State Diagram of Freeze-dried Garlic Powder by Differential Scanning Calorimetry and Cooling Curve Methods

2005 ◽  
Vol 70 (2) ◽  
pp. E135-E141 ◽  
Author(s):  
M. Shafiur Rahman ◽  
Shyam S. Sablani ◽  
N. Al-Habsi ◽  
S. Al-Maskri ◽  
R. Al-Belushi
Keyword(s):  
Differential Scanning Calorimetry ◽  
State Diagram ◽  
Cooling Curve ◽  
Scanning Calorimetry ◽  
Garlic Powder ◽  
Freeze Dried

Thermal Analysis of Aluminum Alloys

2019 ◽  
Author(s):  
Daniel Larouche
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Quality Control ◽  
Aluminum Alloys ◽  
Isothermal Calorimetry ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Scanning Calorimetry ◽  
Cooling Curve Analysis ◽  
Scientists And Engineers

Thermal analysis is applied on aluminum alloys by researchers to investigate mainly phase transformations, while it is regularly used for quality control purposes in industry. Techniques like cooling curve analysis, differential thermal analysis, differential scanning calorimetry, and isothermal calorimetry are amongst those most frequently used by scientists and engineers. These techniques will be described, and a mathematical description of the results will be developed. State-of-the-art quantification methods applied on aluminum alloys will be presented and criticized based on specific examples taken from the literature.

Comparison of the Thermal Transitions of Spray-Dried and Freeze-Dried Egg Whites by Differential Scanning Calorimetry

2020 ◽  
Vol 13 (8) ◽  
pp. 1329-1343
Author(s):  
Jin-Hong Zhao ◽  
Li-Sha Liu ◽  
Shyam S. Sablani ◽  
Yi-Jiao Peng ◽  
Hong-Wei Xiao ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Transitions ◽  
Scanning Calorimetry ◽  
Freeze Dried ◽  
Spray Dried

Sorption Isotherm, Glass Transitions and State Diagram for Freeze-dried Plum Skin and Pulp

2006 ◽  
Vol 12 (3) ◽  
pp. 181-187 ◽  
Author(s):  
V. R. Nicoletti Telis ◽  
P. J. do Amaral Sobral ◽  
J. Telis-Romero
Keyword(s):  
Glass Transition ◽  
Moisture Content ◽  
Sorption Isotherm ◽  
State Diagram ◽  
Transition Curve ◽  
Glass Transitions ◽  
Water Addition ◽  
Scanning Calorimetry ◽  
Freeze Dried ◽  
The Matrix

Differential scanning calorimetry (DSC) was used to determine phase transitions of freeze-dried plums. Samples at low and intermediate moisture contents, were conditioned by adsorption at various water activities (0.11≤aw≤0.90) at 25°C, whereas in the high moisture content region (aw>0.90) samples were obtained by direct water addition, with the resulting sorption isotherm being well described by the Guggenheim-Anderson-deBoer (GAB) model. Freeze-dried samples of separated plum skin and pulp were also analysed. At aw≤0.75, two glass transitions were visible, with the glass transition temperature (Tg) decreasing with increasing aw due to the water plasticising effect. The first Tg was attributed to the matrix formed by sugars and water. The second one, less visible and less plasticised by water, was probably due to macromolecules of the fruit pulp. The Gordon-Taylor model represented satisfactorily the matrix glass transition curve for aw≤0.90. In the higher moisture content range Tg remained practically constant around Tg′ (−57.5°C). Analysis of the glass transition curve and the sorption isotherm indicated that stability at a temperature of 25°C, would be attained by freeze dried plum at a water activity of 0.04, corresponding to a moisture content of 12.9% (dry basis).

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