采用饱和水溶液法制备了大豆苷元分别与两种氨基修饰β-环糊精(ACD)即单-6-氨基-β-环糊精(NCD)和单-6-乙二胺基-β-环糊精(ENCD)的固体包合物,并获得最佳包合条件:大豆苷元与环糊精投料比为3:1(n/n),搅拌时间为72 h,分别获得83%和67%的产率。利用X-射线粉末衍射和热重分析对其进行了表征,证实了两种包合物的形成。利用Job's曲线法确定了主客体的包合比为1:1,并利用荧光光谱滴定分析测得其包合稳定常数KS分别为899.2和203.8 L/mol。水溶性实验表明,通过与NCD和ENCD形成包合物,25℃下大豆苷元在水中的溶解度由原来的8.31μg/mL增至15.2和13.2 mg/mL,分别提高了约1800和1500倍。
To improve the wat er s olubi l i ty o f dai dzei n , s o l id in c lu s io n c om p le x e s o f d a id z e in w i th tw o am in o - modified β -cyclodextrins ( ACDs ) , i . e . , mo n o - 6 - amin o - 6 - d e o x y - S- c y c lo d e x t r in ( NC D ) a n d m o n o - 6 - ethylenediamino - 6 - deoxy - S-cyclodext rin (ENCD ) , we r e p r e p a r e d b y th e s a tu r a t e d s o lu t io n m e th o d i n w a t e r under the preparation conditions as f ol lows: the r a t io o f d a i d z e i n /ACD w a s 3颐1 a n d th e s t i r r in g t im e w a s 72 h (83% and 67% yields , respectively ). The fo rma t io n o f tw o in c lu s io n c o m p le x e s w a s c o n f i rm e d b y x - r a y diffractometry (XRD ) and themogravimet r ic (TG ) a n a l y s i s. T h e in c lu s io n s to ic h iom e t r y o f th e in c lu s io n complexes was 1:1 from the Job plot and t he i r c omp l e x a t io n s t a b i l i ty c o n s t a n t s ( Ks ) w e r e 899. 2 a n d 203.8 L/mol from fluorescence ti t rat i on , r es pect ively . Af te r fo rma t io n o f in c lu s io n c o m p l e x e s w i th N C D a n d ENCD , the water solubility of daidzein wa s dr ama t i c a l ly r a i s e d f rom 8.31 μ g /mL to 15. 2 a n d 13. 2 m g /m L at 25℃,increasing by 1800- fold and 1500-f old .