Abstract:

In order to solve the problem of the waste of flavones compounds in apocynum venetum bast fiber in conventional chemical degumming process, flavones from apocynum venetum bast fiber before degumming were extracted with supercritical carbon dioxide. The influence of cosolvent content, temperature, pressure and time on the extraction of flavones was investigated. Then the extracted solution was subjected to high performance liquid chromatographic analysis and antibacterial experiments. The results show that cosolvent mainly influences the polarity of supercritical fluid, and with the increase of solvent content, the polarity of the supercritical fluid increases the extraction rate. If the cosolvent content is too high, excessive water may cause the extraction pipeline blockate, which will decrease the extraction efficiency. Under the conditions of 45 °C and 20 MPa, the extraction rate of flavonoids is higher. Both of the increase and decrease of pressure and temperature will influence the extraction dfficiency of flavonoids. With the increase of the flow rate of supercritical carbon dioxide, the extraction rate of flavonoids increased gradually, but the requirement for equipment is high. Moreover, flavones compounds in apocynum venetum bast fiber have good antibacterial effect, which endues apocynum venetum bast fiber with good antibacterial performance.

Key words: apocynum venetum bast fiber, supercritical carbon dioxide, flavone, antibacterial