Papers by Keyword: Sucrose

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Authors: Yuan Yuan She, Xuan Yan Liu, Zhi Gao Yang
Abstract: Sucrose char sulfonic acid (SCSA) efficiently catalyzed the one-pot, three-component Mannich reaction of ketones, aromatic aldehydes and different amines in ethanol at 30°C and afforded the corresponding β-amino carbonyl compounds in good to excellent yields . This method provides a novel and improved modification of the three-component Mannich reaction in terms of mild reaction conditions , clean reaction profiles and a simple workup procedure.
Authors: S. Mehatab Nabi, N. Sagar Babu, Sujith Vijayan, Kuttan Prabhakaran
Abstract: A novel process for the preparation of a nickel foam from nickel oxide has been studied. The solid organic foam prepared by the thermo-foaming of a nickel oxide powder dispersion in molten sucrose is heat treated at the 1000 °C in an inert atmosphere to produce the nickel foam. The nickel foam produced has interconnected cellular structure with porosity ~ 94%.
Authors: Diego Pereira Tarragó, Célia de Fraga Malfatti, Vânia Caldas de Sousa
Abstract: For the combustion synthesis of strontium doped lanthanum manganite (LSM), different fuels can be used influencing the phase formation and also the powder morphology. Both are important features that can improve the material performance when used in a solid oxide fuel cell cathode. Urea and sucrose are fuels used to synthesize distinct LSM powders, thus the purpose of this work was to mix these fuels in order to obtain nanocrystalline LSM powders with a differentiated morphology, more convenient for the desired application. After calcination at 750°C for 3 hours the powder generated a pure phase LSM X-ray diffraction pattern and the micrographs taken in the transmission and scanning electron microscopes revealed a very peculiar morphology with specific surface area (BET) of 13 m²/g. Calcination led to a single phase and more crystalline material but showed no influence in the powder morphology.
Authors: P. Viriyavathana, W. Sawangjaitham, S. Suchat
Abstract: In this paper, the ellipsometry based on polarization technique used to determination of sucrose concentrates. And then we used multi-wavelength radiation from a halogen lamp provided spectral, is described and applied to the determination of optically active of sucrose. The instrument has no moving parts, and optical rotation measurements are an apparent absorbance. Apparent absorbance measurements can be combined with over a wide spectral range. Results obtained by this two technique have showed good.
Authors: Peng Sun, Qun Li Yu, Guo Liang Pei, Xian Feng Sun
Abstract: The effect of some materials including sucrose, peptone and yeast extract on growth of B. longum and B.adolescentis in the extract of Fructus tribuli was studied by measuring optical density at 600nm (OD600) and pH. The addition of sucrose, peptone and yeast extract was 0.0%-2.40%, 0-1.4% and 0-1.4%, respectively. Results were as follows: addition of sucrose, peptone and yeast extract could promote the growth of B. longum and B.adolescentis. The optimum concentration of sucrose, peptone and yeast extract in the extract of Fructus tribuli was 2.0%, 1.0% and 1.0% for B. longum and 2.20%, 1.0% and 0.8% for B.adolescentis
Authors: Luis Mayor, Ramón Moreira, Francisco Chenlo, Alberto M. Sereno
Abstract: Chesnut and pumpkin fruits were dehydrated with osmotic solutions of sucrose and NaCl at 25°C. These food materials have different structure, composition and porosity. Water loss and solids gain kinetics were experimentally determined and modeled using a diffusional model. In spite of the several mass transfer mechanisms taking place along with diffusion during osmotic dehydration, the modeling was satisfactory and involved effective coefficients of diffusion useful to quantify the different mass transfer fluxes. Water and sucrose transfer rates during osmotic dehydration with sucrose solutions are independent on the initial food material characteristics; however they seem to be related with the permeability of these components to a sucrose layer formed in the surface of the samples. In the case of osmotic dehydration with sodium chloride solutions, the coefficients of diffusion show a dependence on food material characteristic and higher values of these coefficients for pumpkin (more porous material) were found.
Authors: Chao Yang, Yong Mei Li, Shan Liu, Yao Chun Yao
Abstract: Two kinds of carbon sources and their mixtures with different proportions were employed to prepare the LiFePO4/C composite material by high temperature solid state method. Precursor materials with different carbon sources were prepared by planetary ball-milling without dispersant. Results showed that the various precursors had different effect on the uniformity of the mixing and the crystallinity of the LiFePO4/C positive material. The mixed carbon sources had better effects on the performance of positive material. When the ratio of sucrose and citric acid was 1:3 (75% citric acid), the discharge capacity of LiFePO4/C composite material was 144.1 mAh/g at the discharge rate of 0.2C. Its high-rate performance was also better.
Authors: Xiao Hui Wu, Meng Ting Geng, Jie Fan, Yuan Yao, Yi Min, Rui Mei Li, Xin Wen Hu, Shao Ping Fu, Jian Chun Guo
Abstract: The induction of tuberous roots of cassava in vitro is functional in MS medium containing 0.54 mM NAA, 0.44 mM BA and 3%-7% sucrose; meanwhile, the saccharide accumulation in the induced tuberous roots was increased with the sucrose content addition from 3%-7% in the inducible medium. Thus, the sucrose is an important factor for tuberous root induction in Cassava in vitro. The experimental results showed that the appropriate concentration of sucrose played a key role on the tuberous root induction in Cassava in vitro.
Authors: Li Wang, Yu Shan, Zong Lin Zhang, Guang Chuan Liang, Xiu Qin Ou
Abstract: Phase pure Li4Ti5O12/C composite was synthesized by sol-gel method using lithium acetate CH3COOLi•2H2O and tetrabutyl titanate [Ti(OC4H9)4] as starting materials, oxalic acid as chelating agent and sucrose as an additional carbon source. The as-prepared samples were characterized by means of TG-DTA, XRD and SEM. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling and high-rate dischargeability. SEM analysis indicated that the prepared Li4Ti5O12/C composite using sucrose and oxalic acid as carbon source showed a spongy nano-particle aggregate structure, with average nano-particle size of 80-100 nm. Electrochemical results showed that the Li4Ti5O12/C composite prepared in the presence of sucrose exhibited better electrochemical performance with specific discharge capacities of 204.7, 171.6, 155.3 and 154.6 mAh/g at 0.2C, 1C, 2C, and 5C rates, respectively. And the discharge capacity could still reach 143.9mAh/g after 80 cycles at 1C rate, exhibiting excellent cycling performance.
Authors: Chuan Dong Lu, Yuan Yuan Xiong, Jin Fang Zhao, Jin Hua Wang
Abstract: Currently, succinic acid produced from microbial fermentation has attracted great interests by many researchers, due to its low cost and friendly environmental benefits. Among various microbe, Escherichia coli species have been considered as suitable succinic acid-producing strains, which could utilized a wide range of substrate. In order to acquire sucrose-consumed strains, a genetically modified E. coli JH208 was constructed using the RED recombination system and the flipase recognition target (FRT) site-specific recombinant technology. In 48 h, the production of succinic acid from sucrose by JH208 is 48.46 g/L, the productivity is 1.01 g L-1 h-1, with a succinic acid yield of 0.83 g/g sucrose. The by-products were very low in the fermentation, acetic acid was 4.22 g/L, the ethanol concentration was less than 0.10 g/L, and formic acid and ethanol was not detected.
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