, 2009 采用气相色谱/质谱(GC/MS)联用的方法,对林麝麝香中的甾体成分进行分析,确定了林麝麝香样品含有多种甾体成分的结构,并分析了不同来源的林麝麝香的麝香酮及甾体成分。通过检索NIST05质谱库,进一步确定了麝香中含有16种甾体成分。利用外标法、标准曲线法同时测定了麝香样品中3种甾类成分(胆固醇、苯胆烷醇酮及麝香酮)的含量,麝香酮的定量分析显示所有样品麝香中麝香酮含量均较高(30.1～45.2mg/g),但甾类成分含量波动较大。聚类分析显示,9个麝香样品聚为两支。利用GC/MS技术检测麝香成分的方法 ...
岳碧松 +4 more
core
[Integrated pharmaceutical innovation experiment： preparation of molecularly imprinted polymers and the application in sample pretreatment for in vivo drug analysis]. [PDF]
Se PuJiang Y +5 more
europepmc +1 more source
, 1992 激光沉积陶瓷薄膜是获取高技术薄膜(如超导薄膜)的新方法。激光诱导的材料蒸汽羽的光谱分析对形成薄膜性质的判断和激光与材料相互作用机理的研究都具有重要意义。为分析简单起见,我们用石墨作为靶材,用YAG激光器、真空室和OMA系统实现了不同能流密度条件下蒸汽羽的时/空分辨的光谱分析 ...
赵建荣, Peter K.Schenck
core
[Research progress on high performance liquid chromatography stationary phases based on mixed mode]. [PDF]
Se PuLi SJ, Li Z, Tang ZX, Lyu M, Wang LT.
europepmc +1 more source
, 2015 天然气水合物是一种重要的潜在能源。用激光拉曼光谱法表征气体水合物能够为研究水合物形成机理和开采方法提供重要信息。系统介绍了激光拉曼光谱法的基本原理,综述了激光拉曼光谱仪在气体水合物微观表征上的各种实际应用。通过激光拉曼测试可分析水合物气体组成、推测结构类型,再利用经验公式或者相对定量法可计算出其大/小笼的气体占有率和水合数;利用原位拉曼技术可以观测水合物形成和分解的微观过程,解析气体分子进入和离开笼子的进程、进行水合物形成和分解过程中气体浓度变化及水合物形成过程中气体溶解度的测定 ...
卢海龙 +4 more
core
[Determination of six whitening ingredients in cosmetics by ultra performance liquid chromatography coupled with photodiode array detector and corona charged aerosol detector]. [PDF]
Se PuLi X +8 more
europepmc +1 more source
[Case-based teaching with both positive and negative examples in undergraduate analytical chemistry laboratory： determination of six nitrogen-containing pesticides in environmental samples by solid-phase microextraction-high performance liquid chromatography]. [PDF]
Se PuZhang J +4 more
europepmc +1 more source
高效液相色谱与质谱联用分析测定川芎中有效成分阿魏酸与藁本内酯
, 2004 采用HPLC-MS系统地研究了中药川芎有效成分阿魏酸(ferykuc acid)和藁本内酯(liguatilide)的定量分析方法。利用制备色谱制备了藁本内酯对照品，并对其进行了紫外光谱、质谱、红外光谱等结构鉴定。分别考察了水、甲醇、乙醇、95％乙醇4种溶剂以及提取时间对川芎中阿魏酸和藁本内酯提取量的影响。结果表明：水是阿魏酸的最佳提取溶剂，提取时间45min为宜；乙醇是适合提取藁本内酯的溶剂，提取时间75min为宜。以外标法对市售川芎中的阿魏酸与藁本内酯进行了定量分析，二者含量分别是0．15％(m／m)
于志远 +5 more
core
[Optimized decomposition of dynamic electroencephalography-functional near infrared spectroscopy brain functional networks for the analysis of repetitive transcranial magnetic stimulation combined with motor training]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiLu J +6 more
europepmc +1 more source
[Determination of 16 organic ultraviolet absorbers in drinking water by solid phase extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuWang Z, Zhao C, Ye BX, Chen YY.
europepmc +1 more source