Dextrin nanoparticles as a biodegradable biopolymers were converted to magnetic nanoparticles (Fe₃O₄@nano-dextrin) then based on the resulted core-shell structure as a support for lewis acid (Ti(IV)) was used. Thus, the Fe₃O₄@nano-dextrin/Ti(IV) catalyst with a very easy and complete recovering ability was synthesized. The synthesized catalyst was characterized by different techniques such as FT-IR, FESEM, TEM, ICP, VSM, XRF as well as TGA. Just as initial reporting, the efficiency of the above-mentioned catalyst was investigated in the synthesis of 1,3-naphthoxazines in good yields under benign reaction conditions. This new bio-catalyzed procedure could be helpful in economic and biocompatibility aspects in multi component reactions.

将糊精纳米颗粒作为可生物降解的生物聚合物转化为磁性纳米颗粒（Fe ₃ O ₄纳米糊精），然后基于所得的核-壳结构作为路易斯酸（Ti（IV））的载体。因此，Fe ₃ O ₄合成了具有非常容易和完全回收能力的纳米糊精/ Ti（IV）催化剂。通过FT-IR，FESEM，TEM，ICP，VSM，XRF以及TGA等不同技术对合成的催化剂进行了表征。正如最初报道的那样，在良性反应条件下以高收率合成1,3-萘并恶嗪时，研究了上述催化剂的效率。这种新的生物催化方法可能有助于多组分反应的经济性和生物相容性方面。