气质联机法测定崂山绿茶中香气成分(I)

Determination of Aroma in Laoshan Green Tea by GC/MS(I)

介绍了青岛崂山绿茶中香气成分的分析方法。用常压水蒸气蒸馏法提取崂山绿茶中的香气成分。冷凝液用乙醚萃取。萃取液经脱水,在室温25℃1个标准大气压下使乙醚挥发,保留体积为1.5 mL。用气相色谱-质谱联机法(GC MS,Saturn 2000)对其中的香气成分进行了定性分析。被检出的天然香气物质有44种,与NIST谱图库(美国标准与技术研究院NIST数据库)的匹配效果较好,尤其是12种具有代表性的成分。试验结果表明,崂山绿茶中香气物质种类较丰富。

The analytical method of aroma in Laoshan green tea is introduced. Aromatic materials were distilled from Laoshan green tea by a method of water-vapor distillation. The materials in cool distilled liquid were extracted by ether. After dehydration of Na2SO4 and ether＇s controlling volatilization at 1 atm pressure and 25℃ room temperature, only 1.5 mL organic liquid was left. The liquid was analyzed by GC/ MS. 44 varieties of aroma components were identified and matched well with NIST spectrum library,especially for the 12 of them as shown in table 1. It has been proved that Laoshan green tea is rich in aroma.