Effect of barley antifreeze protein on thermal properties and water state of dough during freezing and freeze-thaw cycles

2015 ◽  
Vol 47 ◽  
pp. 32-40 ◽  
Author(s):  
Xiangli Ding ◽  
Hui Zhang ◽  
Li Wang ◽  
Haifeng Qian ◽  
Xiguang Qi ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Antifreeze Protein ◽  
Freeze Thaw ◽  
Water State

Preparation, Properties of Partially Hydrolized Guar Gum

2013 ◽  
Vol 781-784 ◽  
pp. 1901-1906 ◽  
Author(s):  
Min Sun ◽  
Hong Bo Tang ◽  
Si Qing Dong ◽  
Yan Ping Li
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Hydrochloric Acid ◽  
Mass Concentration ◽  
Guar Gum ◽  
Water Soluble ◽  
Freeze Thaw ◽  
Thermogravimetric Analyzer ◽  
Partially Hydrolyzed Guar Gum ◽  
Guar Seed

Guar gum is a highly viscous water soluble heteropolysaccharide obtained from guar seed endosperm portion. Partially hydrolyzed guar gum (PHGG) is low in viscosity and has the healthy benefits as the dietary fiber. In this study, the effect of amount of acidolysis agent, ethanol content, acidolysis temperature and time on the acidolysis degree of guar gum was investigated by using the solvent method. The thermal properties were characterized by the idifferential scanning calorimeter and thermogravimetric analyzer, respectively. It was showed that the better conditions for preparing PHGG were: acidolysis temperature 40°C, acidolysis time 4h, ethanol mass concentration 61%, respectively. The freeze-thaw stability, expansion capability decreased after guar gum was partially hydrolized by hydrochloric acid. The onset temperature, end temperature and peak temperature of PHGG all increased, but its melting enthalpy and thermal stability were reduced, compared with those of guar gum.

Water state diagram and thermal properties of fructans powders

2017 ◽  
Vol 132 (1) ◽  
pp. 197-204 ◽  
Author(s):  
Hugo Espinosa-Andrews ◽  
Rogelio Rodríguez-Rodríguez
Keyword(s):  
Thermal Properties ◽  
State Diagram ◽  
Water State

scholarly journals Influence of Freeze/Thaw Cycles on Mechanical and Thermal Properties of Masonry Wall and Masonry Wall Materials

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1464 ◽  
Author(s):  
Ivanka Netinger Grubeša ◽  
Mihaela Teni ◽  
Hrvoje Krstić ◽  
Martina Vračević
Keyword(s):  
Thermal Properties ◽  
Energy Demand ◽  
Greenhouse Gas Emission ◽  
Masonry Wall ◽  
Mechanical And Thermal Properties ◽  
Historical Building ◽  
Typical Structure ◽  
Freeze Thaw ◽  
Freeze And Thaw ◽  
Before And After

In this study, the influence of freeze/thaw cycles on the mechanical and thermal properties of bricks and mortar as building parts of masonry walls, as well as the influence on the masonry wall itself is investigated. At the material level, the influence of freeze and thaw cycles on the mechanical and thermal properties of masonry components (bricks and mortar) was investigated; at the construction level, the influence of freeze and thaw cycles on the mechanical and thermal properties of a masonry wall was studied. To study the influence of freezing on the energy demand characteristics of masonry buildings, in terms of energy conservation and greenhouse gas emission, a case study was investigated on a typical structure of a historical building located in Croatia, that had undergone a process of energy certification. The applied freeze/thaw regime negatively influenced the compressive strength and the thermal properties of bricks and mortar, as well as the mechanical and thermal properties of the wall. Considering the thermal properties of the material before and after its exposure to freeze/thaw cycles, we concluded that the annual energy consumption, the heating costs, and the CO2 emission of a family house could increase up to 3.7% after frost action in the studied case.

scholarly journals Thermal Properties of Conventional and High-strength Concrete

2018 ◽  
Vol 245 ◽  
pp. 06005 ◽  
Author(s):  
Tatiana Musorina ◽  
Alexsander Katcay ◽  
Mikhail Petrichenko ◽  
Anna Selezneva
Keyword(s):  
Thermal Properties ◽  
Thermophysical Properties ◽  
High Strength Concrete ◽  
High Strength ◽  
Temperature Fluctuations ◽  
Conventional Concrete ◽  
Freeze Thaw ◽  
Strength Concrete ◽  
Concrete Properties ◽  
Cold Chamber

Important characteristics for the Nordic countries: a freeze-thaw resistance and an ability of a material to keep heat inside the building. This paper aims to define the thermophysical properties of a high-strength concrete, compare the discovered performance with the conventional concrete properties. With this object in mind two experiments in cold chamber “CHALLENGE 250” have been conducted and followed by analysis. In these experiments, the insulation of facades is beyond the framework of the investigation. Only the thermophysical properties of concrete are taken into account. The samples were affected by temperature fluctuations. Results from the experiments show that strength characteristics of a material are in indirect ratio to accumulation properties of a structure. This conclusion is directly related to porosity of material and additives. During 70 minutes, with outside temperature being below zero, the temperature inside the concrete dropped to an average. As the outside temperature increases significantly to more than zero, the temperature inside the concrete has become below average (continued to decline) in 70 minutes. The more strength of material, the better thermophysical properties. High-strength concrete is less susceptible to temperature fluctuations, therefore more heat-resistant. As mentioned in the paper below, the material has one disadvantage: this is a large cost per cubic meter.

An insect antifreeze protein from Anatolica polita enhances the cryoprotection of Xenopus laevis eggs and embryos

2022 ◽  
Author(s):  
Predrag Jevtić ◽  
K. Wade Elliott ◽  
Shelby E. Watkins ◽  
Jonathan A. Sreter ◽  
Katarina Jovic ◽  
...  
Keyword(s):  
Xenopus Laevis ◽  
Antifreeze Proteins ◽  
Antifreeze Protein ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Freeze Resistance ◽  
Freeze Thaw ◽  
Cryoprotective Agents ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

Cryoprotection is of interest in many fields of research, necessitating a greater understanding of different cryoprotective agents. Antifreeze proteins have been identified that have the ability to confer cryoprotection in certain organisms. Antifreeze proteins are an evolutionary adaptation that contributes to the freeze resistance of certain fish, insects, bacteria, and plants. These proteins adsorb to an ice crystal's surface and restrict its growth within a certain temperature range. We investigated the ability of an antifreeze protein from the desert beetle Anatolica polita, ApAFP752, to confer cryoprotection in the frog Xenopus laevis. X. laevis eggs and embryos microinjected with ApAFP752 exhibited reduced damage and increased survival after a freeze/thaw cycle in a concentration-dependent manner. We also demonstrate that ApAFP752 localizes to the plasma membrane in eggs and embryonic blastomeres and is not toxic for early development. These studies show the potential of an insect antifreeze protein to confer cryoprotection in amphibian eggs and embryos.

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