Advanced Materials Research Vols. 560-561

Abstract: In this investigation, the N, O-carboxymethyl chitosan (NOCC) was synthesized. A novel pH-sensitive hydrogel system composed of a water-soluble chitosan derivative (N,O-carboxymethyl chitosan, NOCC)and Human-like collagen (HLC) blended with phosphate was developed for controlling drug delivery and NOCC–HLC microspheres were prepared by the technology of electrostatic droplet generation technique. The release profiles of a model protein drug (bovine serum albumin, BSA) from test hydrogels were studied in simulated gastric and intestinal media.

Abstract: This study was designed to comparative evaluate the chemical composition of the essential oil from leaf, aerial root, twig, root and bark parts of Ficus microcarpa L.f. (Moraceace). Gas chromatography (GC) and gas chromatography/mass spectrometry (GC–MS) analyses of the oils revealed the presence of 6, 6, 5, 5 and 5 compounds in the essential oils obtained by hydrodistillation from different parts, respectively. The total yield of the volatile fractions was subsequently 1.89%, 0.87%, 1.27%, 0.97% and 0.71%. Higher amounts of aliphatic acids were found to compose a major chemotype in diverse parts of the plant. n-Hexadecanoic acid, elaidic acid and linoleic acid were the main and common component of all the essential oils totally attaining in average 74%, 87%, 56%, 46% and 88%, independently. In addition, some pharmaceutical components such as elaidic acid, linoleic acid and squalene were discovered. The study offers theoretic basis for utilization of the traditional folk herb F. microcarpa.

Abstract: This study was designed to comparative evaluate total flavonoid contents (TFC) in leaf, aerial root, twig, root and bark parts of Ficus microcarpa L.f. (Moraceace). Ultrasonic-assisted extraction was adopted using benign solvent: ethanol and water to determine the extraction efficiency under the condition of ethanol concentration 40%, solid/liquid ratio of 1:25, extraction time 35 min and extraction temperature at 60 °C. According to the experimental results, the TFC values varied considerably and the extraction yield of 2.67±0.02%, 3.70±0.043%, 2.99±0.04%, 6.56±0.83% and 4.26±0.18% were obtained from different parts, respectively. The root part was characterized as containing a high amount of flavonoids, which might be the active compounds responsible for the pharmaceutical properties of the plant. The study offers theoretic basis for further utilization of the traditional folk herb F. microcarpa.

Abstract: The effects of ethanol concentration, reaction time, solid-liquid ratio and temperature on auto-catalytic ethanol pulping reaction of corncob acid hydrolyzed residua were investigated. The relationships of those four factors and pulping selectivity(Y/K ratio) were also discussed. The optimal pulping conditions were determined, which were ethanol concentration 55%, reaction time 2.0h, solid-liquid ratio 1:10, temperature 175°C. The temperature has the most influential effect. Structures of corncob acid hydrolyzed residua and dry pulp were observed by electronic microscope. The process of pulping reaction and the delignification were also verified.

Abstract: The objective of this paper was to prepare the composite of crefradine/montmorillionite in the method of solution intercalation. The drug load and intercalation rate varied with the drug concentration. X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) Spectroscopy, and thermal analysis (TG-DSC) were applied to characterize composite mentioned above. Together with drug release tests, results indicate cefradine intercalated into montmorillionite.The release profiles of cefradine/MMT in simulated gastric fluid (pH 1.2) and simulated intestinal fluid (pH 7.4) at 37°Cduring 10h are shown in Fig. 4. The amount of cefradine in the beginning 2h came up to 35% and 50%, and in the following time, cefradine released slowly. The release behaviors met the requirements of sustained release.

Abstract: Utilization of biomass in iron ores sintering process as heating agent and reducing agent contributes to energy conservation and emission reduction, and can partially replace for coal and coke. Different biomass powders (pine sawdust, corn straw, and rice shell) were mixed together with goethite ores for roasting process to investigate the mechanism of reduction roasting. The thermal behavior, phase structure and magnetic properties have been thoroughly discussed. The results in this work provide a fundamental understanding for the direct reduction of iron ores separation.

Abstract: The paper recovered the lead and zinc from a refractory oxide lead-zinc ore. The grade of lead is 3.97%, with the oxidation rate of 50%.The grade of zinc is 3.37%, with the oxidation rate of 10%.The test made the lead-zinc sulphide flotation first, depressing the zinc mineral and floating the lead mineral, then selected the oxide of lead by sulfidation. The experiment got the best pharmacy system by comparing the species and amount of agent. As a result, the lead sulphide concentrate with a grade of 45.32% and the recovery of 44.86%, the zinc concentrate with a grade of 50.19% and the recovery of 81.23%, the lead oxide concentrate with a grade of 50.37% and the recovery of 45.64% were obtained. Three products had received good indicators, and the issue of lead and zinc interacted with each other had been resolved.

Abstract: Two efficient optical methods are demonstrated to improve the formation of surface relief grating (SRG). The SRG formation is realized by a two-beam interference technique (λ=532nm) in an azobenzene side-chain copolymer. An incoherent UV beam (λ=355nm) or an incoherent VIS beam (λ=532nm), called assisting beam, was used to accelerate the photoisomerization process of the cis-form↔trans-form cycle, resulting in an efficient formation of SRG. The dependence of the diffraction efficiency and the relief depth of the SRGs on the polarizations of both assisting beams were investigated showing two different assisting mechanisms.

Abstract: An effective and optimized method for synthesis silica sol nanospheres by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in the presence of aqueous alcohol solution with ammonia as catalyst was described. Under this experiment condition, monodisperse and uniform-size silica sol spheres with average diameters from 38-95nm were obtained. Here, we successfully controlled the size and shape of silica sol by fine adjusting the reaction parameters such as concentration of TEOS, value of R (H2O/TEOS) and ammonia concentration. On the basis of the experiment results, it was found that sphere size declined as the concentration of TEOS decreased. Also with the increment of ammonia concentration, the diameter of silica sol decreased slightly. However, higher R (H2O/TEOS) value would lead to larger sphere size in the range of 62-95nm. The resulting silica sol was determined by Field Emission Scanning Electron Microscopy (FE-SEM) and Fourier transformed infrared (FT-IR).

Abstract: The products which work in the field, aviation, marine and other harsh environmental conditions are easily to failure caused by humidity, slat fog and fungus, so the three anti-protection technology is particularly important. In this paper, we will analyze and talk about some key issues in the three anti-(humidity, slat fog and fungus) environmental test, such as the fungus testing cycle, the selection of fungus, the testing methods of the salt fog and humid , the evaluation of test results and so on. Give recommendations for improvement at last.