Journal article
Thermal transitions of rice: Development of a state diagram
Journal of food engineering, Vol.90(1), pp.110-118
2009
Handle:
https://hdl.handle.net/2376/110491
Abstract
A state diagram of
basmati rice was developed by measuring the glass line; glass transition temperature vs. solids content, freezing curve; initial freezing point vs. solids content and maximally freeze concentrated conditions by using the modulated differential scanning calorimetry (MDSC) method. In addition, a cooling curve method was used to measure the initial freezing point (
T
F) and the end point of freezing (
T
m
′
). The glass transition line of the state diagram was modeled using the Gordon–Taylor and linear equations, and the pattern of freezing curve was modeled using the Chen equation which incorporated unfreezable water. The condition of maximal-freeze-concentration corresponded to
X
s
′
(characteristic solids content)
=
0.60 and
T
m
′
(end point of freezing)
=
−3.6
°C obtained from freezing curve. The characteristics glass transition
T
g
′
=
−7.1
°C and corresponding solids content
X
s
″
=
0.66 were obtained by extending the freezing curve up to glass line modeled using linear equation. The
T
g
′
=
−11.6
°C and
X
s
″
=
0.82 were obtained when the glass line was modeled using Gordon–Taylor equation. Adsorption isotherms of rice were measured at room temperature by isopiestic method and data were modeled with BET and GAB equations. The BET and GAB monolayer values were found as 0.083 and 0.136
kg H
2O/kg dry solids, respectively. The state diagram and water sorption properties of
basmati rice can be useful in optimizing the drying and freezing processes as well as studying the physicochemical changes during storage.
Metrics
5 Record Views
Details
- Title
- Thermal transitions of rice: Development of a state diagram
- Creators
- Shyam S Sablani - Biological Systems Engineering Department, Washington State University, P.O. Box 646120, Pullman, WA 99164-6120, USALilia Bruno - Department of Chemistry, National University of Singapore, Block S8, Level 5, Science Drive 3, Singapore 117543, SingaporeStefan Kasapis - Department of Chemistry, National University of Singapore, Block S8, Level 5, Science Drive 3, Singapore 117543, SingaporeRoopesh M Symaladevi - Biological Systems Engineering Department, Washington State University, P.O. Box 646120, Pullman, WA 99164-6120, USA
- Publication Details
- Journal of food engineering, Vol.90(1), pp.110-118
- Academic Unit
- Biological Systems Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900546903401842
- Language
- English
- Resource Type
- Journal article