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Related Concept Videos

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

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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

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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...
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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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.
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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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Dairy Matrix Effects: Physicochemical Properties Underlying a Multifaceted Paradigm.

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The food product matrix significantly influences nutrient bioavailability and health outcomes, impacting properties beyond individual nutrient content. Dairy matrix effects, particularly in the stomach, explain unique health benefits not evident from nutrient composition alone.

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Area of Science:

  • Food Science
  • Nutrition Science
  • Biochemistry

Background:

  • Food products are often analyzed solely for nutrient content, neglecting crucial interactions within the food matrix.
  • The food matrix, encompassing component interactions and structure, dictates product properties and health impacts.
  • Understanding matrix effects is vital for a comprehensive view of food's role in nutrition and health.

Purpose of the Study:

  • To review dairy matrix effects and their impact on human nutrition and health.
  • To highlight how matrix effects explain health benefits of dairy products that nutrient composition alone cannot.
  • To emphasize the role of physiological processes, like gastric digestion, in mediating these effects.

Main Methods:

  • Literature review focusing on dairy matrix effects.
  • Analysis of scientific literature on food matrix interactions.
  • Examination of physiological responses to dairy consumption.

Main Results:

  • Dairy matrix effects are critical for understanding the nutrition and health impact of milk and dairy products.
  • Matrix effects explain phenomena like low glycemic response, dental health benefits, controlled amino acid absorption, and cardiovascular health.
  • Gastric digestion processes, such as casein micelle coagulation and fat globule creaming, are key to nutrient release kinetics.

Conclusions:

  • The food matrix, especially in dairy, plays a pivotal role in determining nutritional and health outcomes.
  • Dairy matrix effects provide a more complete explanation for the health benefits associated with dairy consumption.
  • Further research into food matrix interactions is essential for optimizing food's contribution to health.