Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 38
·18649-18659
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IF 9.931
Zheming Liu,Aiwei Tang,Jun Liu,Dongxu Zhu,Xifeng Shi,Qinghua Kong,Zhijie Wang,Shengchun Qu,Feng Teng,Zhanguo Wang
Multinary copper-based chalcogenides have been exploited in photocatalytic hydrogen generation due to their exceptional visible light absorption properties and environmentally friendly character. Similar to other photocatalysts, to reinforce the charge separation and transfer is one of the most important pathways to enhance photocatalytic hydrogen evolution, which can be achieved by rationally designing the nanostructures and geometries of multinary copper-based chalcogenides. Herein, an improved photocatalytic hydrogen evolution is successfully realized in L-shaped Cu–Ga–Zn–S (CGZS) alloyed nanorods compared with the binary Cu31S16 and ternary CuGaS2 nanocrystals. The L-shaped wurtzite CGZS nanorods with a uniform spatial composition distribution are synthesized via a non-injection solution approach for the first time. The successive incorporation of zinc and gallium ions into Cu31S16 seeds leads to formation of Cu31S16–ZnS and Cu31S16–CGZS heteronanostructures and finally results in the formation of single phase CGZS nanorods. The intrinsic features of L-shaped wurtzite CGZS nanorods offer efficient spatial charge separation and electrical transport, which contribute synergistically to the improved photocatalytic activity. This study provides a new way to develop novel multinary copper-based chalcogenides with flexible nanostructures for efficient photocatalytic hydrogen production.
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BIOMACROMOLECULES
·
2017
·
IF 5.246
Yunxia Ni,Jing Sun,Yuhan Wei,Xiaohui Fu,Chenhui Zhu,Zhibo Li
Amphiphilic block copolymers containing polypeptides can self-assemble into a variety of nonspherical structures arising from strong interactions between peptide units. Here, we report the synthesis of a pH-responsive poly(ethyl glycol)-block-poly(l-glutamic acid)-block-poly(N-octylglycine) (PEG-b-PGA-b-PNOG) triblock copolymers by sequential ring-opening polymerization using amine-terminated poly(ethyl glycol) as the macroinitiator followed by selective deprotection of the benzyl protecting group. The obtained triblock copolymer can be directly dispersed in aqueous solution with hydrophilic PEG, pH-responsive PGA block, and hydrophobic PNOG. We present a systematic study of the influence of pH, molar fraction, and molecular weight on the self-assemblies. It was found that the PEG-b-PGA-b-PNOG triblock tends to form two-dimensional nanodisks and nanosheet-like assemblies. The nanodisk-to-nanosheet transition is highly dependent on the pH and molar fraction despite the different molecular weights. We demonstrate that the dominant driving force of the nanodisks and nanosheets is the hydrophobicity of the PNOG blocks. The obtained bioinspired 2D nanostructures are potential candidates for applications in nanoscience and biomedicine.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 4
·982-989
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IF 2.557
Yuanyuan Li,Nan Zhu,Bingxiang Li,Tong Chen,Yulong Ma,Qiang Li
A new silver-functionalized silica-based material with a core–shell structure based on silver nanoparticle-coated silica spheres was synthesized, and silver nanoparticles were modified using strongly bound l- cysteine. l- Cysteine-silver@silica was characterized by scanning electron microscopy and FTIR spectroscopy. Then, a solid-phase extraction method based on l- cysteine-silver@silica was developed and successfully used for bisphenol A determination prior to HPLC analysis. The results showed that the l- cysteine-silver@silica as an adsorbent exhibited good enrichment capability for bisphenol A, and the maximum adsorption saturation was 20.93 mg/g. Moreover, a short adsorption equilibrium time was obtained due to the presence of silver nanoparticles on the surface of the silica. The extraction efficiencies were then optimized by varying the eluents and pH. Under the optimized conditions, good linearity for bisphenol A was obtained in the range from 0.4 to 4.0 μM ( R 2 > 0.99) with a low limit of detection (1.15 ng/mL). The spiked recoveries from tap water and milk samples were satisfactory (85–102%) with relative standard deviations below 5.2% ( n = 3), which indicated that the method was suitable for the analysis of bisphenol A in complex samples.
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POLYMER INTERNATIONAL
·
2017
·Vol. 67
·期 3
·313-321
·
IF 2.07
Chunyan Luo,Minrui Yang,Wei Xiao,Jingjing Yang,Yan Wang,Weixing Chen,Xia Han
Poly( l -lactic acid) (PLLA) is a good biomedical polymer material with wide applications. The addition of poly(ethylene glycol) (PEG) as a plasticizer and the formation of stereocomplex crystals (SCs) have been proved to be effective methods for improving the crystallization of PLLA, which will promote its heat resistance. In this work, the crystallization behavior of PEG and PLLA/poly( d -lactic acid) (PDLA) in PLLA/PDLA/PEG and PEG- b -PLLA/PEG- b -PDLA blends has been investigated using differential scanning calorimetry, polarized optical microscopy and X-ray diffraction. Both SCs and homocrystals (HCs) were observed in blends with asymmetric mass ratio of PLLA/PDLA, while exclusively SCs were observed in blends with approximately equal mass ratio of PLLA/PDLA. The crystallization of PEG was only observed for the symmetric blends of PLLA 39k /PDLA 35k /PEG 2k , PLLA 39k /PDLA 35k /PEG 5k , PLLA 69k /PDLA 96k /PEG 5k and PEG- b -PLLA 31k /PEG- b -PDLA 27k , where the mass ratio of PLLA/PDLA was approximately 1/1. The results demonstrated that the formation of exclusively SCs would facilitate the crystallization of PEG, while the existence of both HCs and SCs could restrict the crystallization of PEG. The crystallization of PEG is related to the crystallinity of PLLA and PDLA, which will be promoted by the formation of SCs. © 2017 Society of Chemical Industry
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COMBUSTION AND FLAME
·
2024
·
IF 5.8
Xueqin Liao,Jianzhong Liu,Zexu Li,Mengxia Sun
Aluminum (Al) particles are widely used in propellants, thermite and pyrotechnics. However, commonly used micro Al has drawbacks such as agglomeration, high ignition temperature and slow burning rate, making its energy potential not fully exploited in applications. Therefore, exploring pathways to enhance the combustion of Al particles has become the focus at present. Herein, L -malic acid (LMA) was used to corrode the surface of Al particles to obtain a sample (named LMAl) with an average specific surface area of 11.456 m 2 /g (corresponding to Al particles with a diameter of 194 nm). The particle size distribution of LMAl did not change significantly compared to pristine Al. The XPS results showed that a small amount of LMA and corrosion products remained on the surface of the LMAl particles. Thermal analysis tests showed that the thermal oxidation rate and efficiency of LMAl was dramatically higher than that of pristine Al. Compared with the pristine Al, the combustion characterization parameters of LMAl such as combustion intensity, ignition delay time, maximum combustion temperature, mass burning rate and combustion efficiency were all improved. This trend was maintained after blending the ammonium perchlorate (AP). The condensed combustion products (CCPs) of Al revealed a large number of agglomerates and unburned Al particles. While many broken particles and tentacle-like structures were found in the CCPs of LMAl. Overall, compared to Al, the combustion of LMAl is significantly enhanced. The thermal reaction and combustion behaviors of the two are quite different. This study provides new insights into improving the ignition and combustion of Al.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Kairong Wu,Hao Zhang,Xinjiang Lou,Xiaodan Wu,Ying Wang,Kuangyu Zhao,Xin Du,Xiufang Xia
The structure, physicochemical and anti-freeze properties of natural deep eutectic solvent (NADES) composed of inulin and L-proline (molar ratio of 1:11) were investigated. Proton nuclear magnetic resonance ( 1 H NMR), Fourier infrared spectroscopy (FTIR), and Raman spectroscopy revealed extensive hydrogen bonding in the pure NADES system, and the addition of water weakens the hydrogen bonding interactions between the components. The smaller transverse relaxation time ( T 2 ) represents the stronger hydrogen bond strength, and NADES+40 % H 2 O exhibited a large T 2 (71.68 ms). When 10 % water was added, the viscosity decreased from 3620 mPa·s to 1777 mPa·s, but the conductivity increased to approximately twice the original value. Furthermore, adding 10 % water lowered the glass transition temperature (T g ) of NADES by 5.6 °C. NADES+10 % H 2 O exhibited favorable thermal stability and freezing resistance, as evidenced by the fact that approximately 82.61 % of the ice crystals area <200 μm 2 after 30 min of crystallization . The changes in the structure, physicochemical, and anti-freezing properties of water-tailored NADES are expected to enable the design of novel antifreeze agents.
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高影响因子
CARBOHYDRATE POLYMERS
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2024
·
IF 10.7
Rahila Hafeez,Junning Guo,Temoor Ahmed,Hubiao Jiang,Mubashar Raza,Muhammad Shahid,Ezzeldin Ibrahim,Yanli Wang,Jiaoyu Wang,Chengqi Yan,Qianli An,Jason C. White,Bin Li
Rice blast disease (RBD) caused by Magnaporthe oryzae , threaten food security by cutting agricultural output. Nano agrochemicals are now perceived as sustainable, cost-effective alternatives to traditional pesticides. This study investigated bioformulation of moringa chitosan nanoparticles (M-CsNPs) and their mechanisms for suppressing RBD while minimizing toxic effects on the microenvironment. M-CsNPs, sized 46 nm with semi-spherical morphology, significantly suppressed pathogen growth, integrity, and colonization at 200 mg L −1 in vitro . Greenhouse tests with foliar exposure to the same concentration resulted in a substantial 77.7 % reduction in RBD, enhancing antioxidant enzyme activity and plant health. Furthermore, M-CsNPs improved photosynthesis, gas exchange, and the nutritional profile of diseased rice plants. RNA-seq analysis highlighted upregulated defense-related genes in treated rice plants. Metagenomic study showcased reshaping of the rice microbiome, reducing Magnaporthe abundance by 93.5 %. Both healthy and diseased rice plants showed increased microbial diversity, particularly favoring specific beneficial species Thiobacillus , Nitrospira , Nocardioides , and Sphingomicrobium in the rhizosphere and Azonexus , Agarivorans , and Bradyrhizobium in the phyllosphere. This comprehensive study unravels the diverse mechanisms by which M-CsNPs interact with plants and pathogens, curbing M. oryzae damage, promoting plant growth, and modulating the rice microbiome. It underscores the significant potential for effective plant disease management.
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高影响因子
Journal of Cleaner Production
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2024
·
IF 9.7
Guoqing Dai,Hao Shi,Murray B. McBride,Haojie Fu,Zheng Li,Xinlei Wang,Shu Yang,Lei Wang,Fayuan Wang,Xinxin Li
Lead (Pb) can possess its solubility, bioavailability and toxicity modified with solid phase transformation, but the potential for such processes in heterogeneous soil-plant system remains unclear. Herein, we investigated the biogeochemical pathways controlling Pb partitioning mediated by strengite (Fe III PO 4 ) and oxalated zero-valent iron (Ox-nZVI). Batch tests verified that Fe III PO 4 and Ox-nZVI achieved the dissolution of stable P and Fe while fixing Pb. Pot experiments with Solanum nigrum L. further showed the simultaneous addition of Fe III PO 4 and Ox-nZVI to soil reduced porewater Pb and boosted the utilization efficiency of P and Fe as a result of favoring Pb retention in the soild phase as Pb 5 (PO 4 ) 3 OH and PbFe 12 O 19 . Characterization results revealed the liquid-solid transfer mass fluctuation depends on precipitation-dissolution and adsorption-desorption reactions of Pb-containing solids driven by Fe III PO 4 reductive dissolution and Ox-nZVI oxidative corrosion. Both Fe III PO 4 and Ox-nZVI promoted plant uptake of Pb in root cell wall as chloropyromorphite crystals but suppressed its upward translocation due to iron plaque barrier. Both Fe III PO 4 and Ox-nZVI recruited more Fe(II)-oxidizing genera and thus facilitated electron transfer processes in near-rhizosphere soil. These findings provide new insights into the role of Fe III PO 4 and Ox-nZVI in microscale Pb stabilization coupled with Fe and P cycling for contaminated media.
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高影响因子
CHEMICAL PHYSICS
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2024
·
IF 2
Ronghua Zhang,Shikun He,Fei Wang,Bo Cai,Junfeng Feng,Hui Pan
Porous bi-functional catalsyts consisting of metals and zeolites are used as solid acid catalysts, characterized by octahedral morphology and good stability. In this work, a series of bifunctional catalysts (xZr-HY) with Lewis and Brønsted acid sites were prepared by a simple impregnation method, and used for the conversion of glucose to levulinic acid and methyl levulinate. The catalysts were characterized using different methods of physical and chemical properties. The analysis results showed that these catalysts existed in tetrahedral form with good pore structure , suitable acid strength and acidity. Using 10Zr-HY as the catalyst, 43.0 % yield of LA and ML could be obtained at 200 ℃ for 2.5 h. In addition, this catalytic system also gave high LA and ML yields from other biomass carbohydrates. Meanwhile, the 10Zr-HY catalyst had good stability and reusability after four cycles. This catalyst has the potential to convert biomass into high value-added platform compounds.
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FOOD CHEMISTRY
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2024
·
IF 8.5
Jinjing Yin,Wei Liu,Muci Wu,Ming Chen,Xun Pei,Yuzhen He,Fangxiong Shen,Rui Zhang,Jingren He
Selenoproteins found in selenium (Se)-enriched vegetables play a vital role in maintaining human health. In this study, four Se-containing broccoli proteins (Se-BP: albumin, globulin, prolamin, and glutelin) were continuous extracted by Osborne method. Three ultrafiltered fractions were subsequently obtained from the glutelin hydrolysate, composed of Se-contained broccoli peptides (Se-Bp) with different molecular weights ( M W ), namely, < 1 kDa, 1–3 kDa, and 3–10 kDa. Glutelin exhibited the highest protein yield (65.60 ± 1.07%), purity (78.39 ± 0.95%), nutritional value, organic Se content (88.05 ± 0.32% of total Se content), and Se speciation distribution (selenocystine, selenomethionine, methylselenocysteine, and selenoethionine). Additionally, the antioxidant activity of different M W of Se-Bp was assessed using electron spin resonance spectroscopy. The results revealed that antioxidant activity of the candidate peptide is dependent upon its Se content, amino acid composition, and M W , especially Se-Bp with M W of 1–3 kDa displayed the strongest free radical scavenging ability.
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TALANTA
·
2024
·
IF 5.6
Xiao Jia,Jingnan Ren,Zhifeng Zhang,Nawei Zhang,Qi An,Mingzhe Li,Siyi Pan,Gang Fan,Jinchu Yang,Yingjie Feng,Zongcan Yang,Yongming Xu
ABSTRACT The non-thermal and thermal effects on aroma of sea buckthorn juice have rarely been investigated. In this study, 57 odor compounds were identified in fresh sea buckthorn juice (FSBJ), high pressure processing sea buckthorn juice (HSBJ), and pasteurized sea buckthorn juice (PSBJ), including 29 esters, 8 aldehydes, 1 ketone, 5 alcohols, 5 acids, 6 terpenoids, and 3 others. Ethyl 2-methylbutanoate, ethyl 3-methylbutanoate, ethyl hexanoate, and ethyl 2-hydroxy-3-methylbutanoate with flavor dilution factors ranging from 729 to 59049 contributed to the fruity odors of FSBJ and HSBJ. Besides, the formation of off-odor compounds including hexanal, nonanal, furfural, 3-methylbutanoic acid, and dimethyl disulfide with odor activity values ≥ 1, imparts fatty, roasted, sweaty, and cooked odor in PSBJ. The variations of vitamin C and reducing sugar are significantly associated with changes in odor-active compounds during pasteurized processing. These findings provide new insights that high pressure processing minimizes the adverse effects of pasteurization.
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Journal of Functional Foods
·
2025
·
IF 4
Miaoyunhuan Wang,Xiyue Wang,Xiaobin Li,Yuqing Dong,Jiahao Yu,Peihai Li,Rongchun Wang,Qing Xia,Kechun Liu,Houwen Lin
Chenopodium album L., is a folk potherb as well as a traditional herbal medicine, which valued for its rich material ingredients and pharmacological effects. However, its pharmacological substance basis and potential molecular mechanisms of the anti-inflammatory effect have still not been fully elucidated. The present study aims to investigate its active fractions, material basis and action mechanism of C. album to cure inflammation. First of all, C. album was extracted by 95 % ethanol, and was separated to four fractions via macroporous resin. Then we confirmed the typically anti-inflammatory active fraction CA-A with the best anti-inflammatory effect by CuSO 4 -induced inflammatory zebrafish model. Subsequently, the main components of CA-A were identified as amino acids and their derivatives and saccharides by UPLC-Q-TOF-MS. And the comprehensive evaluation of anti-inflammatory effect for CA-A indicated that CA-A inhibited inflammatory cells migration in zebrafish with a dose-dependent manner, and promote the up-regulation of IL-10 and the down-regulation of TNF-α and IL-1β. Eventually, network pharmacology and transcriptomic analysis, together with RT-qPCR verification revealed that CA-A suppressed inflammation progression by down-regulating PI3K/AKT, MAPK, and NF-κB signaling pathways and up-regulating PPAR signaling pathway. These findings offered guidance for its potential applications of C. album and provide a novel foundation for development of CA-A as functional food to inhibit inflammation.
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危险品化学品经营许可证（带存储）