Advanced Materials Research Vols. 634-638

Abstract: Maillard reaction products (MRPs) were prepared by heating the solution containing L-ascorbic acid (ASA)and L-lysine (Lys)/ L-methionine (Met) adjusted to various pHs (4.0, 5.0, 6.0, 7.0 and 8.0) at 140±2°C for 2 h. The browning, intermediate products, reducing power and DPPH (1,1-diphenyl-2-picryl-hydrazyl) radical-scavenging activity reached a maximum with initial pH 5.0 (P < 0.05). Thereafter, slightly differences with initial pH of 7.0 and 8.0 were found. An increase in Ferrous ion chelating activity of MRPs derived from ASA-Lys/ Met model systems, as measured by absorbance at 562 nm, was observed as the initial pH increased (P < 0.05). In general , antioxidative activity of ASA-Lys/ Met MRPs was coincidental with the browning development and the formation of intermediate products.

Abstract: An efficient and environment-friendly macroporous resin column chromatographic separation method has been developed for preparative isolation of oxymatrine from alkaloids of Sophora flavescens Ait. in the present study. The static adsorption ratios of nine macroporous resins were evaluated. The results demonstrate that H103 macroporous resin, showing high adsorption and desorption capacity, is suitable for separation of oxymatrine. The optimal parameters are obtained: the H103 resins are packed with ethanol, height-diameter ratio (H/D in short) of H103 resin-packed chromatogram column is 33:1, the elution program is 30% C2H5OH-25% NH4OH (115:1, v/v) at flow rate of 2.0 mL/min. After isolation on resin column chromatography, target compound is adequately separated from interferences; the purity of oxymatrine is increased to 91.53% by GC-MS analysis and the recovery yield of oxymatrine is 78.19%.

Abstract: Isobaric liquid-liquid equilibrium tie-line data were determined at atmospheric pressure and at 283.15 and 313.15 K for the mixture (water + methanol +citral). The miscibility for the ternary (water + methanol + citral) LLE was increasing as the temperature increased. The experimental liquid–liquid equilibrium data have been satisfactorily represented by using an extended UNIQUAC model.

Abstract: The formulation of Difenoconazole Suspension Concentrates (SC) was optimized with the orthogonal design method.Results showed that the optimum formulation separation rate was 6.6% and the decomposition rate of the active ingredient was less than 3.0% in heated storage, and accorded with the requirements of SC. It would has broad application prospects for its safer, less toxic and more environmentally friendly.

Abstract: A novel method for rapid photochemical synthesis of substituted indanone based on an intra-molecular hydrogen transfer and enolization under irradiation with UV light was presented, which are of mild reactive conditions, quickness, simplification, high efficiency. The separation and purification of the photolyzed product are easy. Meanwhile, the reaction has the characteristics of green chemistry.

Abstract: Molecular distillation was applied in the separation of eucalyptus oil. The main factors of molecular distillation were analyzed. The influence of operating pressure was investigated when other parameters were unchanged. The results showed that the pressure around 850 Pa was optimum for the experimental conditions.

Abstract: There was rarely high-purity α-terpineol or pure-monomer α-terpineol in China due to difficulty in isolating α-terpineol and γ-terpineol. Aiming at the separation problem, α-terpineol was directional synthesized by one-step method in a uniform system. The influence factors of stereochemistry structure, thermodynamic analysis and stability of reactants, products and carbocations were researched, conducting the experiments in optimal reaction conditions. All the influence factors about generating trend of objective product α-terpineol and byproduct γ-terpineol were discussed and the reaction mechanism was studied. This paper provided certain theoretical basis on prepare high-purity α-terpineol.

Abstract: A lower salt resistance sulfomethylated phenol formaldehyde resin (LSMP) was synthesized. The dispersion properties of LSMP and influences of reaction conditions on its properties were investigated with dynamic light scattering technology, and means of viscosity and critical coagulating concentration (CCC) determination. The result shows that the viscosity of a 1.0 g•L-1 resin solution ranges from 0.8036 mPaּs to 0.8705 mPaּs, and unit in distilled water exhibits a hydrodynamic diameter between 8.5 nm and 123.4 nm and a Zeta potential varying from -76.05 to -21.12 mV under different reaction conditions. The dispersing system of LSMP in water is a kind of colloid solution and electrolytes can weaken the resin dispersion and make the resin flocculate, and the solution of LSMP in water is hypersensitive to positive ions and effects of positive ions will be more obvious with increasing valence of ions.

Abstract: The thermal isomerization reaction of isopimaric acid was studied by a treatment at different temperature of 250 °C, 260 °C and 270 °C for 1-5 h under the protection of nitrogen. The isomerization mechanism of isopimaric acid was illuminated. Isopimaric acid was remarkably isomerized to 8, 15-isopimaric acid and sandaracopimaric acid, the higher thermal treatment temperature combined with longer thermal treatment time, the faster isomerization rate of isopimaric acid was observed. It was found that the isomerization rate of isopimaric acid towards 8, 15-isopimaric acid was faster than to sandaracopimaric acid. The decomposition reaction of pimaric-type acids occurred slightly in conditions of 250 ~ 270 °C.

Abstract: A phosphorus-containing flame retardant 2,6,7-trioxa-1-phospha bicycle [2,2,2] octane-4-carboxylic acid 1-oxide (PBCC) was synthesized. The structure and the thermal stability of the compound were characterized by infrared spectroscopy (IR), nuclear magnetic resonance (1HNMR and 13PNMR), mass spectroscopy (MS), elemental analysis, and thermogravimetric analysis (TGA).Using a static analytical method, the solubilities of PBCC in ethanol in the temperature range from 298.90 to 343.20 K and in water in the temperature range from 298.85 to 363.20 K were determined. The solubilities of PBCC in methanol and acetonitrile1 were also measured for comparison. The solubility data were correlated with an empirical equation.