JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Yu-Ying Zhang,Yu-Xi Liu,Zheng Zhou,Da-Yong Zhou,Ming Du,Bei-Wei Zhu,Lei Qin
Reversed-phase ultrahigh-performance-liquid chromatography–mass spectrometry (UPLC–MS) is the typical method for the lipidomic analysis of most of biological samples, which was rarely used for the comprehensive lipidomic analysis of marine shellfish. Thus, a range of columns, modifiers, and resuspension solvents were evaluated using UPLC-electrospray ionization-quadrupole time-of-flight-MS to facilitate the ionization efficiency in both the positive and negative electrospray ionization (ESI(+)/(−)) modes for abalone lipids. Optimal lipidomic coverage was acquired with 10 mM ammonium formate in both ESI(+)/(−) modes. The selected resuspension solvents also influenced ionization efficiency through the matrix effect, and resuspension in methanol enhanced the signal intensities by reducing ion suppression. Because of the higher glycerophospholipid content in shellfish, bridged ethylene hybrid C8 columns showed clear advantages over charged surface hybrid C18 columns. A series of glycerophospholipids, lyso-glycerophospholipids, glycerolipids, and fatty acids in different shellfish can be annotated and semiquantified in one injection by the optimized method.
研究领域:
分析化学
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生物化学
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DOI
PubMed
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 8
·2951-2960
·
IF 5.231
Minghui He,Guangxue Chen,Xun Huang,Ruixin Xu,Zhaohua Zeng,Jianwen Yang
N-Phthaloyltranexamic acid ammonium salt derivatives integrating with peroxides can invoke redox photopolymerization and propagating polymerization. A series of N-phthaloyltranexamic acid ammonium salt derivatives based on benzophenone, thioxanthen, and naphtha chromophores as novel photocaged bases were synthesized and characterized. In combination with a benzoyl peroxide initiator, these structures were able to initiate the amine-mediated redox photopolymerization of acrylates. In particular, the covalent binding of N-phthalimidoamino acid and type II chromophores (thioxanthone, benzophenone) improved remarkably the photoreactivity of photocaged bases (thioxanthen-DBU and benzophenone-DBU) compared to the parent compound. Furthermore, naphthal-DBU matches well the emission spectra of the mercury lamp with a dominant emission wavelength at 365 nm. More importantly, phthal-DBU & BPO as a new photocaged redox combination can invoke controlled redox polymerization within an irradiation time of 3 min. Finally, due to the persistent interaction of the produced longeval amine with peroxides, remarkable post conversion after irradiation, which is significant for preparation of photo-screened materials, was thus initially achieved in the redox photopolymerization.
研究领域:
材料化学
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高分子科学
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有机化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Suzhou Dai,Yonggao Yin,Yikai Wang,Xuanlin Liu,Maurizio Peruzzini,Francesco Barzagli
Chemical heat pump based on ammonium carbamate (AC) is a promising low-grade heat utilization technology. It is essential to know the chemical equilibrium properties in the application of AC-based technologies. AC is usually mixed with solvents to realize circulation. However, the existing studies mainly focus on AC in the solid phase. Therefore, the influence of solvents on the chemical equilibrium of AC was experimentally investigated in this work. The results confirm the solvent effect on the equilibrium pressure of AC in the range of 10∼90 °C. For solvents capable of dissolving AC, the equilibrium pressure increases with both AC concentration and temperature. The solvent effect is mainly due to the influence on both the reaction enthalpy and entropy change terms. An equilibrium pressure–temperature–concentration relationship of AC solution is established. These results provide essential parameters for the design and operation of low-grade heat management and utilization systems based on AC.
研究领域:
热力学
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化学工程
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能源技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
J.Y. Yong,R.Y. Xie,Q. Huang,X.J. Zhang,B. Li,P.F. Xie,C.F. Wu,L. Jiang
Due to the superior CO 2 adsorption capacity and selectivity, amine-functional solid adsorbents have received increasing attention. Nevertheless, amine-functionalized polyporous materials have a large performance deviation when considering carbon removal capacity under wet flue gas. Therefore, a variety of metal–organic frameworks (MOFs) with amine functionality are synthesized in this work by appending diamine with a propylene linker to Mg 2 (dobpdc) (dobpdc 4- = 4,4′-dioxido-3,3′-biphenyldicarboxylate) and screened under the simulated flue gas environment with a high water content (7 v%). The results indicate that ndmpn-grafted Mg 2 (dobpdc) (ndmpn = N,N-dimethyl-1,3-propanediamine) has a high CO 2 adsorption capacity of 1.72 mmol/g at 60 °C with an extremely low regeneration heat (2.26 GJ/ton CO 2 at the desorption temperature of 145 °C). Adsorption property of ndmpn-Mg 2 (dobpdc) at high humidity is even more excellent than that of another well-reported diaminopropene-appended MOF, dmpn-Mg 2 (dobpdc) (dmpn = 2,2-dimethyl-1,3-propanediamine). Herein, van der Waals (vdW)-corrected density functional theory (DFT) calculations are used to quantitatively analyze binding strengths and water effects on it between diamine-appended Mg 2 (dobpdc) and CO 2 . It is revealed that the addition of water makes ammonium carbamate chains produced in ndmpn-Mg 2 (dobpdc) more stable. These chemisorption structures under humid conditions have also been disclosed by using 15 N solid-state nuclear magnetic resonance (NMR) spectroscopy experiments and DFT calculation. To conclude, we unveil the binary adsorption characteristics and mechanism of ndmpn-Mg 2 (dobpdc). It enables a thorough understanding of this compound and highlights its potential as a promising adsorbent under humid conditions for post-combustion applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RARE METALS
·
2012
·Vol. 31
·期 5
·512-516
·
IF 0.593
Lian Yuanpei,Zhen Wei,Tai Zhigang,Yang Yaling,Song Jun,Li Zonghao
Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(II)), platinum (Pt(IV)), and gold (Au(III)) in the soil of industrial sewage. Ammonium pyrolysine dithiocarbamate (APDC) was adopted as the chelating agent prior to CPE and then was detected by atomic absorption spectrometry (AAS). Different parameters such as the concentration of surfactants, chelating agent and salt, sample pH, equilibration temperature and time, centrifugation time and rates, and the effect of foreign ions were studied. Under optimum conditions, the low limits of detections are 1.4, 2.8 and 1.2 ng·ml −1 and the enrichment factors are 21, 12, and 24 for Pd(II), Pt(IV), and Au(III), respectively. The relative standard deviations vary from 0.6% to 1.0% ( n =11). All correlation coefficients of the calibration curves are >0.9960. The proposed method was successfully applied for the determination of Pd(II), Pt(IV), and Au(III) in the real soil of industrial sewage samples.
研究领域:
分析化学
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环境化学
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重金属检测
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分离科学
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环境监测
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DOI
高影响因子
ANALYST
·
2015
·Vol. 141
·期 3
·1077-1082
·
IF 4.107
Xiuyun Wang,Min Xi,Mengmeng Guo,Fangmeng Sheng,Guang Xiao,Shuo Wu,Shunichi Uchiyama,Hiroaki Matsuura
In this contribution, a very simple and reliable strategy based on the easy modification of a glassy carbon electrode (GCE) by pre-electrolyzing GCE in ammonium carbamate aqueous solution was employed for the simultaneous determination of hydroquinone (HQ) and catechol (CC). Compared with bare GCE, the incorporation of nitrogen into the GCE surface structure improved the electrocatalytic properties of GCE towards the electro-oxidation of HQ and CC. The nitrogen-introduced GCE (N-GCE) was evaluated for the simultaneous detection of HQ and CC and the linear ranges for HQ and CC were both from 5 to 260 μM. Their detection limits were both evaluated to be 0.2 μM (S/N = 3). The present method was applied for the determination of HQ and CC in real river water samples with recoveries of 95.0–102.1%. In addition, a possible detection mechanism of HQ and CC was discussed.
研究领域:
电化学
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Qing Fu,Wenwen Dong,Dandan Ge,Yanxiong Ke,Yu Jin
The present paper illustrates the versatility of the supercritical fluid chromatography (SFC) since, for the first time, four spirooxindole alkaloids (SOAs) including two pairs of isomers were separated by using two types of reversed-phase/ ion chromatography (RP/IC) mixed-mode stationary phases. Two mixed-mode stationary phases (C8SAX and C8SCX) was simultaneously provided dispersive and electrostatic interactions, which were suitable for the separation of such alkaloids. This study tried to provide an in-depth understanding of the SFC separation mechanism of the mixed-mode stationary phase through investigation of the impact of changes in mobile phase composition on alkaloids’ retention behavior. On C8SAX, due to the strong electrostatic repulsion, there was a very narrow elution window of the alkaloids, of which behaviors were hardly affected by adding diethylamine in mobile phase. When adding formic acid or acidic ammonium formate, the prolonged retention time of alkaloids was presented because of the shielded effect of formate anions on the electrostatic repulsion. In particular, better peak shape and improved resolution were obtained by using acidic ammonium formate due to the deactivation of silanol groups by ammonium cations. On the other hand, both formic acid and acidic ammonium formate can strengthen the electrostatic attraction of C8SCX, causing difficult elution of the alkaloids. Ammonium cations from either the protonated diethylamine or the ionized ammonium formate, were considered as counter ions to effectively mask the electrostatic attraction of C8SCX, to significantly reduce the retention of alkaloids, but improve the resolution. Finally, utilizing two developed SFC methods, i.e. , C8SAX with EtOH+ 10 mM acidic ammonium formate in CO 2 , or C8SCX with EtOH+0.1% diethylamine in CO 2 , the baseline separation of corynoxeine and isocorynoxeine, rhynchophylline and isorhynchophylline was achieved within 5 min.
研究领域:
分析化学
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药学
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色谱学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Yiqing Yao,Min Zhang,Huimin Wang,Qingxia Huang,Xiaojin Tian,Yadan Zou,Xiangyan Li,Yuefei Wang,Qinhua Chen,Simiao Wang,Xue Li,Junhua Zhang,Wenzhi Yang
Ginseng is often steamed to enhance the efficacy, however, studies on the induced chemical transformation have seldom focused on the contained polysaccharides, hitherto. Herein, change of ginseng polysaccharides induced by the steaming was studied. Utilizing three ginseng varieties ( Panax ginseng , PG; P. quinquefolius , PQ; P. notoginseng , PN) as the templates, this work was designed to characterize the transformation of polysaccharides induced by steaming at different time (0 −10 h) by three-level fingerprinting, and to visualize them by in situ hydrolysis and desorption electrospray ionization-mass spectrometry imaging (DESI-MSI). After steaming, the total contents of polysaccharides in three ginseng varieties generally increased, but showed indistinctive changes in molecular weight distribution. Five oligosaccharide markers were selected enabling the differentiation of raw and steamed ginseng products. DESI-MSI could distinguish between the raw and steamed samples for each ginseng variety by five differential oligosaccharides, respectively, including the trisaccharide, tetrasaccharide, pentasaccharide, octasaccharide, tridecasaccharide, and pentadecasaccharide. In addition, based on the in vitro oxygen-glucose deprivation (OGD) and oxygen-glucose deprivation and reperfusion (OGD/R) models, examination and comparison among the polysaccharides from the raw materials and steamed products could unveil significant cardiomyocyte protection effect of PN-0h (raw material of P. notoginseng ) and PN-2h (steamed for 2 h), with potential mechanism of inhibiting the mitochondrial dependent pathways to reduce cell apoptosis rate. Conclusively, holistic transformation of polysaccharides during the steaming simultaneously from three ginseng varieties was depicted, for the first time. The obtained results can provide useful information for quality control of the raw and processed ginseng in the polysaccharide perspective.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yujie Wang,Jingxin Li,Honghua Wang,Shixin Zhang,Jie Zhang,Hailin Yang,Xiaomin Tang,Huaili Zheng
The efficient treatment of dyeing wastewater, a typical industrial wastewater, has aroused widespread attention. Flocculation was a vital pretreatment in dyeing wastewater treatment as it removed colloidal particles, reduced organic loading and improved the treatment efficiency of subsequent processes. However, the soluble dyes were rarely removed by traditional flocculation. In this study, the removal efficiencies of soluble dyes by flocculation were enhanced via synthesizing organic polymer flocculants with branched structure and block structure (PADS). The block length on PADS was regulated by the molecular weight of the template. PADS owned the high molecular weight, rich functional groups and outstanding flocculation performance. The largest removal rates of soluble Congo red, chrome black T and toluidine blue, 90.16 %, 88.41 % and 80.19 %, were achieved. The flocculation mechanisms for dyeing wastewater treatment were emphasized via Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) calculations and molecular dynamics simulations. Charge neutralization and the interaction between PADS and dyes mainly contributed to dye removal. The block structure of PADS strengthened these two processes. The branched structure of PADS facilitated bridging and promoted the formation of large and compact flocs, improving solid-liquid separation of dyes. PADS were potential candidates for improving dye removal in the pretreatment of dyeing wastewater.
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DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Shuangshuang Miao,Lingyu Sun,Xiangdong Liu,Yongping Chen
Ice accretion on airplane surfaces, power lines, or wind turbines causes severe detrimental effects on commercial and residential activities. A great deal of effort has been made to prepare facile and environmentally friendly anti-icing and de-icing surfaces over the last several years. Herein, we present a novel paraffin-infused polyurethane-carbon nanotubes micro-nanostructured icephobic surface (PIPCS) with desired photothermal, electrothermal, and switchable hydrophobic/slippery wettability features for anti-/deicing. The hydrophobic characteristic prevents the ice/frost formation, and the slippery property accelerates the removal of supercooled liquid water. The light-trapping effect from carbon nanotubes endows the film with superior non-contact deicing ability via light irradiation. Furthermore, spatiotemporal control of frost crystal growth on a surface could be achieved via coordination of the strength of cooling and irradiation. Additionally, for the scenarios of sunlight absence, PIPCS exhibits an outstanding electrothermal deicing ability under low voltage. The above properties make PIPCS a promising all-weather anti-icing surface for passive anti-icing and non-contacting deicing in high-altitude equipment and power transportation systems.
研究领域:
材料科学
·
表面工程
·
热管理
·
防冰技术
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纳米复合材料
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能源材料
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产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2025
·
IF 3.1
Zheming Yu,Yangyang Chen,Fengting Ou,Kui Zeng,Debo He,Lushan Yu
The aim of this study was to develop and fully validate a sensitive and rapid ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method for simultaneous quantification of Dimyristoyl phosphatidylcholine (DMPC) and Dimyristoyl phosphatidylglycerol (DMPG) in biological matrices of rats after intravenous administration of amphotericin B phospholipid complex suspension injection and excipients (DMPC and DMPG). DMPC, DMPG and Loratadine (internal standard, IS) were separated on an Agilent ZORBAX Extend-C18 column (2.1 mm × 50 mm, 3.5 μm particle size) by using gradient elution consisting of isopropanol-acetonitrile (90:10, v/v, 10 mM ammonium formate and 0.1 % formic acid) and water (10 mM ammonium formate and 0.1 % formic acid) at a flow rate of 0.3 mL/min in 4.0 min. Multiple reaction monitoring (MRM) mode was performed to quantify data under monitoring precursor-product ion transitions of m/z 678.9→184.0 (DMPC, ESI+), 665.5→227.2 (DMPG, ESI-) and 383.0→337.1 (loratadine, IS, ESI+), respectively. The method was developed at linearity ranging from 10.0 to 1000 ng/mL for all analytes. The inter-day accuracy of DMPC and DMPG was observed to range between −12.8–12.7 %, while the precision was found to be within 15.0 %. DMPC and DMPG demonstrated stability during sample storage, preparation and analytic procedures. Furthermore, this method was successfully applied in the investigation of the pharmacokinetic profile and tissue distribution of DMPC and DMPG in rats after intravenous administration. Dose-dependent increases were observed for DMPC and DMPG in both areas under the curve (AUC) and maximum plasma concentration (Cmax), demonstrating positive correlations across all tested dose levels. The biological half-lives (t₁/₂) of DMPC and DMPG following intravenous administration of an amphotericin B phospholipid complex suspension were 1.2–3.4 h and 4.6–8.1 h, respectively. However, after intravenous administration of the excipients, their half-lives were 3.5 h and 1.1–2.3 h. The observed prolongation of DMPC's half-life and concomitant shortening of DMPG's half-life are attributed to the distinct physicochemical properties of the nanoparticles.
研究领域:
药物分析
·
药代动力学
·
分析化学
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药物递送
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Yanbei Wei,Jie Deng,Liping Su,Lanlan Chen,Xin Hu,Huiyao Zhao,Rui Zhou,Jun Qu,Yangdi Chen,Haijin Li,Wenfeng Zhang
In n-i-p perovskite solar cells (PSCs) with tin oxide (SnO2) as the electron transport layer, the SnO2/perovskite interface serves dual functions: facilitating charge extraction and promoting perovskite crystal growth. However, significant nonradiative recombination, energy misalignment, and suboptimal interfacial bonding at the SnO2/perovskite interface result in efficiency loss and compromised stability. In this work, sulfonyl diimidazole (SDI) was introduced as a surface modifier for SnO2. SDI acts as a dual-modifier at the buried interface, binding strongly to both the SnO2 and perovskite layers. SDI effectively passivates SnO2 surface defects, optimizes band arrangement for better interfacial contact, and facilitates perovskite growth. This effectively promotes charge carrier transport, inhibits charge carrier recombination, and alleviates the film strain. The SDI-incorporated device demonstrated an improved power conversion efficiency (PCE) of 23.31%, surpassing the control device’s efficiency of 21.61%, alongside an elevation in fill factor from 77.3% to 81.56%. The optimized device demonstrates a 90% retention of its initial PCE after enduring 1000 h of aging, significantly outlasting the pristine SnO2-based counterpart. Consequently, the modification of interfaces utilizing SDI represents a viable approach to enhance the interface characteristics, elevate the quality of crystallization, and achieve high-performance PSCs.
研究领域:
材料科学
·
光伏技术
·
太阳能
·
界面工程
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）