伍佰艺奇楠一号组培苗的结香能力研究

目的:伍佰艺奇楠一号组培苗的结香能力。方法:采用伍佰艺奇楠一号组培苗和原发苗进行种植培养对照,检测其结香能力。结果:奇楠一号原发苗每株结香量为215g,其精油中定性检测出物质数量为42种,其主要有效物质的比例为:色酮类70.25%,芳香族5.69%,倍半萜类12.44%,而组培苗的每株结香量为206g,其精油中定性检测出物质数量为40种,其主要有效物质的比例为:色酮类69.33%,芳香族5.70%,倍半萜类11.56%。结论:伍佰艺奇楠一号组培苗的结香能力相近,可以推广应用。

河口县3种白木香品种结香能力比较

采用菌液通体结香、冷钻打孔结香,1年后通过薄层色谱鉴定和醇溶性浸出物的质量分析,比较了云南河口县3种白木香[Aquilaria sinensis(Lour.)Gilg]品种(白木香、凹身木、油叶子)的结香能力。结果显示:试验树体变色部位样品的薄层色谱鉴定均出现桃红色显色反应,对照白木部位薄层色谱鉴定无颜色变化,3个品种变色部位样品醇溶性浸出物含量沿树干由上向下呈现增高趋势,传统白木香品种变色样品醇溶性浸出物在树干上、中、下3个部位的含量均低于10%,而易结香品种凹身木和油叶子的树干上、中、下3个部位的含量远高于10%。白木香不同品种之间结香能力差异较大,油叶子结香效果最好,凹身木其次,传统白木香结香效果较差;同一棵树的不同部位,结香效果也不同,树体下部沉香含量较高,越往上含量越少。研究结果可为推广结香技术和易结香白木香品种提供了参考。

N-H…X(X=F,Cl,Br,and Ⅰ)hydrogen bonding in aromatic amide derivatives in crystal structures

Intramolecular N H···X (X=F, Cl, Br, and Ⅰ) hydrogen bonding patterns of aromatic amides in the solid state are summarized. It is revealed that the key for the formation of this kind of weak intramolecular hydrogen bonding in X-ray crystal structures is to suppress the competition of strong intermolecular N H···O C hydrogen bonding of the amide unit. For amides with identical backbones, the bonding capacity of halogen atoms as hydrogen bonding acceptors is in the order of F>Cl>Br>I, which is in accordance with their electronegativity strength. Generally, the five-membered hydrogen bonding is easier to form than the six-membered one.