北柴胡挥发油的成分研究Ⅰ.

柴胡为常用中药,有解热、镇痛、利胆等作用。近年来,一些地区将水蒸馏液制成注射剂用于治疗感冒等症。柴胡原植物品种比较复杂,本属约有100余种。我国约有36个种,17个变种及7个变型。Bohlmann等曾从摩洛哥柴胡(B.gibraltaricum Lusitan)根中分离出当归酯(angelic acid ester)。其后Ashraf等又从线叶柴胡(B.linearifo-lium DC。)种子中分离出α-檀烯(α-santene),罗勒烯(ocimene),α-萜品醇(α-terpineol)     

聚合物减阻对多相流传热的影响研究

本文采用内径为40 mm的API X52石油管,建立了包括水平管,倾斜上升管、倾斜下降管和垂直上升管等不同管型的实验回路,实验研究了不同管型中聚合物的减阻性能及其对多相流传热的影响,分析了多相流减阻率与传热降低率两者间的相互关系.研究发现,聚合物减阻对于多相流传热的影响,因不同的管道型态而具有不同的变化规律;减阻率为6...     

北柴胡挥发油的成份研究I.

The chemical constituents of essential oil from the roots of Bupleurum chinense DC. were examined by means of GC-MS technique combined with preparative GC TLC and IR. As a result of the analyses, twenty components were identified namely: pentanoic acid, caproic acid, heptanoic acid, 2-heptenoci acid, caprylic acid, 2-octenoic acid, pelargonic acid, 2-nonenoic acid, phenol, cresol, ethylphenol, thymol, eugenol, 0-methoxyphenol, γ-heptalactone, γ-octalactone, γ-decalactone, γ-undecalactone, messoialactone and vanillin acetate.