ステーキヌードルにおける温度媒介ゲル質感変換: グラス変換温度Tgに関して"
Hongxiao Liu1,2, Qing Hu1,2, Sha Yang2
1College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China.
Gels (Basel, Switzerland)
|August 28, 2025
まとめ
ポテトスターチヌードル (PSN) をガラス化温度 (Tg') 近くに冷凍すると,質感が最適化されます. -3°Cで冷凍されたヌードルは硬さ,凝結性,および望ましい微細構造を示し,冷凍食品の加工を改善しました.
科学分野:
- 食品科学
- 材料科学
- 物理化学
背景:
- ポテトスターチヌードル (PSN) は,主に高濃度のスターチゲルで,グルテンフリーなアジア食品です.
- 粉ゲルの質感は,凍結などの加工条件によって大きく影響されます.
- 凍結温度,特にガラスの移行温度 (Tg) の影響を理解することは,PSNの品質を最適化するために不可欠です.
研究 の 目的:
- 凍結温度がポテトスターチヌードル (PSN) の質感と微細構造に及ぼす影響を調査する.
- 特にガラスの移行温度 (Tg) に関して,PSNの品質を維持するための最適な凍結温度範囲を決定する.
- 凍結時にPSNの質感の変化の背後にあるメカニズムを解明する.
主な方法:
- 新鮮なPSNの凍結点 (-1 °C),超冷却温度 (-4.5 °C),およびガラス化温度 (Tg", -3.1 °C) の測定
- Tg'の範囲を中心に,さまざまな温度でPSNを体系的に凍結する.
- 凍結後のPSNの質感 (硬さ,粘着性,弹性,凝結性,性,弾性) と微細構造の分析
主要な成果:
- 凍結により,PSNの質感が大きく変化し,粘着性が低下し,硬さが増加した.
- -3°C (Tgに近い) で冷凍されたヌードルは,最も高い硬さ (14,065.77 g),弹性 (0.98),凝結性 (0.93),噛みつきやすさ (11,971.06),および弾性 (0.84),最小の粘着性を示した.
- Tg'の近くに凍結されたPSNは,粉の逆変換,高粉鎖の移動性,および小さな氷結晶に起因する優れた質感,連続した固体横断面,および密度の高い表面を示した.
- -3°Cで24時間冷凍すると,最もコンパクトで望ましい質感が得られます.
結論:
- ガラスの移行温度 (Tg) は,凍結中の粉凝固の質感形成に重要な役割を果たします.
- Tg"に近い温度でPSNを冷凍すると,質感の質と微細構造の整合性が著しく向上します.
- これらの発見は,PSNを含む粉ゲルベースの食品の冷凍加工を最適化するための貴重な洞察を提供します.
関連する概念動画
Problem Solving on Stress and Strain
1.1K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
1.1K
Heating and Cooling Curves
23.9K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
23.9K
Thermal Strain
2.3K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.3K
Le Chatelier's Principle: Changing Temperature
30.3K
Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
To understand this phenomenon, consider the elementary reaction:
30.3K
Phase Transitions: Melting and Freezing
13.1K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
13.1K
Temperature Dependent Deformation
191
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
191


