Chemical constituents and cytotoxicity assay research in small polar substances from Vitis thunbergii var. taiwaniana

该文对小叶山葡萄地上部分化学成分进行了研究,运用硅胶柱色谱,OdS中低压柱色谱,SEPHAdEX lH-20凝胶柱色谱,分析型和制备型HPlC从小叶山葡萄60%乙醇提取物大孔树脂95%乙醇-水洗脱部位分离得到12个化合物,利用高分辨质谱,核磁共振等波谱手段鉴定其结构分别为:(1)bETulInIC ACId,(2)2,2,2'-bIS(4-HydrOXyPHEnyl)PrOPAnE bIS(2,3-EPOXyPrOPyl)ETHEr,(3)ErIOdICTyOl,(4)TrAnS-ε-VInIfErIn,(5)(+)-CIS-ε-VInIfErIn,(6)kObOPHEnOl A,(7)AMPElOPSIn A,(8)nEPAlEnHEnOl,(9)CIS-MIyAbEnOl C,(10)CIS-VITISIn b,(11)CIS-gnETIn H和(12)(+)-HOPEAPHEnOl。化合物2,5,6,8,9,10,11均为首次从为葡萄属中分离得到的化合物,化合物3,7,12为首次从小叶山葡萄中分离得到的化合物。在作用浓度为50μMOl·l-1下,化合物6,7和11对MCf-7(乳腺癌细胞株)具有较明显的体外生长抑制作用,其抑制率分别为66.58%,57.16%,52.84%。This article studied the chemical constituents from the aerial part of Vitis thunbergii var.taiwaniana.The 60% ethanol extract was eluted with 95% ethanol though HP-20 macroporous adsorption resin column.12 compounds,including( 1) betulinic acid,( 2) 2,2,2'-bis( 4-hydroxyphenyl) propane bis( 2,3-epoxypropyl) ether,( 3) eriodictyol,( 4) trans-ε-viniferin,( 5)( +)-cis-ε-viniferin,( 6) kobophenol A,( 7) ampelopsin A,( 8) nepalensinol B,( 9) cis-miyabenol C,( 10) cis-vitisin B,( 11) cis-gnetin H and( 12)( +)-hopeaphenol,were separated by using normal phase silica gel,ODS,Sephdadex LH-20 column chromatographies and semi-preparative or preparative HPLC.Compounds 2,5,6,8,9,10,11 were separated from the genus Vitis for the first time and compounds 3,7,12 were separated from Vitis thunbergii var.taiwaniana for the first time.At a concentration of 50 μmol·L-1,compound6,7 and 11 showed strong cytotoxicity against MCF-7 cell lines with the inhibition rate of 66.58%,57.16%,52.84%,respectively.国家自然科学基金青年基金项目(81202419

替代燃料二甲醚的燃烧特性及其污染物甲醛的生成消耗机理研究

Petrochemical fuel is not a renewable energy and it could not afford the power for the development of global economy, science and technology for ever. The study on clean alternative fuel which could substitute the petroleum and fuel deriving from it, has been an important measure for enhancing the security of energy supply, reducing pollution and dealing the problem of climate change with the considering from point of view of sustainable development and energy development strategy. And it has also become a hotspot which causing great attention.</span

煤与生物质液排渣混烧特性的数值模拟

提出将液排渣低尘燃烧和混烧技术相结合的思路，并在自行编制的包含颗粒沉积、附壁燃烧及渣层流动等子模型的燃烧计算程序中加入生物质的热解和燃烧动力学模型，采用数值模拟手段对煤和木粉的液排渣混烧特性进行理论分析．对150kg／h燃料量的圆筒形燃烧器内燃烧特性的计算结果表明，添加25％（ω）木粉可以提高燃烧初始段的温度，有利于充分利用燃烧器的前部空间，可以加大燃烧初始阶段的反应速度，改善煤粉的着火性能，提高煤粉的空间燃尽及附壁燃尽效果，总体燃尽率提高5％，从而有利于颗粒在有限的空间内进行充分燃烧及原有煤粉燃烧装置的小型化改造或设计．理论分析研究证明，将混烧和液排渣低尘燃烧技术相结合，充分发挥两者的优势，用于工业窑炉洁净燃烧技术的开发是可行的

Study on gasification kinetic parameter of biomass char based on iso-conversional method under CO_2 atmosphere

The isothermal gasification tests of rice straw char and wood chip char were carried out under CO2 atmosphere,using the thermo-gravimetric analyzer（TGA） over the temperature range of 800~950 ℃. The gasification reactivity of two chars increased with the

Effects of Pyrolysis Conditions on Gasification Reactivity andMethods Acquiring Kinetic Parameters of Isothermal Gasification forBiomass Char

Biomass gasification is a key point in the research of biomass utilization. Biomass gasification process includesbiomass pyrolysis and char gasification. Different char with different reactivity will be made by different pyrolysis processfor the biomass

Modeling study on the biomass char gasification kinetics under CO2 atmosphere:Ⅱ. Pre-exponential factor

基于简单碰撞理论，建立了生物质焦炭CO2气化反应速率的计算方法，找出了表征指数前因子大小的关键组合参数。在此基础上，对六种生物质及其脱灰焦炭的物理化学特性进行了检测分析，利用热重分析仪在800-1 000℃对各种生物质进行了CO2等温气化实验，将得到的指数前因子实验数据与模型分析结果进行对比。研究表明，指数前因子与构建的组合参数之间存在较好的相关性，建立的通用关系式可为气化反应规律的进一步阐明提供有益的参考

基于简单碰撞理论的生物质焦炭气化反应的活化能

The isothermal gasification of eleven raw biomass chars and six acid-washed biomass chars was performed under CO2 atmosphere, using a thermo-gravimetric analyzer （TGA） over the temperature ranges of 750- 1000 ℃ and 800- 1000 ℃, respectively. The dimensio

二甲醚燃烧的甲醛生成特性实验研究

针对二甲醚平面预混火焰，实验研究了燃料当量比和燃料流量对燃烧过程中甲醛产生和排放特性的影响。实验结果表明，甲醛是二甲醚燃烧过程一个重要的中间产物，在火焰面中大量生成，但其中大部分甲醛迅速被氧化消耗；二甲醚燃烧过程中甲醛的生成受燃料当量比和火焰温度影响明显，欠氧（燃料当量比Ф〈1）预混合燃烧的甲醛生成显著高于富氧（Ф〉1）燃烧；燃料当量比一定时，随着燃料流量增加，火焰中的甲醛浓度升高

Study of temperature and bum-out characteristics of methane premixed microflame array combustor with different nozzle center distance

With the same fuel load and nuzzle physical conditions, a numerical model of methane premixed microflame array combustor was built to optimize the combustion heating system of micro array flame. The temperature and burn-out characteristics with differen