艾纳香挥发油化学成分的气相色谱 -质谱分析

由黔产艾纳香（Blumea balsamifera DC.)的叶提取挥发油,分出结晶后的母液,用气相色谱－质谱进行定性分析和峰面积相对含量的测定,鉴定出41个化学成分;主要成分为L－龙脑、樟脑、β-石竹烯、桉叶油醇、古芸烯、芳樟醇等。     

红橘油中脂肪酸组成的 GC-MS分析

用正己烷溶解达川和万县产的两种红橘油,将样品皂化和甲酯化后,以毛细管柱DB－WAX作为分离柱,用气相色谱－质谱法测定其中的脂肪酸组成,两种红橘油的主要脂肪酸成分有明显的差别,两者的不饱和脂肪酸相对含量分别为92．1％及76．7％。     

广东野菊花挥发油的化学成分

采用水蒸汽蒸馏法从野菊花中提取挥发油,试用不同类型的毛细管柱进行分析,找出了最佳分析条件,共分离出54个峰,用归一化法测定其相对含量,并用气相色谱-质谱法对化学成分进行鉴定,共鉴定18个成分,占挥发油总量的99.8%。     

差示扫描量热法测定食用油脂的热氧化稳定性及氧化寿命

利用差示扫描量热法（DSC）测定了四种食用花生油的热氧化稳定性,用Ozawa法和Kissinger法计算了四种食用花生油热氧化反应的动力学参数,推算了不同温度下的氧化寿命。     

毛细管气相色谱法测定深海鱼油中的EPA和DHA含量

用氢氧化钾－甲醇酯化法将深海鱼油中的脂肪酸快速、有效地转化成脂肪酸甲酯,然后进行毛细管气相色谱法测定,以二十二碳饱和脂肪酸甲酯为内标物,建立了5,8,11,14,17－二十碳五烯酸（EPA）和4,7,10,13,16,19－二十二碳六烯酸（DHA）的定量分析方法,并用于实际样品分析。该方法对EPA和DHA定量分析的相对标准偏差分别为4．6％和5．0％,回收率分别为99．7％和99．4％。     

现代分析检测技术在润滑油氧化中的应用

介绍了近20年来用于润滑油氧化测试中分析检测技术的进展情况,包括高效液相色谱、气相色谱、凝胶渗透色谱、热分析、红外光谱、核磁共振、化学发光及电化学技术,并讨论了今后发展的方向。     

艾叶挥发油的化学成分

采用水蒸气蒸馏法从艾叶中提取挥发油,试用不同类型的毛细管柱进行分析,找出最佳分析条件,共分离出59个蜂,用归一化法测定其相对含量,并用气相色谱－质谱法对化学成分进行鉴定,共鉴定了51个万分,占挥发油总成分的86％以上。     

GC/MS 法测定超临界 CO2 萃取茼蒿籽油

利用GC/MS分析了超临界CO2萃取茼蒿籽油的成分组成,共检出32种成分。茼蒿籽油主要由亚油酸（含量68.32%)、棕榈酸（10.80%)、油酸(6.39%)和长碳链脂肪酸组成;茼蒿籽油还含甾类（4.76%)和丰富的维生素E（3.9mg/g);研究了茼蒿籽油的理化特征。     

Comparative studies of oxidative stability of linseed oil

The oxidative stability of linseed oil was studied using classical method based on determination of peroxide value (PV), the Rancimat method based on conductometric measurements and thermoanalytical methods, i.e. the differential scanning calorimetry (DSC) and thermogravimetry (TG) in oxygen atmosphere.

The onset temperatures T_onset,DSC and T_onset,TG were determined from dynamical DSC and TG curves, respectively. From isothermal DSC curves times t_onset were determined.

The effect of two antioxidants was also studied. An antioxidant blend containing -tocopherol, ascorbyl palmitate, citric acid, ascorbic acid, and ethoxylated ethylene glycol proved more effective than butylated hydroxy anisole for protection of linseed oil against process, in good agreement with results obtained by the classical titration and the Rancimat methods.     

Composition and Antimicrobial Activity of the Essential Oil of Origanum × dolichosiphon P. H. Davis

The essential oil obtained by hydrodistillation from aerial parts ofOriganum × dolichosiphonP. H. Davis (Lamiaceae), a hybrid ofO. AmanumPost ×O. LaevigatumBoiss., was analyzed by GC/MS. Ninety-five compounds were characterized representing 92% of the oil. The major compounds were bicyclogermacrene (19.9%),-caryophyllene (13.0%), and germacrene D (10.8%). The antimicrobial activity of the oil was also determined