氧化石墨烯的制备及其催化水解大豆异黄酮

The Preparation of Graphene Oxide and Using It as Catalyst for the Hydrolyzation of Soybean Isoflavone

采用改良的Hummers法制备了负载有-SO3H、-COOH和-OH的氧化石墨烯,对其进行了结构表征。并首次以氧化石墨烯为催化剂,对天然产物大豆异黄酮糖苷水解反应进行了研究。实验结果显示氧化石墨烯在异黄酮糖苷水解反应中具有较好的催化活性,其最佳反应温度为105℃,此时3种大豆异黄酮糖苷的转化率分别达到94.3%,92.1%和88.8%,苷元的收率分别达到69.6%、60.6%和58.8%。其催化活性明显优于其他固体酸催化剂,如沸石HZSM-5和大孔树脂NKA-9,而与0.02 mol.L.1的硫酸相当。

Graphite oxide is a layered material consisting of hydrophilic oxygenated graphene bearing oxygen functional groups on their basal planes and edges.In this paper,the graphene oxide bearing with-SO3H,-COOH and-OH was prepared by the modified Hummers method and characterized,and which was used as a catalyst for the first time for the hydrolyzation of soybean isoflavone glycosides.Experimental results show that the graphene oxide has good catalytic activity for the hydrolyzation reactions.The optimal reaction temperature of the catalytic reaction is 105 ℃,at which the conversions of three kinds of isoflavone glycosides are 94.3%,92.1%,and 88.8%,and the yields of the corresponding aglycones are 69.6%,60.6%,and 58.8%,respectively.Comparing with other commercial solid acid catalysts,such as zeolite HZSM-5 and macroporous resin NKA-9,the catalytic activity of the prepared graphene oxide is remarkably higher,which is similar to that of 0.02 mol·L·^-1 sulfuric acid.