JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 6
·803-810
·
IF 0
Jinbo Zhang,Lebin Wang,Shaofeng Liu,Zhibo Li
The synthesis of high-molecular-weight polyesters via the ring-opening alternating copolymerization (ROAC) of cyclic anhydrides and epoxides using organocatalysts remains a major challenge. In this context, the organic cyclic trimeric phosphazene base ( CTPB ) was used as an efficient catalyst for the ROAC of phthalic anhydride (PA) with epoxides. It was found that the activity and PA conversion dramatically increased with the addition of triethyl borane (TEB) as a cocatalyst, even a small amount of TEB, for example, 5 mol % relative to CTPB . The molecular structures of obtained polyesters were characterized by nuclear magnetic resonance ( 1 H NMR, 13 C NMR) and matrix-assisted laser desorption/ionization time-of-flight (MALDI TOF), which demonstrated the formation of perfectly alternating polyesters with unimodal and narrow molecular weight distributions. Different molecular weight polyesters (up to 118.5 kg mol −1 ) were facilely prepared by reducing the loading of CTPB and TEB, while the polymerizations were fast (turnover frequency, TOF up to 500 h −1 ). Thermal analysis of the resulting polymers indicated that the alternating polyesters were amorphous, and their T g s increased with the increment of molecular weights. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 803–810 Graphical Organic cyclic trimeric phosphazene base ( CTPB ) with triethyl borane (TEB) as a co-catalyst (even 5 mol% relative to CTPB ) is highly active toward ring-opening alternating copolymerization (ROAC) of phthalic anhydride (PA) with various epoxides. The polymerizations are fast (TOF up to 500 h −1 ), and the resulting polymers have high molecular weights (up to 118.5 kg mol -1 ) and perfect alternating sequences (ester > 99%).
研究领域:
高分子化学
·
材料科学
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DOI
JOURNAL OF COORDINATION CHEMISTRY
·
2025
·
IF 2.1
Mingzhe Li,Yuyang Zhou,Hua Zhou,Dingqiang Lu
Vitamin E is an important fat soluble antioxidant, its acetate is the main derivative product of vitamin E. Using metal organic framework material ZIF-8 as a catalyst, vitamin E acetate (VEA) was prepared by catalyzing the esterification reaction of D-α-tocopherol and acetic anhydride in a solvent-free system. Firstly, the preparation conditions of metal organic framework materials were studied: different imidazole ligands, different zinc ion ligands, molar concentration ratio of Zn2+ to 2-methylimidazole(2-mIM), and preparation time. The results showed that the catalytic performance of ZIF-8 was optimal when Zn(CH3COO)2·2H2O was used as the zinc source, 2-mIM was used as the imidazole ligand, the molar concentration ratio of Zn2+ / 2-mIM was 1:20, and the preparation time was 1 hour. The yield of vitamin E acetate was 86.85%. The synthesis process of VEA was optimized by single factor experiments such as substrate molar ratio, reaction time, dosage of nano enzyme, reaction temperature and so on. The results showed that the yield of vitamin E acetate reached 96.31% under the optimal conditions of n (D-α-tocopherol) =1mmol, [n (D-α-tocopherol) : n (Acetic anhydride)] =1:15, reaction time 24 h, ZIF-8 dosage 0.05 g, reaction temperature 50 °C.
研究领域:
化学
·
生物学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 4
·2931-2937
·
IF 1.354
Zhu Changhao,Ma Xiaoe,Ma Dandan,Zhang Tianzhu,Gu Ning
For computed tomography (CT) angiography and drug release application, a kind of novel dextran hydrogel microspheres were prepared. β-cyclodextrin (β-CD) grafted poly(methyl vinyl ether-altmaleic acid) (PMVE-alt-MA-g-β-CD) and succinic acid modified
dextran (Dex-SA) were first prepared, and then PMVE-alt-MA-g-β-CD was further used as the cross-linking agent to cross link Dex-SA for the formation of dextran hydrogel microspheres by using an inverse suspension polymerization method for the potential interventional embolization.
The average diameter of the dextran hydrogel microspheres was 35 μm with 90% ranging from 20 μm to 50 μm. The obtained microspheres showed a rather high swelling rate and loading capacity of drug doxorubicin hydrochloride with content of 9.2 wt%. The results of
in vitro experiments showed that about 35.5% of the total amount of the encapsulated doxorubicin hydrochloride can be released after 4 h at 37 °C. The microspheres had a good mechanical stiffness with Young’s modulus of about 20.0 kPa. Iodine molecules (I2) can
be incorporated within the cavity of grafted cyclodextrin only through simply soaking in I2 aqueous solution, and these I2-loaded microspheres can preliminarily realize the function of CT angiography. This kind of dextran hydrogel microspheres with good biocompatibility would be
a promising embolization material.
研究领域:
生物材料学
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医学影像学
·
药剂学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2022
·
IF 3.262
Lingzhi Zhang,Yinghao Wang,Fang Zheng,Di Zhu,Yongmei Liang,Quan Shi
The collision cross-section (CCS) values of ions determined by ion mobility-mass spectrometry (IM-MS) can be used to deduce the shape and size of the ions. For each compound, as well as its isomer or tautomer, a unique arrival time peak was obtained in extracted ion mobility (EIM) spectra, which corresponded to a specific CCS value. However, the generation of solvated ions by electrospray ionization (ESI) increases the number of mobility peaks, which makes the EIM spectra difficult to interpret. In this study, solvent clusters formed by acetonitrile and methanol around 1,8-naphthalic anhydride (1,8-NA) cations ([C12H6O3 + H]+1,8-NA) were investigated using trapped ion mobility spectrometry-time-of-flight mass spectrometry (TIMS-TOF MS). The effects of infusion flow rate, nebulizer gas pressure, drying gas rate, and drying gas temperature on the formation of solvent clusters from acetonitrile and methanolic solution were systematically studied. The formation of solvent clusters was observed with infusion flow rates increased, which was manifested by the larger experimental CCS values of [C12H6O3 + H]+1,8-NA. Acetonitrile tended to form solvent clusters around ions more readily than methanol. These solvent clusters were stable enough to be detected by TIMS, but they cannot survive under ion activation conditions of mass spectrometry (MS). Increasing the nebulizer gas pressure seems to be a better way to eliminate the formation of solvent clusters in TIMS-TOF MS and give a “cleaner” EIM spectra. The current research demonstrates that more attention should be paid to the solvent effect on CCS values and their interpretation.
研究领域:
分析化学
·
质谱学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-13
·
IF 5.3
Li Yilong,Hang Yuteng,Gopali Rusha,Xu Xinxin,Chen Guanhua,Guan Xiaorong,Bao Ning,Liu Yang
Screen-printed carbon electrodes (SPCE) functionalized with MXene-based three-dimensional nanomaterials are reported for rapid determination of creatinine. Ti 3 C 2 T X MXene with in situ reduced AuNPs (MXene@AuNP) were used as a coreactant accelerator for efficient immobilization of enzymes. Creatinine could be oxidized by chitosan-embedded creatinine amidohydrolase, creatine amidinohydrolase, or sarcosine oxidase to generate H 2 O 2 , which could be electrochemically detected enhanced by Prussian blue (PB). The enzyme@CS/PB/MXene@AuNP/SPCE detected creatinine within the range 0.03–4.0 mM, with a limit of detection of 0.01 mM, with an average recovery of 96.8–103.7%. This indicates that the proposed biosensor is capable of detecting creatinine in a short amount of time (4 min) within a ± 5% percentage error, in contrast with the standard clinical colorimetric method. With this approach, reproducible and stable electrochemical responses could be achieved for determination of creatinine in serum, urine, or saliva. These results demonstrated its potential for deployment in resource-limited settings for early diagnosis and tracking the progression of chronic kidney disease (CKD). Graphical Abstract
研究领域:
生物传感器
·
医学诊断
·
纳米材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jingyang Shi,Jing Lv,Jieliang Wang,Zhao Cao,Yongsheng Sun,Jiali Wang,Wenda Lu,Yongdan Cao,Jiayan Tang,Xiaoping Wang
Hydrolytic polymaleic acid (HPMA) was used as a highly selective depressant instead of water glass to achieve the flotation separation of parisite from calcite and fluorite. The inhibitory effect and mechanism of HPMA on fluorite and calcite was investigated using micro-flotation, zeta potential, contact angle measurements, adsorption measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and quantum chemical calculations. The results from single and artificially mixed minerals showed that parisite could be successfully separated from calcite and fluorite by using HPMA as a depressant. Further analysis revealed that HPMA chemically adsorbed onto the Ca 2+ active sites of calcite and fluorite, forming a hydrophilic compound, Ca(COOR), which prevented the octyl hydroxamic acid (OHA) collector adsorbing on their surfaces. In contrast, HPMA only weakly physically adsorbed onto the surface of parisite, allowing it to maintain good floatability after conditioning with HPMA. Therefore, HPMA has a potential as an inhibitor for effectively separating parisite from fluorite and calcite in rare earth ore flotation process.
研究领域:
矿物加工工程
·
环境科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Jinlong Zhang,Shiyu Fu,Hao Liu,Juanli Shen,Xi Yuan,Xuepei Zhou
Bioplastics based on lignin-containing cellulose nanofibrils (LCNF) have emerged as attractive alternatives to petrochemical plastics. However, the preparation of LCNF-based bioplastics with excellent wet-mechanical properties and water stability remains challenging. This study reports a sustainable route for the preparation of LCNF-based bioplastics with excellent wet mechanical properties and water stability. First, a deep eutectic solvent was employed to pretreat the bamboo powder to partially remove lignin. Then, the pretreated bamboo powder was esterified by one-step maleic anhydride (MAH) esterification to produce maleic anhydride-esterified LCNF (MLCNF). MLCNF exhibits a high aspect ratio (337), fine diameter (4.6 nm), and high surface charge (1.67 mmol/g). These properties endow MLCNF bioplastics with excellent wet elongation at break (41 %, significantly higher than other cellulose-based bioplastics), wet tensile strength (43.5 MPa), wet toughness (9.8 MJ m −3 ), dry tensile strength (164 MPa), dry toughness (15.7 MJ m −3 ), thermal stability, hydroplastic properties, and water stability (water contact angle: 91°). This research provides a straightforward, eco-friendly, and efficient approach for developing bioplastics with excellent wet mechanical properties and water stability using renewable lignocellulosic resources, with the potential to replace petrochemical plastics.
研究领域:
材料科学
·
生物质资源利用
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产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Ridong Hu,Chong Mao,Hao Zhuo,Xiaobing Dai,Lewen Yang,Xugang Shu,Yang Li,Zhanqiang Li,Wenhong Ruan,Fujie Yang,Xudong Chen
The precarious interfacial chemistry between the electrode and electrolyte is the determining step that restricts the long cycle life of Ni-rich-based Li-metal batteries. Here we show that the robust cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) layers can be engineered by tuning the spatial linking structure of dipentacyclic anhydride (DPA) additives. Specifically, an inorganic-rich CEI/SEI layer induced by CBDA (a DPA featuring a quaternary ring spatial linking structure) exhibits superior Li + interfacial kinetics and an ultra-stable cycle performance, outperforming the other systems. As a result, the NCM811ǁLi cells containing CBDA show excellent long-term performances, even under high voltage, high load, and high charge-discharge current density, respectively. The coin-cell using a low-loading cathode exhibits 129 mAh g- 1 discharged capacity for over 200 cycles at a 6 C rate. Moreover, The high-loading cathode retains 80 % capacity after 312 cycles at 1.0 C. Furthermore, the NCM811ǁLi pouch cell demonstrated a capacity retention rate of 99.8 % after 50 cycles. Prolonged stable cycling for 900 cycles (93 % capacity retention) in an NCM811ǁGraphite pouch cell is enabled by CBDA. The DPA-based additives in this work offer a highly promising and feasible route to achieving a long-term and high-capacity lithium battery featuring a Ni-rich cathode.
研究领域:
电化学储能
·
材料科学
·
能源化学
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2024
·
IF 3.3
Zhi-Wei Guo,Heng-Juan Li,Ning Peng,Ying-Qiu Li,Yan Liang,Yu-Ru Zhao,Cai-Yue Wang,Zi-Yue Wang,Chenying Wang,Xidong Ren
BACKGROUND Pea protein isolate (PPI) is gaining increasing popularity in the food industry. It provides a diverse range of health benefits, such as hypoallergenic and gluten-free characteristics. However, the functional performance of PPI is hindered by its low solubility and poor stability. Therefore, in this article, PPI and dextran (DX) of different molecular weights were grafted to investigate the effects of grafting DX with different molecular weights on the interface properties and antioxidant properties of PPI. Additionally, the stability and digestive properties of the glycated PPI nanoemulsion system were explored. RESULTS The result showed that the grafting degree of PPI–DX conjugates (PPI–DC) decreased with an increase in the molecular weight of DX. Surface hydrophobicity, antioxidant activity and solubility of PPI–DC were significantly improved after grafting compared with PPI and PPI–DX mixtures (PPI–DM). Astaxanthin-loaded emulsions stabilized by grafted conjugates had smaller droplets and higher astaxanthin encapsulation rate compared to PPI emulsions. In vitro digestion demonstrated that the bioavailability of PPI–DC emulsions was higher than of PPI emulsion. Furthermore, after 24 days of storage, retention rate of astaxanthin-loaded emulsions prepared by conjugates remained above 70%, surpassing that of PPI emulsion. CONCLUSION These results indicated that DX grafting can improve the emulsion properties of PPI. In addition, the DX with a molecular weight of 5 kDa showed the most significant improvement. This study contributes to the advancement of natural emulsifiers by modifying PPI through glycation, and furnishes a valuable reference for its utilization in functional foods. © 2024 Society of Chemical Industry.
研究领域:
食品科学
·
生物化学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 129
·期 2
·748-755
·
IF 1.289
Xipan Liu,Dan Pan,Qian Guo,Yanjun Zhao,Zheng Wang
This study designed a photo-crosslinkable poly(ether-anhydride) nanocarrier with folate modification to achieve both biodegradability and active targeting. The nanocarrier consists of a hydrophobic polymer core and a shell of folate and hydrophilic poly(ethylene glycol). Nuclear magnetic resonance and Fourier transform infrared spectroscopy were used to verify the synthesis and relevant intermediate products. The nanocarrier was characterized in terms of morphology and diameter using transmission electron microscopy and dynamic light scattering. The results showed that the size of spherical nanocarriers located within 200–400 nm. The cellular uptake profile of nanocarriers in HeLa cells was examined using fluorescence microscope with the help of a fluorescent molecule and the folate-modified nanocarrier exhibited an enhanced uptake compared to that without modification. The nanocarrier degradation at physiological temperature was investigated gravimetrically and the in vitro release of model drug, paclitaxel (PTX) was examined via the dialysis method. The erosion rate of poly(ether-anhydride) network was controlled by the crosslinking density and the hydrolytic susceptibility; the folate modification slightly slowed the degradation process. The time scale of PTX release perfectly matched with that of nanocarrier erosion; after 6 h more than 50% weight loss of nanocarrier was observed and meanwhile the drug release profile got plateaued, indicating the dominant role of polymer erosion in the release of the active agent from the nanocarriers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
生物医学工程
·
药物递送
·
肿瘤治疗
·
材料科学
·
药剂学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jianjun Du,Hong Du,Haoying Ge,Jiangli Fan,Xiaojun Peng
Silver is one of most important heavy metals, which affects the environment and organism significantly along with its widespread applications. An interesting gold nanoparticles (AuNPs)-based system, in this work, was fabricated using the adenosine and creatinine for the colorimetric recognition of the Ag + via a red-to-blue color change. A synergistic coordination of these two biomolecules with Ag + on AuNPs’ surface supplied an excellent selectivity than examples by a single ligand-modified AuNPs in literatures. It realized a qualitative Ag + recognition by naked eyes in aqueous media, as well as a quantitative determination by the UV–vis spectrometer over a range of 0.1–0.9 μM, covering the Ag + standard in drinking waters (0.46 μM, US Environmental Protection Agency). This system is not only convenient but also very sensitive with a limit detection of 7.3 nM. This platform is applicable for the Ag + recognition in mimic pollution samples with a good repeatability and relative standard deviation.
研究领域:
环境科学
·
分析化学
·
纳米技术
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 17
·46159
·
IF 1.901
Sheng Xu,Liang Shen,Cailian Li,Yan Wang
In this work, three dianhydrides with similar chemical structures, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), 4,4′-oxydiphthalic anhydride (ODPA), and pyromellitic dianhydride (PMDA), are employed for the crosslinking modification of poly(vinyl alcohol) (PVA) membranes for ethanol dehydration via pervaporation. The changes in crosslinking degree, surface hydrophilicity, and glass-transition temperature are investigated and compared. Compared to the pure PVA membrane, all crosslinked membranes show higher fluxes but lower separation factors, because of the higher fractional free volume and the lower hydrophilicity by the crosslinking of the PVA matrix, respectively. In addition, all crosslinked PVA membranes exhibit similar flux, and the separation factor presents a decreasing order of PVA/PMDA-2 > PVA/ODPA-2 > PVA/BTDA-2, which is in the reverse order of their hydrophilicity, probably because of the reduction in the swelling resistance. With the PMDA content increasing from 0.01 to 0.04 mol/(kg PVA) in the PVA/PMDA crosslinked membranes, the crosslinking degree is enhanced and the hydrogen bonding is weakened, resulting in a flux increase from 120.2 to 190.8 g m −2 h −1 , but the separation factor declines from 306 to 58. This work is believed to provide useful insight on the chemical modification of PVA membranes for pervaporation and other membrane-based separation applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46159.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）