南瓜子油的气相色谱-质谱分析

黑龙江产白皮南瓜子油脂含量约为27％，从提取的南瓜子油中检测出大量的共轭亚油酸、磷脂、角鲨烯、环烷烃、共轭不饱和醛酮、植物甾醇等化学成分，其中植物甾酵的含量约占南瓜子油的1％，能确定结构的甾醇有6种。     

紫玉兰叶油化学成分的气相色谱/质谱法分析

采用常规水蒸汽蒸馏法提取出紫玉兰叶油,经气相色谱－质谱联机分析,分离出４０多个峰,鉴定出３２种化合物,主要是大根香叶烯、檀紫三烯,石竹烯３,７二甲基－１,３,７－辛三烯、莰烯等,占总峰面积的９５％。     

气相色谱-质谱法测定蒜头果油中的脂肪酸

 对云南产蒜头果油用硫酸 甲醇法酯化 ,以气相色谱 质谱 计算机联用仪进行了分析。共分离出 17种成分 ,鉴定了其中的 7种成分 ,分别为棕榈酸 (质量分数 (下同 ) 1.5 0 % )、油酸 (2 1.5 4% )、二十碳烯 11 酸 (7.0 4% )、芥酸(18.2 9% )、二十二烷酸 (1.33% )、二十四碳烯 15 酸 (4 0 .92 % )、二十四烷酸 (2 .14% ) ,占总质量的 92 .76 % ;未被鉴定的成分占总质量的 7.2 4%。     

葡萄籽油中脂肪酸组成的气相色谱分析

本文用快速酯交换法代替常规的脂肪酸甲酯的制备方法,对葡萄籽油进行酯化,并利用计算机自编程序,对色谱分离条件进行了最佳选择,从而使葡萄籽油中脂肪酸得到满意的分离和测定。     

气相色谱-质谱联用技术测定水中油

本文综述了近年来用气相色谱法测定水中油的技术进展。引用文献13篇。     

山苍子核仁油的大口径毛细管柱气相色谱—傅里叶变换红外光谱分析

本文采用国产色谱仪与进口红外光谱仪及接口加工组成气相色谱－傅里叶变换红外光谱分析仪，使用大口径弹性石英毛细管柱，分析了湖南省永顺县产山苍子核仁油的组成，讨论了利用等高线图分析技术及差谱技术处理ＧＣ－ＦＴＩＲ分析数据的方法，得出了其中约８０多个组分的纯化合物气相红外光谱图，定性了其中３８种物质，占总色谱峰面积的９０％以上。     

气相色谱近年的发展

简要阐述了近几年气相色谱(GC)的发展和特点。GC是一个成熟的技术,广泛地应用于各个领域,近几年GC的发展除了继续研究新的固定相和高性能的毛细管色谱柱之外,主要在全二维气相色谱(GC×GC)、快速GC、便携式GC仪和微型GC仪几个方面。近几年新研究的GC固定相主要集中在常温离子液体和各种环糊精的衍生物。现在GC研究者趋向于使用商品化的GC毛细管柱,而商品化的GC毛细管柱应用最多的是以含5%苯基的聚甲基硅氧烷为固定相的色谱柱。GC×GC发展迅猛,特别是关于调制器的研究,已开发出十多种调制模式,并广泛地应用于各个领域。为了适应大量样品的分析和现场分析,研究和开发了多种快速GC方法和仪器以及便携式GC仪。为了仪器的小型化和专属性检测,μGC仪的研究也稳步地发展起来。     

气相色谱—四温裂解气相色谱联用分析

本文利用气相色谱—四温裂解气相色谱联用仪对一些混合物作定性分析,此方法可用来作气相色谱难分离物质的鉴定。     

气相色谱－质谱法测定各种柑桔籽油中脂肪酸的含量

Five fatty acids in orange oils were separated and identified with GC/MS and 9. 12-Octadecadiexioic acidin the oils was quantitated with HPLC.     

用气相色谱仪测定变压器油中气体

本文采用多柱自动切换气相色谱仪和真空全脱气装置对变压器和互感器用油中的气体进行了系统的分析，除可测定油中的氢、甲烷、乙炔、乙烯、乙烷、二氧化碳和一氧化碳等气体外，还可根据不同需要测定氮、氧以及Ｃ３和Ｃ４烃的含量。本方法已用于诊断变压器和互感器内部变化及故障。     

Gas chromatography of some prostaglandins

Summary The synthetic prostaglandin F_2α (PG_2α), used as an ovulation regulator, and abortion inducer, is contaminated with its Δ5-trans isomer. The ratio of the isomers was measured by capillary GC. The prostaglandin I₂ (PGI₂), a blood platelet aggregation inhibitor, easily decomposes to 6-ketoprostaglandin F_1α (6-keto PG_1α). Their ratio was measured by packed column GC. An unexpected, instantaneous methanol cleavage was observed during the GC analysis of the methyl ketal derivative of 6-keto PG_1α, forming a mixture of PGI₂ and Δ6-prostaglandin I₁ (Δ6-PGI₁). Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984     

南方马尾松松针挥发油成分的气相色谱/质谱分析

采用水蒸了蒸馏方法从中国南方新鲜马尾松松针中提取出挥发油,利用气相色谱／质谱（ＧＣ／ＭＳ）联用技术对其化学成分进行了分析,共分离出９１个峰,各组分经数据库标准图谱核对,得到分子结构。其中３６种化合物的含量较高,占总离子流的８３．０５％,主要是单萜和倍半萜,以及少量萜烯的醇、酯类化合物。     

鱼油中二十碳五烯酸和二十二碳六烯酸的气相色谱—红外光谱分析

本文利用气相色谱－红外光谱联用仪对鱼油中的ＥＰＡ和ＤＨＡ进行了定性，定量的分析研究，建立了ＥＰＡ－Ｅ和ＤＨＡ－Ｅ的蒸气相红外标准谱图和气相色谱保留时间数据库，提供了一种在无法找到标准物质的情况下鱼油中ＥＰＡ和ＤＨＡ进行定性，定量分析的简便准硼确的方法。     

航空润滑油热氧化衰变的高压差示扫描量热法分析

模拟实际使用条件，对ВНИИНП－50－1－4Φ航空润滑油进行热氧化试验，应用高压差示扫描量热法（PDSC）和气相色谱仪（GC）评价抗氧剂N－苯基－α萘胺（NPAN）的热氧化衰变程度；结果发现在50－1－4Φ润滑油热氧化衰变过程中，抗氧剂NPAN质量分数（w）的对数值与PDSC在一定条件下测得的氧化诱导期torr具有良好的线性相关性，表明PDSC是研究润滑油热氧化衰变程度的理想手段。     

深海鱼油中脂肪酸的分析

用氢氧化四甲胺／甲醇酯化法使深海鱼油内的三酸甘油酯中的脂肪酸和游离脂肪酸转化成脂肪酸甲酯,用气相色谱和气相色谱／质谱进行分析,鉴定出４１个组分,并对其中的主要组分顺式－５,８,１１,１４,１７－十二碳五稀酸（ＥＰＡ）和顺式－４,７,１０,１３,１６,１９－二十二碳六烯酸（ＤＨＡ）建立了定量分析方法。方法的相对标准偏差分别为４．３％（ＥＰＡ）和４．７％（ＤＨＡ）。ＥＰＡ和ＤＨＡ的回收率分别为１００．     

Gas chromatography analysis of organophosphorous pesticides in plant samples

Summary The work presents a GC method for the determination of six organophosphorous pesticide residues in cabbage. Chopped cabbage was blended with acetone, then extracted with the mixture of n-hexane:methylene chloride (1:1). The extract was purified on a GPC column packed with BioBeads SX-3 gel. The pesticides were eluted with the mixture of methylene chloride:cyclohexane (1:1) at the flow rate of 0.5 mL min⁻¹. After concentrating the extract was analysed by GC. Nearly 100 samples of cabbage were analysed; trace residues of dimethoate (about 0.05 ppm) were found in 10 samples. The average recoveries of the pesticides were above 80% with a relative standard deviation mostly less than 10%. Presented at: Balaton Symposium on High-Performance Separation Methods, Siófok, Hungary, September 3–5, 1997.     

Gas chromatography on 10 um silica particles

Summary Porous silica microparticles designed for modern liquid chromatography have proven effective in gas chromatography. Columns of 35–50 cm gave plate heights as low as 3.3 particle diameters and speeds of 2400 theoretical plates per second or 500 effective theoretical plates per second. Inlet pressures up to 70 atmospheres were required using hydrogen as carrier gas. The particles as received were too retentive for fast chromatography and gave asymmetric peaks. A coating of fluorosilicone oil overcame both problems. Other coatings were less effective. Bonded phases proved less satisfactory on both counts and also gave substantially less efficient columns and greater flow resistance. Column efficiency and flow resistance were sharply dependent on physical properties of the particles. The most efficient packing was clearly spherical particles of 5–10 μm diameter with narrow size distribution, pore diamters about 50 nm, BET surface areas of 25–50 m²/g and surfaces modified with trifluoropropyl silicone. A six-component hydrocarbon sample was separated in 33 s with a resolution of 4 for the most difficult pair and in 2.6 s with a minimal resolution. Performance was limited by end effects and by available pressure so that much better performance can be expected from longer columns and higher pressures.     

Automotive Gasoline Quality Analysis by Gas Chromatography: Study of Adulteration

Summary The addition of organic solvents (light aliphatic, heavy aliphatic and aromatic hydrocarbons) in Brazilian gasoline is unfortunately very frequent, and this illicit practice impares gasoline quality. Gas chromatography (GC) and gas chromatography coupled to mass spectrometry (GC-MS) analyses can be used as a procedure to improve the detection of adulterated gasoline. The results showed that adulterated samples and also the type of organic solvent used in adulteration can be detected by comparison of chromatographic profiles (standard samples versus adulterated samples). However, a single GC analysis can detect an adulterated gasoline, and so decrease the number of adulterated samples approved as presenting good quality.     

Gas chromatography of hydrocarbons using packed liquid chromatographic capillary columns

Capillary columns of 0.3-0.5 mm i.d. packed with 3- to 30-μm silica-based stationary phases for liquid chromatography were used for gas chromatographic separation of hydrocarbons. Column efficiencies were evaluated for various commercially available packing material. The best column efficiency was achieved with 5-μm octadecyl group bonded silica gel, the surface of which was coated with a poly (dimethylsiloxane) film. The 30-cm column produced 11,000 theoretical plates.