Journal
POLYMERS
Volume 11, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/polym11010008
Keywords
atmospheric pressure plasma jet; maize starch; modification; structure; property
Categories
Funding
- National Natural Science Foundation of China [21502177]
- Science and Technology Basic Research Program of Henan Province [182102110248, 182102310903]
- Basic Research Plan of Higher Education School Key Scientific Research Project of Henan Province [19zx012]
- Higher Education School Young Backbone Teacher Training Program of Henan Province
- Doctoral Research Foundation of Zhengzhou University of Light Industry [2014BSJJ032]
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In present study, a novel physical modification of waxy maize starch (WMS) and normal maize starch (NMS) was investigated by using an atmospheric pressure plasma jet (APPJ) treatment. The effect on the structure and physicochemical properties of both starches was demonstrated by treatment with a 5% starch suspension (w/w) with APPJ for short periods of time (1, 3, 5, or 7 min). The pH of WMS and NMS was decreased after APPJ treatment from 5.42 to 4.94, and 5.09 to 4.75, respectively. The water-binding capacity (WBC) (WMS: 105.19%-131.27%, NMS: 83.56%-95.61%) and swelling volume (SV) (WMS: 2.96 g/mL-3.33 g/mL, NMS: 2.75 g/mL-3.05 g/mL) of the starches were obviously increased by APPJ treatment. The surfaces of starch granules were wrecked, due to plasma etching. No changes in the crystalline types of both starches were observed. However, the relative crystallinities (RCs) of WMS and NMS were reduced from 46.7% to 42.0%, and 40.1% to 35.7%, respectively. Moreover, the short-range molecular orders of both starches were slightly reduced. In addition, APPJ treatment resulted in lower gelatinization temperature and enthalpies. Therefore, APPJ provides a mild and green approach to starch modification, showing great potential for applications in the food and non-food industry.
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