TY - JOUR
T1 - Thermal characteristics of a water soluble extract obtained from pomegranate skin
T2 - Developing a state diagram for determining stability
AU - Al-Rawahi, Amani
AU - Rahman, Mohammad Shafiur
AU - Waly, Mostafa
AU - Guillemin, Gilles J.
PY - 2013/7
Y1 - 2013/7
N2 - A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.
AB - A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.
UR - http://www.scopus.com/inward/record.url?scp=84878537452&partnerID=8YFLogxK
U2 - 10.1016/j.indcrop.2013.04.021
DO - 10.1016/j.indcrop.2013.04.021
M3 - Article
AN - SCOPUS:84878537452
SN - 0926-6690
VL - 48
SP - 198
EP - 204
JO - Industrial Crops and Products
JF - Industrial Crops and Products
ER -