CyTA-Journal of Food
·
2015
·
IF 0.824
Xin-Tong Yao,Xin-Huai Zhao
Caseinate was treated by diluted HCl solution to achieve degrees of deamidation of 16.6% and 28.1%, which resulted in lower surface hydrophobicity. Two deamidated caseinates were treated by transglutaminase and glucosamine to carry out glucosamine conjugation and cross-linking, to generate two modified caseinates (glucosamine-conjugated and cross-linked deamidated caseinates). Two modified caseinates contained less glucosamine (6.9–9.8 versus 12.6 g/kg protein) and higher reactable –NH2 (0.54–0.56 versus 0.51 mol/kg protein) than the glucosamine-conjugated and cross-linked caseinate, declaring they were less glycated and less cross-linked than caseinate. Two modified caseinates had better solubility in pH 3.0–9.0, higher water- and oil-binding and emulsion stability but lower emulsifying activity than caseinate; however, they also exhibited better solubility and emulsifying activity than the counterpart. It is thus concluded that HCl-induced deamidation was powerful enough to control transglutaminase-induced glucosamine conjugation and cross-linking as well as functional properties of the treated caseinates.
研究领域:
食品科学
·
生物化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1633-1639
·
IF 2.07
Nafeesa Mushtaq,Lala Rukh Sidra,Guofei Chen,Yongmei Tang,Lubo Xu,Xingzhong Fang
A series of cardo based asymmetric polyimides containing bulky rigid naphthalimide and phthalimide groups were prepared from asymmetric monomer bishaloimide and bisphenols by solution polycondensation. Bishalo(naphthalimide-phthalimide) monomers containing different terminal leaving groups (Cl, F, NO 2 ) were synthesized, and the reactivity difference of these monomers was compared for the successful synthesis of polyimides. The inherent viscosities of the polyimides were in the range 0.51 − 0.60 dL g −1 in N -methyl-2-pyrrolidone at 30 °C. These polyimides demonstrated good organosolubility and mechanical properties with tensile strengths of 93 − 120 MPa, tensile moduli of 3.5 − 5.3 GPa and elongations at break of 2.8% − 4.3%. The polyimides showed high glass transition temperatures ( T g ) ranging from 330 to 363 °C. The 10% weight loss ( T 10% ) of asymmetric polyimides reached 436 − 500 °C in nitrogen and 417 − 476 °C in air. The water uptake of the polyimides was in the range 0.35% − 0.72%. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2018
·
IF 2.932
Fan Li,Yuanyuan Yu,Qiang Wang,Jiugang Yuan,Ping Wang,Xuerong Fan
Polydopamine (PDA) films are generally produced by spontaneous oxidation of dopamine in basic medium, which is a highly convenient method for surface modification. This method is, however, not suitable for alkaline sensitive materials, which have poor stability in alkali medium and need over-long reaction time. Herein, we compared two dopamine polymerization methods: conventional method (induced by O 2 at pH 8.5) and laccase-catalyzed method (at pH 5.5). The comparison showed that the polymerization of dopamine was greatly improved when catalyzed by laccase. The PDA film obtained from laccase-catalyzed method was more uniform and more stable compared with that obtained from the conventional method; the film was able to further react with amine-terminated molecules. As a result of laccase, ether bonds were found between dopamine units of PDA; while such bonds were not observed in film obtained from the conventional method. This work can be a basis for a better understanding of structure and property relationships of PDA coating.
研究领域:
生物化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11318-11324
·
IF 3.3
Jiazheng Zhu,Chengjie Duan,Sen Ye,Qizhong Zhang,Kun Li,Guangke He,Xiang Liu,Zhiguo Zhang
Exploring synthetic methods and catalysts that are easy to handle, highly active, and low-cost for producing industrially important chemicals is a long-term goal in both science and industry. Herein, we present a general and facile Ni-catalyzed reductive amination of aldehydes/ketones methodology using hydrazine as both nitrogen and hydrogen sources, instead of the traditionally used hydrogen gas and ammonia. The mesostructured alumina-supported Ni catalyst with a relatively high ratio of Ni0 and small-sized Ni nanoparticles plays a critical role in this transformation, resulting in 55 aldehydes/ketones successfully converting to their corresponding primary amines with 61–99% yields. This work outlines a low-cost yet robust catalytic methodology for the facile and general synthesis of primary amines for practical laboratory and industrial application.
研究领域:
有机化学
·
催化化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Li-Fen Liu,Zhi-Bin Cai,Jiang-Nan Shen,Li-Xiang Wu,Eric M.V. Hoek,Cong-Jie Gao
A novel poly(amide-urethane@imide) reverse osmosis (RO) composite membrane with chlorine-tolerant property was prepared on a polysulfone supporting film through two-step interfacial polymerization. The crosslinking agent – 5-choroformyloxyisophaloyl chloride (CFIC) was first reacted with 4-methyl-phenylenediamine (MMPD) via interfacial polymerization to get the nascent poly(amide-urethane) base membrane (CFIC–MMPD) without curing treatment. Then the resultant base membrane contacted again with the second aqueous solution containing functional secondary amine – N,N′-dimethyl- m -phenylenediamine (DMMPD) to obtain the poly(amide-urethane@imide) TFC RO membrane (MMPD–CFIC@CFIC–DMMPD). X-ray photoelectronic spectroscopy (XPS) was combined with attenuated total reflectance infrared (ATR-IR) to verify that the ultrathin polyimide film (CFIC–DMMPD) has been successfully grafted on the surface of the MMPD–CFIC base membrane. The images of scanning electronic microscopy (SEM) and atomic force microscope (AFM) showed that the poly(amide-urethane@imide) membrane has much smoother, more hydrophilic surface than the poly(amide/imide-urethane) membrane (MMPD/DMMPD–CFIC) prepared by conventional one-step interfacial polymerization of CFIC and composite MMPD/DMMPD. However, the permeation experiment revealed that the poly(amide-urethane@imide) membrane has a slight loss in both salt rejection and water flux than the poly(amide/imide-urethane) membrane and conventional commercialized polyamide membrane (MPD–TMC), but exhibits better chlorine-tolerant property due to the introduction of ultrathin polyimide film (CFIC–DMMPD) on the outmost surface of the TFC RO membrane, and the combination of IR and XPS analyses shows a good agreement with the chlorine exposure results of membranes.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2011
·
IF 2.733
Xianggang Liu,Yinghua Peng,Xiangjin Qu,Shiyun Ai,Ruixia Han,Xiangbin Zhu
A novel bio-composite film which contains multi-walled carbon nanotube (MWNT)-chitosan (Chit)/poly(amidoamine) (PAMAM) nanocomposite along with the incorporation of DNA modified Au electrode as a biosensor for determination of dopamine(DA) and uric acid (UA) under coexistence of ascorbic acid (AA) was fabricated by layer-by-layer modification. Electrochemical impedance spectroscopy (EIS) and Cyclic Voltametry (CV) were used to characterize the electrochemical properties of the modified electrodes. The biosensor was applied to detect DA and UA in the presence of AA. It not only exhibited strong catalytic activity toward the oxidation of DA and UA but also separated the originally overlapped signals of UA, DA and AA oxidation at the bare electrode into three well-defined peaks. The peak separation between AA and DA, AA and UA was 179 mV and 288 mV, respectively. In the presence of 1.0 mM AA, two linear relationships were obtained for DA over the concentration range from 0.2 to 10 μM ( R = 0.9984) and 10–100 μM ( R = 0.9957) with a detection limit of 0.03 μM ( s / n = 3). The anodic peak current of UA was also a linear relationship in the concentration range 0.5–100 μM ( R = 0.9971) with a detection limit of 0.07 μΜ. Moreover, the modified electrode surface has very good reproducibility and stability.
研究领域:
生物传感器
·
电化学分析
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材料科学
·
医学检测
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产品关联
DOI
高影响因子
ANALYST
·
2024
·
IF 3.6
Yating Rui,Qunyong Tang,Liyi Chen,Juan Pu,Wangpeng Wang,Shou-Nian Ding
Baijiu, as a traditional Chinese alcoholic beverage, carries China's rich historical and cultural heritage. Consumers experience varying levels of relaxation and pleasure after consuming different Baijiu, with the biological basis of delectation influenced by serotonin and dopamine. In this study, we prepared carbon fiber electrodes modified with surface decorated gold nanoparticles to directly measure the electrochemical response signals in the serum of mice before and after gavage different types of Baijiu. It was observed that the serum signal change in mice after consuming Baijiu Sample 1 (J1) was higher than the other two types of Baijiu. Consequently, trace flavor compounds in the Baijiu samples were detected using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography mass spectrometry (LC-MS), revealing the highest content of L-lactic acid in J1. Mice were intraperitoneally injected with 200 mg/kg of L-lactic acid. The changes in dopamine and serotonin in the serum of injected mice were monitored using a biosensor, and the results were compared with results from high performance liquid chromatography-triple quadrupole mass spectrometry (HPLC-MS). The findings confirmed that L-lactic acid could indeed stimulate both neurotransmitters' secretion in mice, suggesting that the trace components in J1 may even exhibit synergistic effects. The study contributes to a deeper under-standing of the effects of Baijiu on body and provides a scientific basis for the production and consumption of Baijiu.
研究领域:
生物化学
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神经科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 2
·440-449
·
IF 5.726
Pengqi Zhu,Jin Zhang,Jie Wang,Peng Kong,Yunwei Wang,Zhanfeng Zheng
Hydroxyl coordinated ruthenium dispersed on the surface of γ-Al2O3 can be applied to the selective oxidation of amines with light irradiation and an atmospheric pressure of O2 at room temperature. Sunlight is also an effective light source for the selective aerobic oxidation of primary amines to corresponding nitriles. The high photocatalytic activity and selectivity over Ru/γ-Al2O3 originate from the adsorption of amines and imine intermediates on the abundant surface OH groups of the photocatalyst and further formation of Ru–amide species by ligand exchange of adsorbed amines and imine intermediates with adjacent exposed active Ru sites. Light is introduced to the system successfully via the formation of Ru–amide species, which are used as the light absorption sites of the photocatalytic selective oxidation of amines. Primary amines are directly converted to corresponding nitriles via a two-step oxidative dehydrogenation process.
研究领域:
化学工程
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材料科学
·
环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Shenglin Lu,Bin Zhao,Mingxing Chen,Lei Wang,Xian-Zhu Fu,Jing-Li Luo
Hydrogen generation from water electrolysis is attempted to be one of the replacement of sources as a clean fuel with high energy density . However, its application is limited by the high overpotential of oxygen evolution reaction (OER). Herein, hydrogen fuel is obtained from waste water by replacing OER with aniline electrochemical polymerization . Compared to the OER, the potential of aniline electro-polymerization greatly decreases 1240 mV at the current density of 30 mA cm −2 even using carbon paper electrode. Moreover, the Faradaic efficiency of hydrogen production is close to 100%. The as-prepared polyaniline demonstrates good performance as electrochemical capitative materials. This work provides efficient and lower energy consumed access to co-generate hydrogen and polyaniline in a convenient step by starting from the toxic and environmental-unfriendly wastewater.
研究领域:
环境科学
·
能源科学
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 14
·期 5
·573-586
·
IF 5.364
Xinjin Yan,Meng Wei,Xu Miao,Xiaoguang Qiao,Xiaomeng Zhang,Peng Fu,Xinchang Pang,Minying Liu,Qingxiang Zhao,Shuang Chen,Zhe Cui
Luminescence of non-conjugated polymers attracts much attention due to its importance in fundamental and applied research. At present, however, the research on nonconventional luminescent polymers (NLPs) in terms of both the structure regulation and emission mechanism seems to be still in its infancy. Herein, we report for the first time that PA1212, a representative engineering plastic with the longest saturated carbon chain among commercial polyamides, is an efficient NLP, which exhibits dual emission of blue fluorescence and persistent room-temperature green phosphorescence as well as high quantum yield (∼13%). Systematic photophysical characterization demonstrates the important role played by hydrogen-bonded amide groups in the emission, and the emission intensity shows a clear linear positive correlation with the amide clusters constructed from ordered hydrogen bonds in the crystalline region. Moreover, PA1212 in the α form with linearly extended hydrogen-bonded clusters exhibits longer emission wavelengths than in the γ form, owing to the narrower band gap between the valence band maximum and the conduction band minimum. Further variable temperature fluorescence studies reconfirm the amide cluster-triggered emission (CTE) mechanism of PA1212, and show the possibility of application of fluorescence spectra in the study of polyamide aggregation states. This work not only deepens the understanding of CTE, but also provides a new strategy to regulate the luminescence of polyamides, and meanwhile, highlights the application prospects of luminescent polyamides.
研究领域:
材料科学
·
光物理学
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产品关联
DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Yujing Zhou,Jue Xu,Xiankang Fan,Zihang Shi,Wei Wang,Ming Huang,Kaiyong Yao,Hongbing Yan,Changyu Zhou,Yangyang Hu,Daodong Pan
This research sought to find a novel way to control the biogenic amines (BAs) in air-dried goose through pulsed electric field (PEF) combined with mixed bacteria fermentation. The findings indicated that Lactiplantibacillus plantarum ( L . plantarum ) PDD-1 and Lactococcus lactis subsp. lactis ( L . lactis ) JCM5805 exhibited superior monoamine oxidase (MAO) and diamine oxidase (DAO) activities and robust degradation abilities for the four BAs (putrescine, cadaverine, histamine, tyramine) across various environmental conditions (temperature, NaCl concentration, and initial pH). Subsequent investigations revealed that the mixed bacteria ( L . plantarum PDD-1: L . lactis JCM5805 at a 1:1 ratio) demonstrated a more pronounced effect on BAs reduction compared to individual starter culture, particularly for putrescine and tyramine. The study results indicated that the optimal conditions for reducing BAs in air-dried goose was an electric field strength of 0.7 kV/cm applied for 150 s, followed by air-drying for 4 d. Consequently, the total BA content in the air-dried goose decreased from 15.98 ± 1.27 mg/100 g to 7.54 ± 0.04 mg/100 g. Targeted amino acid metabolomics further defined the degradation mechanism. This study is instructive for low BAs meat processing methods.
研究领域:
食品科学
·
微生物学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Xiang Liu,Tiantian Zhao,Heming Cheng,Chaoqun Zhu,Shun Li,Ping Cui
An approach of loading nanomagnetites (NMs), obtained by in-situ synthesis, on graphite oxides (GO) or poly(amidoamine)-modified GO (pGO) was described in detail in this work. Compared with the GO-NM, the pGO-NM hybrids performed excellent catalysis on degradation of aqueous p-nitroaniline in surrounding air and aqueous medium with a mechanical agitation without light irradiations and additional hydrogen peroxides. These properties differed tremendously from those of most reported metallic oxide-GO hybrids. The catalytic decomposing of the p-nitroaniline was recorded by the successive measurements of an ultraviolet–visible spectrometer. The chemical modifications on GO were investigated with infrared and X-ray photoelectron spectrometers. The hybrids of GO-NM and pGO-NM are estimated with ultraviolet–visible spectrometer, X-ray diffraction, transmission electron microscopy, cyclic voltammetry measurements and thermogravimetric analyses. The experimental results showed that the dissolved oxygen and water were involved in the degradation, which provided solid evidences for the mechanism discussion.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）