ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·26394-26404
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IF 2.8
Liu Yong,Lang Jie,Wang Ting,Jawad Ali,Wang Haibin,Khan Aimal,Chen Zhulei,Chen Zhuqi
Phenylurea herbicide residuals in soil may continuously contaminate surface water and groundwater due to unregulated and improper use. Herein, we reported a stable and active oxidation system including heterogeneous Fe-based layered double hydroxide materials as persulfate (PS) activators. Under mild conditions, 1% LDH in weight and 70 mM PS can completely degrade 500 mg/kg isoproturon in soil within 10 h, during which less than 0.1 ppm heavy metal leaching was detected. This remarkable performance was consistent in a broad pH range (3~11) and was resistant to various inorganic anions (Cl − , Br − , NO 3 − , HCO 3 − ) and humic acid. Mechanism studies from scavenging tests, EPR, and fluorescence spectra collectively proved that besides •OH and •SO 4 − , singlet oxygen ( 1 O 2 ) and superoxide (•O 2 − ) were also generated and were accounted for the oxidative degradation. This unique mechanism of generating diverse radicals was clearly distinguished from classic Fe(II)/PS system, significantly reduced the influence of varying parameters in water and soil matrix, and was suggestive to chemical oxidation system in soil remediation to avoid scavenging effects by background electrolytes or other components in water/soil matrix.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-8
·
IF 5.705
Pang Jiawei,Lu Yuexiang,Gao Xinyu,Song Panshu,Yang Fengyi,Liu Yueying
A selective phosphorescent on-off-on probe with long decay lifetime has been designed for the detection of pyrophosphate ions (PPi). The detection scheme is based on the use of europium(III)-modulated Mn(II)-doped ZnS quantum dots capped with N-acetyl-L-cysteine. Both the aggregation of quantum dots and electron transfer induced by Eu(III) ions cause phosphorescence to be quenched (“off” state). Phosphorescence is, however, restored on addition of PPi to the system (“on” state). The effect is attributed to the removal of Eu(III) from the carboxy groups on the surface of the quantum dots owing to the stronger interaction between PPi and Eu(III). A linear relationship exists between phosphorescence intensity (best measured at excitation/emission wavelengths of 316/594 nm) and PPi concentration in the 400 nM to 6000 nM with a detection limit of 145 nM. An additional attractive feature is provided by the long-lived phosphorescence (1920 μs) of the quantum dots. It can be used to eliminate interference by short-lived fluorescence in biological samples by performing time resolved measurements. The probe was applied to the determination of PPi in spiked in urine samples and gave recoveries in the range from 98 to 105% with RSDs of <2.0%.
Schematic of a long-lived phosphorescent on-off-on probe for the sensitive and selective detection of pyrophosphate ions (PPi). It is based on the use of Eu(III)-modulated Mn(II)-doped ZnS quantum dots (QDs). Phosphorescence is quenched of QDs after the addition of Eu 3+ but restored after the addition of PPi.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 11
·1767-1776
·
IF 1.967
Yu Miao,Qiao Xiuying,Dong Xingjian,Sun Kang
A series of shear thickening fluids based on the modified silica nanoparticles by silane coupling agent, stearic acid, and titanate suspended in polyethylene glycol (PEG) were prepared, and the effects of particle modification on the shear thickening behaviors of these fluids were investigated. It can be found that the modification obviously decreases the particle agglomeration, improves the particle dispersion property, and increases the maximum particle concentration in fluid but leads to the reduction of the viscosity and shear thickening effect of the fluids due to the decrease of particle interactions. The modified silica fluids exhibit stronger structural recovery ability and shear thickening reversibility even after multiple shear breakage.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-6
·
IF 5.705
Cheng Ting,Jiao Zhijuan,Liu Xiaoyan,Zhang Haixia
A hybrid material was prepared from graphene oxide and melamine sponge, and modified with phenylboronic acid to obtain a sorbent for the enrichment of the nucleosides cytidine, uridine, inosine, guanosine and adenosine. The loading capacity typically is around 27.8 mg g −1 which is comparable to other sorbents, and highly selectivity for cis-diols is observed even if the concentration of potential interferents is 1500-fold higher. The sorbent was placed in an injector, and the process was operated semiautomatically by using a peristaltic pump. The sorbent is stable and can be re-used six times without decrease in efficiency. It was applied to the selective extraction of the cis -diols (cytidine, uridine, inosine, guanosine, adenosine) from HepG2 cells. It presents good linear between 3 to 5000 μg L −1 and the limits of detection (in HPLC analysis with UV detection) are 1–4 μg L −1 . Good recoveries of 85–101% were obtained with spiked HepG2 cells samples, with relative standard deviation of ≤9.9%.
Schematic for the preparation of boronic acid modified graphene oxide/melamine sponge composite for in-syringe solid-phase extraction of nucleosides.
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高影响因子
Nano Research
·
2018
·Vol. 11
·期 6
·3385-3395
·
IF 7.994
Wang Wei,Zhao Yang,Yan Bei-Bei,Dong Liang,Lu Yang,Yu Shu-Hong
Calcium carbonate-doxorubicin@silica-indocyanine green nanospheres with high uniformity and monodispersity were designed and synthesized, in order to provide a photo-triggered strategy for drug-resistant cancer therapy. Under near-infrared laser irradiation, the nanospheres transformed laser power into local heat and reactive oxygen species via the connected indocyanine green molecule, thus exhibiting photothermal and photodynamic effects. Moreover, the photo-triggered drug release based on calcium-assisted silica degradation was observed, endowing the nanospheres with chemotherapeutic properties. Finally, combined therapeutic effects against drug-resistant human breast cancer cells were successfully obtained. These photo-triggered materials based on calcium carbonate could provide a promising platform for enhanced multimodal cancer therapies.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 16
·11355-11366
·
IF 2.993
Tang Shilin,He Chuansheng,Li Dong,Cai Wenhao,Fan Louzhen,Li Yunchao
To obtain dual active near-infrared (NIR) nanomaterial with strong absorption and emission properties, we report herein a novel precursor reactivity differentiation strategy, i.e., utilizing 1-octadecene (ODE)–Se having the ability to react with Ag salts much stronger and faster than ODE–thiourea, for single-step preparation of Ag 2 Se@Ag 2 S nanocrystals (NCs). With this strategy, we were able to synthesize high-quality Ag 2 Se@Ag 2 S NCs with both excellent NIR absorption and emission properties. Particularly, these nanocrystals possess a rather strong and sharp excitonic absorption peak with a full width at half maximum less than 70 nm and a maximum fluorescence quantum yield as high as 24.3%. Their appealing optical properties and structural features were founded to be highly dependent on the Se to S precursor ratio in the reaction solutions, owing to such a ratio exerting a direct influence on the core sizes and shell thicknesses of the as-formed NCs. Taking advantage of their remarkable NIR absorption properties, self-powered photoelectrochemical-type photodetectors based on the as-prepared Ag 2 Se@Ag 2 S NCs were successfully fabricated, which demonstrate a much better response performance and photostability in comparison with those based on Ag 2 Se NCs.
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TRANSITION METAL CHEMISTRY
·
2019
·Vol. 44
·期 7
·681-688
·
IF 1.016
Wang Jun,Liu Jinyi,Chen Liduo,Lan Tianyu,Wang Libo
A series of bispyridylamine ligands and chromium complexes designed for ethylene oligomerization have been synthesized, which was made up of both neutral organic ligand and inorganic anion. The compositions of these complexes have been fully characterized by spectroscopic and analytical methods. Catalysts ( Cr1 – Cr4) were evaluated in detail with methylaluminoxane (MAO) as an activator in the ethylene oligomerization. As a result, Cr1 achieved a higher catalytic activity of 2.93 × 10 5 g/(mol(Cr) h) and a higher selectivity of 55.34% toward the valuable C 8 compound using toluene as the solvent. The total selectivity to LAOs was 71.2%.
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BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
·
2019
·Vol. 24
·期 2
·326-336
·
IF 1.438
Zhao Jiong-feng,Tao-Wang,Lin Jian-ping,Yang Li-rong,Wu Mian-Bin
Early research on the nutritional value of 1,3-diacylglycerols (1,3-DAGs) has resulted in a significant interest in their synthesis. 1,3-DAGs can be produced chemically and biologically. In this work, a regioselective lipase from Rhizopus oryzae was efficiently immobilized on nanosized magnetite particles (NSM) in an oriented way, resulting in significant enhancement of activity. The specific hydrolytic and esterification activities of the immobilized enzyme were 1,660% and 260% of those of the free enzyme, respectively. The immobilized enzyme was then used to catalyze the esterification of oleic acid with glycerol in a solvent-free system for preparation of 1,3-DAG in a 1 L reactor. The catalytic process was studied in detail, the final concentration of 1,3-DAG reached >76% under the optimal condition when the molar ratio of oleic acid to glycerol was 2.8:1. The regioselectivities of free and immobilized enzyme were both >97%. The immobilized enzyme was reused for 55 cycles with only ∼30% activity loss at 30°C. The purity of 1,3-DAG was up to ∼95% (w/w) after a simple purification step with the recovery ratio ∼85%. This is the first report of efficient 1,3-DAG purification by neutralization without acyl migration.
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Natural Products and Bioprospecting
·
2019
·Vol. 9
·期 3
·201-208
·
IF 0
Liu Qi,Chi Quan,Fan Ru-Ting,Tian Hui-Dong,Wang Xian
Abstract A sensitive and rapid high performance liquid chromatography–mass spectrometry (HPLC–MS) method was developed and validated for simultaneous quantification of ten steroid hormones, including estrogens, androgens, progesterones, and corticosteroids four classes of steroids. The following ten steroid hormones were analyzed: progesterone, 21-deoxycortisol, estrone, 4-androstenedione, testosterone, dihydro-testosterone, androstenone, dehydroepiandrosterone, corticosterone and cortisone. Stable deuterated isotopes were used as internal standards for quantification. Sample preparation with and without derivatization were performed after liquid–liquid extraction, and the corresponding results were compared according to sensitivity and selectivity. Hydroxylamine derivatization was found to improve the ionization efficiency of the analytes for electrospray ionization MS analysis. The gradient of mobile phase and experimental parameters for HPLC separation were optimized. The lower limits of quantification were in the range of 0.05–5 ng mL −1 with wide linear range for the ten steroid hormones. The intra-day precision < 11.1% and recovery of 84.5–120% with negligible matrix effect were achieved, where within the acceptance limits of the FDA guideline. Total HPLC–MS analysis time was 6 min. This method enables simultaneous quantification of steroids in human serum. It will be helpful for the serum steroid profiling in order to understand various endocrinology diseases. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23593-23602
·
IF 2.914
Zhang Xiaohan,Huang Riheng,Li Ping,Ren Yuan,Gao Jianfa,Mueller Jochen F.,Thai Phong K
Wastewater-based epidemiology (WBE) has been widely used as a complementary method for estimating consumption of illicit drugs in the population. Temporal drug consumption estimates derived from WBE can provide important information for law enforcement and public health authorities in understanding changes in supply and demand of illicit drugs, but currently lacking in China. In this study, influent wastewater samples from a municipal sewage treatment plant in Guangzhou, China were collected for 8 weeks to investigate the temporal change in consumption of six illicit drugs in the catchment. The results indicated that methamphetamine and ketamine were the dominant illicit drugs in Guangzhou with the per capita use of 14.7–470.7 mg/day/1000 people and 64.9–673.7 mg/day/1000 people, respectively. No distinct weekly patterns were observed for illicit drug consumption in Guangzhou, indicating that drug users are likely to be regular ones. Further assessment about the impact of public holidays on the consumption behavior of drugs showed little impact for ketamine ( p = 0.689), but higher consumptions of methamphetamine ( p = 0.003) and cocaine ( p = 0.027) were observed during public holidays than the control period. The considerable decrease in drug consumption observed in October 2017 compared with January and May 2017 was possibly the consequence of law enforcement action.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 16
·11243-11253
·
IF 3.442
Rao Chaohui,Guo Xia,Li Min,Sun Xiaoqing,Lian Xiaojie,Wang Huifang,Gao Xianghua,Niu Baolong,Li Wenfeng
The development of high drug loading and sustained release nanoparticles by simple and economical methods is significant for the treatment of diseases. Amorphous calcium carbonate (ACC) is an ideal drug delivery system because of its excellent pH responsiveness, biocompatibility and biodegradability. In this work, ACC nanoparticles were successfully precipitated in ethanol–calcium solutions using ammonium carbonate as the internal source of CO 2 , which exhibited a relatively narrow size distribution in range of 10–200 nm. The microscopic morphology, amorphous characters, porous structure and thermal behavior of resultants were investigated by electron microscopy, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller and thermogravimetric analysis, respectively. In vitro drug release assay showed that ACC nanoparticles had high loading capacity of curcumin (Cur) and favorable drug release properties. Furthermore, ACC-Cur showed excellent abilities to scavenge free radicals, protect Cur stability and damage A549 cells, providing a broadened space for the applications of this material in the fields of biomedical or food.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2083-2089
·
IF 1.637
Song Peng,Tu Yu,Shen Xiaoping,Yuan Aihua,Zhai Linzhi,Shah Sayyar Ali
Silk fibroin (SF) derived composites play an important role in regenerative medicine and tissue engineering fields. In this study, through a simple, yet green and sustainable approach, ZIF-8@SF composite was firstly prepared, and its morphological, structural, thermal and mechanical properties were systematically studied. After ZIF-8 feeding, no marked side effect for silkworms was found. The as-prepared composite had 3% of ZIF-8, and a maximum strain of 28%, which was 17% higher than that of the natural SF. Results from SEM, FTIR, XRD and TGA showed that the essential characteristics of SF were well inherited with ZIF-8 addition, suggesting that ZIF-8@SF had a great potential of being used in bio-relevant fields. Noticeably, this study is the first time to develop ZIF-8@SF composite, and the in vivo feeding approach is very promising for commercial production.
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