JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2016
·Vol. 93
·期 8
·1127-1136
·
IF 1.505
Zhang Zhen,He Caian,Zhu Ruixue,Shen Jing,Yu Yueli,Peng Qiang,Gao Jinfeng,Li Yunlong,Wang Min
Black tartary buckwheat oils (BTBOs) were extracted from five major industrial tartary buckwheat cultivars grown under similar agronomical activities and environmental conditions. These oils were characterized for the bioactive compounds containing fatty acids, β-carotene, lutein, α-, β-, δ- and γ-tocopherol, and for their antioxidant properties. The total tocopherol contents that were obtained ranged from 704.66 to 1156.19 mg/kg, with γ-tocopherol (588.98–977.91 mg/kg) as the main component. The concentration of lutein ranged from 253.14 to 429.63 mg/kg, which was almost ten times higher than that of β-carotenoid (46.71–69.2 mg/kg), indicating that black tartary buckwheat seed oils were a good source of lutein. The predominant fatty acids were unsaturated oleic acid (C18:1) (35.27–40.61 %) and linoleic acid (C18:2) (38.25–42.90 %). Excellent values of 2,2-diphenyl-1-picrylhydrazyl radical (DPPH), diammonium salt (ABTS) radical scavenging activities were obtained and the highest oxygen radical absorbance capacity (ORAC) value of 13.89 mmol Trolox equiv/g oil was detected in the variety of Chuanqiao No. 1, which was clearly separated by principal component analysis (PCA) on the basis of the highest content of tocopherols and carotenoids. Moreover, the correlation analysis showed that tocopherols and carotenoids were the major contributors to the antioxidant activities of the BTBOs. This study demonstrates that lipophilic extraction in the tartary buckwheat seed contains many interesting bioactive compounds, which are beneficial for human health.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 2
·326-332
·
IF 1.473
Ma Wenle,Feng Yongmei,Wang Li,Xue Junying,Cui Hongtao
Abstract Mn 3 O 4 nanoparticles were prepared at 60 °C in ethanol solution by a facile precipitation method. It was found that the particle size of the as-prepared Mn 3 O 4 depended on the alkalinity of precipitants. Nanoparticles with average size of 6 nm were obtained by using morpholine as precipitant which had low alkalinity, while 10 nm particles were produced by using NaOH as precipitant. The former particles presented higher degree electrochemical double-layer capacitor-like behavior and higher electrochemical performance than the latter. This could be attributed to the effective faradaic reactions of particles, which originated from the low equivalent series resistance resulting from their smaller particle size. Graphical Abstract Mn 3 O 4 nanoparticles were prepared in ethanol by a facile precipitation method using precipitants with different alkalinity. It was found that smaller particles (a) were generated by using precipitant with low alkalinity as compared with the one with higher alkalinity (b). As a result, the Mn 3 O 4 nanoparticles presented a high-degree electrochemical double-layer capacitor-like behavior due to their low equivalent series resistance.
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POLYMER BULLETIN
·
2016
·Vol. 74
·期 2
·359-367
·
IF 1.371
Wei Kun,Ma Biao,Wang Hainian,Liu Yu,Luo Yu
A series of novel epoxy polymer shell microcapsules with n -tetradecane and dimethylbenzene as binary core materials are successfully synthesized via interfacial polymerization. Dimethylbenzene is used as the solvent for epoxy and n -tetradecane. The chemical structure, surface morphology, and thermal properties of the microencapsulated phase-change materials (micro-PCMs) are characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscope. Results show that the micro-PCMs have relatively spherical profiles and smooth surfaces with diameters ranging from 10 to 70 μm. The epoxy shell successfully encapsulates the binary core. Phase-change enthalpy and binary core content in the micro-PCMs increase with the increasing mass ratio of the binary core to the epoxy resin. The micro-PCMs degrade in two steps, and the resulting microcapsules exhibit good thermal stabilities. The degradation temperature decreases, as the core-to-shell mass ratio increases.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 18
·8502-8515
·
IF 2.302
Ran Junhui,Wang Haiying,Cheng Xinjian
Fluorescent chemosensors based on silica nanoparticles and silicate glass slides were well designed and prepared. The as-prepared fluorescent silica particles and glass slides exhibited highly selective sensing and absorbing abilities to Pd 2+ ions in aqueous phase. SiO 2 nanoparticles were first synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS), and then –NH 2 groups were introduced to silica by treating with 3-aminopropyltriethoxysilane (APTES). Subsequently, 4-amino-1,8-naphthalic anhydride (ANA) was incorporated with the reaction of –NH 2 groups. Finally, salicylaldehyde (SA) was introduced by the reaction between amino groups in ANA and the –CHO groups in SA. Thus, the fluorescent silica nanoparticles were obtained. This method was expanded to prepare fluorescent silicate glass slides. Upon the addition of Pd 2+ ions, the fluorescence quenched immediately. These chemosensors were selectively sensitive to Pd 2+ ions as low as 10 μM. The absorption efficiency of fluorescent nanoparticles and glass slides for Pd 2+ reached to 38.38 and 27.50 %, respectively. And the chemosensors also could be easily recycled and reused for at least five times. Fluorescent silica nanoparticles with only ANA or SA (not ANA and SA together) also exhibited the sensing ability to Pd 2+ ions; however, it showed the shortage of Pd 2+ ions selectivity. It suggested that it is necessary to introduce both ANA and SA for the high sensitivity and selectivity to Pd 2+ ions.
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高影响因子
Journal of the Iranian Chemical Society
·
2016
·Vol. 13
·期 10
·1759-1765
·
IF 1.3
Wang Tingting,Zhang Dan,Zhang Ziliang,Han Juan,Wang Yun,Tang Xu
As a novel and green pretreatment technique to trace samples, polyoxyethylene cetyl ether (POELE20)–(NH 4 ) 2 SO 4 aqueous two-phase extraction system was coupled with high-performance liquid chromatography to analyse synchronously chloramphenicol (CAP), thiamphenicol (TAP) and florfenicol (FF) in chicken and pork samples. It was found that the extraction efficiency ( E %) and enrichment factor ( F ) of the three antibiotics were influenced by the types of salts, the concentration of salt, the concentration of POELE20, system temperature and pH. The final optimal condition was as following: the phase-forming salt is (NH 4 ) 2 SO 4 , the concentration of (NH 4 ) 2 SO 4 is 0.141 g mL −1 , the concentration of POELE20 is 0.03 g mL −1 , the temperature is 298.15 K, and the system pH is 4.5. This POELE20–(NH 4 ) 2 SO 4 ATPS was applied to separate and enrich three antibiotics in real sample under the optimal conditions, and it was found that the recovery was 97.20–102.00 % with a RSD of 0.61–4.85 %. The limit of detection for CAP, TAP and FF were 0.10, 0.50 and 0.50 μg kg −1 , and the limit of quantitation for CAP, TAP and FF was 0.15, 1.50 and 1.50 μg kg −1 . Seven times the experiments were used to verify the repeatability and veracity of this method, and the RSD for the intra-day and inter-day were 1.13–3.22 and 1.74–4.72 %.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 9
·2319-2327
·
IF 3.125
Chen Yanrong,Wang Kan,Liu Zongrui,Sun Rongjin,Cui Daxiang,He Jinghua
Rapid and quantitative detection of biomarkers with high sensitivity and specificity has become a common practice in the clinical diagnosis and treatment of cancer. Herein, a quantitative lateral flow immunoassay (LFIA) based on superparamagnetic nanoparticles (SPMNPs) was developed for detection of carbohydrate antigen 72-4 (CA72-4) in human serum. This direct and rapid method did not involve any sample preparation and was accomplished using a test strip in which a sandwich reaction was performed. Probes on the conjugate pad were prepared by coupling monoclonal antibody CC49 specific to CA72-4 onto SPMNPs. Coupled monoclonal antibody B72.3 and goat anti-mouse IgG were loaded onto a nitrocellulose (NC) membrane, serving as the test and control lines, respectively. Initially, results were evaluated by macroscopic observation. Afterwards, the magnetic signal strength of the reaction area was quantified using a magnetic assay reader (MAR). Several parameters that may influence the detection sensitivity were studied and optimized. Under optimal conditions, the proposed method was capable of detecting as low as 0.38 IU/mL of CA72-4 in 20 min and had a wide detection linearity range (0–100 IU/mL). We evaluated 100 clinical samples (70 positive and 30 negative) to assess the validity of these test strips, which exhibited high sensitivity (99 %) and specificity (97 %). The results indicated a high rate of accuracy (98.4–102 %) and a low relative standard deviation according to the average recovery test. In conclusion, the test strips based on SPMNP probes are a rapid, sensitive, and quantitative method for the detection of CA72-4 and possess great potential in point-of-care testing (POCT).
Schematic illustration of the strategy for CA72-4 detection and quantification using a superparamagnetic immunochromatographic strip
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 3
·1187-1194
·
IF 4.831
Yang Genggeng,He Zeying,Liu Xueke,Liu Chang,Zhan Jing,Liu Donghui,Wang Peng,Zhou Zhiqiang
Magnetic polymer nanospheres were prepared and used as adsorbents for the extraction of organochlorine and pyrethroid pesticides from water samples. The adsorbents were synthesized by miniemulsion polymerization of N-vinylimidazole and divinylbenzene and simultaneous encapsulation of oleic acid-coated Fe 3 O 4 nanoparticles. Following desorption with ethyl acetate, the target analytes β-hexachlorocyclohexane, δ-hexachlorocyclohexane, p,p’-DDE, heptachlor, trans-chlordan, cis-chlordan, bifenthrin, β-cypermethrin, δ-methrin, λ-cyhalothrin and esfenvalerate were determined by gas chromatography with electron capture detection. Desorption conditions, extraction times and sample volume were screened by Plackett-Burman design and optimized by Box-Behnken design. Under the optimum conditions, the organochlorines can be quantified in the 20 to 400 ng L −1 concentration range, and the pyrethroids in the 400 to 4000 ng L −1 concentration range. The recoveries of organochlorines and pyrethroids from spiked real water samples are between 77.6 and 97.3 %, with relative standard deviations between 0.9 and 10.0 %. The method for magnetic solid phase extraction described here is fast, simple and friendly to the environment.
Fe 3 O 4 nanoparticles coated with oleic acid (OA) were covered with a copolymer prepared from N-vinylimidazole (VI) and divinylbenzene (DB), and then used for magnetic solid phase extraction of organochlorine and pyrethroid pesticides. Recoveries from spiked water samples range from 77.6 to 97.3 %.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 1
·1-13
·
IF 2.101
Ma Shuzhen,Cai Qian,Lu Kailing,Liao Fan,Shao Mingwang
Abstract The bi-functional Au/FeS (Au/Co 3 O 4 ) composite was fabricated by in situ reducing Au nanoparticles onto the surface of FeS (Co 3 O 4 ). The as-prepared FeS possessed a multi-structure composed of plenty of nanoplates, which were coated by Au nanoparticles with an average size of ~47.5 nm. While the Co 3 O 4 showed a thin hexagonal sheet containing Au nanoparticles on its surface with an average size of ~79.0 nm. Both the as-prepared Au/FeS and Au/Co 3 O 4 composites exhibited excellent SERS performance, capable of enhancing the Raman signals of R6G molecules with the enhancement factor up to 1.81 × 10 6 and 7.60 × 10 4 , respectively. Moreover, Au/FeS (Au/Co 3 O 4 ) composite also has been verified to have intrinsic peroxidase-like activity, which could decompose H 2 O 2 into hydroxyl radicals and then degrade organic pollutants into small molecules. Therefore, SERS can be used to real-time and in situ monitoring the degradation process of R6G molecules, employing the Au/FeS (Au/Co 3 O 4 ) composite both as SERS substrate and catalyst. Graphical abstract SERS was used to real-time and in situ monitoring the degradation of R6G, employing the Au/FeS and Au/Co 3 O 4 composites both as SERS substrates and catalysts.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 2
·610-615
·
IF 1.408
Cui Jian Dong,Liu Rong Lin,Li Lin Bo
Cross-linked enzyme aggregates from bovine pancreatic lipase were prepared by co-aggregation of lipase and BSA (Lipase-BSA-CLEAs). The main factors in the preparation of lipase-BSA-CLEAs were optimized. The highest activity recovery was around 75% under the condition of using 1% (v/v) glutaraldehyde as cross-linker and 0.05 g/L bovine serum albumin as feeder for 2 h cross linking. The optimum temperature for both lipase-CLEAs and lipase- BSA-CLEAs was measured as 60 °C, which is 10 °C higher than that of free lipase. Moreover, the lipase-BSA-CLEAs evidenced higher thermal stability and excellent reusability in comparison with the lipase-CLEAs. Lipase-BSA-CLEAs retained more than 75% of the initial activity after eight cycles of reuse, while lipase-CLEAs only retained 20% of its initial activity. Additionally, lipase-BSA-CLEAs showed more storage stability than free lipase and lipase-CLEAs. The high stability and recyclability of lipase-BSA-CLEAs make it efficient for different industrial applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2473-2483
·
IF 2.302
Zhu Lixia,Dai Jinyue,Chen Lai,Chen Jing,Na Haining,Zhu Jin
By covalently immobilizing imidazolium ion onto molecular chain, functional polyurethane (PU) is fabricated and thus an effective way is initiated to prepare electrospun membranes with antibacterial activity. In the experiment, PUs containing imidazolium ion side group (Bmim-PUs) are synthesized through a two-step polymerization process. It includes prepolymerization of isophorone diisocyanate (IPDI) with polyester glycol and chain extension polymerization using imidazolium-based ionic diol (Bmim-OH). Then, the obtained Bmim-PUs are electrospun into fibrous membranes with a diameter of ~640 nm. After a careful assessment, antibacterial activities of electrospun membranes against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli are clearly exhibited. The antibacterial efficiency of Bmim-PUs on both bacteria species improves by 60% in comparison with PU without imidazolium ion. This research suggests a simple but effective methodology to design and fabricate ultrafine fibrous membrane with significant antibacterial activity. Moreover, the obtained fibrous membranes have widely potential applications in protective textiles, filtration, and biomedical engineering.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3768-3773
·
IF 1.798
Shen Zhengbo,Wang Xiaohui,Li Longtu
Ta-doped 0.90BaTiO 3 –0.10(Bi 0.5 Na 0.5 )TiO 3 ceramics were successfully prepared by conventional solid-state reaction method and studied to satisfy super-broad temperature stability. The effects of Ta 2 O 5 doping on the dielectric properties and microstructures were thoroughly investigated. Ta plays an important role in the formation of core–shell structure because of chemical inhomogeneity, which gives rise to the weak temperature dependence of dielectric properties. The samples with the additon of 1.5 mol% Ta 2 O 5 satisfy the X9R specification, exhibiting an optimum dielectric behavior of ε
r
~ 2100, tanδ ~ 1.6% at room temperature, which is a promising candidate material for X9R MLCC applications.
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JOURNAL OF CHEMICAL SCIENCES
·
2016
·Vol. 128
·期 12
·1879-1885
·
IF 1.085
XIA HAN,PENG ZHEN,L CUNCAI,ZHAO YAOXING,HAO JINHUI,HUANG ZHIPENG
Development of hybrid electrocatalysts with high activity and good stability is crucial for oxygen evolution reaction (OER) of water electrocatalysis. In this work, cobalt oxide (Co 3 O 4 ) nanowires loaded on carbon fiber paper (CFP) were synthesized via hydrothermal method and annealing. The as-synthesized Co 3 O 4 nanowires exhibit an enhanced catalytic activity with low onset overpotential (1.52 V vs. RHE) and a small overpotential of 330 mV for a current density of 10 mA cm −2 with a Tafel slope of 60 mV ⋅ dec −1 . In addition, the Co 3 O 4 nanowires maintain its electrocatalytic activity for at least 24 h in basic media. The enhanced performance of Co 3 O 4 nanowires/CFP can be attributed to the high conductivity of CFP, the synergistic effect of Co 3 O 4 and carbon, and high porosity of the nanowire. This study will open new possibilities for exploring water electrocatalysis.
The porous Co 3 O 4 nanowires grown on carbon fiber paper act as efficient and stable electrocatalyst for oxygen evolution reaction.
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