金莲花挥发油成分分析及其在单料烟加香中的应用

分别采用水蒸气蒸馏、同时蒸馏萃取、超声、闪式、先超声后同时蒸馏萃取,先闪式后同时蒸馏萃取6种提取方法提取金莲花挥发油,运用GC-MS分析挥发油的成分,并进行单料烟加香试验。结果表明：①金莲花挥发油得率分别为0.20%、0.67%、2.31%、2.67%、0.82%、0.78%,分别鉴定出20、30、19、18、37、30种成分;其中β紫罗兰酮、二氢猕猴桃内酯等为主要的香气成分;超声和闪式提取方法虽然挥发油得率高,但是杂质也较多,先超声后同时蒸馏萃取的挥发油优于其他几种。②在烟丝中,添加适量金莲花挥发油,能提高卷烟烟气的香气质和香气量,降低刺激性,改善余味,先超声后同时蒸馏萃取的挥发油加香效果最好。     

金莲花浸膏挥发性成分分析及其卷烟应用

采用GC-MS法分析了金莲花浸膏的挥发性成分,并进行了卷烟加香实验。结果表明:①金莲花浸膏中共鉴定出38种挥发性成分,主要有月桂酸(9.70%)、十四酸(9.52%)、十六酸乙酯(7.85%)、二十三烷(7.76%)、二氢猕猴桃内酯(7.72%)、亚麻酸乙酯(6.56%)、棕榈酸(5.85%)、十四酸乙酯(5.63%)、芳樟醇(2.31%)、β-紫罗兰酮(1.79%)、植酮(1.74%)、脱氢芳樟醇(1.68%)、顺茉莉酮(1.00%)等,这些物质是构成卷烟香味的重要物质;②金莲花浸膏具有改善和修饰卷烟吸味、丰满烟气、减轻刺激性的作用。     

气相色谱-质谱联用法测定漆膜中邻苯二甲酸酯类化合物

建立了漆膜中邻苯二甲酸酯类化合物的气相色谱-质谱（GC-MS）测定方法。以二氯甲烷为萃取溶剂,用溶剂萃取器萃取漆膜中的邻苯二甲酸酯类化合物,采用气相色谱-质谱联用仪（GC-MS）进行检测。邻苯二甲酸酯的线性相关系数r〉0.999,对实际加标样品的回收率在85%～115%之间,相对标准偏差（RSD）0.8%～6.6%,适合于漆膜中邻苯二甲酸酯类化合物的测定。     

Thermal decomposition processes in aromatic amine-based polybenzoxazines investigated by TGA and GC-MS

Three different aromatic amine-based polybenzoxazines are subjected to thermal decomposition in a thermogravimetric analyzer. The degradation products, which are volatile compounds evaporating out of the furnace as gases, are trapped and analyzed further by a gas chromatograph which is coupled with a mass selective detector (GC-MS). All the degradation products are separated by GC and come out at different retention times, as seen in the total ion chromatogram. All the compound's mass are selectively identified by MS. The chromatograms are divided into two regions; the low column temperature region containing low molecular weight and highly volatile compounds, and the high column temperature region containing higher molecular weight and less volatile compounds. The evolved gas analysis performed by GC-MS allows us to identify the molecular weight and also the structure of the volatiles. This information is then used to illustrate the processes occurring during the thermal decomposition of aromatic amine-based polybenzoxazines.     

Semiochemicals and Social Signaling in the Wild European Rabbit in Australia: I. Scent Profiles of Chin Gland Secretion from the Field

The European rabbit (Oryctolagus cuniculus) uses the secretion of the chin gland in the maintenance of social status. Previous work has concentrated on secretion collected directly from the animal. In this study, the analysis was conducted by collecting scent marks made by free-ranging animals. Scent marks were found to be concentrated at the center of the area controlled by a social group, and at the boundaries between two adjacent social groups. Only the mark from dominant animals could be identified. Marks were also collected from the skin of rabbits, where they had been placed by the dominant individual. The mark found on the head of a subordinate animal may, in the future, be used to identify the dominant animal of the social group, who placed the mark.     

Characterization of sterols in refined borage oil by GC-MS

Borage oil sterols were isolated by TLC and characterized using GC and GC-MS. Several diunsaturated Δ⁵-sterols, some of them not previously recorded in vegetable oils, were found. Of these, 24-methylcholesta-5,23-dienol and 24-ethylcholesta-5,23-dienol could be useful markers for borage oil. Two other diunsaturated Δ⁵-sterols that are rarely found in vegetable oils, 24-methylcholesta-5,24(25)-dienol and 24-ethylcholesta-5,24(25)-dienol, were identified. The diunsaturated C-24(28)-sterol, isofucosterol, was also found, as well as the monounsaturated Δ⁵-sterols campesterol and sitosterol. These are normally present in vegetable oils, which makes them unsuitable as markers for borage oil.     

工业石蜡的结构分析

采用核磁共振（NMR），红外吸收光谱（IR）和色－质联用（GC－MS）方法，测定了弓弩用工业石蜡的^13C-NMR谱、反转门控^13C-NMR谱、IR光谱、气相色谱和各组分的质谱，确定了该石蜡9种主要组分及其相对含量。     

怒江漆油中高级脂肪酸成分

对云南怒江漆油 (漆树籽油 )进行皂化得到了漆油的总脂肪酸 ,将总脂肪酸甲酯化得到总脂肪酸甲酯 ,用GC MS联用仪测定了所含高级脂肪酸的成分 ,结果表明云南怒江漆树油中高级脂肪酸分别为棕榈酸、油酸、硬脂酸、花生酸、二十烷二酸。其中 ,棕榈酸的质量分数高达 76.9%。     

新疆玫瑰精油化学成分的研究

研究了新疆玫瑰精油的化学成分 ,采用毛细管气相色谱 (GC)和色 -质联用 (GC -MS)方法 ,定量、定性检出了新疆玫瑰精油中的 2 7种成分。其中香茅醇及trans 香叶醇的质量分数达到 42 2 %。同时测定了法国玫瑰精油中的 2 4种成分 ,并对两者进行了对照 ,讨论了异同     

ASE-SAFE和SDE-GC-MS分析贾永信腊牛肉的挥发性香气成分

采用加速溶剂萃取-溶剂辅助蒸发法和同时蒸馏萃取法提取贾永信腊牛肉的挥发性香气成分,结合气相色谱-质谱联用技术对其进行了分析研究。结果表明,共鉴定出82种挥发性香气成分,包括烃类6种、醛类20种、醇类10种、酮类11种、酚类4种、脂肪酸类16种、醚类3种、酯类1种、含硫含氮及杂环化合物11种。两种方法同时检测到的化合物有16种,包括己醛、庚醛、苯甲醛、壬醛、2-糠醇、芳樟醇、α-松油醇、(-)-4-松油烯醇、1-羟基-2-丙酮、乙偶姻、2,3-戊二酮、胡椒酮、丁香酚、桉叶油素、茴香脑和2-甲基四氢呋喃-3-酮。