Changes in characteristics of sweet potato flour prepared by different drying techniques.

Ramesh Yadav, A. and Manisha, Guha and Tharanathan, R. N. and Ramteke, R. S. (2006) Changes in characteristics of sweet potato flour prepared by different drying techniques. LWT - Food Science and Technology, 29 (1). pp. 20-26. ISSN 0023-6438

PDF LWT_39_(2006)_20-26.pdf Restricted to Registered users only Download (469kB)

Abstract

The changes occurring in the characteristics of sweet potato flour as a result of processing were investigated. Pasting behaviour of drum dried and hot air-dried sweet potato flour was determined using Rapid Visco-Analyser. The pasting characteristics decreased due to gelatinization of starch during processing. The degradation of starch by amylases during hot air drying further lowered the water binding capacity/viscosity and total amylose and increased the digestibility compared to those of drum dried and native flour. Swelling power and solubility of the flours increased as a result of processing which subsequently increased with increase in temperature. Scanning electron micrographs of starch granules showed tendency of clustering, especially in drum dried samples. X-ray diffraction patterns showed alteration from Ca-type to V-type with a marked reduction in crystallinity index as a result of processing. The ¹³C NMR spectra of processed starches showed reduced peak intensities and line widths due to depolymerizing effects, and also pointing to their change in crystallinity.

Item Type:	Article
Additional Information:	Copyright of this article belongs to Elsevier Ltd.
Uncontrolled Keywords:	Sweet potato flour; Pasting behaviour; Hot air drying; Drum drying; Scanning electron microscope; X-ray diffraction; <sup>13</sup>C NMR
Subjects:	600 Technology > 08 Food technology > 23 Vegetables > 02 Potato 600 Technology > 08 Food technology > 05 Processing and Engineering
Divisions:	Fruit and Vegetable Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	07 Apr 2007
Last Modified:	28 Dec 2011 09:27
URI:	http://ir.cftri.res.in/id/eprint/557

Actions (login required)

View Item