气相色谱法测定2-乙基丁醛中7个杂质的含量

目的:建立气相色谱法(GC)测定2-乙基丁醛中乙醛、丁醛、巴豆醛、丁醇、2-乙基丁醇、2-乙基丁酸和三聚乙醛的含量。方法:采用100%二甲基聚硅氧烷为固定液的毛细管柱(DB-1,0.53 mm×30 m,3μm),起始温度为60℃,维持2 min,以5℃·min^(-1)的速率升温至120℃,维持15.5 min,进样口温度为200℃,氢火焰离子化检测器(FID)温度为260℃,载气为氮气,分流比为40∶1,进样体积1μL,外标法定量。结果:乙醛、丁醛、巴豆醛、丁醇、2-乙基丁醇、2-乙基丁酸、三聚乙醛的质量浓度分别在0.1001~0.3004 mg·mL^(-1)(r=0.9991)、0.2005~0.6015 mg·mL^(-1)(r=0.9994)、0.0255~0.0766 mg·mL^(-1)(r=0.9993)、0.1066~0.3017 mg·mL^(-1)(r=0.9993)、0.1002~0.3006 mg·mL^(-1)(r=0.9985)、0.2501~5.0016 mg·mL^(-1)(r=1.000)、0.0808~2.4233 mg·mL^(-1)(r=0.9993)范围内,峰面积与之呈良好线性关系;平均回收率分别为107.4%、106.9%、100.4%、109.1%、101.8%、103.8%、104.1%,RSD分别为1.1%、1.5%、1.2%、1.9%、1.6%、5.2%、0.50%;3批样品中乙醛、丁醛、巴豆醛、丁醇、2-乙基丁醇、2-乙基丁酸和三聚乙醛含量分别在0.02%~0.31%、0.57%~1.0%、0.01%~0.02%、0.24%~0.33%、未检出~0.25%、2.2%~3.9%、0.66%~1.9%范围内。结论:本试验建立的分析方法分离度好,结果准确,可有效分离并测定2-乙基丁醛中7个杂质的含量,为其质量控制提供保障。

毛穗香薷挥发油化学成份的分析

本文用气相色谱和毛细管色谱——质谱——计算机法,分离了毛穗香蕾挥发油组分109个,鉴定了41个成分。其主要成分有2—甲基—6—甲烯基—7—烯—手醇—2,2—乙基丁醛,β—石竹烯,扰牛儿醛,α—莰酮等。

Determination of the Critical Temperature and Critical Pressure of Five Compounds

The critical properties of five compounds, including propanal,butanal, 1-pentanal, 2-methel butanal and trimer of ethanal, weredetermined for the first time by a new capillary quick-flow method.The apparatus was improved with a capillary tube and checked withhexane and 10heptene as standard reagents. The experimental resultsproved that the determination of critical properties by quick-flowmethod with a capillary tube apparatus was successful.

Novel degradable polymer networks containing acetal components

A novel copolymer network with acetal structure was prepared using bis[4-(vinyloxy)butyl](4-methyl-1,3-phenylene)biscarbamate(BECT)as the crosslinking agent.Firstly,a tri-copolymer of maleic anhydride(MAn),n-butyl vinyl ether(BVE)and 4-hydroxybutyl vinyl ether(HBVE)was synthesized via free-radical polymerization with 2,2′-azobisisobutyronitrile as the initiator.The tri-copolymer consisted of two sorts of alternating units,MAn-alt-BVE and MAn-alt-HBVE.The linear copolymer Poly((MAn-alt-BVE)-co-(MAn-alt-HBVE))with pending hydroxyl groups was then combined with BECT in the presence of pyridinium p-toluenesulfonate,generating a copolymer network comprising acetal components in the crosslinking segment. This polymer network exhibited degradation in acid conditions.