisDGA) was synthesized and used as a masking agent for selective extraction of Am(III) over Eu(III) from HNO 3 solution by N,N,N ′, N ′ ,N ″ ,N ″-hexaoctylnitrilotriacetamide (NTAamide(C8)) in kerosene. Influences of acidity, concentration of water-soluble ligands and extractant as well as nitrate ions on the distribution ratios ( D ) and separation factors ( SF ) of Am(III) and Eu(III) were investigated. In the range of examined acidity from 0.001 to 0.2 mol/L, D Am and D Eu decreased with the increase of HNO 3 concentration. Using 0.1 mol/L NTAamide(C8) as an extractant, the maximum SF Am/Eu of 26 can be obtained in the presence of 0.01 mol/L TEE-BisDGA in aqueous phase with pH of 3.0, which was significantly higher than that case with no TEE-BisDGA. Job's method and mole ratio method were employed for extraction mechanism research. It has been shown that Am(III) and Eu(III) formed di-solvated species with TEE-BisDGA and mono-solvated species with NTAamide(C8), respectively. Moreover, the stability constants logβ values were obtained from UV–vis adsorption spectroscopic titration for Nd(III) complexes with TEE-BisDGA and N,N,N ′ ,N ′-tetraethyldiglycolamide (TEDGA), which indicated that TEDGA had a stronger complex ability than TEE-BisDGA.
研究领域:
化学
·
环境科学
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高影响因子
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