Advanced Materials Research Vols. 396-398

Abstract: AIM: To study the chemical constituents of Euphorbia helioscopia. METHODS: Compounds 1-10 were isolated and purified by silica gel, Sephadex LH-20 and Rp-18 chromatogarphy. Their structures were elucidated mainly by spectroscopic methods. RESULTS: Ten known compounds, helioscopinolide A(1), helioscopinolide B(2), scopoletin(3), scoparone(4), isoscopoletin(5), licochalone A(6), quercelin(7), 7, 4’-dihydroxy-5-methoxy flacanone(8), 2’, 4’-dihydroxy-6’-methoxydihydrochalcone(9) and pinocembrin(10), were isolated and structurally elucidated. CONCLUSION: Compound 3-5 and 8-10 were isolated from this plant for the first time. 2D NMR spectrum data of 2 were also reported in this paper.

Abstract: The high antioxidant activity product was isolated from Pinctada fucata muscle by a method of Alcalase hydrolysis. Optimization using response surface methodology was performed and 3D response surfaces were plotted from the mathematical model. The results indicated that the optimal extraction conditions were as follows: pH 7.0, temperature 61°C, E/S 3.01%, hydrolysis time 3h, under the conditions of hydrolysis products of the DPPH radical scavenging rate of 67.3% and the degree of hydrolysis of 31.2%, which was in good agreement with the predicted model value.

Abstract: This study was designed to determine the polyphenolic contents of Eucommia ulmoicles Oliv leaf extracts and evaluate their antioxidant activities in vitro. All the extracts were evaluated for their radical scavenging activity by the DPPH method and their oxidative-retarding efficiency in vegetable oils. It was observed that the highest values were found in 70% MeOH extracts for total phenolic content as gallic acid. A good correlation between antioxidant activity and total phenol content in the extracts was found. The extraction yield, total phenol content and radical scavenging activity were increased and peroxide formation in vegetable oils were decreased with the graded solvent concentration of MeOH. The phenolic compound yield ranged from 2.45 to 11.35% and the total phenol content increased from 34.51 mg/g to 47.68 mg/g. DPPH scavenging activity increased from 56.32% to 90.37% as MeOH concentration increased. Compared to the control (70.45 meq/kg), 70% MeOH fraction with 47.68 mg/g phenolic compounds shows much stronger antioxidant ability (30.12 meq/kg) in vegetable oil system.

Abstract: Food traceability is a support tool for preventing and improving food safety problems. The purpose of food traceability is to collect the flow and transformation information of food-related materials in the food chains. When faced with a food safety crisis, we can find the source of the problem and track the flow of products from the information, and effectively carry out food recalls. In this paper, the status of food traceability in China is deeply analyzed from the laws, regulations, standards, traceability techniques and systems construction, and validity of internal and external traceability in food chains is assessed retrospectively. Then some recommendations for the further development of China's food traceability are proposed.

Abstract: A mesoporous molecular SBA-15 was synthesized using Pluronics P123 (PEO₂₀PPO₇₀PEO₂₀) as a structure-directing agent and TEOS as the silica source under acidic condition, and the structure of SBA-15 was determined by X-ray powder diffractometer and N₂ adsorption desorption. As it has been reported that siliceous SBA-15 adsorbents can have a very high affinity and capacity for proteins, the recombinant human basic fibroblast growth factor (rhbFGF) which is a kind of unstable protein was adsorpted by SBA-15, then the properties of SBA-15/bFGF complex were studied. The results had shown that the adsorption rate of rhbFGF by SBA - 15 reached 69.31% in pH 7.4 phosphate buffer at 4 °C. After 14 days, the released rate of rhbFGF from SBA-15 was 41.40% and 43.51% respectively in pH 10 phosphate buffer at 4 °C and 25 °C. Furthermore, the proliferation activity on NIH3T3 cells of the released rhbFGF still can be detected by MTT assay. Therefore, SBA-15 is possible to be used as a kind of material for bFGF adsorption and releasion.

Abstract: Preservative was very necessary used in coated paper coating. Preservative was typical paper additive which was low dosage and high yield. Preservative classification, function mechanism and application technology of coated paper coating was introduced and summarized by the numbers in this paper. Finally the development direction and prospect of preservative used in coated paper coating was prospected.

Abstract: A cationic polymeric flocculant was synthesized through solution polymerization. The polymerization was initiated by acrylamide and Aacryloxyethyltrimethyl Ammonium Chloride(DAC) monomers, and ammonium persulfate and sodium sulfite as redox initiation system. The copolymer obtained was characterized by Fourier-transform infrared (FTIR) spectroscopy. Its flocculating properties were evaluated by turbidity removal with clay suspensions, turbidity and COD removal with sewage using standard jar tests. The results demonstrate that the copolymer can be used as a kind of cationic polymeric flocculant in water and wastewater treatment.

Abstract: In this paper, the effects of xylanase modification on pulp and paper properties of masson pine mechanical pulp were investigated. After the modification, the Zeta potential of pulp and the cationic demand of whitewater increased，the drainage property of the pulp increased obviously. At the same time, the amount of shives decreased, it showed that using bio-enzyme could improve the utilization rate of raw materials as well as reduces the energy consumption of the mechanical pulp. On the other hand, xylanase modification had great effect on the dynamic contact angle, with the dosage of xylanase increased, the contact angle of the pulp first increased and then reduced.

Abstract: The conditions for purification of soyasaponin by macroporous resin adsorption strategies were analyzed. The results showed that macroporous resin D3520 was a suitable resin for the purification of soyasaponin. Static adsorption assay showed that 20:1 (w/w) D3520/soyasaponin at 40 oC for 2h adsorption were optimal for soyasaponin purification. In the column chromatography, 0.5BV (bed volume)/h flow rate would be suitable to reach higher purity of near 90 % soyasaponin.

Abstract: The aim of this work was to study the effect of adding silver carp surimi on gelatinization characteristics of wheat flour dough during microwave heating. Differential scanning calorimeter (DSC) was used to determine the extent of gelatinization of wheat starch. It is observed that as surimi added into wheat flour dough it would take 95s to achieve the targeted temperature which was longer than 0% surimi-wheat flour dough with 5s. On the other hand, adding of surimi enhanced the uniformity of temperature distribution during microwave heating. Moreover, microwave heating lead to an increase of gelatinization temperature of pre-heated samples including T_O (onset temperature), T_P (peak temperature) and T_E (end set temperature). When the amount of silver carp surimi was increasing, the gelatinization rate of dough decreased slightly. The results indicated that silver carp surimi competed wheat starch with water during microwave heating.