A microwave-assisted extraction approach based on ionic liquids of different chain lengths was successfully applied to the extraction of ten flavonoid glycosides from the flowering heads of Chrysanthemum morifolium Ramat. The pretreated sample was quantified by HPLC-ESI-MSn. The main components were identified as flavonoid glycosides, including three luteolin glycosides, three apigenin glycosides, three kaempferide glycosides, and one acacetin glycoside according to the characteristics of the corresponding CID mass spectrometric patterns. Eight ionic liquids from the imidazolium family with different chain lengths, namely, 1-alkyl-3-methylimidazolium bromide, [Cnmim]Br, (n = 2–16) were studied as extraction medium in water. Results indicated that alkyl chain length had an irregular impact on the extraction efficiency. Moreover, the best extraction efficiency was achieved by 1-dodecyl-3-methylimidazolium bromide aqueous solution ([C12mim]Br). Besides the alkyl chain length of the cations, other factors influencing extraction efficiency were systematically investigated, including concentration of the IL solutions, extraction time, matrix-to-solvent ratio and irradiation power.
一种基于不同链长
离子液体的微波辅助提取方法成功应用于提取母菊(Chrysanthemum morifolium Ramat)的花头中的十种类
黄酮糖苷。预处理样品采用HPLC-ESI-MSn进行定量分析。主要成分被鉴定为类
黄酮糖苷,包括三种
黄酮糖苷、三种茴香糖苷、三种凯普芬糖苷,以及一种乙酰基糖苷,根据相应的CID质谱特征进行鉴定。研究了来自
咪唑鎓(imidazolium)家族的八种不同链长的
离子液体,即1-烷基-3-甲基
咪唑鎓
溴化物([Cnmim]Br,n = 2-16),作为
水相提取介质。结果表明,烷基链长对提取效率的影响不规律。此外,最佳提取效率是在1-
十二烷基-3-甲基
咪唑鎓
溴化物
水溶液中([C12mim]Br)获得的。除了阳离子的烷基链长外,系统研究了影响提取效率的其他因素,包括
离子液体溶液浓度、提取时间、基质到溶剂的比例和辐射功率。