CELLULOSE
·
2015
·Vol. 22
·期 1
·329-338
·
IF 3.573
Yu Yeli,Zhang Yong,Yang Xiaogang,Liu Hongyi,Shao Lan,Zhang Xiumei,Yao Juming
A cellulose-based superabsorbent exhibits excellent water absorbency and retention performance as well as biodegradability. However, the detailed biodegradation process in soil has not been monitored yet. Yellowing is another important factor affecting its appearance and storage. In this work, cellulose from flax yarn wastes (FYW) was used as the skeleton material to synthesize a cellulose-g-P(AA-co-AM) (FYW/PAA) superabsorbent. The properties of the FYW/PAA superabsorbent were characterized, especially its biodegradation process and yellowing mechanism. The resultant FYW/PAA presented excellent water absorbency and retention capabilities of 886 g/g in deionized water and 73.2 wt% after being dried at 60 °C for 12 h, respectively. The fracturing of β-1,4-glycosidic bonds on the flax-cellulose macromolecules is the main reason for the biodegradation of FYW/PAA in soil. This causes a 70.8 wt% degradation after FYW/PAA has been buried in soil for only 60 days. The drying method and UV irradiation have important implications for the yellowing of FYW/PAA. They facilitate the generation of chromophore and auxochrome groups on the flax-cellulose macromolecules. 2,6-Di-tert-butyl-4-methylphenol (BHT) exhibits excellent antioxidant properties to inhibit the yellowing of FYW/PAA products.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2014
·Vol. 240
·期 1
·49-60
·
IF 1.387
Li Chao,Fu Xiong,Huang Qiang,Luo Faxing,You Lijun
Response surface methodology was used to optimize the ultrasonic extraction of Prunella vulgaris polysaccharides (PVP). When the quality of P. vulgaris was 4.0 g, the optimal extraction conditions were ultrasonic power 210 W, time 50 min, and temperature 70 °C. Using this condition, the experimental yield was agreed closely with the predicted value. Compared with conventional extraction, ultrasonic extraction showed a higher polysaccharide yield. The molecular weights were determined by high-performance gel permeation chromatography. Gas chromatography analysis suggested that PVP comprised of rhamnose, arabinose, xylose, mannose, glucose, and galactose with molar percentages of 2.8, 28.2, 38.5, 11.0, 3.0, and 16.5 %, respectively. The glycosidic linkage analysis showed that PVP contained 1→ and 1→6 glycosidic linkages (48.0 %), 1→2 and 1→4 glycosidic linkages (8.1 %), and 1→3 glycosidic linkages (43.9 %). PVP showed good antioxidant activities by the methods of DPPH radical scavenging assay, oxygen radical absorbance capacity assay, and cellular antioxidant activity assay. The antiproliferative activities of PVP (2.0 mg/mL) on the growth of human hepatoma HepG2, gastric carcinoma SGC 901, and human breast cancer MCF-7 cells were 51.2, 35.2, and 31.8 %, respectively. PVP did not exhibit cytotoxicity against normal liver L02 cells within the tested concentrations. These results demonstrated that polysaccharides isolated from P. vulgaris may be helpful to develop potential antioxidant and antitumor agents for food and pharmaceutical industries.
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Nanoscale Research Letters
·
2014
·Vol. 9
·期 1
·1-7
·
IF 2.481
Ji Jianwei,Wang Guan,You Xiaozeng,Xu Xiangxing
Silicon quantum dots (Si QDs) attract increasing interest nowadays due to their excellent optical and electronic properties. However, only a few optoelectronic organic molecules were reported as ligands of colloidal Si QDs. In this report, N -vinylcarbazole - a material widely used in the optoelectronics industry - was used for the modification of Si QDs as ligands. This hybrid nanomaterial exhibits different spectroscopic properties from either free ligands or Si QDs alone. Possible mechanisms were discussed. This type of new functional Si QDs may find application potentials in bioimaging, photovoltaic, or optoelectronic devices.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 22
·期 1
·555-564
·
IF 2.757
Wu Yingxin,Wu Zihao,Huang Xiongfei,Simonnot Marie-Odile,Zhang Tao,Qiu Rongliang
Effective dehalogenation by nanoscale zerovalent iron (nZVI) has been reported. In this study, the effects of Ni 2+ , Cu 2+ ions, and the nonionic surfactant Tween-80 on dechlorination of 2,2’,5,5’-tetrachlorinated biphenyl (PCB-52) by nZVI were investigated in aqueous solution. The rate of dechlorination was significantly enhanced by Ni 2+ , while Cu 2+ had a less significant catalytic effect. Ni 2+ and Tween-80 used in combination synergistically enhanced dechlorination of PCB-52 by nZVI, although the enhancement by Tween-80 was inhibitory in the presence of Cu 2+ and insignificant in the absence of both metal ions. Congener specificity in the dechlorination pathway resulted from the preferential retention of ortho-chlorine, which restricted the formation of environmentally toxic coplanar PCB congeners. The application of nZVI dehalogenation enhanced by Ni 2+ and Tween-80 is a promising technique for posttreatment of PCB-contaminated soil washing solutions.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3469-3475
·
IF 4.58
Tang Yiwei,Li Min,Gao Xue,Liu Xiuying,Gao Jinwen,Ma Tao,Li Jianrong
The paper describes the preparation of a fluorescent probe based on the use of up-conversion particles (UCPs) of the type NaYF 4 : Er, Yb and shelled with a molecularly imprinted polymer (MIP) that is specific for the antibiotic enrofloxacin. The upconverted green luminescence emitted by the UCPs upon photoexcitation at 980 nm was used to locally generate a thin MIP shell around the UCPs via photopolymerization. Enrofloxacin is used as the template, and ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent. It is found that enrofloxacin is well captured by the MIP and then quenches the fluorescence of the UCPs. Fluorescence decreases linearly in the 63 ng·L −1 to 60 μg·L −1 enrofloxacin concentration range, with a 8 ng·L −1 limit of detection. The method was applied to the determination of enrofloxacin in spiked fish samples. Recoveries ranged from 83.7 to 87.7%, with relative standard deviations between 2.0 and 5.5% (for n = 3).
Schematic of an NIR-responsive up-conversion nanoparticle probe of the NaYF 4 :Er,Yb type and coated with a MIP for fluorometric determination of enrofloxacin. The upconverted luminescence emitted by the UCPs was used to locally generate a thin MIP shell around the UCPs via photopolymerization.
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Journal of the Australian Ceramic Society
·
2017
·Vol. 53
·期 2
·287-291
·
IF 0.744
Wang Zhang,Feng Peizhong,Geng Peng,Xu Cheng,Akhtar Farid
Porous mullite materials with high porosity of 71.8–88.2% were prepared by foaming of coal gangue/Al 2 O 3 /starch composite slurry and subsequent pore structure stabilization using starch consolidation and sintering. Coal gangue was recycled to prepare porous mullite foams. Starch was used as gellant, replacing commonly used poisonous chemical and expensive animal protein additives in foaming. Sintered mullite foams exhibited tri-modal pore structure, including large-sized pores (50–300 μm) replicating gas bubbles, moderate-sized pores (~10 μm) embedded in pore walls, and small-sized pores (<5 μm) appearing among mullite crystals. The compressive strength of mullite foams was between 0.21 and 8.7 MPa with low thermal conductivity between 0.1056 and 0.3848 W/m K, indicating that porous mullite foams are candidate materials for applications in thermal insulation.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 2
·334-341
·
IF 1.113
Zhang Zhili,Yang Rendang
In the present study, nanocomposites films formed by hydroxyethyl cellulose (HEC) and graphene oxide (GO) were synthesized and characterized. Compared with pure hydroxyethyl cellulose film, the thermal stability and mechanical properties of the composite materials were significantly improved. When the graphene loading was only 1.0 wt%, the maximum weight loss temperature increased 11.14 °C. The tensile strength and Young’s modulus of HEC/GO nanocomposites films were increased by 30.28 and 75.63 % compared to the pure HEC films, with only 1.0 wt% GO. The X-ray diffraction and Fouriertransform infrared spectroscop showed that GO sheets were completely exfoliated in the HEC matrix and suggested the presence of the weak interaction between HEC and GO sheets because of large number of oxygen-containing hydrophilic functional groups on the surface and edge of GO sheets. Furthermore, the well-dispersed GO nanosheets in the films can be inferred from the SEM and Halpin-Tsai model analysis. On the other hand, the composite films showed improved barrier properties against oxygen. This simple process for preparation of HEC/GO films is attractive for potential development of high-performance films for packing applications.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3113-3119
·
IF 4.58
Cui Malin,Zhao Yuan,Wang Chan,Song Qijun
Iridium nanoparticles (IrNPs) with intrinsic oxidase-like activity were synthesized by using sodium citrate as the stabilizer and NaBH 4 as the reducing agent. The IrNPs have an average diameter of 2.5 ± 0.5 nm and exhibit excellent oxidase-like property. Under the catalytic action of the IrNPs, 3,3′,5,5′-tetramethylbenzidine (TMB) is oxidized by dissolved oxygen (DO) to form a blue product with an absorption maximum at 652 nm. The catalytic activity is ascribed to the production of superoxide anion radical (O 2 ˉ∙). The chromogenic reaction is exploited for the determination of DO. The method exhibits a wide calibration range from 12.5 to 257.5 μM of DO and a limit of detection as low as 4.7 μM. Compared to other methods, this method presented here shows improved precision and faster response time.
Iridium nanoparticles (IrNPs) stabilized by sodium citrate exhibit oxidase-like activity and can effectively catalyze dissolved oxygen (DO) by oxidizing 3,3′,5,5′-tetramethylbenzidine (TMB) to form a blue product.
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高影响因子
MACROMOLECULAR RESEARCH
·
2017
·Vol. 25
·期 2
·165-171
·
IF 1.405
Zhu Nianqing,Ye Ming,Shi Dongjian,Chen Mingqing
Innovative poly(butylene succinate) (PBS)/ Spirulina composites were fabricated by melt blending. Maleic anhydride-grafted PBS (PBS-g-MAH) was synthesized and used as a compatibilizer in the composites. Extra amount of water was added to Spirulina to ensure that it acted as a plastic during blending with PBS. The tensile strength and Young’s modulus of the composites considerably increased after incorporation of PBS-g-MAH due to better interfacial adhesion between the components and better dispersion of Spirulina in the PBS matrix, which were verified by scanning electron microscopy. Fourier transform infrared spectroscopy analysis also indicated the reaction between PBS-g-MAH and Spirulina , which resulted in improved Spirulina -PBS interaction. Differential scanning calorimetry analysis revealed that the crystallization temperature of the composites increased after addition of PBS-g-MAH, especially for the composites with higher Spirulina loading, while the PBS in compatibilized composites exhibited higher enthalpies. However, the compatibilized composites exhibited slight decreases of degradation temperature accompanied by slightly higher weight loss as indicated by thermal gravimetric analysis.
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AAPS Journal
·
2017
·Vol. 19
·期 3
·814-826
·
IF 3.423
Li Fengqiao,Mei Hao,Xie Xiaodong,Zhang Huijuan,Liu Jian,Lv Tingting,Nie Huifang,Gao Yu,Jia Lee
Lung cancer is the leading cancer and has the highest death rate. The epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) erlotinib has had a promising response in lung cancer therapy. Unfortunately, individuals with TKI-resistant EGFR mutations often develop acquired resistance against erlotinib. To overcome this resistance, in the present study, we developed liposomes anchored with anti-EGFR aptamer (Apt)-conjugated chitosan (Apt-Cs) as stable carriers to deliver erlotinib to the target. We loaded erlotinib into Apt-Cs-anchored liposomal complexes (Apt-CL-E) and characterized the physicochemistry of Apt-CL-E. The nanoparticles showed good biostability and a binding specificity for EGFR-mutated cancer cells guided by the Apt. The specific binding facilitated the uptake of Apt-CL-E into EGFR-mutated cancer cells. A cytotoxicity study showed an advantage of Apt-CL-E over their nontargeted liposomal counterparts in delivering erlotinib to EGFR-mutated cancer cells, resulting in cell cycle arrest and apoptosis. These results provide a good platform for future in vivo animal studies with Apt-CL-E.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2017
·Vol. 295
·期 4
·703-707
·
IF 1.723
Lu Wangting,Zhang Geng,Wei Feng,Li Wenhui,Cheng Kun,Ding Fei,Zhang Jiying,Zheng Wanquan
Palladium nanocrystals (NCs) are highly useful functional materials in many applications, and the performances of Pd NCs were strongly depended on the crystalline facet exposed on their surface. In this work, Pd NCs were synthesized in aqueous solutions by using Na 2 PdCl 4 as the precursor, citric acid as the capping agent, and Pluronic F127 as both stabilizer and reductant. By adjusting the reaction parameters, Pd cuboctahedrons, octahedrons, and triangular nanoplates with well-defined facets can be produced. This study provides a new pathway for the shape-controlled preparation of noble metal NCs.
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-8
·
IF 2.584
Zhang Zhiliang,He Wenxiu,Zheng Jianzhong,Wang Guangquan,Ji Jianbing
Nanofluids, colloidal suspensions consisting of base fluids and nanoparticles, are a new generation of engineering working fluids. Nanofluids have shown great potential in heat/mass transfer applications. However, their practical applications are limited by the high production cost and low stability. In this study, a low-cost agricultural waste, rice husk ash (RHA), was used as a silicon source to the synthesis of silica nanofluids. First, silica nanoparticles with an average size of 47 nm were synthesized. Next, by dispersing the silica nanoparticles in water with ultrasonic vibration, silica nanofluids were formed. The results indicated that the dispersibility and stability of nanofluids were highly dependent on sonication time and power, dispersant types and concentrations, as well as pH; an optimal experiment condition could result in the highest stability of silica nanofluid. After 7 days storage, the nanofluid showed no sedimentation, unchanged particle size, and zeta potential. The results of this study demonstrated that there is a great potential for the use of RHA as a low-cost renewable resource for the production of stable silica nanofluids.
Rice husk ash was used as a low-cost renewable resource for production of silica nanofluids with high stability.
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高影响因子
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