A new method for the determination of toosendanin in the bark of Melia toosendan sieb.et zucc.by reversed-phase high performance liquid chromatography（RP-HPLC）with MeOH-H2O as the mobile phase at 215 nm of the uv-vi...A new method for the determination of toosendanin in the bark of Melia toosendan sieb.et zucc.by reversed-phase high performance liquid chromatography（RP-HPLC）with MeOH-H2O as the mobile phase at 215 nm of the uv-vis wavelength was investigated.A good seperatioin of toosendanin with matrix was obtained within 20 min by using Eclipse XDB-C8 column.The linear regression equation for peak area-toosendain concentration is A=20.818C-31,r=0.9997.展开更多
以油菜籽和甲醇为原料,在甲醇的超临界状态下进行原位萃取-酯交换反应制备生物柴油,研究了产物的主要组成以及反应温度、反应压力和原料比对生物柴油产率的影响。结果表明,产物主要由亚油酸甲酯、油酸甲酯、棕榈酸甲酯、硬脂肪酸甲酯和...以油菜籽和甲醇为原料,在甲醇的超临界状态下进行原位萃取-酯交换反应制备生物柴油,研究了产物的主要组成以及反应温度、反应压力和原料比对生物柴油产率的影响。结果表明,产物主要由亚油酸甲酯、油酸甲酯、棕榈酸甲酯、硬脂肪酸甲酯和亚麻酸甲酯构成;并发现反应温度、反应压力以及菜籽与甲醇的质量比是影响甲酯产率的主要因素,在菜籽与甲醇质量比为1∶4,反应压力和反应温度分别为14 MPa和280℃时,萃取和酯交换反应可同时在10 m in内完成,且油菜籽中所含的油脂转化率可达到94.3%。展开更多
文摘A new method for the determination of toosendanin in the bark of Melia toosendan sieb.et zucc.by reversed-phase high performance liquid chromatography（RP-HPLC）with MeOH-H2O as the mobile phase at 215 nm of the uv-vis wavelength was investigated.A good seperatioin of toosendanin with matrix was obtained within 20 min by using Eclipse XDB-C8 column.The linear regression equation for peak area-toosendain concentration is A=20.818C-31,r=0.9997.
文摘以油菜籽和甲醇为原料,在甲醇的超临界状态下进行原位萃取-酯交换反应制备生物柴油,研究了产物的主要组成以及反应温度、反应压力和原料比对生物柴油产率的影响。结果表明,产物主要由亚油酸甲酯、油酸甲酯、棕榈酸甲酯、硬脂肪酸甲酯和亚麻酸甲酯构成;并发现反应温度、反应压力以及菜籽与甲醇的质量比是影响甲酯产率的主要因素,在菜籽与甲醇质量比为1∶4,反应压力和反应温度分别为14 MPa和280℃时,萃取和酯交换反应可同时在10 m in内完成,且油菜籽中所含的油脂转化率可达到94.3%。
