Advanced Materials Research Vols. 396-398

Abstract: The super-high molecular weight polyacrylamide flocculants were synthesized using potassium persulfate/sodium hydrogen sulfite as initiators via free radical solution polymerization. The effects of monomer concentration and initiator dosage on the molecular weight, insoluble fraction and dissolution rate of PAM were investigated. The flocculation properties of PAMs prepared was examined by flocculating kaolin suspensions. The results show that the PAM products synthesized at the monomer concentration 30% and the initiator dosage 0.5‰ can meet the requirements. The molecular weight of this kind of PAM can reach 5.84×106, insoluble fraction can decrease to 0, and the dissolution can be completed in 10 minutes. Using this kind of PAM as flocculants (1.45mg PAM/100g kaolin suspension), the clear water transmittance can be up to 99% at pH 3.5~4.0.

Abstract: This study focused on the distribution and pasting properties of starches in sweet potato (Ipomoea batatas L.) tuber. A fresh sweet potato tuber was cut into six equivalent parts. The extractable contents and pasting properties of starches from different parts of fresh sweet potato tuber were determined. The results showed that the extractable content of starches from the Middle section of sweet potato tuber is lower than that from the head and the end section of sweet potato tuber. The extractable content of starches from the inner-end part and the outer-Middle part of sweet potato tuber are 16.2% and 10.3% respectively. The amylose content of starches is relatively higher in the Middle section and outer layer of sweet potato tuber. The amylose content of starches from the outer-Middle part and the inner-end part of sweet potato tuber are 29.5% and 26.7% respectively. Pasting properties of starches from different parts of sweet potato tubers are different from each other. Among them, the starches from inner-end part of sweet potato tuber have the highest viscosities and a lower breakdown.

Abstract: Metabolomics is another important branch of systems biology after genomics, transcriptomics and proteomics and a new kind of holistic analysis technology. As part of Metabolomics is another important branch of systems biology after genomics, transcriptomics and proteomics and a new kind of holistic analysis technology. As part of system biology, the core of metabolomics is qualitative and quantitative analysis of all small molecule metabolites in a cell or biological system at specific time and conditions. The field of metabolomics study covers the diagnosis, nutrition, microbiology, environmental science, mechanism of drug action, toxicology and other aspects of botany. The metabolomics study of the traditional Chinese medicine (TCM) mainly focus on the safety evaluation of drugs, efficacy mechanism of traditional Chinese medicine, the variety and the quality control of Chinese medicine resources and so on. This paper provides an overview of metabolomics study of TCM.

Abstract: The effect of ι-carrageenan (ι-C) and soybean soluble polysaccharide (SSPS), on quality characteristics of tofu was evaluated. The addition of 0.05-0.2% (w/v) polysaccharide increased the yield of tofu. However, higher polysaccharide concentration could not sustain the observed increase. At temperature rise ramp, dG'/dt of tofu with SSPS was increased slightly than the samples with ι-C, due to difference in charge density and thermodynamic incompatibility between polysaccharide and soybean globulin. The addition of SSPS exhibited more increase in hardness and springiness of tofu as compared to ι-C. Microstructure of tofu with SSPS was more homogeneous. The addition of properly selected polysaccharide could improve the properties of tofu, which may be beneficial for food process

Abstract: he controlled-release tablets of sasanquasaponin (SQS) were prepared by using SQS, hydroxypropyl methyl cellulose, ethylcellulose and lactose as the main drug, skeleton material and fillers, respectively. The effects of the dosage of hydroxypropyl methyl cellulose and ethylcellulose on release rate were studied. The release rate curve of the data of the prescription of the controlled-release tablets of SQS were fitted as zero order, one order and Higuchi equation. The release rate of the controlled-release tablets of SQS were controlled by controlling the dosage of hydroxypropyl methyl cellulose and ethylcellulose. The influence of the dosage of hydroxypropyl methyl cellulose on release rate of the controlled-release tablets of SQS was the biggest factor. The prescription of the controlled-release tablets of SQS contains in each piece: SQS 200mg, hydroxypropyl methyl cellulose 40mg, ethylcellulose 30mg, lactose 30mg. The controlled-release tablets of SQS release SQS by slowness and constant in 12h.

Abstract: The isothermal crystallization kinetics of PP with different contents of AB2 hyperbranched polyester(HBP) added has been investigated. The results show that HBP acts as a nucleating agent for PP, and the hyperbranched polyester can decrease the half crystallization time (t1/2) and increase the crystallization rate of PP greatly. The Avrami exponents of PP and nucleated PP are all close to 2.5. Hoffman theory was adopted to calculate the interfacial free energy per unit area perpendicular to PP chains σe of PP and PP/HBP blends.

Abstract: In this paper, content of heavy metals such as mercury, lead, cadmium and arsenic in tobacco leaves, tobacco stems, imported and domestic RT was compared, it was found that content of heavy metals in tobacco leaves was higher than that in RT and tobacco stems; compared with the imported RT, the content of heavy metals in domestic products was higher, especially the content of cadmium was significantly high. The soil was the main source of heavy metals in RT, so strengthening inspection and monitor of soil was necessary and important.

Abstract: A series of supported catalysts Co3O4/SiO2 were prepared by deposition precipitation method. ICP-AES, XRD and TEM data revealed that the Co3O4 active site was highly dispersed on the surface of SiO2. The catalysts were evaluated for selective epoxidation of styrene with molecular oxygen. The results showed that the catalysts were of good catalytic activity for styrene epoxidation and many factors had an evident effect on the catalytic epoxidation activity. The best catalyst was 3% Co3O4/SiO2 on which 96.3% conversion of styrene and 52.7% selectivity of styrene oxide were obtained under the flow rate of O2 20mL/min, 100°C, 10h with solvent.

Abstract: A triaxial LiFePO4 nanorod with Graphite was successfully synthesized through the electrospinning method.In order to improve lithium-ion battery cathode material lithium ion phosphate properties, to enhance its electronic conductivity and lithium ion diffusion rate and lower electrode polarization, the present invention was prepared by using electrospinning lithium-ion battery cathode material lithium iron phosphate / graphite nanorods. The following is the process: first of all, precursor solution is prepared by electrospinning, the use of high voltage power supply, LiFePO4/graphite nanorods, and then the use of LiFePO4 / graphite nano-fiber sintering, and use change to reduce the carbon content of the sintering process, with varying carbon content of LiFePO4/graphite nano-rod nanorods.

Abstract: So far the absorption of NO by Fe^IIEDTA solution has not been put into commercial application due to its high cost. In this paper recycling EDTA via formation of EDTA iron (III) sodium salt was presented for the purpose of offering a new pathway to solve this issue. The invalid solution was fully oxidized after NO absorption by Fe^IIEDTA solution. Ion chromatogram were used to detect the remained ions in solution. It was found that the original ions such as SO₃^2-, NO₂^- and so on were all oxidized to SO₄^2- and NO₃^-. Solubility measurement was carried out and it was revealed that the separation and purification could be performed by decreasing the temperature to 306 K. Fourier transformation infrared spectrophotometer (FTIR) and X-ray diffractometer (XRD) were applied to determine the transformation product of EDTA. The results indicated that FeNaEDTA was formed. Inductively coupled plasma and atomic absorption spectroscopy (ICP-AAS) demonstrated that the practical solubility of FeNaEDTA reached 78.7% at pH 7.