银杏萜内酯在反相高效液相色谱中保留行为

以水 -甲醇为流动相和InertsilODS3为固定相 ,系统地研究了银杏萜内酯的反相高效液相色谱上保留行为。研究表明 ,银杏萜内酯容量因子的对数和流动相中甲醇含量呈线形关系 ,其相关系数γ大于 0 .965。     

α-蒎烯阳离子聚合工艺的改进

以A lC l3/SbC l3为催化剂,用SbC l3逐步滴加方式,通过两步聚合工艺制备了α-蒎烯树脂。通过正交实验,对α-蒎烯调控聚合的各影响因素进行了研究。结果表明,与传统的一步聚合工艺相比,该工艺在保持单体高转化率的同时,使聚合反应变缓,避免了由于反应过快而引起的聚合产物中低聚体含量高,Mn下降的现象;有效提高了聚合物的软化点;降低了聚合物的色值。在优化工艺条件下,催化剂用量比传统工艺减少30%以上,制得的α-蒎烯树脂软化点为138℃(环球法),色泽3(铁钴色),得率达81.0%,软化点提高8℃以上,色泽降低2级以上。产品各项指标均超过了我国行业标准LY/T1453—1999特级水平。     

Foliage constituents of douglas fir (Pseudotsuga menziesii (Mirb.) Franco (Pinaceae)): Their seasonal variation and potential role in douglas fir resistance and silviculture management

Seasonal changes in the production of primary nutrients (soluble carbohydrates) and secondary metabolites (terpenes, monomeric phenolics, and tannins) in the current needle tissue of Douglas fir were investigated. All four classes of compounds showed significant seasonal changes in concentration during foliage development. Most terpenes increased significantly in concentration from June 11 to August 3, and then showed declining concentrations to September 20. The most dramatic and significant seasonal increases occurred in-pinene, camphene, and bornyl acetate concentrations. The monomeric phenolics chlorogenic acid, taxifolin glucoside, quercetin galactoside, and those unknown phenolics showed an overall trend of declining in concentration from June 11 through September 20. However, considerable variation between sampling dates in the concentration of these phenolics was noted. Tannin concentration decreased significantly from June 11 to July 9, and then increased in concentration to the September 20 sampling date. Fructose, galactose, glucose, and sucrose tended to decrease from June 11 to September 20. However, significant variation between sampling dates was evident in these compounds as well. Galactose was the major compound in the soluble carbohydrate fraction, amounting to almost 80% of the total concentration throughout the growing season. These data suggest that if phenolics and tannins function as defenses, they would only affect second- and possibly third-instar budworm larvae during the time that these instars mine the buds. Camphene,-pinene, and bornyl acetate increased in concentration throughout the growing season and may be effective deterrents to the budworm. Both bornyl acetate and camphene have been shown in field and laboratory studies to increase larval mortality and adversely affect budworm larval growth. Carbohydrates generally act as nutrients that enhance herbivore growth. However, in a previous study, galactose was found to cause reduced budworm larval growth and increased larval mortality.     

NIR光谱法快速分析总黄酮醇苷和萜类内酯

采用NIR法和化学计量学方法构建了银杏叶片中的总黄酮醇苷和萜类内酯含量的定量分析模型。通过PLS建立数学模型,并对预测集样品进行预测。39份样品经交叉验证建立校正模型,RSMECV分别为0.104和0.063。R分别为0.978 8和0.961 9。用13份样品进行预测,R达0.919 9和0.931 8,RSMEP分别为0.107和0.105。该方法简便快速,结果准确,可应用于不同批次银杏叶片样品的进行快速检查或质量控制。     

湿地松树皮挥发油中的萜类化学成分分析

采用常压水蒸气蒸馏法提取了湿地松树皮挥发油,得油率为0.25%,通过GC/MS方法对该精油进行了定性定量分析.共分离出58个峰,鉴定出25个萜类化合物,占该精油总量的78.92%.其中含量最高的化合物是石竹烯醇,占20.82%;其次含量比较高的几种化合物分别是α松油醇(8.36%),n.杜松醇(7.22%),氧化石竹烯(6.74%),龙脑(5.13%).     

Emissions from sawdust in packed moving bed dryers and subsequent pellet production

This study quantifies emissions of hydrocarbon terpenes from the drying of sawdust in packed moving bed dryers, through the production chain to the finished pellets, and determines the parameters suitable for emission control. The terpene content in softwood sawdust and pellets was analyzed using gas chromatography. The distribution of VOC emissions over the bed was measured with a flame ionization detector. After drying, 30–40% of the initial terpenes remain in the wood, 20–30% remain after grinding, and 10–15% remain after pelleting. Dryer emissions correlate with residence time and final sawdust moisture content. Pellet press emissions correlate with pellet moisture content.     

萜烯树脂乳液对聚氨酯乳液性能的影响

分别采用预聚法和直接乳化法制备了水性聚氨酯乳液和萜烯树脂乳液,讨论了萜烯树脂乳液的用量对聚氨酯乳液及胶膜性能的影响。结果表明,当加入萜烯树脂乳液质量分数为25%时,聚氨酯乳液的粘度和胶膜的拉伸强度均达到最大值,分别为20.1mPa.s和15.70MPa,胶膜伸长率达到377%,其用量再增大时,伸长率增加不明显;胶膜剥离强度在萜烯树脂乳液质量分数为30%时达到最大值9.87N/cm;当萜烯树脂在质量分数低于20%时,胶膜吸水率变化较小,超过20%后胶膜吸水率增大。     

Hierarchical self-assembled hollow hydroxyapatite flower microspheres containing terpene functional groups for efficient drug loading and pH-responsive drug release

In this paper, we fabricated hierarchical self-assembled hollow rose-like flower microspheres (HRFM) and hollow burr-like flower microspheres (HBFM) hydroxyapatite (HAP) using dehydroabietyl phosphate tri-ester (DDPT) as an organic phosphorus source, a regulating agent, and a soft template simultaneously via a one-step solvothermal method. The HBFM and HRFM have been explored for their application in drug delivery, using doxorubicin (DOX) as a drug model. The formation mechanisms of HRFM and HBFM were proposed on the basis of the electrostatic potential diagrams and self-assembled behavior of DDPT organic molecule. After the rosin-based terpene functional groups were incorporated, both HRFM and HBFM exhibited low cytotoxicity against Hela cell, pH-dependent sustained drug release properties, and high drug loading capacity. The drug-loading capacities of HBFM and HRFM were 116.6?mg?g^?1 and 148.3?mg?g^?1, respectively. Thus, the as-prepared HRFM and HBFM are promising for the applications in drug delivery.     

Induction of pseudopterosin biosynthesis in the gorgonian Pseudopterogorgia elisabethae

A number of biological and physical stimuli have been evaluated as inducers of pseudopterosin biosynthesis in the sea whip Pseudopterogorgia elisabethae. Data indicate that the production of pseudopterosins can be significantly increased in response to high levels of predation by the mollusk Cyphoma gibbosum and in response to decreased levels of UV/visible radiation. High levels of feeding by Chaetodon capistratus and an artificial wounding of the sea whip did not result in increased pseudopterosin levels.