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Zhu C.,Northwest University, China | Sun Y.,Northwest University, China | Wang Y.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Luo Y.,Northwest University, China | Fan D.,Northwest University, China
Materials Science and Engineering C | Year: 2013

In order to develop the nutritional trace elements which could be absorbed and utilized effectively, protein chelates were adopted. Calcium, copper and manganese were considered based on their physiological functions, and the new chelates of HLC-Ca, HLC-Cu and HLC-Mn were formed in MOPS or MES buffer and purified by gel chromatography, and then freeze-dried. And they were detected and analyzed by atomic absorption spectrophotometry, ultraviolet-visible absorption (UV-vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, fluorescence quenching method, circular dichroism (CD) and differential scanning calorimetry (DSC). The results showed that some chemical reactions happened between HLC and the three metal ions to form new chemical compounds. The thermodynamic parameters, δH, δG and δS, showed that the chelation process between HLC and metal ions was performed spontaneously. Fluorescence quenching spectra of HLC indicated that the quenching mechanism was static in nature. According to the data of DSC, the new chelates were more stable than the free HLC. And HLC-metal complex was non-toxic to the BHK21 cell through MTT assay. © 2013 Elsevier B.V. Source


Zhu C.,Northwest University, China | Fan D.,Northwest University, China | Wang Y.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry
Materials Science and Engineering C | Year: 2014

Following the previous work of media layer and adventitia layer construction for vascular scaffold, we developed a suitable intima layer scaffold for endothelialization using novel human-like collagen/hyaluronic acid composite at different mass ratios of 40/1, 20/1 and 10/1 (HLC to HA) by freeze-drying process. The structure, mechanical strength, degradation and biocompatibility of the vascular HLC/HA scaffold were evaluated. The results showed that the 10/1 HLC/HA composited an optimal scaffold with (1) an interconnected porous network with a pore diameter of 12 ± 2 μm and porosity of 89.3%, (2) better mechanical properties with higher stress of 321.7 ± 15 kPa and strain of 45.5 ± 0.2% than 40/1, 20/1 and pure HLC scaffolds, (3) only 9% degradation upon immersion in PBS for 45 days at 37 C in vitro, and (4) excellent biocompatibility. This study suggests that the 10/1 HLC/HA composite has a broad prospect of application as luminal vascular scaffold in the tissue engineering. © 2013 Published by Elsevier B.V. All rights reserved. Source


Wang Y.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Wang H.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Feng X.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Wang X.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Huang J.,Northwest University, China
International Journal of Hydrogen Energy | Year: 2010

An anaerobic fermentation process to produce hydrogen from cornstalk wastes was systematically investigated in this work. Batch experiments numbered series I, II and III were designed to investigate the effects of acid pretreatment, enzymatic hydrolysis (enzymatic temperature, enzymatic time and enzymatic pH) on hydrogen production by using the natural sludge as inoculant. A maximum cumulative H2 yield of 126.22 ml g-1-CS (Cornstalk, or 146.94 ml g-1-TS, Total Solid) and an average H2 production rate of 9.58 ml g-1-CS h-1 were obtained from fermentation cornstalk with a concentration of 20 g/L and an initial pH of 7.0 at 36 °C through an optimal pretreatment process. The optimal process was that the substrate was soaked with an HCl concentration of 0.6 wt% at 90 °C for 2 h, and subsequently enzymatic hydrolysis for 72 h at 50 °C and pH 4.8 before fermentation. The biogas consisted of only H2 and CO2. In addition, the fermentation system was the typical ethanol-type fermentation according to ethanol and acetate as the main liquid by-products. © 2009 Professor T. Nejat Veziroglu. Source


Ke X.-J.,China Three Gorges University | Li D.-S.,China Three Gorges University | Li D.-S.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Zhao J.,China Three Gorges University | And 5 more authors.
Inorganic Chemistry Communications | Year: 2010

A new CdII-coordination polymer, namely, [Cd3(nbtc)2·4H2O]n (1), has been hydrothermally synthesized with in situ generated 5-nitrobenzene-1,2,3-tricarboxylate (nbtc3-) ligand. Single-crystal X-ray diffraction study reveals that compound 1 is constructed from trinuclear CdII clusters and exhibits a previously unknown 2D (3,4,9)-connected (3.42)(32.43.5)(36.411.510.68.8) topology as well as 3D H-bonding pillared architecture. In addition, the photoluminescent property and thermal stability of 1 were also discussed. © 2010 Elsevier B.V. All rights reserved. Source


Zhao J.,China Three Gorges University | Li D.-S.,China Three Gorges University | Li D.-S.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | Wu Y.-P.,Key Laboratory of Synthetic and Natural Functional Molecule Chemistry | And 5 more authors.
Inorganica Chimica Acta | Year: 2010

The tartaric acid (H4L), serving as versatile tectons, link CuII atoms with three different bridging modes to form a unique double-bowed nanosized Cu10-assembly, namely, [CuII 10(H2L)4(HL)4]·(apy)8·13H2O (1) (apy = 2-aminopyridine). Single-crystal analysis reveals that the nano-cluster is composed of two bow-shaped pentameric subunits joined together by carboxyl O bridges, in which eight CuII atoms are in distorted octahedral site, while the other two CuII atoms display the square-pyramidal geometries. Interestingly, such decanuclear SUBs are connected by R2 2 (12) H-bonding rings into a 3D α-Po network. Magnetic studies show an antiferromagnetic interaction between CuII centers. © 2009 Elsevier B.V. All rights reserved. Source

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