Advanced technology for nanostarches preparation by high speed jet and its mechanism analysis

Xia, Wen and He, Dongning and Fu, Yun-fei and Wei, Xiao-yi and Liu, Hong-chao and Ye, Jiang-ping and Liu, Yun-fei and Li, Ji-hua (2017) Advanced technology for nanostarches preparation by high speed jet and its mechanism analysis. Carbohydrate Polymers, 176. pp. 127-134. ISSN 0144-8617

Abstract

Nanostarches were successfully prepared by high speed jet (HSJ) after pretreatment of micronization. The nanostarches were obtained at the conditions of micronization treatment for 60 min, and then one cycle at 240 MPa of HSJ (188.1 nm). Moreover, after HSJ treated for three cycles, the particle size could reach the level of nanometer materials (66.94 nm). The physicochemical properties of nanostarches had been characterized. Rapid Visco-Analysis (RVA) showed that the viscosity of nanostarches significantly decreased compared with native tapioca starch and slightly decreased with increasing processing cycles of HSJ. Steady shear analysis indicated that all samples displayed pseudoplastic, shear-thinning behavior, while the flow curves of nanostarches were little impact by the processing cycles of HSJ. X-ray diffraction analysis showed that the complete destruction of tapioca starch crystalline structure was obtained after HSJ treatment. Molecular characteristics determination suggested that the degradation of amylopectin chains occurred after the treatment of micronization and HSJ, which was proved by the decrease of weight-average molar mass. The results demonstrated that nanostarches were obtained due to the breakdown of starch molecules. This study will provide useful information of the nanostarches for its potential industrial application.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 11 Dec 2017 02:25
Last Modified: 18 Dec 2017 06:38
Uncontrolled Keywords: high speed jet; mechanism; microstructure; molecular characteristics
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
Identification Number or DOI: 10.1016/j.carbpol.2017.08.072
URI: http://eprints.usq.edu.au/id/eprint/33087

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