Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Le Gou,Zhentao Ping,Liyi Dai,Yuanyuan Wang
Organic acids are commonly used additives in the hydrothermal carbonization (HTC) of sewage sludge (SS). Previous studies have demonstrated that organic acids can effectively increase the carbon content of hydrochar, reduce its nitrogen content, and improve its combustion performance. Due to significant differences in molecular structure and chemical reactivity among organic acids with varying carbon chain lengths, they may exert distinct influences on hydrochar yield, carbon content, and combustion behavior. However, there remains a lack of systematic research on the effects of organic acids with varying carbon chain lengths during the HTC process. In this study, an orthogonal experimental design was employed to investigate the influence of C1 to C9 organic acids on the carbon content of hydrochar under various temperatures (170–230 °C) and concentrations (0.1–0.5 mol/L). The results showed that as the carbon chain length increased, organic acids were more likely to incorporate into the hydrochar structure through chemical reactions, resulting in a gradual increase in both carbon content and calorific value. Furthermore, the addition of long-chain organic acids led to a reduction in nitrogen content and enhancement of the combustion characteristics of the hydrochar. Meanwhile, long-chain organic acids were also beneficial for the recovery of nutrients from the aqueous phase. These findings provide a systematic reference for improving hydrochar quality and promoting aqueous phase resource recovery in the HTC of SS using organic acids.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Shuwei Wang,Tianyu Dong,Ruijia Liu,Jie Sun,Haitao Chen
Pork is one of the meats widely consumed all over the world, while stewing is preferred because it can retain the nutritional content of the meat. After stewing, pork still retains some odors, such as bloody aroma, which affects the flavor quality. Therefore, people often add spices during the stewing process to reduce the off-flavor, but the mechanism of the effect of spices on the off-flavor has not been clarified. This study examined the pork broth before and after the addition of spices and determined the off-flavor compounds ( (E) -2-nonenal, (E) -2-heptenal, acetic acid, and valeric acid) in pork broth and key spice compounds (linalool, 1,8-cineole, and (E) -anethole) in pork broth with spices. The mechanism of the influence of spices on the off-flavor compounds of pork broth was clarified through the sensory perceptual interaction between off-flavor compounds and key spice compounds. The S-curve method was used to analyze the perceptual interactions between off-flavor compounds and key spice compounds. The results showed that linalool, 1,8-cineole, and (E) -anethole all had a masking effect on the aroma of off-flavor compounds (S-curve ratios = 1.58, 2.21, and 5.84, respectively), and the inhibitory effect was strongest when the three compounds acted together (S-curve ratio = 42.49).
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AICHE JOURNAL
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2025
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IF 4
Qinghua Liu,Guoxuan Li,Chengmin Gui,Minghao Song,Fei Zhao,Shengchao Yang,Zhigang Lei,Pan Xu
Deep eutectic solvents (DESs) were regarded as promising absorbents in many absorption processes. Here, we use randomly methylated β -cyclodextrin (RAMEB) to further improve the absorption capacity of DESs for aromatic VOCs. We found benzene and toluene vapor pressures obviously decreased after adding 2% RAMEB (molar fraction) to DESs. Dynamic absorption experiments also confirmed this enhancement effect; the dynamic absorption efficiency for benzene and toluene increased by 6.12% and 9.23%, respectively, at a 5 mL/min solvent rate. Water was used to reduce the viscosity of DESs; the humidity and regeneration stability were evaluated experimentally. At the molecular level, the strong host–guest interactions between RAMEB and aromatic VOCs were identified as the main reason for improving the absorption capacity of DESs. Additionally, the roles of hydrogen bond donor and acceptor molecules were analyzed. π–π stacking and CH–π interactions were also identified as significant contributors to the aromatic VOCs absorption process.
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ULTRASONICS SONOCHEMISTRY
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2025
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IF 9.7
Yuhan Fang,Ping Zhang,Shuang Wang,Lulu Li,Zunlai Sheng
This study innovatively employs ultrasound-assisted extraction (UAE) in conjunction with supramolecular solvents (SUPRAS) for the extraction of luteolin from peanut shells, while also investigating the potential mechanism underlying this extraction process. Initially, the formation mechanism of SUPRAS was characterized using Fourier-transform infrared spectroscopy (FTIR). Based on the results of single-factor experiments, the extraction process was optimized using response surface methodology (RSM), resulting in the determination of optimal conditions: an ultrasound temperature of 67 °C, a SUPRAS/equilibrium solution (EqS) volume ratio of 5:1, and a solid-to-liquid ratio of 1:36 g/mL. Under these conditions, the maximum luteolin yield reached 1.645 mg/g. Furthermore, through independent gradient model (IGMH) calculations, molecular orbital theory, interaction energy analysis, and molecular dynamics simulations, it was revealed that the predominant interaction force between the supramolecular solvent and the target compound is hydrogen bonding. Notably, this study also compares the SUPRAS-UAE extraction method with the traditional extraction in terms of efficiency, economic costs, and environmental impact. The results indicate that the SUPRAS-UAE technique demonstrates significant advantages in terms of its green and high-efficiency characteristics. It provides a new sustainable strategy for the efficient recovery of natural active ingredients in chemical engineering and related fields.
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JOURNAL OF SEPARATION SCIENCE
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2020
·Vol. 43
·期 15
·3129-3135
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IF 2.878
Xin Di,Xiaojun Zhao,Xiaoli Guo
A green extractant, hydrophobic deep eutectic solvent was first introduced for extraction of tetracycline, oxytetracycline, and chlortetracycline from environmental water samples prior to high-performance liquid chromatography determination. Deep eutectic solvents consist of methyltrioctylammonium chloride and various medium-chain alcohols/acids, and are easy in preparation, low cost and toxicity, desirably biodegradable, and biocompatible. The overall time required for sample preparation was 6 min and the volume of organic solvent used for extraction was only 400 µL. Under the optimized extraction condition, the present method yielded low limit of detection (0.5–2.0 ng/mL), acceptable precision (relative standard deviations < 9.7%), good linearity from 2.0 to 500 ng/mL ( r 2 ≥ 0.9991). This optimized procedure was applied for determination of tetracyclines in different water samples with desirable spiked recovery ranged from 77.5 to 87.6%. There is, therefore, a great potential to further expand application of the method for investigation of other ultra-trace analyte(s) in environmental matrixes.
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ACS Earth and Space Chemistry
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2025
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IF 2.9
Yaru Song,Minglan Xu,Jianlong Li,Narcisse Tsona Tchinda,Kun Li,Lin Du
Atmospheric release of nuclear wastewater results in the introduction of radionuclides into seawater. These radionuclides can be transported back to the atmosphere by interacting with organic matter at the surface of marine aerosol. Organic molecules, such as organic acids (OAs) and alcohols, the primary components of the organic coating on marine aerosol, play a crucial role in this process. However, the discriminated mechanisms of the interactions of these OAs and organic alcohols at the marine aerosol surface urgently need to be explored. This study uses a Langmuir trough to mimic the marine aerosol surface and investigates the interactions of several OAs (formic acid, hexanoic acid, heptanoic acid, octanoic acid, and nonanoic acid) and dodecanol at seawater-relevant ratios. It was found that upon their addition, metal ions (Ba2+, Co2+, Mn2+, Cs+, Sb3+, Sr2+, Rh3+, Ru3+, and La3+) acting as proxies of radionuclides effectively interacted with the carboxyl headgroups of OAs, which was manifested as a significant increase in the carboxylate asymmetric stretch. This asymmetric stretching vibration is significantly increased with the metal ion concentration and enrichment. Furthermore, the apparent surface binding affinity of metal ions with hexanoic acid is significantly higher than that with nonanoic acid, by a factor of ∼1.95. These findings are significant for understanding how metal ion enrichment at the air-sea interface influences the behavior and fate of radionuclides in the marine atmosphere. Additionally, this study provides new insights into the complex interactions between organic compounds and metal ions, offering valuable perspectives and methodologies for advancing research in marine chemistry and environmental science.
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Food Chemistry-X
·
2025
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IF 8.2
Zhuyu Yang,Zefan Chen,Weijia Zhang,Jinlin Wang,Fan Bai,Ruichang Gao,Yujin Li,Jian Li,Yuanhui Zhao,Xinxing Xu
This is the first comprehensive comparison of key odorants and sensory properties of various caviar with different breeding environments, processing conditions, and grades of quality. Ten aroma attributes were identified and rated by sensory descriptive analysis. 47 and 50 volatile compounds were identified by two aroma extraction methods (SPME, SAFE) combined with GC–MS, respectively. 27 potential key aroma-active compounds were quantitated and further screening through AEDA and OAV calculation. Finally, 21 key aroma active compounds (OAV > 1, FD ≥ 9) were screened, including butanal, hexanal, ( Z )-4-heptenal, ( Z )-2-penten-1-ol, 2-nonanone, nonanal, 1-octen-3-ol, 2-ethyl-1-hexanol, benzaldehyde, acetic acid and other compounds. Recombination and omission tests verified that these compounds played an important role in the overall aroma profile of different caviar samples. The different contribution of key volatile aroma compounds to the overall aroma system of caviar resulted in the difference of caviar flavor quality.
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ULTRASONICS SONOCHEMISTRY
·
2025
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IF 9.7
Han Yuan,Xiangzhou Li,Jun Zhou,Yanhong Yang,Wensheng Li,Peng Zhou
To address potential issues such as low efficiency, prolonged processing time, the environmental friendliness deficiency of traditional extraction processes of ginkgo flavonol glycosides, this study adopted an ultrasonic-assisted extraction of Ginkgo Flavonol Glycosides with natural deep eutectic solvent-based supramolecular solvent/equilibrium solution (NADES-SUPRAS/EqS). With the assistance of ultrasound, this method achieved an efficient and green extraction process, especially demonstrating significant advantages in reducing extraction time. Through experimental optimization, the optimal conditions were determined as follows: ultrasonic power 160 W, treatment duration 15 min, solid-to-liquid ratio 40 mg/mL, and extraction temperature 30 ℃. Under these conditions, the yield of Ginkgo Flavonol Glycosides reached 8.025 mg/g. Recovery experiments confirmed excellent recyclability of the NADES-SUPRAS/EqS solvent, achieving a flavonol glycoside recovery rate of 91.3 %. This approach holds significant potential for industrial-scale production of Ginkgo Flavonol Glycosides. Microstructural analysis revealed that the NADES-SUPRAS/EqS solvent formed normal micellar vesicles with a hydrophobic core and hydrophilic corona, and the combination of ultrasonic action could effectively disrupt the cell walls of Ginkgo leaves. Density functional theory (DFT)-based molecular modeling elucidated the extraction mechanism, demonstrating strong hydrogen bonding and van der Waals interactions between the NADES-SUPRAS/EqS solvent and rutin. The significance of this research lies in offering a reference framework for green and efficient ultrasonic-assisted extraction studies of natural bioactive compounds, which may provide a feasible technical solution for production of ginkgo flavonol glycosides.
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Food Bioscience
·
2025
·
IF 5.9
Xiaoqian Liu,Fang Yuan,Bei Zhou,Wen Huang,Zhinan Mei,Salam A. Ibrahim,Ying Liu,Xi Feng
Gastrodia elata Blume is a nutritious ingredient with high edible value. However, its distinctive odor, "horse urine-like off-odor", has limited its applications. The potential unpleasant odorants presenting a horse urine-like off-odor in G . elata was investigated by GC-MS-O. Two G. elata samples, one cultivated in Yichang (YC, with horse urine-like off-odor) and the other one cultivated in Yingshan (YS, without off-odor), were used for chemical analysis and sensory evaluation. The identification of compounds responsible for the odor differences between YC and YS provided the basis for determining key odorants that contribute to horse urine-like off-odor. In the GC-O analysis, 37 aroma compounds were identified in YC while 32 in YS. Aroma recombination and omission tests proved that ten compounds (including pentanal, benzeneacetic acid, benzaldehyde, 2,3-butanedione, acetoin, acetic acid, hexanoic acid, p-cresol, m-cresol, and 2-methoxy-4-vinylphenol) were the main contributors to the horse urine-like off-odor. The pathways of off-odor formation in G . elata were elucidated. Our results provide insights into the formation of horse urine-like off-odor in G . elata .
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Fuhui Luo,Zhongqiao Zhao,Yong He,Fenfen Zeng,Xia Yang,Fengxiang Zhang,Wei Shi
To enhance polyphenol extraction efficiency and enable rapid solvent separation, an innovative and eco-friendly extraction method using a switchable deep eutectic solvent based on alkaline/acidic electrolyzed water (AA-SDES) was firstly developed. This study also pioneers the application of a hydrophobic deep eutectic solvent (SDES) system, which consists of nonoic acid (RS) and n-octanoic acid (XS), for extracting polyphenol compounds from Taraxaci Herba (PGY). Optimized using the Newton-Raphson-based optimizer-Support vector regression-Sparrow search algorithm (NRBO-SVR-SSA) algorithm, the AA-SDES system achieved a polyphenol content of 7.74 mg/g, demonstrating an extraction efficiency approximately 1.5 times higher than the traditional acid-base method (NH-SDES) and 2.7 times higher than conventional methanol extraction. Over five consecutive cycles, the AA-SDES system demonstrated robust polyphenol extraction efficiency (92.9 %). The enhanced characterization of SDES-7 revealed that RS acts as a hydrogen bond donor (HBD) and XS acts as a hydrogen bond acceptor (HBA), mainly mediated by hydrogen bonding. The switching mechanism of SDES further confirms its effective switching properties. Additionally, the extraction mechanism demonstrates that AA-SDES exhibits superior cell wall disruption capabilities compared to NH-SDES and methanol. Notably, AA-SDES increases intermolecular hydrogen bonds (HB) and promotes van der Waals interactions between AA-SDES and active components. Furthermore, the HB formed with the target components provide a protective effect, contributing to the overall efficiency of the extraction process. The green sustainability of the method was validated using established assessment tools (AGREE/Complex GAPI). Overall, as one of the most environmentally friendly pH-responsive solvents, it demonstrates broad application prospects.
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ANALYTICAL CHEMISTRY
·
2025
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IF 6.7
Jian Song,Hai-Long Qian,Shu-Ting Xu,Cheng Yang,Xiu-Ping Yan
Efficient extraction of perfluoroalkyl and polyfluoroalkyl substances (PFAS) poses a significant challenge for water treatment and food safety. Here, we report a multifunctional covalent organic framework (COF) for the selective and efficient extraction of PFAS. A facile room-temperature imine condensation of two monomers, 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (BTFDA) and 1,3,5-triformylphloroglucinol (Tp), produced a multifunctional COF (TpBTFDA). TpBTFDA was rationally designed to synergistically integrate chemical moieties capable of leveraging both fluorophilic (via trifluoromethyl groups) and hydrogen bonding (via β-ketoenamine linkages) interactions with PFAS molecules. Batch adsorption experiments, coupled with systematic comparative studies against control COFs (lacking either the fluorophilic or hydrogen-bonding sites), revealed that this synergistic interplay is essential for the efficient capture of PFAS, demonstrating that both interaction mechanisms are indispensable. Consequently, the TpBTFDA exhibited exceptionally high adsorption capacities (379–521 mg g–1) for eight PFAS. The fabricated TpBTFDA was applied to develop a selective solid-phase extraction method for UHPLC-MS/MS determination of PFAS. The developed method showed a wide linear range (0.01–200 μg L–1), low detection limits (0.006–0.59 μg L–1), good precision (RSD ≤ 5.2%), and recovery (83.0–112.3%) for the accurate determination of PFAS in real water and food samples. This study underscores the potential of rationally designed COFs for effectively enriching and detecting PFAS in practical applications.
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IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2025
·
IF 3.1
Kaizheng Wang,Hang Ren,Lulu Li,Feipeng Wang,Dihao Lei,Jiran Qin,Zhengdong Zhou,Jian Li
The increasing emphasis on environmental sustainability and efficient resource use drives strong demand for ester-based insulating oils. However, their high production cost limits large-scale application. Low-cost coconut fatty acid distillate (CFAD) is used to synthesize coconut-based trimethylolpropane ester (CTE0). The optimal conditions are 1.2 wt% p-toluenesulfonic acid (TSOH) as the catalyst and a CFAD-to-Trimethylolpropane (TMP) molar ratio of 3.2:1 at 130 °C. CTE0 exhibits a relatively high pour point (–3 °C) and a low fire point (275 °C). To improve its properties, the influence of molecular structures such as branching, carbon–carbon double bonds (C=C), and the odd–even carbon number effect in fatty acid chains on insulating oil properties is investigated. Simulation results indicate that the incorporation of odd-numbered carbon chains and C=C double bonds significantly lowers the pour point due to higher degree of molecular disorder and greater difficulty in forming static packing, while higher molecular weight (MW) enhances the fire point. Therefore, different ratios of nonanoic acid (C9) and oleic acid (C18:1) are added into CFAD to synthesize a high-performance ester insulating oil (CTE3) with pour and fire points of –15 °C and 301 °C, respectively. This study presents a cost-effective synthesis strategy for ester-based insulating oils that reduces production costs by 50–60% compared with commercial natural esters, while also providing key insights into their structure–property relationships.
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危险品化学品经营许可证（带存储）