TY - JOUR
T1 - Thermal characteristics and state diagram of freeze-dried broccoli
T2 - Freezing curve, maximal-freeze-concentration condition, glass line and solids-melting
AU - Suresh, Sithara
AU - Al-Habsi, Nasser
AU - Guizani, Nejib
AU - Rahman, Mohammad Shafiur
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/9/10
Y1 - 2017/9/10
N2 - Stability of foods during processing and storage can be determined from their phase and state diagrams. In this study, state diagram of broccoli was developed considering freezing curve, glass line, maximal-freeze-concentration conditions, solids-melting and BET-monolayer line. The freezing point, glass transition and solids-melting were measured and modeled by Chen's model, Gordon-Taylor model, and Flory-Huggins model, respectively. The ultimate maximal-freeze-concentration conditions (Tm′)u (i.e. end temperature of freezing) and (Tg′′′)u [i.e. end glass transition at (Tm′)u] were found as −30.0 °C and −32.2 °C, respectively, and solids content (i.e. Xs′) at this point was 0.70 g/g sample. The solids-water interaction (χ) during melting was estimated as 0.69 (dimensionless) from Flory-Huggins model, and BET-monolayer was observed as 0.089 g/g dry-solids at 20 °C.
AB - Stability of foods during processing and storage can be determined from their phase and state diagrams. In this study, state diagram of broccoli was developed considering freezing curve, glass line, maximal-freeze-concentration conditions, solids-melting and BET-monolayer line. The freezing point, glass transition and solids-melting were measured and modeled by Chen's model, Gordon-Taylor model, and Flory-Huggins model, respectively. The ultimate maximal-freeze-concentration conditions (Tm′)u (i.e. end temperature of freezing) and (Tg′′′)u [i.e. end glass transition at (Tm′)u] were found as −30.0 °C and −32.2 °C, respectively, and solids content (i.e. Xs′) at this point was 0.70 g/g sample. The solids-water interaction (χ) during melting was estimated as 0.69 (dimensionless) from Flory-Huggins model, and BET-monolayer was observed as 0.089 g/g dry-solids at 20 °C.
KW - BET- monolayer
KW - Glass transition
KW - Maximal-freeze-concentration condition
KW - Solids-melting temperature
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U2 - 10.1016/j.tca.2017.06.015
DO - 10.1016/j.tca.2017.06.015
M3 - Article
AN - SCOPUS:85021370384
SN - 0040-6031
VL - 655
SP - 129
EP - 136
JO - Thermochimica Acta
JF - Thermochimica Acta
ER -