NDLI: Effect of Water Content in Potato Amylopectin Starch on Microwave Foaming Process

Content Provider	Springer Nature Link
Author	Sjöqvist, Mia Gatenholm, Paul
Copyright Year	2006
Abstract	In this study we investigated the role of the water content of extrudates had in foaming capacity and searched for the water content giving the greatest expansion of starch extrudates. Porous structures based on potato amylopectin starch were prepared by extrusion followed by a microwave foaming process. Starch was first extruded with water, in order to incorporate water in the granular structure and achieve gelatinization. Extrudates were conditioned at humidities ranging from 11% to 97%. The water content in the starch extrudates was studied by a water vapor sorption isotherm study. Extrudates were analyzed with light microscopy and wide angle X-ray scattering studies to determine degree of crystallinity. In the second step, extrudates were foamed in a microwave oven. As the water started to boil, it acted as a blowing agent, leaving a porous closed-cell starch structure. The densities and the expansion ratios of the foamed samples are determined. Porosity was studied with environmental scanning electron microscopy. Mechanical properties as a function of the surrounding humidity were analyzed with dynamic mechanical analysis. We found that the maximal degree of expansion was in extrudates conditioned at 33% and 54% RH and having water content of 11.2% and 13.4%, respectively. This level of water is sufficient to expand the extrudate to a maximum level but not high enough to plasticize the starch and cause cell collapse after treatment.
Starting Page	43
Ending Page	50
Page Count	8
File Format	PDF
ISSN	15662543
Journal	Journal of Polymers and the Environment
Volume Number	15
Issue Number	1
e-ISSN	15728900
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-12-27
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Starch Amylopectin Extrusion Foaming Microwave treatment Moisture content Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Environmental Engineering Polymers and Plastics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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