Moisture sorption isotherm and isosteric heat of sorption of edible films made from blends of starch amylose and methyl cellulose


Citation

Chowdhury T., . and Das M., . Moisture sorption isotherm and isosteric heat of sorption of edible films made from blends of starch amylose and methyl cellulose. pp. 1669-1678. ISSN 2231-7546

Abstract

Effect of incorporation of amylose and methylcellulose in glycerol-water as well as glycerol-polyethylene glycol-water plasticized starch films on their moisture sorption characteristic was determined at 25 35 and 45oC using isopiestic vapor transfer technique. Among the three models like GAB modified Oswin and Peleg for sorption modified Oswin was found to be the best describing the behavior. Within the temperature range studied methylcellulose reduced the moisture content of starch film for both the plasticizer systems. For amylose incorporation reduction in equilibrium moisture content occurred at all the temperatures for glycerol-water plasticizer whereas for glycerol-polyethylene glycol-water such effect was evident at 25C only. Addition of amylose and methylcellulose respectively increased and decreased the net isosteric heat of moisture sorption of control starch film; for all the films developed exponential function fitted the net heat of sorption values at various moisture contents


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Abstract

Effect of incorporation of amylose and methylcellulose in glycerol-water as well as glycerol-polyethylene glycol-water plasticized starch films on their moisture sorption characteristic was determined at 25 35 and 45oC using isopiestic vapor transfer technique. Among the three models like GAB modified Oswin and Peleg for sorption modified Oswin was found to be the best describing the behavior. Within the temperature range studied methylcellulose reduced the moisture content of starch film for both the plasticizer systems. For amylose incorporation reduction in equilibrium moisture content occurred at all the temperatures for glycerol-water plasticizer whereas for glycerol-polyethylene glycol-water such effect was evident at 25C only. Addition of amylose and methylcellulose respectively increased and decreased the net isosteric heat of moisture sorption of control starch film; for all the films developed exponential function fitted the net heat of sorption values at various moisture contents

Additional Metadata

[error in script]
Item Type: Article
AGROVOC Term: Moisture content
AGROVOC Term: Sorption
AGROVOC Term: Amylose
AGROVOC Term: Carboxymethylcellulose
AGROVOC Term: Biopolymers
AGROVOC Term: Edible films
AGROVOC Term: Food processing
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 24 Apr 2025 06:27
URI: http://webagris.upm.edu.my/id/eprint/22265

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