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Liu X.,Nanjing University of Finance and Economics | Liu X.,Jiangsu Provincial Key Laboratory of Quality Controls and Deep Processing on Grain and Oil | Gao M.,Nanjing University of Finance and Economics | Gao M.,Jiangsu Provincial Key Laboratory of Quality Controls and Deep Processing on Grain and Oil | Chen M.,Nanjing University of Finance and Economics
Journal of the Chinese Cereals and Oils Association | Year: 2013

This article briefly described the research progress of ionic liquid aqueous two-phase system in the biological extraction and separation and its classification, characteristics, application objects; Used the bibliometrics methods, it briefly conducted statistical analysis for the ionic liquids aqueous two-phase system's research literature published in domestic and foreign over the past decade; It discussed the research progress in the phase mechanism of the ionic liquid aqueous two-phase system and the mechanism of the extraction separated protein. Thermodynamic studies indicated that hydrophobic interactions were the main driving force for the transfer of the proteins, although in which the most important were electrostatic interactions and salting-out effects; Thus the application specified the situation and development trend of China aqueous two-phase study of the ionic liquid; and we out looked the application prospects of ionic liquids aqueous two-phase system in bio-separation. Source


Liu X.,Nanjing University of Finance and Economics | Liu X.,Jiangsu Provincial Key Laboratory of Quality Controls and Deep Processing on Grain and Oil | Chen M.,Nanjing University of Finance and Economics | Zhao Z.,Nanjing University of Finance and Economics | And 7 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2013

we designed a new technique with acorn starch as raw material and NaIO4 as oxidant, and prepared the dialdehyde starch (DAS) by two techniques of homogeneous oxidations which were micro-emulsion and ultrasound activation. And then we studied in this paper the influences of acorn starch size and purity, pretreatment temperature, micro-emulsion and its dosage, ultrasonic activation and NaIO4 oxidation on the synthesis of DAS. It was the first time to propose the approach of DAS preparation by micro-emulsion and ultrasound activation, which was followed by the discussion about their principles. The results of orthogonal tests showed that, pretreatment temperature was 50~60°C when the aldehyde content was regarded as the indexes; the emulsion system was better with non-ionic surfactant (polyvinyl pyrrolidone K30) and dodecyl trimethyl ammonium bromide/n-butanol /water; the optimal ultrasonic activation conditions of starch mild were that: activation temperature of 50°C, activation time of 45 minutes, ultrasonic power of 40 W and ultrasonic frequency of 40 kHz. In NaIO4 oxidation experiments, the optimal conditions were as follow: reaction temperature of 45°C, reaction time of 3 h, pH of 3.5~4.0 and re(NaIO4) to n (starch) ratio of 0.8:1.0. The prepared DAS aldehyde content in the optimal conditions was up to 98.56%. The prepared DAS consisted with that described in the literatures by the spectral and physicochemical properties detections. Source


Liu X.,Nanjing University of Finance and Economics | Liu X.,Jiangsu Provincial Key Laboratory of Quality Controls and Deep Processing on Grain and Oil | Liu X.,National Engineering Laboratory for Food Storage and Transportation | Yuan L.,Nanjing University of Finance and Economics | And 14 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2014

In order to explore the precision determination of mbustion enthalpy of cerceal, improved oxygen bomb calorimetry has been designed. The determination optimal conditions were as the follows: moisture content≤ 13%, alloy ignition wire, mbenzoic acid: msample=(2~1)∶1, the sample total mass 0.80 g, the tableting pressure 0.7 MPa and the oxygen pressure 2.0 MPa. The results showed that success rates of the ignition and precision had been both improved significantly. The combustion enthalpy of different storage time, varieties, production places and particle sizes were determined. The results showed that the combustion enthalpies of rice, paddy, millet and rice husk have changeable correlation with different producers; the regularities of combustion enthalpies of different varieties of rice were Indica rice (including glutinous rice)>japonica rice; and the same varieties were colored rice>white rice, brown rice>standard japonica rice 2>standard japonica rice 1, late japonica rice 2>late japonica rice 1, rice husk>millet>paddy>rice. The change of the particle size should go along with the alteration of combustion enthalpy; the rice combustion enthalpy was decreased with prolonged storage time increasing, and the combustion enthalpy decreased significantly when rice aging. The combustion enthalpy could be a supplementary indicator to judge whether rice reaches aging or not, while further research was needed to judge the relationship between combustion enthalpy and other storage qualities. Rice combustion enthalpy is indicated to be almost constant on the safe storage condition. Source


Liu X.,Nanjing University of Finance and Economics | Liu X.,Jiangsu Provincial Key Laboratory of Quality Controls and Deep Processing on Grain and Oil | Liu X.,National Engineering Laboratory for Food Storage and Transportation | Yuan L.,Nanjing University of Finance and Economics | And 15 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2014

The dialdehyde starch (DAS), NaIO4 as the oxidant, has been prepared to produce dialdehyde starch with potato starch in Virtual Homogeneous Phase system under UV irradiation. The optimum conditions were obtained by single factor test and orthogonal test: time 2.5 h; temperature 40°C; pH 3; the concentration of NaIO4 0.5 mol/L. The mass ratio of dialdehyde of the product was 97.68%, along with the yield of 85.65% on the optimum conditions. The results of IR and UV-VIS spectroscopy experiments, polarized light microscopy experiments, colorimetric experiments, physical and chemical experiments showed that the product was DAS with good quality; UV irradiation was beneficial for preparation of dialdehyde starch by the measurement; the result was better with lower wavelength but higher power. In activation stage, UV irradiation, which could improve the activation of starch, compared to the results in the absence of lights, increased the yield of DAS from 71.82% to 82.01% and the mass ratio of dialdehyde from 80.78% to 92.87%. The sequence of effects of light activation was: 254 nm> 365 nm> no lights. In oxidation reaction stage, UV irradiation, which could promote the DAS generation, increased the yield of DAS about 5.66% to 8.85% and the content of dialdehyde about 2.53% to 8.68%. The sequence of effects of light oxidation catalyst was: 254 nm /25 W>254 nm/15 W> 365 nm/25 W>365 nm/15 W>no lights. Source

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