共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
白芷挥发性成分的GC-MS分析 总被引:1,自引:0,他引:1
研究白芷挥发油化学成分。采用水蒸气蒸馏法提取白芷挥发油,利用GC-MS技术分析其挥发油成分。共检出40个色谱峰,并鉴定其中38种成分。白芷挥发油中的主要化学成分为醚类成分,占挥发油总量61.14%,其次为不饱和烃类化合物,占挥发油总量的20.03%。 相似文献
3.
三种理气类中药挥发性成分的GC-MS分析 总被引:2,自引:0,他引:2
研究了三种(厚朴、檀香、木香)理气类中药挥发油的化学成分。用水蒸气蒸馏提取三种药材的挥发油,用GC-MS分离检测其化学成分,并结合气相色谱程序升温指数辅助定性确定出挥发油中的化学组分。鉴定出木香挥发油中29个成分(占挥发油总量的92.00%);厚朴挥发油中26个成分(占挥发油总量的91.88%);檀香挥发油中10个成分(占挥发油总量的94.51%),三中药物挥发油的主要成分大不相同。计算了各种化合物的保留指数,使用保留指数辅助定性鉴定出的化合物所占挥发油百分含量明显多于文献中所报道的数据。 相似文献
4.
5.
目的:对浙江、四川、江西、昆明、湖南、江苏、安徽7个产地石菖蒲挥发油中主成分及其含量进行研究。方法:采用水蒸汽蒸馏法提取挥发油,用GC-MS联用技术对其化学成分进行分离鉴定,并运用面积归一化法确定各个成分的相对含量。结果:各产地的石菖蒲挥发油中分别鉴定出了34、44、46、39、41、46、40个化合物,分别占分离总成分的86.61%、82.37%、79.33%、80.18%、76.1%、75.31%、72.88%,已鉴定的成分中共同化合物16个,化合物总量为64个。结论:不同产地石菖蒲挥发油中主要成分均为苯丙素类、单萜类等成分,但其含量存在显著差异,为石菖蒲的开发和质量控制提供了理论依据。 相似文献
6.
7.
8.
富含黄樟素的树胡椒 (Piperhispidinervum)无性后代扦插树叶油化学成分保持着母本的特性 ,主成分黄樟素含量无明显的变化、其它成分基本一致。有性繁殖后代实生树叶油成分发生了很大的变化 ,成分比母树复杂 ,主成分黄樟素低 ,仅为 32 .2 0 %— 4 1.95 % ,而肉豆蔻醚 (2 1.5 5 %— 2 9.4 1% ) ,肉豆蔻醚异构体 (8.0 8%— 10 .6 2 % )、芹菜脑 (4.6 0 %— 6 .74 % )、c- β -罗勒烯 (1.0 9%— 2 .37% )等在母树叶油中未发现。 相似文献
9.
三种黄皮属植物叶挥发油化学成分的研究 总被引:10,自引:0,他引:10
利用水蒸气蒸馏法分别提取了3种黄皮属植物齿叶黄皮、黄皮和光滑黄皮叶的挥发油,经毛细管气相色谱-质谱联用仪 (GC-MS)分析,分别分离出38、81和28个峰,鉴定了其中的34、62和19种成分,所鉴定成分占挥发油总量的99.64%、92.85%和94.40%。挥发油的主要成分是单萜、倍半萜、酚类衍生物和脂肪族类化合物。 相似文献
10.
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
12.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
14.
15.
16.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
17.
18.
19.
20.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献