APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Zhanying Ma,Cong Zeng,Linlin Hu,Qing Zhao,Qian Yang,Jinfen Niu,Binghua Yao,Yangqing He
In this paper, a highly efficient photocatalyst of ZnTCPP sensitized g-C 3 N 4 was successfully constructed via a facile thermal polycondensation method. The FT-IR and XRD data indicated that ZnTCPP molecules were successfully condensed on the surface of g-C 3 N 4 through amide groups as the bridging units. The optimum 10%ZnTCPP/g-C 3 N 4 composites exhibits excellent enhanced photocatalytic activity for decomposing both methylene blue (MB) and tetracycline (TC) under visible light with long-term reusability and elimination rates of 96% and 80.3%, respectively. The superior visible light photocatalytic performance was mainly attributed to the highly efficient separation of electron-hole pairs and the enhanced solar light utilization, as demonstrated by photoluminescence (PL), electrochemical impedance spectra (EIS), photocurrent responses, and UV–vis diffuse reflectance spectroscopy (DRS). The active species trapping and terephthalic acid (TA) fluorescence experiments indicated that OH was the dominating reactive oxidizing species for TC degradation. Furthermore, the possible photocatalytic degradation pathways for MB and TC have been proposed based on the UPLC-MS spectrometry . The excellent degradation efficiency of ZnTCPP/g-C 3 N 4 reveals that it has great potential as photocatalysts for practical application to eliminate recalcitrant organic contaminants.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
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IF 1.911
Xiaoyan Zheng,Dong Feng,Liangrong Yang,Junfeng Hui,Jiemiao Yu,Qiyu Meng,Huizhou Liu,Daidi Fan
Mild stir-assisted membrane dispersion extraction (MDE) method was employed to enhance propionic acid (HA) extraction and compared to the mechanical stirred extraction (MSE) method. Triocylamine (TOA) and tributyl phosphate (TBP) were chosen as model extractant to extract HA. Firstly, droplet size and the size distribution of organic phase were analyzed, and then the effects of phase ratio, extractant and HA concentration on extraction performance were investigated. Comparing the two extraction methods, the results show mild stir-assisted MDE method reduced the mass transfer equilibrium time compared to MSE method. The mass transfer mechanism was explored by analyzing mass transfer resistance. Mild stir-assisted MDE had less total mass transfer resistance than MSE. When the extractant concentration was 40%, the extraction process was controlled by organic phase mass transfer process with HA volume fraction was 1% and controlled by both of reaction process and organic phase mass transfer process when HA concentration increased to 5%. This work may provide a new type of extraction method for the recovery of organic carboxylic acid .
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Journal of Functional Foods
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2019
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IF 3.197
Sen Li,Wenwen Yu,Xiao Guan,Kai Huang,Jing Liu,Dandan Liu,Ruiqian Duan
To evaluate the hypolipidemic effects of millet, we investigated the function of millet ethanol extract and whole grain millet on lipid metabolism by in vitro and in vivo models in this study. Results showed that millet ethanol extract significantly decreased lipid accumulation, total cholesterol and triglyceride levels in cells. Millet supplementation dramatically decreased total cholesterol levels, altered lipid profiles, and down-regulated the expression of genes SREBP-1C, FAS, HMGCR that related to hepatic lipid metabolism in rat fed with high fat diet (HFD). In addition, we also examined the level of short-chain fatty acids (SCFAs) and the composition of gut microbiota in rats. SCFAs including acetate, propionate and butyrate were increased in millet supplemented HFD rat cecum. High dose millet supplementation decreased the population of Firmicutes and increased Actinobacteria. In conclusion, our findings suggested that millet may exhibit hypolipidemic effect by regulating lipid metabolism related genes expression or gut microbiota composition.
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MOLECULAR NUTRITION & FOOD RESEARCH
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2019
·Vol. 63
·期 14
·1801363
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IF 4.653
Shanshan Zhang,Haijuan Hu,Wanying He,Zafarullah Muhammad,Lufeng Wang,Fengxia Liu,Siyi Pan
Scope The prebiotic regulation of the gut microbiota is a promising strategy to induce protective humoral and mucosal immune responses. The potential immune-improving effects of pectin oligosaccharides (POS) in healthy mice and the potential mechanism mediated by specific intestinal bacteria are investigated. Methods and results POS is prepared using a hydrogen-peroxide-assisted degradation. Mice that consumed diets containing POS are tested for microbial community shifts, short-chain fatty acids (SCFAs), and immunoglobulin (Ig) production using quantitative real-time polymerase chain reaction, gas chromatography, and ELISA kits. Pearson's correlation analyses are performed between Ig production and specific intestinal bacteria or SCFAs. POS treatment significantly improves the growth of healthy mice. Moreover, 4-week POS administration results in a profound change in intestinal microbial composition and a significantly higher fecal concentration of acetate, which leads to substantial increases of the levels of fecal secretory immunoglobulin A and serum IgG. Conclusions The results suggest that the inclusion of POS in a diet can increase Ig production and optimize the composition of the gut microbiota. A significant correlation is observed between changes in Ig production and specific intestinal bacteria or acetate, providing insight into the mechanism of POS as a potential immune-enhancing supplement.
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PubMed
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APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Yongshun Gao,Shuo Zhang,Wenlong Hou,Huiyun Guo,Qizhe Li,Danyang Dong,Siyu Wu,Shiyuan Zhao,Haiquan Zhang
Sb 2 S 3 /perylene diimide derivatives composite micro-spheres composed of slight dendrites were synthesized by solvothermal reaction. Perylene diimide derivative with two carboxyl groups at amine position as morphology-controlling reagent is the key factor for determining the microscopic morphology of Sb 2 S 3 in this system. Time-dependent experiments have been conducted to track the formation of Sb 2 S 3 micro-spheres. Moreover, the composite material showed an excellent sensitivity of 29.8 μA mM −1 cm 2 with a low detection limit of 50 pM, it also showed better stability and selectivity in hydrazine detection. This approach not only regulate the morphology and composition of Sb 2 S 3 submicron materials effectively, but also provide new ideas for the manufacture of metal sulfide- perylenediimide amino acid derivative materials, which will be suitable for sensing, catalysis, and photovoltaic applications.
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ACS Catalysis
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2019
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IF 12.221
Mengrui Zhang,Vikram Singh,Xuefu Hu,Xinyi Ma,Jingkun Lu,Chao Zhang,Jingping Wang,Jingyang Niu
Design and synthesis of high-performance heterogeneous catalysts are of immense interest in chemical industries. Herein, ultrafine H2O coordinated WOx nanoparticles (H2O–WOx, average diameter 2.24 nm) embedded into porous carbon matrix have been obtained via space-confinement pyrolysis with postmodification oxidation approach. The synthesized H2O–WOx nanoparticles exhibit high activities toward olefin epoxidation reaction using H2O2 as oxidant. In epoxidation of cis-cyclooctene, the turnover frequency of the catalyst can achieve as high as 949 h–1, an activity comparable to the highest of all reported early transition-metal based catalysts. UV–vis spectra and controlled catalytic experiments have been performed to ascertain the possible active site in the catalyst: compared with traditional WO3 and peroxide coordinated W-(η2-O2) species, the water coordinated H2O–WOx can transform to hydroperoxide HOO–WOx in the presence of H2O2, and the HOO–WOx species can be further activated by proton acid to enhance its catalytic activities.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
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IF 2.29
Weiping Luo,Mengqi Yan,Bao Tao,Sile Shi,Bo Chen
The solubilities of succinic acid, glutaric acid and adipic acid in propionic acid + water solvent mixtures at 304.25–354.65 K, and in propionic acid + ε-caprolactone + water solvent mixtures at 297.65–351.25 K were determined by the synthetic method at atmospheric pressure. The experimental data in propionic acid + water solvent mixtures were correlated by the modified Apelblat equation and modified nonrandom two-liquid (NRTL) activity coefficient model. The results showed that the calculated solubility data by the modified NRTL models had a better agreement with the experimental data, and the value of average relative deviation was 1.923%. And the solubilities of succinic acid, glutaric acid and adipic acid in ternary propionic acid + ε-caprolactone + water solvent mixtures predicted by the modified NRTL model agree with the experimentally determined results satisfactorily, which showed that the modified NRTL model would be suitable model for predicting the solubilities of succinic acid, glutaric acid and adipic acid in propionic acid + ε-caprolactone + water. Furthermore, the thermodynamic functions including dissolution enthalpy, entropy and Gibbs energy were obtained from the solubility data by using the van't Hoff equation.
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EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Jinze Wang,Lin Liu,Jie Chen,Mingxiao Deng,Xiagru Feng,Li Chen
In clinical cancer treatment, the combination therapy as new therapeutic strategy has attracted more concerns to feature stronger anticancer efficacy and fewer side effects. Herein, a kind of cationic nanoplatform was fabricated to co-deliver gene and photosensitizer based on the supramolecular interaction between β-cyclodextrin (β-CD) and tetraphenylporphyrin (TPP), in which cationic poly (L-lysine) as genes delivery was modified by β-cyclodextrin (β-CD-PLL) and PEGylated TPP was used as water soluble photosensitizer (TPP-PEG). The structures of β-CD-PLL and TPP-PEG were characterized by 1 H NMR. The host-guest recognition between β-CD-PLL and TPP-PEG was verified by DLS and TEM. In vitro data indicated that this platform showed high DNA transfection efficiency and photodynamic effect for the combination of genetic and photodynamic therapy.
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FOOD HYDROCOLLOIDS
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2019
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IF 5.839
Guangjing Chen,Xuhui Chen,Bing Yang,Qingqing Yu,Xunyu Wei,Yongbo Ding,Jianquan Kan
The in vitro digestibility, prebiotic activity, and physicochemical properties of polysaccharides obtained from bamboo shoots ( Chimonobambusa quadrangularis ) using different extraction processes were investigated in this study. Five polysaccharide fractions were prepared by hot water-, accelerated solvent-, ultrasound-, microwave-, and enzyme-based extraction processes. First, the chemical and monosaccharide compositions, molecular weights, zeta potentials , and particle sizes of the five fractions were assessed using colorimetry , high-performance liquid chromatography, high-performance gel permeation chromatography , and dynamic light scattering. Next, digestibility was tested using artificial gastric juice and α-amylase. Finally, the five polysaccharide fractions were added to liquid cultures of bifidobacteria and lactobacilli strains to serve as carbon sources alternative to glucose for in vitro fermentation to evaluate their ability to promote the growth of probiotic bacterial species and stimulate short chain fatty acids (SCFAs) production. It was found polysaccharides obtained by ultrasound- and enzyme-assisted extraction had significantly ( p < 0.05) higher total carbohydrate contents of 61.9% and 61.5%, lower medium-high MWs of 117.49 and 117.25 kDa, and smaller particle sizes of 116.8 and 190.73 nm, respectively. All of the polysaccharide fractions were resistant to hydrolysis by artificial gastric juice and α-amylase. Furthermore, the five polysaccharides significantly stimulated the growth of the tested probiotics and increased lactic, acetate, propionate , and butyrate acids production from fermentation for 48 h compared to the control ( p < 0.05). The polysaccharides prepared using ultrasound- and enzyme-assisted extraction processes displayed better prebiotic activity than the other fractions as they induced notably more proliferation of probiotic bacteria and higher production of SCFAs.
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POLYMER DEGRADATION AND STABILITY
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2019
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IF 3.78
Fusheng Liu,Jiao Guo,Penghui Zhao,Yongqiang Gu,Jun Gao,Mengshuai Liu
Several DBU-based protic ionic liquids were facilely synthesized, they were successfully used as solvents and catalysts for alcoholysis of poly(lactic acid) (PLA) to yield lactate esters . The structure of ionic liquids and reaction parameters were optimized. Using [HDBU][AA] as the catalytic medium, which was composed by a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) cation and an acetate anion, the PLA could be completely depolymerized with a 91% methyl lactate yield under the conditions of 100 °C, 5 mol% catalyst loading for 5 h. The effect of alcohol structures on the catalytic behaviors was studied, and good to excellent product yields were obtained. Moreover, the developed [HDBU][AA] showed excellent recyclability and structure stability. A possible reaction mechanism concerning the synergistic effect of the anion-cation ions was proposed. The DBU-based protic ionic liquids presented herein are low-cost and one-step synthesized, exhibiting great potential as green and efficient platform for direct and selective alcoholysis of PLA.
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PHARMACOLOGICAL RESEARCH
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2019
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IF 5.574
Runzhi Chen,Ying Xu,Peng Wu,Hao Zhou,Yi Lasanajak,Yingying Fang,Lan Tang,Ling Ye,Xing Li,Zheng Cai,Jie Zhao
The gut microbiota and its short chain fatty acid (SCFA) metabolites have been established to play an important protective role against neurodegenerative diseases. Our previous study demonstrated that cerebral ischemic stroke triggers dysfunctional gut microbiota and increased intestinal permeability. In this study, we aimed to clarify the mechanism by which gut microbiota and SCFAs can treat cerebral ischemic stroke in rat middle cerebral artery occlusion models and use the information to develop new therapies. Our results show that oral administration of non-absorbable antibiotics reduced neurological impairment and the cerebral infarct volume, relieved cerebral edemas, and decreased blood lipid levels by altering the gut microbiota. We also found that ischemic stroke decreased intestinal levels of SCFAs. And that transplanting fecal microbiota rich in these metabolites was an effective means of treating the condition. Compared with other SCFAs, butyric acid showed the highest negative correlation with ischemic stroke. Supplementation with butyric acid treated models of ischemic stroke effectively by remodeling the gut microbiota, enriching the beneficial Lactobacillus , and repairing the leaky gut. In conclusion, interfering with the gut microbiota by transplanting fecal bacteria rich in SCFAs and supplementing with butyric acid were found to be effective treatments for cerebral ischemic stroke.
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PubMed
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SOIL USE AND MANAGEMENT
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2019
·Vol. 35
·期 4
·664-674
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IF 1.958
Xuewei Wang,Yanju Gao,Baowei Hu,Guixin Chu
Polyphosphate is an alternative phosphorus (P) source which can substitute for orthophosphate-based P fertilizers in agriculture. In order to explore the effects of polyphosphate addition on soil P availability, and how pH and temperature affect polyphosphate hydrolysis, an aqueous and a soil incubation experiment were conducted at different pHs (5.0 and 8.2) and temperatures (15, 25 and 35°C); the influence of polyphosphate addition on soil available micronutrients (i.e., iron—Fe, manganese—Mn and zinc—Zn) was also studied. The experiments used three different polyphosphate fertilizers (solid and liquid ammonium polyphosphate and polyphosphoric acid) and two soil types (acid and alkaline). In aqueous incubation conditions, the average amount of phosphate ( ) released from polyphosphate fertilizers at 35°C was 2.7 times greater than at 25°C. The average Olsen P in polyphosphate-treated soil at 35°C was 1.12 times greater than at 25°C, indicating that higher temperature facilitates polyphosphate hydrolysis. Polyphosphate hydrolysis increased as the pH decreased in aqueous solution, but its hydrolysis rate was greater in calcareous soil than in acid soil. Moreover, polyphosphate significantly increased soil available Fe, Mn and Zn concentrations by an average of 14%, 16% and 20%, respectively, relative to orthophosphate fertilizer. In summary, high temperature and low pH favour the hydrolysis of short-chain polyphosphate (aqueous incubation experiment), and polyphosphate significantly increases soil P availability and mobilizes soil micronutrients. The application of polyphosphate can be recommended as a pragmatic P management strategy in agriculture: however, soil temperature and pH should be taken into account when using polyphosphate fertilizers.
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危险品化学品经营许可证（带存储）