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[摘要]
采用水蒸气蒸馏法提取信阳毛尖挥发油。用热失重(TG)技术以及在线热裂解(Py)技术对信阳毛尖挥发油热裂解产物进行了研究。TG曲线显示主要失重区间在25~443.4 ℃,质量损失高达93%,选取了失重比较大的2个温度点(200、500 ℃)和800 ℃作为裂解温度,以气相测谱/质谱法(GC/MS)分析其在不同温度下的裂解产物。结果表明,信阳毛尖挥发油经GC/MS测定共鉴定出45种化学成分,主要是醇、酮、萜烯类物质;裂解实验中,挥发油在200 ℃热裂解后共分离鉴定出31种化合物,500 ℃热裂解后共鉴定出30种化合物,并出现稠环芳烃类物质。800 ℃热裂解后共分离鉴定出45种化合物,且稠环芳烃类物质的含量随温度的升高而增加。
[Key word]
[Abstract]
The essential oil of Xinyang Maojian tea was extracted with steam distillation extraction. The pyrolyzed products of the Xinyang Maojian tea extract was investigated by thermogravimetric analysis and on-line pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The TG curve shows that between 25~443.4 ℃ the largest weight loss occurs, and the total weight loss was about 93%. Py-GC/MS was used for the qualitative and semi-quantitative analysis of the pyrolysis products at the main weight loss temperature(200, 500 and 800 ℃).The results showed that 45 volatile compositions were identified from Xinyang Maojian tea by GC/MS. Alcohols, ketones and terpenes were the main efficacious ingredients in the essential oil. Pyrolysis products of the essential oil at 200 ,500 and 800 ℃ were compared. 31 compounds were identified at 200 ℃ and 30 compounds were identified at 500 ℃. Polycyclic aromatic hydrocarbons occurred when hydrolysis at temperature higher than 500 ℃ and 45 compounds were identified at 800 ℃. Its quantity increased with the rise of temperature.
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