EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2016
·Vol. 243
·期 2
·203-214
·
IF 1.433
Liu Tao,Zhu Wei,Huang Jing,Chen Huahan,Nie Rongzu,Li Chun-mei
The influence of the planting season on the nutritional as well as the aromatic composition of Hezuo 903 tomato was investigated by combining use of nutrition analysis, sensory evaluation, electronic nose and electronic tongue analysis, gas chromatography–mass spectrometry (GC–MS) and GC–MS–olfactometry (GC–MS–O) method. The results suggested that in-season tomato contained higher levels of reducing sugar, vitamin C and lycopene than off-season tomato. In-season tomato showed a better overall flavor and acceptability than off-season tomato. Significant difference was observed in both composition and concentration of the typical volatile and aroma-active compounds in two samples. E-2-Hexenal and methyl salicylate were only found in off-season tomato, and phenylacetaldehyde detected merely in in-season tomato. In addition, significantly higher levels of 6-methyl-5-hepten-2-one ( P < 0.01) and 2-isobutylthiazole ( P < 0.01) were detected in off-season tomato than in-season tomato, which showed a negative effect on the overall flavor of tomato. Our result indicated that the planting season affected the composition and concentration of both non-volatile and volatile compounds of tomato fruit.
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Food Analytical Methods
·
2017
·Vol. 10
·期 9
·3042-3051
·
IF 2.038
Tian Wenhao,Zhang Xiaoxiao,Song Meirong,Jiang Haiyang,Ding Shuangyang,Shen Jianzhong,Li Jiancheng
Polyether antibiotics have been widely used for the treatment and prevention of coccidiosis in chicken farming. In the present study, an efficient, simple and inexpensive competitive indirect enzyme-linked immunosorbent assay (ciELISA) method based on immunomagnetic sample clean up was developed for salinomycin. Monoclonal antibodies were immobilized on the surface of carboxylic acid magnetic beads (2.8 μm in diameter). After a simple extraction, residues in sample extracts were specifically adsorbed and the supernatant removed by magnetic separation. Analytes retained on the beads were then released by elution prior to ciELISA. The limit of detection for salinomycin in chicken muscle and liver was 22 and 18 ng mL −1 , respectively, and the linear quantitative range was 47–653 ng mL −1 . Intra-assay recoveries ranged from 86.00 to 99.32%, and inter-assay recoveries were between 85.68 and 96.34%. The inhibition efficiency and sensitivity of this method was improved compared with traditional hydrophilic-lipophilic balance column clean up ciELISA. Furthermore, the convenience and repeatability of the immunomagnetic cleanup renders the new method of high value for the analysis of drug residues in complex matrices.
The test method of schematic diagram
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 12
·11549-11558
·
IF 2.741
Zhou Lei,Zhang Ya,Ying Rongrong,Wang Guoqing,Long Tao,Li Jianhua,Lin Yusuo
The widespread occurrence of organophosphorus pesticides (OPPs) in the environment poses risks to both ecologic system as well as human health. This study investigated the oxidation kinetics of chlorpyrifos (CP), one of the typical OPPs, by thermoactivated persulfate (PS) oxidation process, and evaluated the influence of key kinetic factors, such as PS concentrations, pH, temperature, bicarbonate, and chloride ions. The reaction pathways and mechanisms were also proposed based on products identification by LC-MS techniques. Our results revealed that increasing initial PS concentration and temperature favored the decomposition of CP, whereas the oxidation efficiency was not affected by pH change ranging from 3 to 11. Bicarbonate was found to play a detrimental role on CP removal rates, while chloride showed no effect. The oxidation pathways including initial oxidation of P=S bond to P=O, dechlorination, dealkylation, and the dechlorination-hydroxylation were proposed, and the detailed underlying mechanisms were also discussed. Molecular orbital (MO) calculations indicated that P=S bond was the most favored oxidation site of the molecule. The toxicity of reaction solution was believed to increase due to the formation of products with P=O structures. This work demonstrates that OPPs can readily react with SO 4
·− and provides important information for further research on the oxidation of these contaminants.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 6
·1-6
·
IF 1.444
Jin Liguo,Liu Taiyang,Wang Chao
Composite ionic gel electrolytes were facilely prepared by mixing ionic gel electrolytes with SiO 2 nanoparticles. The dye-sensitized solar cells (DSSCs) assembled with the composite ionic gel electrolytes exhibit the higher photovoltaic performance and better durability compared to the original DSSCs based on pure ionic gel electrolytes. In particular, the DSSC assembled with the electrolytes containing 0.15 g of SiO 2 shows superior J
SC (14.4 mA cm −2 ), V
OC (0.67 V), fill factor (0.69) and power conversion efficiency (6.71 %) (measured at AM 1.5, light intensity of 100 mW/cm 2 ). The electrochemical impedance spectra, SEM and conductivity were used to characterize the composite ionic gel electrolytes.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 7
·901-909
·
IF 1.811
Cui Bin,Wu Qing-Yun,Gu Lin,Shen Liang,Yu Hai-bin
In this work, a series of high performance bio-based polyurethanes (bio-PUs) were synthesized from polylactide (PLA)-based diols, different diisocyanates (TDI, MDI, HDI, IPDI) and chain extender 1,4-butanediol, in which different soft and hard segments are used to adjust their transition temperatures and mechanical properties. Poly(lactide- co -caprolactone) copolymer diols ( co -PLAols) instead of PLA diols as the soft segment improved the thermal stability and mechanical properties of the synthesized bio-PUs. Among them, MDI-based bio-PUs have the highest T
g (43.8 °C), tensile strength (23.5 MPa) and modulus (380.8 MPa), while HDI-based bio-PUs have the lowest T
g (21.4 °C) and highest elongation at break (580%). Especially, the bio-PUs synthesized from co -PLAols and MDI demonstrate better mechanical properties, closed to petroleum-based commodities. Furthermore, the obtained bio-PUs display good shape memory properties at body temperature and cytocompatibility. Therefore, these bio-PUs are promising for applications in biomedical fields.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 9
·9278-9285
·
IF 1.798
Liu Ziyu,Xu Guangliang,Zhang Ming,Xiong Kun,Meng Pingyuan
Cobalt ferrite/reduced graphene oxide (CoFe 2 O 4 /RGO) nanocomposites were initially prepared by the interaction of alkyne-functionalized CoFe 2 O 4 NPs and azide-functionalized graphene oxide (GO–N 3 ) via the Cu (I)-catalyzed click reaction. The morphology and structure of CoFe 2 O 4 /RGO were investigated by means of XRD, FTIR, TGA, TEM, SEM and the electromagnetic parameters were measured by vector network analyzer. For CoFe 2 O 4 /RGO composites with click reaction, the minimum reflection loss could reach −40 dB at 6.8 GHz with a matching thickness of 4.0 mm, and also it had a bandwidth below −10 dB ranging from 5.8 to 8.5 GHz. The CoFe 2 O 4 /RGO composites with click reaction exhibited better microwave absorbing performance than the physical mixture. Furthermore, the covalent ligation between CoFe 2 O 4 NPs and graphene oxide could make the composites have a promising future in electromagnetic wave absorption materials.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 16
·7669-7677
·
IF 2.302
Ju Xiuping,Liu Xiaofang,Gao Xuejia,Niu Libo,Feng Wenhui,Bai Guoyi
A novel magnetic mesoporous four-layer core–shell nanocomposite Fe 3 O 4 @nSiO 2 @ZrO 2 @Ni–Co–B was successfully fabricated by the combination of a modified Stöber sol–gel and self-assemble method. A facile template-free approach was employed to introduce the zirconia shell, which was more efficient than the conventional surfactant-templating method for the introduction of the mesoporous silica shell. This nanocomposite was composed of a ferroferric oxide core, an inner dense silica shell and a mesoporous zirconia shell in sequence and an outer Ni–Co–B amorphous alloy shell, as demonstrated by transmission electron microscope, X-ray energy dispersive spectroscopy, and nitrogen adsorption–desorption. It exhibited excellent catalytic performance in the selective hydrogenation of cinnamic acid to hydrocinnamic acid with almost 100 % yield. Additionally, it can be easily separated from the reaction mixture by using an external magnetic field due to its proper magnetic property and recycled effectively for five consecutive runs, making it an attractive candidate in efficient hydrogenations.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2016
·Vol. 100
·期 17
·7639-7650
·
IF 3.376
Raza Waseem,Wang Jichen,Wu Yuncheng,Ling Ning,Wei Zhong,Huang Qiwei,Shen Qirong
The production of volatile organic compounds (VOCs) by microbes is an important characteristic for their selection as biocontrol agents against plant pathogens. In this study, we identified the VOCs produced by the biocontrol strain Bacillus amyloliquefaciens T-5 and evaluated their impact on the growth and virulence traits of tomato bacterial wilt pathogen Ralstonia solanacearum. The results showed that the VOCs of strain T-5 significantly inhibited the growth of R. solanacearum in agar medium and in soil. In addition, VOCs significantly inhibited the motility traits, root colonization, biofilm formation, and production of antioxidant enzymes and exopolysaccharides by R. solanacearum . However, no effect of VOCs on the production of hydrolytic enzymes by R. solanacearum was observed. The strain T-5 produced VOCs, including benzenes, ketones, aldehydes, alkanes, acids, and one furan and naphthalene compound; among those, 13 VOCs showed 1–10 % antibacterial activity against R. solanacearum in their produced amounts by T-5; however, the consortium of all VOCs produced on agar medium, in sterilized soil, and in natural soil showed 75, 62, and 85 % growth inhibition of R. solanacearum , respectively. The real-time PCR analysis further confirmed the results when the expression of different virulence- and metabolism-related genes in R. solanacearum cells was decreased after exposure to the VOCs of strain T-5. The results of this study clearly revealed the significance of VOCs in the control of plant pathogens. This information would help to better comprehend the microbial interactions mediated by VOCs in nature and to develop safer strategies to control plant disease.
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Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Zhang Jingyi,Feng Anni,Bai Jie,Tan Zhibing,Shao Wenyao,Yang Yang,Hong Wenjing,Xiao Zongyuan
The synergetic effect of alloy and morphology of nanocatalysts play critical roles towards ethanol electrooxidation. In this work, we developed a novel electrocatalyst fabricated by one-pot synthesis of hierarchical flower-like palladium (Pd)-copper (Cu) alloy nanocatalysts supported on reduced graphene oxide (Pd-Cu (F) /RGO) for direct ethanol fuel cells. The structures of the catalysts were characterized by using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectrometer (XPS). The as-synthesized Pd-Cu (F) /RGO nanocatalyst was found to exhibit higher electrocatalytic performances towards ethanol electrooxidation reaction in alkaline medium in contrast with RGO-supported Pd nanocatalyst and commercial Pd black catalyst in alkaline electrolyte, which could be attributed to the formation of alloy and the morphology of nanoparticles. The high performance of nanocatalyst reveals the great potential of the structure design of the supporting materials for the future fabrication of nanocatalysts.
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JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
·
2017
·Vol. 44
·期 9
·1313-1324
·
IF 2.81
Wu Chao,Xu Peilun,Xia Yinfeng,Li Wei,Li Sujing,Wang Xiangqian
Engineered microbial ecosystems in bioscrubbers for the treatment of volatile organic compounds (VOCs) have been complicated by complex VOC mixtures from various industrial emissions. Microbial associations with VOC removal performance of the bioscrubbers are still not definitive. Here, one- and two-phase partitioning airlift bioreactors were used for the treatment of a complex VOC mixture. Microbial characteristics in both bioreactors were uncovered by high-throughput metagenomics sequencing. Results showed that dominant species with specialized VOC biodegradability were mainly responsible for high removal efficiency of relative individual VOC. Competitive enzyme inhibitions among the VOC mixture were closely related to the deterioration of removal performance for individual VOC. Relative to the mass transfer resistance, the specialized biodegrading functions of microbial inoculations and enzymatic interactions among individual VOC biodegradation also must be carefully evaluated to optimize the treatment of complex VOC mixtures in bioreactors.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 11
·4417-4424
·
IF 4.58
Qu Fei,Liu Yining,Kong Rongmei,You Jinmao
The authors report that the fluorescence of polymer-capped silver nanoclusters (AgNCs) is quenched by MoS 2 nanosheets. However, in the presence of electrolytes such as sodium acetate (50 mM), the nanosheets tend to aggregate, and this causes fluorescence to be restored. If, however, ssDNA is added, it will be adsorbed on the surface of the MoS 2 nanosheets and stabilize them against aggregation. As a result, the emission of the AgNCs (best measured at excitation/emission wavelengths of 375/455 nm) is quenched again. If complementary oligonucleotide is added, a dsDNA will be formed that does no longer prevent aggregation and fluorescence is restored. Similarly, if an aptamer is adsorbed on the MoS 2 nanosheets and its substrate is then added to form a folded state, the fluorescence of the AgNCs also will be restored. As a proof of concept, the DNA sequences of hepatitis B virus and of a dopamine-selective aptamer were chosen as models. The resulting assays have low detection limits and linear ranges that extend from 5 to 30 nM for hepatitis B DNA, and from 0.3 to 1 μM for dopamine. In our perception, this method represents a universal platform for the detection of analytes for which complementary oligomers or aptamers are available.
The blue fluorescence of AgNCs is quenched by MoS 2 nanosheets. MoS 2 nanosheets possess different affinity toward single-stranded DNA (ssDNA) versus double-stranded (dsDNA) and folded DNA. Based on this, multiple targets can be detected through changing the sequence of ssDNA.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 82
·期 3
·718-727
·
IF 1.575
Wei Heng-yong,Li Hui,Cui Yi,Sang Rong-li,Wang He-yang,Wang Peng,Bu Jing-long,Dong Gui-xia
Abstract Mullite nanofibres with excellent flexibility and high temperature resistance were fabricated by electrospinning method using the nonhydrolytic sol as a precursor. The nonhydrolytic mullite sol exhibited favourable organosolubility and spinnability, due to the residual organic groups in gel particles. The thermal decomposition behaviour, crystallisation development and microstructure evolution of electrospinning precursor fibres were investigated. Results showed that the flexible mullite nanofibres with smooth surface, uniform diameter and small crystal grain size were obtained after the precursor fibres were calcined at 1000 °C for 1 h. In addition, the results also revealed that the mullite nanofibres calcined at 1500 °C still maintained their general fibrous morphology, and thereby they had the potential application in high-temperature industrial and aerospace field. Graphical Abstract
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危险品化学品经营许可证（带存储）