Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed ...Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.展开更多
To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O ...To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O （152 MOS） single component was prepared by hydrothermal synthesis reaction in MgSO4 solution and NaOH solution. MgO whisker was prepared by heating treatment of the precursor at low heating speed to keep the structure of the precursor not be destroyed. The composition, the morphology and the structure of these whiskers were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that the MgO whisker was about 0.5-1.2 μm in diameter and 20-80 μm in length, with an aspect ratio no less than 100.展开更多
Micropropagation techniques were set up for walnut. Many plantlets were obtained by culturing node explants in MS medium,with 30 g/L sucrose, 7 g/L agar, and different concentrations of BA or Kin alone and different c...Micropropagation techniques were set up for walnut. Many plantlets were obtained by culturing node explants in MS medium,with 30 g/L sucrose, 7 g/L agar, and different concentrations of BA or Kin alone and different concentrations of BA ＋ NAA or BA ＋ Kin. BA at concentration （2 mg L-1 BA） gave the best results in percentage response and number of shoots/plant （100%, 2.84） respectively. While, Kin at 3 mg L-1 gave the highest average shoot length （2.81 cm）. However, MS medium supplemented with 2.5 mg L-1 ＋ 0.5 mg L-1 Kin gave the best results compared with all treatment shoot/explants and the highest number of leaves/explants （3.7, 8.2） respectively. While the highest length of shoot （4.7 cm） in MS medium supplemented with 3 mg L-1 Kin. and a high rooting percentage up to 60% at MS medium supplemented with 1 mg L-1 IBA （Indole-3-butyric acid） was obtained.展开更多
基金Supported partially by the China Ministry of Science and Technology for the China’s Agenda 21 Strategic Research (MOST,2008IM021900)the General Administration of Quality Supervision Inspection and Quarantine of the People’s Republic of China for the 4th Food Safety Research (AQSIQ 2008:ASPAQ0809)
文摘Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.
文摘To promote the scale-up production and industrial application of magnesium oxide （MgO） whiskers, MgO whiskers were prepared by the calcination method of the precursor. The precursor MgSO4·5Mg（OH）2·2H2O （152 MOS） single component was prepared by hydrothermal synthesis reaction in MgSO4 solution and NaOH solution. MgO whisker was prepared by heating treatment of the precursor at low heating speed to keep the structure of the precursor not be destroyed. The composition, the morphology and the structure of these whiskers were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that the MgO whisker was about 0.5-1.2 μm in diameter and 20-80 μm in length, with an aspect ratio no less than 100.
文摘Micropropagation techniques were set up for walnut. Many plantlets were obtained by culturing node explants in MS medium,with 30 g/L sucrose, 7 g/L agar, and different concentrations of BA or Kin alone and different concentrations of BA ＋ NAA or BA ＋ Kin. BA at concentration （2 mg L-1 BA） gave the best results in percentage response and number of shoots/plant （100%, 2.84） respectively. While, Kin at 3 mg L-1 gave the highest average shoot length （2.81 cm）. However, MS medium supplemented with 2.5 mg L-1 ＋ 0.5 mg L-1 Kin gave the best results compared with all treatment shoot/explants and the highest number of leaves/explants （3.7, 8.2） respectively. While the highest length of shoot （4.7 cm） in MS medium supplemented with 3 mg L-1 Kin. and a high rooting percentage up to 60% at MS medium supplemented with 1 mg L-1 IBA （Indole-3-butyric acid） was obtained.
