排序方式: 共有20条查询结果,搜索用时 15 毫秒
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采用常压水蒸汽蒸馏法提取了吉安县杉木加工过程中产生的碎屑精油,该精油具有典型的木香香气,其中得油率为1.0%~1.5%.用GC—MS法对该油进行了定性定量分析,在分出的65个色谱峰中共鉴定出49种化合物,占精油总量的92.8%,其中含有柏木醇(39.98%)、a-柏木烯(10.17%)、雪松烯(5.59%)、乙酸柏木酯(3.35%)、5-(7a-异丙烯基-4,5-二甲基八氢化茚-4-基)-3-甲基-2-戊烯-1-醇(3.22%)、[S-(E,E)]-1-甲基-5-亚甲基-8-异丙基-1,6-环癸二烯(2.97%)、杜松醇等. 相似文献
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杉根精油分离及其化学成分测定 总被引:2,自引:0,他引:2
用干馏工艺扩试提取杉根精油,干馏釜3m3,干馏温度105~420℃,时间6.0h,产品得率为6.08%,是水蒸气蒸馏提取方法的3倍。产品相对密度(25℃)为0.9912~1.021,折射率nD20为1.4799,旋光度+0.5°。应用GC法对100~250℃的精油化学成分进行了分析,分出41个色谱峰,共鉴定出39个化合物,占该精油总质量的99.16%,其中主要成分为α-蒎烯3.8010%(质量分数,下同),d-柠檬烯2.8893%,β-松油烯7.1880%,长叶烯10.4162%,β-石竹烯4.2064%,α-木罗烯3.017%,β-松油醇2.876%,β-榄香烯4.5719%,柏木醇31.5087%,愈创木醇6.1426%,实验结果表明,精油化学成分及含量因树龄、树的部位、提取工艺不同,差异很大。 相似文献
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Mark A. Smith Haixia Zhang Randy W. Purves 《Journal of the American Oil Chemists' Society》2014,91(8):1313-1322
Plant oils rich in oxygenated fatty acids (FAs) are of interest as renewable raw materials for industry. Previous studies reported unusual oxygenated FAs in the seed lipids of Plantago major and P. ovata. To determine if oxygenated FAs are a common component of Plantago seed oils, seed fatty acyl quality and quantity were determined for 23 Plantago species. Fatty acyl content, as a percentage of dry weight, ranged from 4.9 % in P. sempervirens to 18.8 % in P. coronopus. Oxygenated FAs were a frequent, but not ubiquitous component of Plantago seed lipids, reaching a level of almost 15 % in the seeds of P. nivalis. The oxygenated FAs were identified as isoricinoleic acid (9-hydroxy-cis-12-octadecenoic acid, IR) and 9-oxo-cis-12-octadecenoic acid (OX). When present, most species contained both IR and OX. FAs containing oxo groups have not been reported as components of the seed oil of other plant species that synthesize IR or ricinoleic acid (12-hydroxy-cis-9-octadecenoic acid), suggesting unique aspects to the pathway of oxygenated FA biosynthesis in Plantago. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) demonstrated that IR and OX are components of triacylglycerol, and triacylglycerol estolides are a minor component of the seed oil of P. lanceolata with secondary acylation by oxygenated FAs. 相似文献
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大别山野生四叶参营养成分分析 总被引:1,自引:0,他引:1
测定大别山野生四叶参中水分、脂肪、总糖、蛋白质、氨基酸、常量元素和微量元素含量.采用恒重法测定水分含量;索氏提取法测定脂肪含量;斐林试剂热滴定法测定总糖含量;全自动凯氏定氮法测定蛋白质含量;柱前衍生反相高效液相色谱法测定氨基酸含量;原子吸收分光光度法测定Ca、Mg、Cu、Zn、Fe、Mn、Se含量;可见分光光度法测定P含量,测定结果显示:四叶参中水分、粗脂肪、总糖、粗蛋白质含量分别为6.55、3.31、54.83、9.15 g/100g;氨基酸至少有12种,总氨基酸含量为5.15 g/100 g,必需氨基酸含量为0.70 g/100 g.微量元素Cu、Zn、Fe、Mn、Se的含量分别为:1.19、3.64、20.01、22.09、6.82 mg/100 g.常量元素Ca、Mg、P含量分别为:0.15、0.11、0.96 g/100g.大别山野生四叶参营养成分丰富,具有广阔的开发应用前景. 相似文献