FOOD CHEMISTRY
·
2024
·
IF 8.5
Zhilong Hao,Jinyuan Wang,Jiayun Zhuang,Xinyu Feng,Helin Lv,Jiao Feng,Shuping Ye,Weisu Tian,Guanjun Pan,Ping Chen,Hongzheng Lin,Qiang Chu
Shaking, essential in oolong tea production, is becoming an innovative method to impart floral fragrance. Research on shaking primarily concentrates on biological underpinnings, including modifications in gene expression and stress-triggered enzymatic catalysis, and consequent physicochemical properties. Water phase and distribution, reshaped by shaking and affected the biological and physicochemical alterations of tea leaves, is always ignored. This work utilized TEM, LF-NMR, UPLC-QqQ-MS, and GC-TOF-MS to explore physicochemical alterations during shaking. Results revealed shaking induced stomatal opening, water migration from stems to leaf veins, and a reduction in free water, transformed into bound water. Mechanical stimulation disrupted cell microstructures, including vacuoles, chloroplasts, and cell walls, releasing precursors and enzyme substrates. Shaking triggered intracellular physicochemical reactions that decreased polyphenols, amino acids, chlorophyll, and carotenoids, while increasing organic acids and sugars. Also catalyzed the synthesis of aromatic compounds like ( E )-nerolidol, β -ionone epoxide, and α -farnesene, shaping the floral-fruity aroma and mellow taste of tea.
研究领域:
植物学
·
食品科学
·
茶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2021
·
IF 7.147
Jin-Long Cui,Li-Wei Cheng,Jing-Yu Kan,Wei-Xin Pang,Jun-Nan Gu,Kun Li,Ling-Ban Wang,Chang-Yu Sun,Xiao-Hui Wang,Guang-Jin Chen,Xing-Xun Li
The spatial difference of hydrate dissociation by depressurization was investigated in an L-shape hydrate simulator to enhance the exploitation efficiency of natural gas hydrates . Hydrates were found to dissociate slower near the mining well than far from the mining well due to the higher water saturation. The mass transfer rate of methane molecules in the water phase was much slower than that in the gas phase. In both vertical and horizontal directions, pore water migrated from the location far from the mining well to that near the mining well in the hydrate reservoir under the pressure difference. This led to a lower dissociation rate for the hydrate distributed at the location near the mining well, which was different from the results in gas/petroleum reservoirs and numerical simulations. The spatial difference was more pronounced in the vertical direction than in the horizontal direction. Gravity caused more water migration in the vertical direction, which led to more uneven dissociation of the hydrates. Sediments with higher permeability and lower mining pressure could result in more pronounced spatial differences. These findings can provide deep insights into the spatial evolution of multiple fields during the exploitation of natural gas hydrates .
研究领域:
地质学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2023
·Vol. 88
·期 4
·1253-1267
·
IF 3.9
Cikun Liu,Ruonan Feng,Jun Li,Zhongliang Hu,Yanshun Xu,Wenshui Xia,Qixing Jiang
The freeze-thawing (FT) stability generally correlates well with the economic value and acceptability of frozen surimi-based products. However, quality changes of emulsified surimi gels under FT conditions are still unclear. Therefore, the gel properties of samples with different phase states of lipids (lard, lard + soybean oil, and soybean oil) were investigated at FT conditions. Results showed that the soybean oil evidently improved the rheological behaviors of sols/gels compared to the lard group. The moisture content of samples with different lipids decreased by 2.40%–2.71% after 4 FT cycles. With increasing FT cycles, the water-holding capacity decreased accompanied by the increase of cooking loss. Spin–spin relaxation spectra and hydrogen proton density images proved the occurrence of water migration of gels during these processes. Better gel integrity was observed in samples consisting of soybean oil, where the proportion of pores was lower than those with lard regardless of FT treatments. Additionally, the intermolecular forces of gels also changed under FT treatments. There results suggested that the lipids with different phase states affected the migration and loss of water in emulsified surimi gels under FT cycles. Practical Application The quality changes of heating-induced surimi gel products under frozen storage have been ignored, especially the emulsified surimi gels. This study discloses the changes of the gel properties in emulsified gel products with different phase states of lipids after FT treatments, which provides critical insights into the quality improvement of this novel emulsified surimi product during processing, storage, and transportation.
研究领域:
食品科学
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xinmei Ma,Wenjing Lu,Yong Lin,Sen Yang,Guizhong Zhou,Ming Tan,Yang Zhang
Organic permeation through an ion exchange membrane is an urgent problem to be solved in electrodialysis (ED) processes on treating industrial wastewaters. However, how the salt, water, and organic compounds co-transport in an ED stack is still unclear. To reveal this, a series of cation exchange membranes (CEMs) were prepared in this work by using sulfonated polysulfone with different sulfonation degrees as a tool to “adjust” membrane water uptake and “control” water migration. The results showed that CEMs with a high sulfonation degree had positive correlation with desalination performance. Salt migration led to organic matter migration, while the presence of small molecule organics reduced the water flux and elevated the sodium flux, which favored the ED process. It was proven that the membrane sulfonation degree could be an important tool to adjust water permeation, and as a consequence, to improve the separation performance of salt from organic compounds in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Minghui Jiang,Xiao Liu,Shiyu Li,Yurui Xu,Simai Wang,Lei Lu,Xinxin Li,Xinru Sun,Chunlei Xia,Ziming Wang,Suping Cui
The internal water migration within calcium silicate hydrate (C-S-H) in dry environments is considered to be the primary factor affecting the volume stability of cementitious materials. In this research, the in-situ polymerization product of plant polyphenol tannic acid (TA) was applied to modify C-S-H based on an organic-inorganic composite modification method. The chemical structure, microstructure, composition, dimensional changes and water migration characteristics of modified C-S-H were analyzed. Experimental results showed that TA improved the polymerization degree of siloxane chains in the C-S-H nanostructure, with a maximum improvement of 80.70%, and increased the interlayer spacing in the C-S-H structure, confirming the modification of C-S-H at the nanoscale, exhibited by 29 Si Nuclear Magnetic Resonance (NMR), X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). This modification by TA optimized the C-S-H nanostructure and microscopic pores, and increased the interlayer and gel pore water content, especially gel pore water increased by 56.53% compared to that of the unmodified C-S-H, revealed by nitrogen adsorption and 1 H LF-NMR. In the dry environment, the blocking and cladding effects of TA on C-S-H effectively inhibited the gel water loss and reduced the drying shrinkage, especially at low TA concentration. This research aims to improve the volume stability of C-S-H by in-situ polymerization product of plant polyphenol, which provides new insights into improving the volume stability of cementitious materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2022
·Vol. 87
·期 9
·3953-3964
·
IF 3.693
Yuan Li,Cijian Li,Meiyu Chen,Zunying Liu,Mingyong Zeng,Yaqin Hu
Sous-vide cooking is a highly praised method used to cook muscle foods because of its desired effect of providing better sensory properties by maintaining texture. In this study, we further explored the effect of water on texture by revealing the mechanisms of moisture migration. Low field nuclear magnetic resonance (LF-NMR) showed that the nonflowing water in sous-vide cooking hairtail was 2.36 ± 0.33% higher than that in traditional cooking. Magnetic resonance imaging (MRI) was used to clarify the law of moisture migration induced by temperature, and the moisture migration of the sous-vide cooking hairtail was slower during the holding heating stage. The microstructure explained the change rules of the texture. The degree of change was consistent with the moisture migration level. Digitalizing analysis quantitatively verified the effect of sous-vide cooking on the hairtail microstructure. The low moisture migration rate of sous-vide cooking resulted in a less damaged microstructure of the hairtail, manifesting as a desirable texture. Practical Application LF-NMR and MRI showed that sous-vide hairtails exhibited a lower moisture migration rate. The holding heating stage only slightly changed the microstructure of the hairtail. The digitalizing analysis confirmed the moisture migration mechanisms. Heat-induced protein denaturation was closely related to the water state.
研究领域:
食品科学
·
生物物理学
✓ 已验证
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Jing Qiao,Chunsheng Zhou,Jingjing Feng,Miao Miao,Yanliang Ji,Linan Gu
Limestone powder (LS) with large particle sizes is widely used, but its effect on water migration behavior remains unclear. This study investigates the influence of LS and viscosity-enhancing admixtures (VEAs) on the water migration behavior and water distribution in fresh cement paste using 1 H low-field nuclear magnetic resonance (LF-NMR). Results indicate that LS increases the size of water migration channels, accelerates the water migration rate, and raises the bleeding ratio, while VEAs substantially mitigate the effects of LS. Compared to polyacrylamide, cellulose ether significantly slows down the water migration rate before 40 min, thereby reducing the bleeding ratio. Additionally, relaxation times were found to decrease during bleeding and can reflect the sedimentation process. It is confirmed that the pore structure of fresh paste exhibits fractal characteristics, with the fractal dimension closely correlating with water migration rates. The underlying mechanisms and their implications on material behavior are thoroughly analyzed and discussed.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Shuaijun Yu,Yazhen Jiang,Geting Xu,Hongyu Liu,Edison Huixiang Ang,Junbin Liao,Jiangnan Shen
In the context of industrial effluent management, the application of electrodialysis (ED) for the recovery of sulfuric acid has attracted significant interest. Despite the technological promise, the employment of traditional anion exchange membranes (AEMs) is frequently marred by substantial proton leakage, a pervasive issue that markedly degrades the effectiveness of acid recovery. To address this challenge, we embarked on a novel approach utilizing a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) substrate. This innovative method harnessed the inherent properties of fluorine-containing groups within PVDF-HFP to provide robust acid stability, while incorporating tertiary amine groups to minimize water uptake resulted in the creation of a proton-blocking AEM. A distinguishing feature of this AEM is its thermally cross-linked diene structure, which not only preserves acid concentration properties but also considerably reduces water migration. Moreover, our investigation undertakes an exhaustive examination of the recycling concentration and water transport within the acid recovery framework, alongside the intricate interplay with energy expenditure. This investigation could facilitate the adoption of industrial acid recovery methods utilizing AEMs designed for minimal water uptake and enhanced acid-blocking capabilities.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1238-1245
·
IF 8.897
Fu Qiang,Li Xiaojuan,Ma Ning,Shi Dier,Chen Pohua,Sun Junliang
Capturing solar energy as heat for water treatment has become a substantial approach to obtain freshwater. To obtain higher performance, the understanding of the mechanism of how water molecules interact with the interface is particularly fundamental, because the migration process of water molecules on the evaporation interface will directly affect the performance of the device. Herein we regulate the number of hydroxyl groups on the surface of reduced graphene oxide quantitatively, to study the effect of different wettability of interfaces on the performance of solar water generators. The water evaporation performance displays a volcanic shape as increasing wettability. Calculated by the computational chemistry method, deviation from proper wetting humidity is not conducive to the migration of water molecules from the surface. The double-edged sword effect of wettability on performances is clarified, and the surface energy density is the key to break through the limit by the finite element method.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiaoqi Liu,Huamin Zhang,Yinqi Duan,Zhizhang Yuan,Xianfeng Li
Alkaline zinc–iron flow batteries (AZIFBs) are a very promising candidate for electrochemical energy storage. The electrolyte plays an important role in determining the energy density and reliability of a battery. The substantial water migration through a membrane during cycling is one of the critical issues that affect the reliability and performance of an AZIFB. In this work, it has been proven that the reason for water migration in AZIFBs is the synergetic effect of concentration gradient, different ionic strengths of negolyte and posolyte, and the electric field. To address the issue of water migration in AZIFBs, a series of additives are employed and the effects of additives on the water transfer behavior and electrochemical performance of AZIFBs are investigated in detail. The results indicate that all investigated additives can suppress water migration through a polybenzimidazole membrane because of the shrunken gap of osmotic pressure and ionic strength between negolyte and posolyte. Moreover, organic additives such as glucose can decrease battery performance because of the increased polarizability of the electrode, whereas inorganic additives such as Na2SO4 demonstrate no distinct effect on battery performance. Specifically, an AZIFB that employs Na2SO4 as an additive in the negative electrolyte can afford a Coulombic efficiency of ∼99% and a voltage efficiency of ∼88% for 120 cycles at 80 mA cm–2, together with a good effect for inhibiting water migration behavior. This paper presents an effective way to suppress water migration and increase the reliability of AZIFBs.
研究领域:
能源存储技术
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2024
·Vol. 11
·期 6
·2568-2576
·
IF 5.8
Jiameng Liu,Tianchi Cao,Lin Duan,Shengkai Xu,Min Li,Tong Zhang,Wei Chen
Nanoparticulates released from surface soils may significantly affect contaminant fate and transport. Here, we show that nanoscale soil particles can markedly enhance the transport of BDE-209 (one of the most commonly detected polybromodiphenyl ethers (PBDEs) in the environment) in groundwater. Specifically, BDE-209 that is initially associated with three types of soil nanoparticles—including nanoparticles extracted from black soil (Mollisol), purple soil (Inceptisol), and loess soil (Entisol)—remains bound to the nanoparticles when migrating through saturated porous media, regardless of the types of surface coating and heterogeneity (i.e., quartz sand, humic-acid-coated sand, and goethite-coated sand). Accordingly, the mobility of BDE-209 is determined by the mobility of the soil nanoparticles. The nanoparticles of black soils have the highest mobility, whereas those of loess soil display the lowest mobility, because the presence of calcite enhances the deposition of the nanoparticles due to increased particle aggregation and ripening. The coating of humic acid on quartz sand enhances the mobility of all three soil nanoparticles (and therefore, BDE-209) due to increased electrostatic repulsion, steric hindrance, and the blocking of deposition sites, while the coating of goethite subdues the mobility due to decreased electrostatic repulsion and deposition in the primary minimum (i.e., positively charged surface heterogeneity). Findings in this study highlight the important roles of soil nanoparticles in mediating contaminant behaviors and point to the potential risks of PBDE spreading in groundwater, even though the common wisdom is that these chemicals are highly immobile and PBDE contamination is restricted to surface soils.
研究领域:
环境科学
·
污染生态学
·
水文学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Kaiqi Yan,Xiangwei Liu,Jiawei Liu,Chong He,Jian Li,Quan Bai
A high-throughput sample pre-treatment method combined with high-performance liquid chromatography (HPLC) was developed to analyze phthalates (PAEs) in food and food contact package samples. Thin film microextraction (TFME) in 96-blade format was used to pre-treat 96 samples simultaneously. Octadecyl groups functionalized fibrous mesoporous silica nanospheres, namely C18-FMSNs, were synthesized and used as TFME coating material. The coating was fabricated by spraying a slurry of C18-FMSNs and polyacrylontrile (PAN) mixture with a commercial portable spraypen. The prepared C18-FMSNs/PAN coatings exhibited good reproducibility, repeatability and reusability. The optimized TFME conditions for PAEs consisted of extraction at pH 4.0 for 50 min, and desorption by methanol/acetonitrile (25/75, V/V) for 40 min. The pretreatment time for each sample was approximately 1.3 min. This TFME-HPLC method showed good linearity for eight PAEs within the concentration range of 0.5–1000 ng mL −1 , with the coefficients higher than 0.9972. The limits of detection and quantification were 0.096–0.26 ng mL −1 and 0.32–0.86 ng mL −1 , respectively. The intra-day and inter-day RSD % were below 6.6 % and 8.4 %, respectively, indicating good precision. The PAEs analysis in real samples showed that dibutyl phthalate (DBP) of 2.3 ± 0.3 ng mL −1 and di-(2-ethylhexyl) phthalate (DEHP) of 5.5 ± 0.8 ng mL −1 in boxed milk, dimethyl phthalate (DMP) of 12.6 ± 0.8 ng mL −1 , DBP of 3.2 ± 0.4 ng mL −1 and DEHP of 14.3 ± 0.7 ng mL −1 in the simulated water migration of plastic box, as well as DMP of 19.0 ± 0.6 ng mL −1 , DBP of 25.6 ± 0.9 ng mL −1 and DEHP of 49.5 ± 2.8 ng mL −1 in the simulated ethanol migration of plastic box were determined, respectively. In addition, the detection of PAEs in all the real samples showed good recovery ranging from 85.6 to 110 % and lower RSDs % (<7.2 %).
研究领域:
分析化学
·
食品科学
·
材料科学
·
环境科学
✓ 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）