Continuous low-temperature spray drying approach for efficient production of high quality native rice starch

Abstract

Rice starch is an important functional ingredient for various food applications. As such, it is important that physicochemical functionalities of rice starch are not adversely affected during the starch extraction and drying process. This report looks at the development of a low-temperature spray drying process for production of native rice starch. Using waxy rice starch as the candidate, the reported spray drying strategy produced waxy rice starches with relatively high yield (74.13%), low moisture (13.92%) and uniform particle size. Physicochemical functionalities, including crystallinity and pasting properties, of the spray-dried waxy rice starch were preserved. Comparative studies highlighted that, unlike spray-dried rice starches, both oven- and freeze-dried waxy rice starches are associated with drawbacks including longer processing times, massive energy requirement, heterogeneous size distribution, modified pasting properties and higher moisture content. These studies path the way for application of the developed spray drying-based process for the production of native rice starches.

Keywords:

• Waxy rice starch
• spray drying
• low temperature
• physicochemical properties
• pasting behavior

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

Additional information

Funding

This work was supported by Science and Engineering Research Count, Pharos Advanced Surfaces Program [grant number 1523700106].