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相关概念视频

Factors Influencing Drug Absorption: Physicochemical Parameters01:22

Factors Influencing Drug Absorption: Physicochemical Parameters

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
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Factors Influencing Drug Absorption: Pharmaceutical Parameters01:28

Factors Influencing Drug Absorption: Pharmaceutical Parameters

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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

202
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
202
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

301
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH01:21

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Drug absorption within the gastrointestinal (GI) tract is a complex process influenced by several critical factors, including the site pH, the drug's dissociation constant (pKa), and the drug's lipophilicity. The GI tract exhibits a pH gradient, with an acidic environment in the stomach and a more alkaline environment in the small intestine. This pH variation directly affects the ionization state of drugs.
A drug's pKa and the pH of the gastrointestinal (GI) tract play crucial roles...
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Role of Matrix Metalloproteases in Degradation of ECM01:23

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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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乳制品矩阵效应:一个多面性范式的基础的物理化学性质.

Thom Huppertz1,2, Blerina Shkembi1, Lea Brader3

  • 1Food Quality & Design Group, Wageningen University & Research, 6808 WG Wageningen, The Netherlands.

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概括

食品产品矩阵显著影响营养物质的生物可用性和健康结果,影响超出个人营养物质含量之外的特性. 乳制品矩阵效应,特别是在胃中,解释了独特的健康益处,这些益处不仅仅来自营养成分.

关键词:
吸收 吸收 吸收 吸收组件相互作用 组件相互作用乳制品 乳制品是一种乳制品.消化 消化 消化 消化健康的健康健康的健康.矩阵效应是一个矩阵效应.营养 营养 营养 营养产品矩阵是一个产品矩阵.产品结构 产品结构

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科学领域:

  • 食品科学 食品科学 食品科学
  • 营养科学 营养科学
  • 生物化学 生物化学

背景情况:

  • 食品经常仅仅以营养成分进行分析,忽视了食品矩阵内的关键相互作用.
  • 食品矩阵包括成分相互作用和结构,决定产品的特性和对健康的影响.
  • 了解矩阵效应对于全面了解食物在营养和健康中的作用至关重要.

研究的目的:

  • 审查乳制品矩阵效应及其对人类营养和健康的影响.
  • 要强调矩阵效应如何解释乳制品的健康益处,而营养成分本身无法解释.
  • 要强调生理过程的作用,如胃消化,在调解这些影响.

主要方法:

  • 文献综述,重点关注乳制品矩阵效应.
  • 对食品矩阵相互作用的科学文献进行分析.
  • 对乳制品消费的生理反应的检查.

主要成果:

  • 乳制品矩阵效应对于理解牛奶和乳制品对营养和健康的影响至关重要.
  • 矩阵效应解释了诸如低血糖反应,牙健康益处,控制氨基酸吸收和心血管健康等现象.
  • 胃消化过程,如素小细胞凝结和脂肪球体化,是营养物质释放动力学的关键.

结论:

  • 食品矩阵,特别是乳制品,在确定营养和健康结果方面发挥着关键作用.
  • 乳制品矩阵效应为与乳制品消费相关的健康益处提供了更完整的解释.
  • 对食物矩阵相互作用的进一步研究对于优化食物对健康的贡献至关重要.