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Study on structure of hydroxypropyl tapioca starch phosphate ester prepared by ultrasound

HU Ai-jun,LI Qian,ZHENG Jie,YANG Lin,QIN Zhi-ping(Key Laboratory of Nutrition and Safety of Ministry of Education,College of Food Engineering and Biotechnology,Tianjin University of Science & Technology,Tianjin 300457,China)  
Hydroxypropyl tapioca starch phosphate ester(HTPE)was prepared with hydroxypropyl tapioca starch by ultrasound processing,in which hydroxypropyl tapioca starch was esterified by disodium hydrogen phosphate(Na2HPO4)and sodium dihydrogen phosphate(NaH2PO4).The structure analysis was performed by means of SEM,FTIR and X–Ray diffraction,and the results showed that phosphate groups were linked with the arrhydrous glucose units of hydroxypropyl tapioca starch.The crystalline regions were also affected due to the destroying of hydrogen bond in starch molecules with ultrasound.
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