相关实验视频
Updated: Jun 26, 2025

08:46
Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
5.1K
探索粉结构和物理化学性质之间的关系:挤出对高原大麦面粉的影响
Fei Ge1, Yue Sun1, Chenxi Yang1
1College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China.
Food research international (Ottawa, Ont.)
|May 17, 2024
概括
挤出加工增强高地大麦粉 (HBF) 的营养价值,并通过改变粉结构来改善其物理化学特性. 这项技术为开发功能性和清洁标签食品产品提供了潜力.
科学领域:
- 食品科学与技术 食品科学与技术
- 谷物化学 谷物化学
- 材料科学 是一种材料科学.
背景情况:
- 高地大麦 (HB) 是一种营养丰富的高原谷物作物,由于高纤维和低质含量,其加工和味道具有挑战.
- 挤出技术是修改HB特性的一种有希望的方法,但它对粉结构和物理化学特性的影响需要进一步研究.
研究的目的:
- 综合调查挤出条件对高地大麦面粉 (HBF) 的物理化学性质的影响.
- 阐明挤出过程中粉的多层次结构变化及其与HBF特性的相关性.
主要方法:
- 在不同温度和湿度条件下对HBF进行挤出加工.
- 物理化学性质的分析,包括吸水能力,冷凝能力,峰值粘度和逆降解阻力.
- 微观和光谱技术用于研究粉结构的变化 (凝化,复合物形成,降解).
主要成果:
- 挤出显著增加了HBF中的可溶性食纤维和β-葡萄糖含量.
- 高温促进了粉的凝化,粉溶解和V型复合体的形成,增强了水的吸收,冷凝和粘度.
- 特定的挤出条件 (低温,高湿度) 导致粉降解,增加即时溶解度,改善逆向降解性.
结论:
- 挤出加工通过改变粉结构,有效地改变了HBF的营养和物理化学特性.
- 了解不同挤出参数下的结构性质关系是优化HBF用于功能性和清洁标签食品应用的关键.
- 这项研究为在开发基于HB的新型食品中利用挤出技术提供了有价值的见解.
相关概念视频
Polymer Classification: Architecture
2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.7K
Stress-Strain Diagram - Ductile Materials
707
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
707
Polymer Classification: Crystallinity
2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K
Protein and Protein Structure
79.5K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
79.5K
Thermal Strain
984
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...
984
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
264
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
264

