JOURNAL OF SEPARATION SCIENCE
·
2025
·Vol. 48
·期 4
·e70133
·
IF 2.8
Wenting Li,Lunzhao Yi,Ying Gu,Dabing Ren,Wenjiang Dong
Ripened Pu-erh tea is a special tea with unique flavor and obtained by solid fermentation of microorganisms. This work aimed to investigate the changes of lipid metabolites during fermentation and the association between lipids and the aroma of ripened Pu-erh tea based on ultra-high-performance liquid chromatography-high resolution mass spectrometry and GC-MS. A total of 217 lipids and lipid-soluble substances covering 19 subclasses were detected and characterized. Compared with green tea, black tea, and raw Pu-erh tea, ripened Pu-erh tea showed the highest levels of fatty acids. The contents of 36 lipids varied remarkably with fermentation time, and thus these compounds were screened as differential metabolites. These changes were mainly caused by the degradation of glycerophospholipids (folds change: 0.48–0.13) and the formation of fatty acids (folds change: 5.2–11.2). Results of Pearson correlation analysis showed that a few of the aromatic volatiles, including 2-octenal, 3,5-octadien-2-one, 2,4-heptadienal, and 2,6-nonadienal showed obvious negative correlations with phosphatidylcholine, phosphatidylethanolamine, and phosphatidylinositol, but significant positive correlations with fatty acids 18:2 and 18:1. This study provided a further understanding of the lipid composition of ripened Pu-erh and their changes during tea production.
研究领域:
食品科学
·
代谢组学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Ruijie Yao,Qiqi Feng,Wenxiu Wu,Xiaoxue Xu,Yixuan Zhang,Wei Li,Minfang Chen
Transparent conductive films (TCFs) are becoming increasingly important in the development of efficient and stretchable optoelectronic devices, where the key raw material imparting these excellent properties is silver nanowires (AgNWs). Herein, using copper chloride as a reactive additive, AgNWs with a higher aspect ratio, improved uniformity, and high purity are synthesized. Using the AgNWs as conductive materials and polyurethane (PU) as the transparent substrate, AgNWs-PU TCFs with outstanding optoelectronic properties are prepared using the pumping-filtration transfer method. The TCFs’ sheet resistance is as low as 14.9 Ω sq −1 and still shows good conductivity after 4000 times bending, transmittance at λ = 550 nm is 83%, and the optoelectronic properties remain unchanged until 140 °C, indicating their excellent heat temperature resistance. Furthermore, AgNWs-PU TCFs demonstrate a smaller contact angle, lower surface roughness, and greater uniformity than that of commercial indium tin oxide (ITO), even during the electrodeposition. The deposition of Prussian blue on these substrates evidences these advantageous properties, providing greater possibilities for developing flexible color-changing devices, especially electrochromic glass.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Zhihua Zhao,Yao Wang,Bo Li,Pu Chen,Guixin Jin,Xiaoqing Shen,Zhigang Shao,Lan Wu
With the rapid advancement of wearable technology, multifunctional sensors have garnered significant attention due to their potential applications in environmental monitoring, health diagnostics, and human−machine interaction. Despite their promise, challenges, such as limited flexibility, insufficient sensitivity, and complex production processes, have hindered their practical deployment. This study presents the fabrication of a multifunctional flexible sensor based on PU-supported Ti3C2Tx/TiO2/PPy yarns for both ammonia (NH3) gas sensing and human motion detection. Key innovations include the incorporation of polypyrrole (PPy) into the Ti3C2Tx MXene structure and the optimization of titanium dioxide (TiO2) content through varying hydrothermal times, which significantly enhance the gas sensing performance. The sensor demonstrates exceptional sensitivity and selectivity toward NH3, with a rapid response and recovery times. Additionally, the PU-supported composite yarns exhibit excellent mechanical flexibility and durability, maintaining stable performance under repeated stretching and bending cycles. In human motion detection, the sensor shows high sensitivity and reliable performance in monitoring various physical activities, making it highly suitable for applications in wearable electronics. These features ensure the sensor’s applicability in diverse settings, promoting safety and health in environments with potential ammonia exposure and enhancing human−machine interactions through accurate motion monitoring.
研究领域:
材料科学
·
传感技术
·
环境监测
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiayu Lu,Jinbiao Zhao,Jinling Liu,Kai Yu,Yan Zhang,Bibo Wang,Junling Wang,Zhien Zheng,Dongming Qi,Wei Wang
Asymmetric double-conductive network bionic microfiber leather has been prepared. • Achieves outstanding absorption-dominant EMI SE (A > 0.9) at only 1.18 mm thickness. • Microfiber leather combines EMI shielding performance and sensing performance. Interior biocompatibility and electromagnetic interference (EMI) have become critical concerns in the design of advanced robotic electronic skins, creating an urgent demand for flexible, durable materials that eliminate solvent residues while providing integrated shielding and sensing functions. This study presents a breakthrough in solvent-free polyurethane (SFPU) microfiber-based skin by architecting asymmetric dual-conductive networks that mimic the hierarchical structure of natural tissue, achieving excellent absorption-dominated EMI shielding performance in the X-band and Ku-band along with reliable sensing capability. In detail, a highly conductive silver nanowires (AgNWs) layer is constructed on the microfiber fabric, serving as the primary electromagnetic reflection layer. Subsequently, an SFPU composite layer with tunable carbon nanotubes (CNTs) loading is coated onto the conductive microfiber fabric to modulate impedance matching. This dual-conductive configuration facilitates an absorption-reflection-reabsorption mechanism, significantly enhancing both overall EMI shielding effectiveness (SE) and the absorption coefficient (A). At a minimal thickness of only 1.18 mm leather exhibits exceptional EMI SE values of 69.05 dB (A = 0.86) in the X-band and 73.26 dB (A = 0.92) in the Ku-band. Remarkably, the material maintains performance integrity after rigorous tests including ultrasonication, cyclic bending and peeling, demonstrating superior EMI shielding stability. This work provides a viable strategy for designing eco-friendly, absorption-dominated, and perceptive EMI-shielding skins for next-generation robotic and human-machine interaction systems. Download: Download high-res image (206KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 91
·88897-88903
·
IF 3.289
Na Wang,Xiaofeng Li,Jing Yang,Yuxia Shen,Jin Qu,Song Hong,Zhong-Zhen Yu
To enhance the recyclability while maintaining the high efficiency for the removal of organic dyes, monolithic polyurethane@reduced graphene oxide@manganese dioxide (PU@RGO@MnO2) hybrid sponge with a hierarchical structure and satisfactory flexibility is fabricated by self-assembly of RGO on a PU sponge followed by uniform coating of MnO2 nanoparticles onto RGO by means of an in situ redox reaction between RGO and KMnO4. RGO acts as an ideal substrate to accommodate MnO2 nanoparticles and prevents their aggregation, whereas the numerous hydrophilic MnO2 nanoparticles play dual roles of adsorption and catalytic degradation of methylene blue (MB) dye. The resultant hybrid sponge shows a hierarchical porous structure that provides fast transport channels and abundant active sites, benefiting the diffusion and removal of MB. By enhancing the mass transfer with the help of a micro-pump, the monolithic hybrid sponge acts as a filter for dye removal. Under the dynamic mode, the adsorption efficiency of the PU@RGO@MnO2 hybrid sponge for MB (50 ppm, 30 mL) reaches 94% after 20 min, whereas it is as low as 5% under the static mode. With the assistance of H2O2, the removal efficiency of the hybrid sponge is 96% at first time under the dynamic mode, whereas it is only 14% in the static mode. The monolithic hybrid sponge is highly efficient in adsorption and catalytic degradation of MB based on an adsorption–oxidation–desorption process. Even after being used 4 times, it still maintains excellent removal efficiency and recyclability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INFECTION AND IMMUNITY
·
2018
·
IF 3.256
Xiaoyu Gao,Qiuhong Xie,Ping Kong,Ling Liu,Sheng Sun,Boyu Xiong,Baojia Huang,Liang Yan,Jun Sheng,Hongyu Xiang
Postfermented Pu-erh tea (PE) protects against metabolic syndrome (MS), but little is known regarding its underlying mechanisms. Animal experiments were performed to determine whether the gut microbiota mediated the improvement in diet-induced MS by PE and its main active components (PEAC). We confirmed that PE altered the body composition and energy efficiency, attenuated metabolic endotoxemia and systemic and multiple-tissue inflammation, and improved the glucose and lipid metabolism disorder in high-fat diet (HFD)-fed mice via multiple pathways. Notably, PE promoted the lipid oxidation and browning of white adipose tissue (WAT) in HFD-fed mice. Polyphenols and caffeine (CAF) played critical roles in improving these parameters. Meanwhile, PE remodeled the disrupted intestinal homeostasis that was induced by the HFD. Many metabolic changes observed in the mice were significantly correlated with alterations in specific gut bacteria. Akkermansia muciniphila and Faecalibacterium prausnitzii were speculated to be the key gut bacterial links between the PEAC treatment and MS at the genus and species levels. Interestingly, A. muciniphila administration altered body composition and energy efficiency, promoted the browning of WAT, and improved the lipid and glucose metabolism disorder in the HFD-fed mice, whereas F. prausnitzii administration reduced the HFD-induced liver and intestinal inflammatory responses. In summary, polyphenol- and CAF-rich PE improved diet-induced MS, and this effect was associated with a remodeling of the gut microbiota.
研究领域:
营养学
·
微生物学
·
代谢学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Chao Wang,Juan Li,Ya Zhang,Zhongrong He,Yin Zhang,Xingmin Zhang,Zhuoyue Guo,Jianan Huang,Zhonghua Liu
The sensory qualities , aroma profile, and microstructural features of instant Pu-erh teas (IPTs) produced by electrostatic spray drying (ESD) were evaluated by sensory and instrumental analyses and compared with those produced by other drying methods (freeze-drying [FD], vacuum drying [VD], and conventional spray drying [CSD]). The sensory qualities of ESDIPT were similar to those of FDIPT, and better than those of VDIPT and CSDIPT. Eighty-eight volatiles were detected in all IPTs, and 45 odor-active compounds were captured. Most of their OAVs were higher in ESDIPT than in VDIPT and CSDIPT but were lower than those in FDIPT. Dihydro-β-ionone had the highest OAV. Aroma recombination experiments were performed to verify the identification results. ESDIPT was present in the shape of microspheres with many regular concave surfaces, which was different from those treated by other drying methods. In terms of sensory quality and productivity, ESD would be a potential method for IPT production.
研究领域:
食品科学
·
茶叶技术
·
农学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xue Yang,Jian Zou
The facile fabrication of VO 2 thermochromic film with outstanding solar modulation ability along with high luminous transmittance is still challenging for the large-scale practical application of VO 2 films. The dispersity of VO 2 in polymer matrix can determine the optical performance of VO 2 thermochromic film to some content. Herein, the VO 2 nanoparticles were prepared by one-step hydrothermal method and directly dispersed in polyurethane (PU) sol with different viscosity to cast the VO 2 composite film . The solar modulation ability (ΔT sol ) almost increased linearly with the logarithm of viscosity for PU sol, and ΔT sol can be enhanced to 14.5% from 6.6% while maintaining a high T lum beyond 54% only by changing the content of thickener. The ΔT sol increased further to 20.0% for the three layers film. The enhanced optical performances might be attributed to the good dispersity of VO 2 nanoparticles and pore structure in PU matrix. This study provides a novel strategy in preparing VO 2 film for the applications in smart windows.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Zhichao Xiong,Wanzhen Feng,Dongzhou Xia,Jixin Zhang,Yuming Wei,Tiehan Li,Junlan Huang,Yujie Wang,Jingming Ning
The authenticity of the geographical origin of agricultural products has received widespread attention. Tea tree varieties, processing processes and origins influence the quality and price of raw pu-erh tea (RPT). This study distinguished RPT from 10 different production areas through headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) combined with orthogonal partial least squares–discriminant analysis (OPLS-DA) model and machine learning algorithms. Among the thirty-five types of common volatiles identified, pentanal, heptanal, naphthalene, cedrol, and 2,6-di- tert -butylbenzoquinone were considered the key differential compounds distinguishing the 10 different production areas of the RPT samples through the screening of variable importance in projection values of the OPLS-DA and coefficient weights of the linear discriminant analysis function. Among them, heptanal and 2,6-di- tert -butylbenzoquinone had the highest content in West of Bingdao and the lowest content in Nannuoshan. The random forest algorithm achieved a discrimination accuracy of 98.4% based on the discrimination of five key compounds in 63 RPT samples. The random forest model was demonstrated to be reliable and valid by using receiver operating characteristic curves (area under the curve = 0.7603). The study results serve as a reference for the differentiation of 10 production areas of RPT.
研究领域:
食品科学
·
分析化学
·
机器学习
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2016
·Vol. 27
·期 11
·1501-1507
·
IF 1.823
Zhubo Liu,Bing Zhou,A.V. Rogachev,M.A. Yarmolenko
Polytetrafluoroethylene (PTFE) composite coatings doped copper acetate and polyurethane (PU) were prepared on rubber substrate by low-energy electron beam dispersion technique. The effects of dopant and glow discharge treatment on the surface morphology, structure and tribological properties of the coatings were investigated. The results showed that Cu–PTFE composite coatings form uniform surface and dense column structure with spherical aggregations under glow discharge treatment. PU coating shows the large size of protuberance structure but PU–PTFE coating presents spherical structure. Both of the coatings become relative dense and smooth after discharge treatment, and Cu–PU–PTFE composite coatings possess a smoother surface and lower polar component of surface energy. Cu doping weakens the crystallinity and ordering degree of composite coatings, but glow discharge increases the ordering degree and branched structure of C―H groups. Friction experiment indicated that Cu fails to improve the wear resistance of PTFE coatings but glow discharge treatment can do it. Cu–PU–PTFE coatings after discharge treatment have the higher wear resistance and lower coefficient of friction. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
表面工程
·
高分子材料
·
摩擦学
·
等离子体物理
·
涂层技术
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Jiaying Yang,Danqiu Li,Jiayi Chen,Wenkai Zhang,Zixin Ni,Hongjing Pan,Yuefei Wang,Xiaoli Li,Jihong Zhou
Microclimate shapes sensory, chemical, and microbial changes in Pu-erh raw tea. • Microbial shifts drive chemical evolution during natural tea storage. • Hyperspectral-based machine learning identifies storage years accurately. • Two-dimensional correlation spectroscopy reveals sequential component changes. • Random forest models predict and visualize key bacterial abundances from spectra. This study developed a non-destructive approach for identifying storage years and quality evolution of Pu-erh raw tea by integrating sensory evaluation, chemical analysis, electronic nose/tongue, hyperspectral imaging, and 16S rRNA sequencing. Results revealed that Bacillus and Pantoea shifts drive chemical transformations; notably, Bacillus abundance reached 40.44% in Hangzhou-stored samples after six years, correlating with significant degradation of polyphenols and ester-type catechins. Specific wavelengths at 1633, 1085, and 1250 nm were intrinsically linked to alterations in caffeine, polyphenols, and amino acids, respectively. Among tested models, Random Forest coupled with Standard Normal Variate preprocessing achieved 100% classification accuracy in the near-infrared band. Furthermore, Random Forest regression successfully visualized bacterial succession trends based on spectral data. Overall, this integrated strategy provides a rapid, non-invasive methodological framework for tea quality control, offering a valuable reference for the future expansion and validation of diverse tea aging processes.
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yanlan Zhou,Ruishuo Guo,Huijia Wang,Xin Xu,Zhiqiang Li,Zhuolu Li,Xile Chen,Ni Li
APTES modification promotes uniform PCNC loading on PU/PEG fibers. • The composite membrane shows enhanced thermal conductivity of 0.129 W · m⁻ 1 ·K⁻1. • The membrane maintains good stability after thermal cycling and water treatment. • High solar reflectance (∼95%) enables effective temperature regulation under simulated solar irradiation. Polyethylene glycol (PEG)-based phase change fibrous membranes are promising flexible thermal management materials, but their performance is often limited by melting-induced deformation, low heat-transfer efficiency, and insufficient cycling stability. In this study, an APTES-regulated interfacial loading strategy was developed by loading amino-functionalized n-octadecane/SiO 2 phase change nanocapsules (N x -PCNCs) onto electrospun PU/PEG fibrous membranes. The effect of APTES concentration on the capsule loading state and thermal management performance was systematically investigated. Moderate APTES modification improved the loading and dispersion of PCNCs on the fiber. Among the samples, PU/PEG/N 20 -PCNCs showed a relatively uniform particle distribution and a thermal conductivity of 0.129 ± 0.015 W · m⁻ 1 · K⁻ 1 . The composite fibrous membrane maintained stable phase-change behavior after 200 melting–crystallization cycles and 20 water-treatment cycles, demonstrating good cycling stability under the tested conditions. Moreover, PU/PEG/N 20 -PCNCs exhibited an average solar reflectance of approximately 95 ± 0.8% and reduced the surface temperature by 9.2 and 2.3 °C compared with PU and PU/PEG fibrous membranes under simulated solar irradiation. These results demonstrate that APTES-regulated interfacial loading of PCNCs is an effective strategy for improving the thermal storage, stability, and temperature-buffering performance of PU/PEG phase change fibrous membranes. Download: Download high-res image (136KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）