Food Analytical Methods
·
2019
·Vol. 12
·期 7
·1674-1683
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IF 2.413
Li He,Wu Chun-Jian,Tang Xiang-Yi,Yu Shu-Juan
The 2,3-dihydro-3,5-dihydroxy-6-methyl-4(H)-pyran-4-one (DDMP), 5-hydroxymethylfurfural (HMF), furfural, and 5-methylfurfural (MF) are the components of caramel colors with intense bitterness. In this study, a practical and simple method for the simultaneous analysis of these four bitter compounds in caramel colors and beverages was proposed using high-performance liquid chromatography–diode array detector–atmospheric pressure chemical ionization–mass spectrometry (HPLC-DAD-APCI-MS). For the sample preparation, the extract efficiencies from different extract solvents and quick, easy, cheap, effective, rugged, and safe (QuEChERS) salt pockets were compared. The correlation coefficients ( R 2 ) of all analytical curves were ≥ 0.9914. The satisfactory recoveries ranged between 70.1% and 101.5%, with relative standard deviations ranged from 1.7% to 9.1%. The matrix effect was evaluated, and HMF, furfural, and MF showed signal enrichment. This method was successfully applied to the analysis of bitter compounds content in several caramel colors and beverages from a local market in China. Four compounds were found in eight samples, with concentration ranging from 0.5 to 1058.1 mg kg −1 .
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Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 2
·617-627
·
IF 1.754
Wu Guangyu,Xing Weinan
A series of colloidal Ag 3 PO 4 sphere loaded onto multi-walled carbon nanotube (CAPS-MWCNT) photocatalysts containing different mass ratio of MWCNT for the removal of RhB and phenol from waste water were synthesized. The photocatalysts were characterized by X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, thermogravimetry, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy. By SEM and TEM test, the obtained Ag 3 PO 4 form precipitated and colloidal method present different structure morphology and this showed an important effect on the photocatalytic activity. The CAPS-MWCNT photocatalysts were applied to the removal of Rhodamine B (RhB) and phenol from waste water; and the results indicated that CAPS-MWCNT sample can exhibit the high adsorption and photodegradation efficiency under visible light irradiation. For RhB, the removal efficiency of CAPS-MWCNT-4 reaches 99.8% within 50 min, of which adsorption efficiency is 76.5% within the former 30 min; for phenol, the removal efficiency of CAPS-MWCNT-4 reaches 90.6% within 110 min, of which adsorption efficiency is 14.2% within the former 30 min. The experiment results show that CAPS-MWCNT-4 has the highest removal efficiency for RhB while it presents an excellent reusability for removing phenol from waste water. The present work illustrates a new train for the design and synthesis of stable and high efficiency catalysts, applicable for the removal of various organic pollutants by adsorption and photodegradation.
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Nature Communications
·
2018
·Vol. 9
·期 1
·1-9
·
IF 12.353
Xi Guan,Sheng Lan,Du Jiahui,Zhang Jinyan,Li Minjie,Wang Hongze,Ma Yufei,Zhang Sean Xiao-An
The colour of water-jet rewritable paper (WJRP) is difficult to be expanded via single hydrochromic molecule, especially black. Here, inspired by the amazing phenomenon of bound-water in cells enabling various biological transformations via facilitating synergistic inter-/intra-molecular proton transfer, we present a simple strategy toward WJRP based on binary systems containing less-sensitive acidochromic dyes and mild proton donors (or developers). With such a binary system containing commercial black dye as the colouring agent, benzyl 4-hydroxybenzoate as the developer, and biomimetic bound-water as proton-transferring medium, we successfully achieve the long-awaited black WJRP. Printed images on such WJRP have excellent performances and long retaining time (>1 month). In addition, the robustness, durability and reversibility of WJRP could be increased distinctly by using polyethylene terephthalate as substrate. This strategy significantly expands hydrochromic colours to entire visible range in an eco-friendly way, which opens an avenue of smart materials for practical needs and industrialization.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 30
·7921-7929
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IF 3.307
Huang Mujia,He Daiping,Wang Mingzhu,Jiang Ping
High electrical conductivity and more active sites exposure are crucial for improving the performance of electrocatalyst. Binary metal oxide nanoarray grown on conductive substrate offers a 3D self-supported electrode with a great promise in boosting its performance in enzyme-free glucose sensing. Here, NiMoO 4 nanosheet arrays anchored on carbon cloth (NiMoO 4 NSA/CC) was prepared via a simple hydrothermal synthesis and used as 3D self-supported electrode for enzyme-free glucose sensing. The morphology and composition of NiMoO 4 nanosheet have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical results show that NiMoO 4 NSA/CC exhibits remarkable high catalytic activity towards glucose oxidation, with a wide linear response ranging from 1 μM to 0.9 mM, a high sensitivity of 4.13 mA/mM·cm 2 , and a low detection limit of 1 μM (S/ N = 3). The enhanced performance might be attributed to the merits of nanosheet arrays with large surface area, self-supported electrode with 3D open network, as well as bimetallic component with high conductivity. Furthermore, NiMoO 4 NSA/CC also shows good selectivity and reliability for glucose detection in human serum. This work offers a new pathway for the construction of enzyme-free glucose sensor with high performance.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 88
·期 3
·654-659
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IF 1.745
Wang Lijuan,Lv Hua,Li Binjie,Zhao Yanbao,Sun Lei
Flower-like ceria (CeO 2 ) architectures consisting of well aligned nanosheets were first synthesized by a glycol solvothermal method. The size of CeO 2 architectures is about 5 μm in width and 10 μm in length, with the nanosheets thickness below 100 nm. Subsequently, the adsorbed Ag ions on the surface of CeO 2 were in situ reduced to form Ag nanoparticles (NPs), leading to the fabrication of Ag/CeO 2 hybrid architectures (HAs). The formed Ag NPs with sizes of 20–40 nm were uniformly loaded on the surface of the CeO 2 sheets. The antibacterial properties of Ag/CeO 2 HAs against Gram-negative E. coli and Gram-positive S. aureus were evaluated by minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and a filter paper inhibition zone method. The results demonstrated that Ag/CeO 2 HAs displayed excellent antibacterial activity toward S. aureus and E. coli , which were attributed to the synergistic antibacterial effect between Ag NPs and CeO 2 in HAs . Here, CeO 2 nanoflowers as a new substrate could restrict Ag NPs aggregations and improve their antibacterial activities. Therefore, the resulted Ag/CeO 2 HAs would be considered as a promising antibacterial agent.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 2
·1654-1664
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IF 2.993
Wang Linyu,Peng Canwei,Yang Han,Miao Longfei,Xu Lijuan,Wang Li,Song Yonghai
A novel Ni@carbon nanocomposites/three-dimensional kenaf stem-derived macroporous carbon (3D-KSCs)-integrated electrode was prepared by calcinating Ni-benzenetricarboxylic acid (Ni-BTC) metal–organic frameworks (MOFs) grown on 3D-KSCs under N 2 atmosphere for electrochemical glucose sensor. Both Ni-BTC MOFs/3D-KSCs and Ni@carbon nanocomposites/3D-KSCs-integrated electrode were studied by scanning electron microscopy and X-ray powder diffraction. These results showed that many flowerlike Ni-BTC MOFs which were composed of sticklike nanostructures were grown on the surface of 3D-KSCs. After calcination under N 2 atmosphere, lots of pearl chain-like nanostructures were formed and uniformly arrayed on 3D-KSC electrode. XRD results confirmed that the Ni-BTC MOFs were successfully transformed into pearl chain-like Ni@carbon nanocomposites. Both electrochemical behaviors and electrocatalytic performances of Ni@carbon nanocomposites/3D-KSCs-integrated electrode were explored. Thanks to its large specific surface area, 3D macropores and special structures, the Ni@carbon nanocomposites/3D-KSCs-integrated electrode showed wide linear range (0.024–1.2 mM) and low detection limit (7.85 μM, S / N = 3) for glucose sensing. Noteworthily, the MOFs/3D-KSCs might be proposed to prepare other nanocomposites for electrochemical biosensing.
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CELLULOSE
·
2018
·Vol. 26
·期 3
·1683-1701
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IF 3.809
Ru Jing,Tong Congcong,Chen Ning,Shan Pengjia,Zhao Xingke,Liu Xuying,Chen Jinzhou,Li Qian,Liu Xiaohuan,Liu Hongzhi,Zhao Ying
Abstract In this work, quaternized nanofibrillated cellulose (Q-NFC) was isolated from bamboo bleached kraft pulp through the pre-treatment using 2, 3-epoxy-propyltrimethylammonium chloride (EPTAC) in an aqueous alkaline media and subsequent high-pressure homogenization. A series of aqueous Q-NFC dispersions with different contents of positively charged trimethylammonium groups on the surfaces of fibrils were obtained. With the amount of added EPTAC increased, the solid recovery ratio, surface charge contents, zeta potential values, and extent of nanofibrillation gradually increased for the as-obtained Q-NFCs. TEM images of Q-NFCs revealed that the incorporation of quaternary ammonium groups contributed to the defibrillation into finer nanofibrils with more uniform width distribution. With an increase in the positive charge contents, both degree of polymerization and decomposition temperature of the Q-NFC films decreased slowly. Steady-state rheological result demonstrated that the maximum shear viscosity was achieved for the Q-NFC0.6 dispersion with the medium charge content. The Q-NFC films with higher charge content displayed superior transparency and tensile strength. Furthermore, the oxygen transmission rate of PLA films was remarkably decreased dramatically from 216.0 to 10.3 mL m −2 day −1 after laminating a thin layer of Q-NFC0.6 on the one side. As compared to TEMPO-oxidized NFC from the same pulp, the surface-charged Q-NFC exhibited higher optical transmittance, shear viscosity, and thermal stability as well as comparable oxygen-barrier properties. Graphical abstract
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-14
·
IF 3.125
Wang Rui,Wu Lixin,Zhuo Dongxian,Wang Zhengzhou,Tsai Tsung Yen
A C 60 -PEI-rGO hybrid was prepared by incorporating the fullerene (C 60 ) on the surface of PEI-modified reduced graphene oxide (rGO) and then used to modify the epoxy (EP) resin. Subsequently, the structure of GO and C 60 -PEI-rGO hybrid were well characterized, showing that the C 60 was homogenously anchored on the surface of PEI-rGO. The flame retardancy, mechanical properties, and thermal stability of as-prepared C 60 -PEI-rGO/EP nanocomposites were systematically investigated. Results show that the C 60 -PEI-rGO hybrid exhibits high flame retarding efficiency for EP. Specifically, the time to ignition of epoxy increases from 68 to 89 s with the addition of 1.0 wt% C 60 -PEI-rGO, which are unusual in polymer nanocomposites. In the meantime, the peaks of the heat release rate and total heat release of the modified epoxy reduce by 40.0% and 15.6%, respectively. The synergistic flame retardant mechanism of C 60 -PEI-rGO to EP is attributed to its unique structure combining both the high efficiency in capturing free radicals by C 60 , the barrier effect of layered of rGO and increase of crosslinking density of epoxy. It is shown that the thermal stability and mechanical properties of epoxy are simultaneously improved with the addition of C 60 -PEI-rGO. This work may pioneer a new and efficient method to fabricate fire retardant thermosetting resins with simultaneously other improved properties.
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CELLULOSE
·
2018
·Vol. 25
·期 11
·6771-6792
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IF 3.809
Shi Wei,Liu Shi-Qi,Sun Jian-Ping,Long Jia-Jie
Abstract A novel and environmentally-friendly strategy for integrated bio-treatment (namely the biodesizing and bioscouring) of grey cotton in one-step to degrade and/or remove impurities was constructed on the basis of catalytic reactions from mixed enzymes, by employing reverse microemulsion in supercritical carbon dioxide fluid (SCF-CO 2 ) media as an alternative to heavily polluting wet-chemical processes. Moreover, a subsequent supercritical washing procedure was also involved. Then the proposed strategy was further explored and characterized by the observation of the formation of reverse microemulsion, impurity removal efficiency and wickability of the treated substrate, the results of static water contact angle measurements, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. The results demonstrate that an efficient degradation and/or removal of various impurities could be achieved by the proposed strategy from grey cotton with enhanced properties. A successful formation of microemulsion for transfer of enzymes into supercritical carbon dioxide was observed with the presence of an emulsifying agent of sodium bis (2-ethylhexyl) sulfosuccinate (AOT) and the auxiliary of ethanol. The efficiency of impurity removal could also be improved at an appropriate system temperature and composite enzyme dosage, as well as by a subsequent washing in SCF-CO 2 media. Furthermore, the results of the static water contact angle measurement, XPS spectra and SEM analysis further confirmed the feasibility, validation and reliability of the constructed strategy. Additionally, an integrated removal mechanism was also proposed for impurity degradation and/or removal from grey cotton, with mixed enzymes transferred by reverse microemulsion in supercritical carbon dioxide media. Graphical abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 9
·1-10
·
IF 2.127
Li Dong,Fang Minjie,Jiang Chunli,Lin Hechun,Luo Chunhua,Qi Ruijuan,Huang Rong,Peng Hui
Bismuth selenide (Bi 2 Se 3 ) has attracted great attention as one of typical topological insulator materials. In this work, size-controllable Bi 2 Se 3 nanoflowers (NFs) composed of numerous thin nanosheets are successfully synthesized by a hot-solution injection method under mild conditions. The structure and morphology of the obtained Bi 2 Se 3 NFs are characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopic (EDS), and selected area electron diffraction (SAED) techniques. The reaction temperature, time, and surfactant ratio (oleylamine/oleic acid) affect the phase purity and morphology of Bi 2 Se 3 samples. Based on the experimental results, the formation mechanism of Bi 2 Se 3 nanoflowers is proposed. Meanwhile, the photocatalytic behavior of the as-prepared Bi 2 Se 3 nanoflowers in the presence of H 2 O 2 is explored and it is found that the degrading rate of RhB can reach 93% after 2 h visible light irradiation.
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CELLULOSE
·
2018
·Vol. 25
·期 10
·5687-5696
·
IF 3.809
Liu Shaojie,Sun Tingting,Yang Desheng,Cao Meng,Liang Huazhe
Abstract Water-soluble polyacrylic acid was prepared by solution polymerization, and then partially acylated by SOCl 2 to give a random copolymer of poly(acrylic acid- co -acryloyl chloride) (P(AA- co -AC)). Through the reaction of acyl chloride groups in P(AA- co -AC) with hydroxyl groups in 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxy (4-OH-TEMPO), the water-soluble TEMPO immobilized copolymer of poly(acrylic acid- co -2,2,6,6-tetramethylpiperidinyloxy-4-yl-acrylate) (P(AA- co -TA)) with different TEMPO loadings were prepared and characterized by Fourier transform infrared spectroscopy and conductometric titration. P(AA- co -TA) was used as a recoverable catalyst instead of free TEMPO for selective catalytic oxidation of cellulose in water. The carboxyl content of oxidized cellulose with P(AA- co -TA) as catalyst was up to 60% of the free TEMPO level. Furthermore, P(AA- co -TA) was easy to recycle by its pH-sensitivity and the activity did not decrease after 4 cycles. Graphical abstract
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RHEOLOGICA ACTA
·
2018
·Vol. 57
·期 10
·619-633
·
IF 1.833
Zheng Zhi-Ying,Li Feng-Chen,Wang Lu,Li Xiao-Bin,Zhang Hong-Na,Cai Wei-Hua,Zheng Xin
The rheological properties of seawater with the addition of surfactant additive (cetyltrimethyl ammonium chloride (CTAC)/sodium salicylate (NaSal)) are measured at different temperatures, including shear viscosity and first normal stress difference ( N 1 ). The effects of the temperature, the salts, and CTAC/NaSal concentration on the rheological properties of test solutions are investigated, and the corresponding influence mechanisms are analyzed. It shows that the addition of salt can decrease the shear viscosities of the solutions, and also decrease N 1 and even eliminate the sharp augment of N 1 above a certain shear rate. The growing elasticity can be characterized by the increase of the initial shear rate for shear-thickening inception. High temperature can also remove the sharp increase of N 1 with salt. Nevertheless, the increase of CTAC/NaSal concentration can withstand the elimination of the sharp augment of N 1 .
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