V型直链淀粉-正辛醇复合物的制备及结晶结构的研究

以B型微晶淀粉为原料、正辛醇为配体,在Et OH/H2O体系中采用加热回流的方法制备得到了直链淀粉-正辛醇复合物。通过单因素实验,探讨了淀粉/辛醇的配比、乙醇浓度、结晶冷却条件、保温温度和保温时间对复合物形成的影响。运用X射线衍射对复合物的结晶结构进行对比分析,确定制备直链淀粉-正辛醇复合物的最佳工艺条件为淀粉/辛醇的配比10∶1,乙醇浓度为35%,保温温度80℃,保温时间60 min,结晶冷却速率是5℃/h。在此条件下,制得的复合物为V型结构,其结晶度可达到61.29%。 

Preparation of V- type amylose- n- octyl octanol complex and analysis of the crystal structure

V- type amylose- n- octyl octanol complex which B- type microcrystalline starch was made a combination with n- octyl octanol was prepared by means of heating reflux in the Et OH / H2 O system.Through single factor experiments,the effects of the starch / octanol ratio,the ethanol concentration,cooling crystallization conditions,insulation temperature and insulation time on the crystallinity of the V- type amylose- n- octyl octanol complex were investigated.Meanwhile,the X- ray diffraction was used to analyze the crystal structure of complex.The optimal technological condition was as follows: the starch / octanol ratio 10 ∶ 1,the ethanol concentration 35%,insulation temperature 80 ℃,insulation time 60 min and cooling crystallization conditions 5 ℃ / h.V- type amylose- n- octyl octanol complex was prepared under the condition,it was confirmed that the crystal structure of complex was V type,the crystallinity reached 61.29%.