超临界二氧化碳提取桂花浸膏的研究

盐矾水贮存的桂花经水洗脱盐、离心脱水后,以超临界二氧化碳提取。实验结果表明,在压力为8—12MPa,温度为35—40℃的条件下进行萃取和在等温条件下分离且分离压力小于2.5MPa时得到的+桂花浸膏,同用石油醚浸取得到的浸膏相比,桂花的特征香气完全,天然感、新鲜感好。色一质谱联用分析表明:由超临界二氧化碳萃取和石油醚浸取这两种方法得到的桂花浸膏主要成分是相同的,皆为β-紫罗兰酮和二氢-β-紫罗兰酮,但两者在含量上相差悬殊,总含量前者几乎是后者的一倍。

Osmanthus fragrans preserved in the mixture of water, salt and alum were extracted by supercritical carbon dioxide(SCFE—CO_2)after they had been washed by water. The experiment showed that under these conditions, of which the extraction pressure was 8 to 12 MPa and the temperature was 35 to 40℃, while the separation was conducted by redticing pressure to less than 2.5 MPa isotherlnally, the concrete extracted by SCFE- CO_2 was superior to that prepared by light petroleum other. The concrete extraeted by SCFE—CO_2 was complete in the characteristic sweet Smell of the flowers and had a strong scent in natrure and fresh. Two kinds of concrete were analyzed by GC-MS. The results showed that the main components of two kinds of essential oil were the same, which were β-ionoe and dihydro-β-ionone, but they had quite difference in quantity. The totrl content of the main components from. the SCFE—CO_2 extract was nearlv two times as large as the one from the light petroleum ether extract.