Table of Contents
Journal of Food Processing
Volume 2014, Article ID 904125, 5 pages
http://dx.doi.org/10.1155/2014/904125
Research Article

Application of Hydrothermally Modified Sweet Potato Starch as a Substitute Additive for Soup Mixture

1Department of Food Science and Technology, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka
2Department of Agriculture, University of Sabaragamuwa, Belihuloya, Sri Lanka

Received 17 June 2014; Revised 9 August 2014; Accepted 14 August 2014; Published 25 August 2014

Academic Editor: Harshadrai M. Rawel

Copyright © 2014 S. A. Senanayake et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Potential application of modified sweet potato starch as a substitute thickener for corn starch was studied, by using native starches extracted from five different cultivars of sweet potatoes commonly available in Sri Lanka. Physicochemical properties (swelling power, water solubility index, pasting, and gelatinization) and digestibility of native and modified (heat-moisture treated, 20% moisture, 85°C for 6 hrs) starches were analysed. Modified Swp3 (Wariyapola white), Swp4 (Pallepola), and Swp5 (Malaysian) starches were selected based on the favourable conditions shown in the required physical and chemical properties and applied in a vegetable soup formula as a thickening aid. Corn starch added samples were kept as controls and the viscosity difference and sensory attributes were tested. Viscosity of the reconstituted soup powder and sensory analysis showed that Swp4 and Swp5 had significantly high level () of sensory quality and the average rank for mouth feel (taste), texture and overall acceptability was significantly high () in Swp5 added samples. Shelf life studies ensured 6 months of stability with negligible level of moisture increase and total plate count in air tight polypropylene packages at ambient temperatures (28–31°C). Results of this study revealed a possibility of applying physically modified Swp4 and Swp5 starches as a substituent food ingredient for commercially available corn starch to improve the thickness of food products.