CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Lihua Zhou,Yang He,Shaohua Gou,Qin Zhang,Ling Liu,Lan Tang,Xianzhi Zhou,Ming Duan
Currently, it remains a great challenge to maintain clay stability in water and prevent shear dispersion of the clay lamellae. Herein, a series of piperazine-based polyether Gemini quaternary ammonium salts (QAs) with different alkyl chains and linker groups were synthesized as the novel intercalator candidates. We established the correlations between their structures and inhibition swelling behavior of montmorillonite (MMT), a representatively hydratable and expansive clay. Upon loading saturated QAs, the lateral bilayer intercalation aligning parallelly to lamella surface was validated by X-ray diffraction (XRD), namely a monolayer adsorption on MMT platelets, agreeing well with Langmuir isotherm model. By combining Fourier transform infrared (FT-IR) spectroscopy and zeta potential, electrostatic attraction and hydrogen bonding were confirmed as the crucial multiple driving forces of adsorption and intercalation. The increased water contact angles (WCAs) demonstrated the formation of protective coating for hindering the entrance of water into the interlayers of MMT. XRD and field emission scanning electron microscope (FE-SEM) indicated that, when the carbon number of “tail” groups in QAs molecules was greater than 12, the platelets of organo-MMT (OMMT) were prone to be exfoliated and aggregated parallelly to sheet surface. This study provides a unique foundation for designing the molecular structure of clay modifier.
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ENVIRONMENTAL POLLUTION
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2019
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IF 5.714
Mei Huang,Yan Wang,Jinquan Wan,Yongwen Ma,Haiyuan Chi,Yanyan Xu,Shuying Qiu
Achieving large pore size, high catalytic performance with stable structure is critical for metal–organic frameworks (MOFs) to have more hopeful prospects in catalytic applications. Herein, we had reported a method to synthesize highly reactive yet stable defective iron-based Metal organic frameworks by using different monocarboxylic acids with varying lengths as a modulator. The physical−chemical characterization illustrating that modulators could improve the crystallinity , enlarge pore size and enhance catalytic performance and octanoic acid (OA) was screened to be the suitable choice. The catalytic performance of catalysts was detected through persulfate (PS) activation for degrading Tetrabromobisphenol A (TBBPA). The study demonstrated that the highest degradation efficiency for 0.018 mmol L −1 TBBPA was that 97.79% in the conditions of the 1.0 g L −1 Fe(BDC)(DMF,F)-OA-30 dosage and TBBPA:PS = 200:1. In addition, there was observed that no obvious change of the crystal structure, little the leachable iron concentration in the solutions and no significant loss of catalytic activities of Fe(BDC)(DMF,F)-OA-30 after 5th cycles. The iron valence state of Fe(BDC)(DMF,F)-OA-30 before and after degradation and electrochemical properties reveal that the partial substitution of organic ligands by octanoic acid, when removing OA and forming defects by heat and vacuum treatment to generate coordinatively unsaturated metal sites and accelerate the original transmission of electronic, leading to enhance the activity of persulfate activation for efficient removal TBBPA.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Mingjia Wang,Guijie Chen,Dan Chen,Hong Ye,Yi Sun,Xiaoxiong Zeng,Zhonghua Liu
One purified fraction from crude Fuzhuan brick tea polysaccharides (FBTPS), FBTPS-3, was obtained through column chromatography of DEAE Sepharose Fast Flow. The chemical properties and probiotic effects of FBTPS-3 were evaluated by fermentation in vitro . Moreover, the effects of FBTPS-3 on the function and metabolic pathway of gut microbiota were investigated by metagenomic sequencing. The results showed that FBTPS-3 was an heteropolysaccharide with molecular weight of 741 kDa, which was mainly composed of Man, Rha, GalA, Gal and Ara in molar ratio of 8.7:15.5:42.2:19.7:13.9. The contents of carbohydrates and uronic acid in FBTPS-3 were 44.78 ± 2.85% and 40.4 ± 2.11%, respectively. After fermentation, the molecular weight of FBTPS-3 and content of carbohydrates were significantly decreased, indicating that FBTPS-3 could be utilized by gut microbiota. Furthermore, the relative abundances of Bacteroides , Megasphaera and Prevotella were significantly increased by FBTPS-3. FBTPS-3 also significantly promoted the production of acetic, propionic and n-butyric acids. Based on the metagenomic sequencing, it was found that FBTPS-3 significantly enriched the metabolic pathway of starch and sucrose. All the results suggest that FBTPS-3 is expected to be developed as functional ingredients or foods to improve the host health through regulating the gut microbiota and physiological metabolic functions.
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CELLULOSE
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2018
·Vol. 25
·期 5
·3091-3103
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IF 3.809
Zhang Yanjuan,Wei Liping,Hu Huayu,Zhao Zengyan,Huang Zuqiang,Huang Aimin,Shen Fang,Liang Jing,Qin Yuben
Abstract Three cellulose esters, cellulose acetate-butyrate, cellulose acetate-octanoate, and cellulose acetate-laurate, were synthesized by both conventional co-reactant reaction (CCR) and mechanical activation-assisted co-reactant reaction (MACR) methods, and the corresponding nano-cellulose esters were prepared by high pressure homogenization to comparatively investigate their tribological properties as lubricant additives in liquid paraffin base oil. MACR method was more effective than CCR method for preparing long chain cellulose esters, and the MACR-prepared cellulose esters were more easily homogenized to smaller nanoparticles. Tribological testing indicated that anti-wear and load-carrying properties of the lubricants were significantly enhanced with nano-cellulose esters as additives compared to those of pure liquid paraffin, especially the MACR-prepared long chain cellulose esters. The wear scar diameter on worn surface of the steel balls reduced with the increase in degree of substitution (DS) and chain length of long chain substituents and the decrease in size dimension of nano-cellulose esters. The polar ester carbonyl groups, unesterified hydroxyl groups, and long hydrocarbon alkyl chains in nano-cellulose esters could lead to the formation of a film layer in the steel/steel contact surfaces for protecting the metals from friction and wear, which gave the lubricants with good anti-wear and load-carrying properties. The nano-cellulose esters with high DS and long chain substituents prepared by MACR technology as ecofriendly additives exhibited better lubricating ability. Graphical abstract Nano-cellulose esters with high DS of long chain substituents prepared by mechanical activation-assisted co-reactant reaction technology used as ecofriendly lubricant additives in base oil showed good anti-wear and load-carrying properties, ascribing to the formation of a film layer in the steel/steel contact surfaces for protecting the metals from friction and wear.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
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IF 3.909
Song-Tao Fan,Shao-Ping Nie,Xiao-Jun Huang,Sunan Wang,Jie-Lun Hu,Jun-Hua Xie,Qi-Xing Nie,Ming-Yong Xie
In vivo an ecological network of polysaccharides utilization by gut microbiota is not only an intense competition but also an impressive cooperation pattern. The present study evaluated the in vivo protective effect of combined fungal polysaccharides (CFP) from Cordyceps sinensis and Ganoderma atrum on colon immune dysfunction, induced by 150 mg/kg cyclophosphamide (CP). The results showed that C. sinensis polysaccharides (CSP) significantly promoted microbial-derived butyrate to improve histone h3 acetylation mediating regulatory T (Treg) cell specific Foxp3, as well as significantly restored CP-induced elevation of interleukin (IL)-17 and IL-21. Additionally, G. atrum polysaccharides (PSG) significantly down-regulated MyD88, as well as significantly increased IL-10 and TGF-β3. Furthermore, CFP balanced the disequilibrium of cytokines secretion and Foxp3/RORγt ratio related Treg/T helper 17 (Th17) balance, as well as down-regulated the TLR-mediated inflammatory signaling pathway and promoted secretory immunoglobulin A (sIgA) secretion to suppress colonic inflammation. Therefore, our results typically contribute to understand the in vivo immunoregulatory function of fungal polysaccharides compounds, involving microbial-associated inflammatory signals and specific metabolic products.
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FOOD CHEMISTRY
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2018
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IF 4.946
Hongliang Zeng,Yixin Zheng,Yan Lin,Cancan Huang,Shan Lin,Baodong Zheng,Yi Zhang
The aim of this study was to investigate the proliferation effect of fractionated lotus seed resistant starch (LRS3-20%, LRS3-30%) and the structural changes following fermentation. Fractionated lotus seed resistant starch, especially LRS3-20%, promoted the proliferation of these probiotics, and Bifidobacterium longum produced large quantities of acetic acid, while Lactobacillus delbrueckii subsp. bulgaricus produced lactic acid. Additionally, the probiotics with lotus seed resistant starch (LRS3) and LRS3-20% survived more successfully in simulated gastrointestinal solutions compared to glucose, LRS3-30% and high amylose maize starch, but LRS3 and LRS3-20% differed in their abilities to enhance the tolerance to acidic buffer, bile acid and simulated gastric juice. Furthermore, after fermentation, fractionated lotus seed resistant starch displayed a loose, rough surface. The crystalline and double helical structure increased as the amount of amorphous and sub-crystalline structure reduced following fermentation. Interestingly, structural changes were correlated with the original structures and utilisation by the probiotics.
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Journal of Functional Foods
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2018
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IF 3.47
Du-Xin Jin,Jun-Fang He,Xue-Gang Luo,Tong-Cun Zhang
Hypericum attenuatum Choisy, as an edible medicinal plant, possesses multiple therapeutic effects. Type 2 diabetes is a metabolic disorder that has become a major threat to public health. The objective of this study was to investigate the hypoglycemic effect of Hypericum attenuatum Choisy extracts (HaC) on T2DM mice and modulatory effect of HaC on composition of intestinal microflora. T2DM mice were treated with HaC for 5 weeks. HaC could modulate fasting blood glucose, improve hepatic insulin sensitivity and promote hepatic glycogen storage by activating IRS1/PI3K/AKT pathway. Moreover, HaC regulated dysfunctional lipid metabolism and reduced inflammation in T2DM mice. Additionally, HaC treatment could modulate the compositions of gut microbiota in small intestine and colon with the altered abundances of Firmicutes , Bacteroidetes and Proteobacteria . Meanwhile, HaC treatment could augment short chain fatty acids contents. These results demonstrate that H. attenuatum Choisy may be a potential therapy for the treatment of T2DM.
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ENERGY & FUELS
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2018
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IF 3.024
Zhongqi Ren,Lu Wei,Zhiyong Zhou,Fan Zhang,Wei Liu
Deep desulfurization of fuels has attracted worldwide attention as a result of environmental concerns. In this study, a new series of protic ionic liquids (PILs) with different acidic anions were synthesized and the extraction desulfurization of dibenzothiophene (DBT), benzothiophene (BT), and 4,6-dimethyldibenzothiophene (DMDBT) in model oil was carried out. The result showed that the extraction efficiency of DBT decreased in the order of [1,8-diazabicyclo[5.4.0]undec-7-ene] ([DBU]) > [N-formylmorpholine] ([NFM]) > [N-methylimidazole] ([HMIM]) > [N-methylmorpholine] ([NMM]) while the PIL anion was formate and DBU-based PILs with different anions could remove more than 80% DBT and BT in 1 cycle. The extraction efficiencies of [DBU]Pr were 98.33% for DBT (from 500 to 8.35 ppm) and 98.67% for BT (from 500 to 6.65 ppm) after 3 extraction cycles. The value for DMDBT was 99.38% (from 500 to 3.10 ppm) after 5 cycles. The interaction energies of these PILs with three aromatic sulfur compounds were also studied through quantum chemistry calculation. Finally, the regeneration of the used PIL was performed by the back-extraction method and checked by 1H nuclear magnetic resonance.
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JOURNAL OF LUMINESCENCE
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2018
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IF 2.732
Mingyue Ma,Haidong Li,Hongwen Zhang,Daocheng Pan
Eu 3+ -doped CdMoO 4 luminescent ultra-thin films were fabricated by a facile aqueous solution method. The thin films were characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), and the results showed that Eu 3+ ions are doped into CdMoO 4 and the luminescent thin films are dense and smooth. Photoluminescence (PL) spectra, UV–vis absorption spectra and lifetimes were also used to characterize luminescent properties of the resulting films. The optimal doping concentration was found to be 10 mol% for the Eu 3+ -doped CdMoO 4 luminescent ultra-thin films.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Hao Ling,Sen Liu,Hongxia Gao,Zhiwu Liang
In order to study the effect of heat-stable salts (HSSs) on the CO 2 absorption performance of amine solution, the CO 2 absorption/desorption rates and cyclic CO 2 capacity of 30 wt% (monoethanolamine) MEA solutions in the presence of various acidic degradation products were comprehensively investigated systematically by an improved rate-based screening method. In addition, the initial pH values and CO 2 equilibrium solubility were also evaluated. These acidic degradation products considered were formic acid , acetic acid, propionic acid , butyric acid , glycolic acid, oxalic acid , lactic acid, malonic acid and bicine. The experimental results indicated that the carboxylic acids with different chemical structures can reduce the initial pH values, equilibrium solubility of CO 2 , absorption rate and cyclic CO 2 solubility, but promote the CO 2 desorption rate of aqueous MEA solution. Furthermore, a countermeasure was proposed to maintain absorption performance and reduce the energy requirement of solvent regeneration for an MEA amine-treating unit. The obtained results can provide a guidance for developing corresponding countermeasure for heat-stable salts control and removal in the CO 2 absorption-stripping process using amine solutions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Yuqi Huang,Tian Ke,Yuqi Ke,Qilong Ren,Qiwei Yang,Huabin Xing
The separation of 1,3-butadiene (1,3-C4H6) and n-butene (n-C4H8) using ionic liquids (ILs) has received great attention in recent years, but designing an industrially attractive IL that combines large solubility and high selectivity remains challenging. In this work, we prepared several tributylethylphosphonium-based carboxylate ILs featuring large free volume and strong hydrogen bonding basicities through finely tuning the structures of cations and anions for the separation of C4 hydrocarbons. These carboxylate ILs exhibited the highest mass solubility for 1,3-C4H6 yet reported (0.899 and 0.663 mmol/g in [P4442][C17H35COO] and [P4442][HCOO], respectively) and excellent 1,3-C4H6/n-C4H8 selectivity (1.83 in [P4442][HCOO]) at 308.1 K and 100 kPa, which sets a new benchmark for 1,3-C4H6/n-C4H8 separation. Qualitative relationships between the free volume/basicity and their solubility were established. Results revealed that the free volume of unit mass and basicity were positively correlated with the 1,3-C4H6 solubility. The interaction between the ILs and gases was explored by quantum chemical calculations.
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FOOD RESEARCH INTERNATIONAL
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2019
·
IF 3.579
Ruiqiu Zhao,Ninghui Cheng,Paul A. Nakata,Liyan Zhao,Qiuhui Hu
The objective was to determine the contribution of A. auricular polysaccharides (AAP) in modulating the composition and diversity of the intestinal microbe in mice. AAP was extracted from A. auricula freeze-dried powder and different amounts of AAP (40, 80, 160 mg AAP/kg body weight) were administered to 6 week-old male ICR mice by gavage feeding over a five-week period. AAP feeding changed the intestinal environment in the mice. The pH value of the intestinal compartments decreased while SCFAs concentrations increased in AAP-fed groups, in a dose dependent manner, compared to the controls ( P < .05). High throughput sequencing revealed an enrichment in the diversity and an alteration in the composition of the fecal microbiota in the AAP fed mice with a significant decrease in the Firmicutes/Bacteroidetes ratio ( P < .05). The relative abundances of Porphyromonadaceae and Bacteroidaceae also increased in the AAP fed mice which positively correlated with an increase in serum IgA and IgG concentrations ( P < .05). The findings from this study show that AAP modulates the mouse gut microbiota and may contribute, at least in part, to some of the reported beneficial effects from the consumption of the mushroom, A. auricula .
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