Journal of Cleaner Production
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2021
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IF 9.297
Zi-Hui Cai,Jian-Dong Wang,Li-Tao Wang,Su Zhang,Xin-Yu Yan,Yan-Qiu Wang,Peng-Quan Zhao,Li-Na Fu,Chun-Jian Zhao,Qing Yang,Dong Meng,Yu-Jie Fu
Green vortex-assisted octanoic acid-ethanol-water supramolecular solvents (OAEW-SUPRAS) were developed for the simultaneous extraction of six phenolics and hydroxy-α-sanshool (HAS) from Zanthoxylum bungeanum Maxim. peels (ZBMP). The formation of OAEW-SUPRAS was composed of reverse micelle droplets with different sizes, which were caused by desolvation and aggregation. OAEW-SUPRAS were characterized by microscopy and fourier transform infrared spectroscopy. OAEW-SUPRAS can quickly extract active ingredients with different polarity and obtain excellent extraction yields (9.62 mg/g for phenolics and 41.08 mg/g for HAS). The proposed method was reliable (determination coefficients >0.99), precise (intra-day precision <5.04% and inter-day precision <7.29%) and accurate. The accuracy of the method ranged from 96.1 to 107.5%. The established secondary kinetic models (R 2 > 0.99) were proved a good fit with the extraction process. Under the optimal conditions, the efficiencies of active ingredients extracted by OAEW-SUPRAS were substantially higher than conventional organic reagents and the OAEW-SUPRAS extracts also showed a high antioxidant capacity (IC 50 = 1.49 mg/mL). Finally, the extraction solvent and target compounds were easily recovered and enriched.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xueting Zhao,Jinshan Sun,Xinhao Cheng,Qingqing Qiu,Guangming Ma,Chunyu Jiang,Jiefeng Pan
Covalent organic frameworks (COFs) with tunable pore sizes and ordered structures are ideal materials for engineering nanofiltration (NF) membranes. However, most of the COFs prepared by solvothermal synthesis are unprocessable powders and fail to form well-structured membranes, which seriously hinders the development of COF NF membranes. Herein, colloidal 2D-COFs with processable membrane formation ability were synthesized by oil-in-water emulsion interfacial polymerization technology. COF NF membranes with tailored thickness and surface charge were fabricated via a layer-by-layer (LBL) assembly strategy. The prepared COF NF membrane achieved precise sieving of dye molecules with high permeance (85 L·m–2·h–1·bar–1). In this work, the strategy of prepared COF NF membranes based on colloid 2D-COF LBL assembly is proposed for the first time, which provides a new idea for the on-demand design and preparation of COF membranes for precise molecular sieving.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Xiaojiao Zheng,Weiwei Ma,Qihui Wang,Yaping Xu,Yukun Yang,Shu Qin,Xu Jing
In this study, a fast, green, and efficient ferrofluid-based dispersive liquid–liquid microextraction (DLLME) method was developed for determining chiral fungicide hexaconazole residues using high-performance liquid chromatography (HPLC). The ferrofluid as extraction solvent was composed of deep eutectic solvents (DESs) and Fe 3 O 4 , in which DES as the functional support solvent of the ferrofluid was synthesized by fenchol, hexanoic acid, and acetic acid in the molar ratio of 1:0.5:3. The prepared ferrofluid is characterized by self-dispersion and magnetism, which can eliminate the vortex, ultrasound, and centrifugation steps. Chiral separation and detection of hexaconazole enantiomers were performed by HPLC. Under optimal conditions, linearity ranged between 0.02 and 2 μg mL −1 , the limit of detection (LOD) was 0.006 μg mL −1 , and relative standard deviations were less than 8.6 %. The recoveries in the water, tea, and juice ranged from 83.0 % to 101.7 %. The proposed self-dispersion ferrofluids can facilitate the development of fast microextraction methods for pesticides in food samples.
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JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 159
·期 21
·
IF 4.4
Li Hui,Zhang Jiachen,Zhang Qun
Prolonging the lifetime of photoinduced hot carriers in lead–halide perovskite quantum dots (QDs) is highly desirable because it can help improve the photovoltaic conversion efficiency. Ligand engineering has recently become a promising strategy to achieve this; nevertheless, mechanistic studies in this field remain limited. Herein, we propose a new scenario of ligand engineering featuring Pb 2+ /Br − site-selective capping on the surface of CsPbBr 3 QDs. Through joint observations of temperature-dependent photoluminescence, ultrafast transient absorption, and Raman spectroscopy of the two contrasting model systems of CsPbBr 3 QDs (i.e., capping with organic ligand only vs hybrid organic/inorganic ligands), we reveal that the phononic regulation of Pb–Br stretching at the Br-site (relative to Pb-site) leads to a larger suppression of charge–phonon coupling due to a stronger polaronic screening effect, thereby more effectively retarding the hot-carrier cooling process. This work opens a new route for the manipulation of hot-carrier cooling dynamics in perovskite systems via site-selective ligand engineering.
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Current Research in Food Science
·
2023
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IF 6.3
Yilin Li,Houyin Wang,Ruotong Li,Guirong Liu,Kui Zhong,Lipeng Gao,Baoqing Zhu,Anwen Jin,Bolin Shi,Lei Zhao,Sisi Wang
This study combined gas chromatography-mass spectrometry (GC-MS) and odor activity value (OAV) assessments to analyze the volatile ingredient changes in formula powder during 11 months of storage at room temperature. Orthogonal partial least squares-discriminant analysis (OPLS-DA) and variable importance in projection (VIP) were also used to assess the potential indicators of aroma changes during storage. The aim was to expose the possible changes in the aroma profile and the substances that alter infant formula (IF) aroma during storage. The results showed that the aldehyde and ketone content in the milk formula increased as the storage time was extended, while the lactone and terpenoid levels decreased significantly. The OAV indicated the presence of various major aromatic substances at different storage times. Considering consumer concern regarding product flavor, this study ascertained that monitoring substance changes during storage showed that 2-heptanone was a good indicator of milk flavor, dimethyl disulfide was a suitable indicator of protein degradation, and 3-methylbutanal, heptanal, hexanal, pentanal, and octanal were all good indicators of fat oxidation. The results of previous related studies were used to supplement the data in this work regarding the changes in IF during product shelf life and to provide support for controlling the flavor substances and quality during new product development.
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MOLECULES
·
2023
·Vol. 28
·期 22
·7634
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IF 4.6
Hongbo Yang,Jin Li,Jianfei Mao,Chan Xu,Jieyu Song,Feng Xie
Ochratoxins, a common class of mycotoxin in capsicum, and techniques and methods for the determination of mycotoxins in spices have been increasingly developed in recent years. An innovative and eco-friendly method of dispersive liquid–liquid microextraction (DLLME) was demonstrated in this study, based on a synthesized deep eutectic solvent (DES) combined with LC-MS/MS, for the quantification and analysis of two ochratoxins in capsicum. The DES-DLLME method parameters entail selecting the DES type (thymol:decanoic acid, molar ratio 1:1) and DES volume (100 μL). The volume of water (3 mL) and salt concentration (0 g) undergo optimization following a step-by-step approach to achieve optimal target substance extraction efficiency. The matrix effect associated with the direct detection of the target substance in capsicum was significantly reduced in this study by the addition of isotopic internal standards corresponding to the target substance. This facilitated optimal conditions wherein quantitative analysis using LC-MS/MS revealed a linear range of 0.50–250.00 µg/mL, with all two curves calibrated with internal standards showing correlation coefficients (r2) greater than 0.9995. The method’s limits of detection (LODs) and limits of quantification (LOQs) fell in the ranges of 0.14–0.45 μg/kg and 0.45–1.45 μg/kg, respectively. The method’s spiked recoveries ranged from 81.97 to 105.17%, indicating its sensitivity and accuracy. The environmental friendliness of the technique was assessed using two green assessment tools, AGREE and complexGAPI, and the results showed that the technique was more in line with the concept of sustainable development compared to other techniques for detecting ochratoxins in capsicum. Overall, this study provides a new approach for the determination of mycotoxins in a complex food matrix such as capsicum and other spices using DES and also contributes to the application of green analytical chemistry methods in the food industry.Keywords:deep eutectic solvent;dispersive liquid–liquid microextraction;ochratoxins;capsicum;green analytical chemistry
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Friction
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2023
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IF 6.8
Wang Hanwen,Wang Ying,Wen Ping,Ma Lin,Fan Mingjin,Dong Rui,Zhang Chunhua
Development of energy-efficient lubricants is a way to reduce energy consumption for transportation, with the tendency to design molecules that are beneficial in reducing the viscosity of synthetic oils. Oligoether esters (OEEs), as a low-viscosity ester base oil, have characteristics such as simple synthesis and excellent lubrication effect, however, the application of OEEs in tribology field has rarely been investigated. The objective of the present study is to investigate the effect of structure on the lubricating performance of OEEs and to develop a predictive model for OEEs based on quantitative structure-property relationship (QSPR) through a combination of experiment and statistical modeling. Results showed that glycol chains contribute positively to lubrication with the ether functional groups increasing the sites of adsorption. Compared to branched-chain OEEs, straight-chain OEEs exhibited reduced wear, which was mainly due to the thicker adsorption film formed by the straight-chain structure. Furthermore, carbon films were detected on lightly worn surfaces, indicating that OEEs underwent oxidation during the friction process. Based on the results of principal component analysis (PCA) and partial least squares (PLS), it could be found that the predictive models of viscosity–temperature performance, thermal stability performance, coefficient of friction (COF), and wear volume (WV) performed well and robustly. Among them, COF and WV can be best predicted with an R 2 of about 0.90.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Jinqiu Yuan,Xinda You,Runnan Zhang,Zengguang Yao,Qingyuan Liu,Li Cao,Shiyu Zhang,Yunshu Li,Ziwen Liu,Zhongyi Jiang,Hong Wu
Developing effective organic solvent nanofiltration (OSN) membranes to separate molecular solutes from organic solvents is highly desired yet requires a suitable material platform and an in-depth investigation of membrane selectivity. Herein, an oriented ionic covalent organic framework membrane ( oi -COM) was fabricated, which features well-ordered channels that are vertically aligned towards the membrane surface and lined with abundant sulfonate groups. Filtration experiments of multifarious organic solvents and solutes with different charges and molecular sizes were conducted. The oi -COM exhibited above 99% rejection for negatively charged dye (Evans blue), much higher than that for positively charged dye with similar molecular size, while maintaining high solvent permeance for ethanol of 63 L m −2 h −1 bar −1 . These results demonstrated the significance of electrostatic repulsion effect in membrane selectivity, providing insights for the design of high-performance OSN membranes.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Na Xing,Xiao Pang,Qingrui Meng,Zhong Gao,Leilang Zhang,Sijia Wang,Ziwen Liu,Yan Kong,Cuiting Ding,Hong Wu,Zhongyi Jiang
Proton exchange membranes (PEMs) are the core components of electrochemical hydrogen energy production, storage and conversion devices. It is a great challenge to develop PEMs with a combination of high proton conductivity, minimal H 2 crossover and mechanical robustness for achieving high efficiency and long-term stability in these devices. Here, a co-assembled PEM composed of ionic covalent organic framework (iCOF) nanosheets and functionalized graphene oxide (GO) nanosheets was presented. The iCOF (TpPa-SO 3 H) nanosheets and polydopamine-modified graphene oxide (DGO) nanosheets were co-assembled into TpPa-SO 3 H/DGO mixed nanosheets with ultrahigh aspect ratio, which were readily further processed into TpPa-SO 3 H/DGO co-assembled membranes. The abundant and uniformly distributed –SO 3 H groups on TpPa-SO 3 H nanosheets and the acid-base pairs formed between TpPa-SO 3 H and DGO nanosheets promoted proton conduction significantly. Additionally, the dense structured DGO nanosheets inhibited H 2 crossover remarkably, and the multiple interactions between TpPa-SO 3 H and DGO nanosheets enhanced mechanical strength . The resultant TpPa-SO 3 H/DGO co-assembled membrane exhibited an ultrahigh proton conductivity of 916.4 mS cm −1 (80 °C, 100% RH), an unprecedently low H 2 crossover of 9.7 barrer and a sufficient tensile stress of 87.8 MPa. The enhanced proton conduction and H 2 barrier property led to enhanced performance in both electrochemical hydrogen compression and single hydrogen fuel cells.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xinmiao Wang,Qian Wang,Dong Cai,Jinghan Yu,Xiaoyang Liu,Fawen Yin,Dayong Zhou
Phenolic esters are considered as promising functional food ingredients. However, their digestion, absorption and metabolism are still unclear. Tyrosol acyl esters (TYr-Es), hydroxytyrosol acyl esters (HTy-Es) and alkyl gallates (A-GAs) were hydrolyzed by carboxylesterase in plasma and exhibited slow release of polyphenols (phenolic acids). In vitro hydrolysis degrees initially increased and then decreased with the increasing carbon chain length (C2-C16). TYr-Es exhibited higher hydrolysis degrees compared to HTy-Es, and hydrolysis degrees of TYr-Es and HTy-Es were markedly higher than those of A-GAs. Due to the fast hydrolysis rates of TYr-Es and HTy-Es, they were undetectable in all rat plasma samples collected at several times within 24 h after administration. Whereas, A-GAs could be detected in rat plasmas and three absorption peaks were found in the pharmacokinetic profiles. Importantly, the T 1/2 , MRT, AUC 0-∞ , AUC 0-t in octyl gallate group were longer (or stronger) than those in propyl gallate and dodecyl gallate groups.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaoyi Pu,Xin Wang,Youping Liu,Xin Di
In this work, a novel deep eutectic solvent composed of thymol and octanol was synthesized and employed as a green extractant for ultrasound-assisted dispersive liquid–liquid microextraction (UA-DLLME) of three quinolones in environmental water followed by HPLC-UV analysis. Parameters affecting UA-DLLME were investigated and optimized. The optimal DES ratio was 2:1, the volume was 150 μL, ultrasonic time was 5 min, and the NaCl concentration was 0.68 mol·L -1 . Good linearity was obtained over the concentration range of 1–100 ng·mL −1 with R 2 ≥ 0.9986. The limits of detection (LOD) were 0.1–0.3 ng·mL −1 and the limits of quantification (LOQ) were 0.4–1.0 ng·mL −1 with RSD less than 4.8%. The method was fast, sensitive and eco-friendly, which offered a new way to monitor quinolone levels in environmental water.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Jiangping Cao,Lei Shi,Yifei He,Tingting Wang,Baizhao Zeng,Faqiong Zhao
An efficient and ecofriendly effervescence-assisted emulsification microextraction approach based on hydrophobic deep eutectic solvent (EA-EME-DES) was developed for the sensitive chromatographic determination of parabens (i.e., methyl-, ethyl-, propyl- and butylparaben) in foodstuffs. The DES extractant consisted of methyltrioctyl ammonium chloride (MTAC) and decanoic acid (DecA) (1:3, mol/mol), and had high hydrophobicity , solubility and stability. During the microextraction procedure, sodium carbonate was introduced to facilitate the dissolution of parabens in aqueous solution, DES dispersion and phase separation by enhancing solution pH and generating CO 2 bubbles. The developed method exhibited satisfactory linearity (R 2 ≥ 0.9986), detection limits (0.01–0.03 μg/g), quantitation limits (0.04–0.09 μg/g), recoveries (87.8% to 111%, with RSDs of 0.8% to 5%) and negligible matrix effects, hence it had remarkable effectiveness and applicability in determining parabens in complex foodstuffs.
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