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Related Concept Videos

Bioavailability: Influencing Factors01:22

Bioavailability: Influencing Factors

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Bioavailability refers to the extent and rate at which a drug reaches systemic circulation in its active form. Extent refers to the amount of the drug that makes it into circulation, while rate is the speed at which it enters circulation. It is influenced by several factors critical for optimizing drug formulations, dosing regimens, and therapeutic outcomes.Physicochemical properties of drugs and formulationsThe solubility, stability, and dissolution rate of a drug significantly impact its...
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Factors Influencing Bioavailability: First-Pass Elimination01:23

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When a drug is taken orally, it undergoes a journey starting from the gastrointestinal (GI) tract, passing through the portal vein, reaching the liver, and finally entering the systemic circulation. This process involves the absorption of the drug across the GI tract. The liver is the primary site for metabolizing the drug, with some metabolism also occurring in the gut wall. This journey significantly reduces the quantity of the drug that reaches the systemic circulation, a phenomenon known as...
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Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

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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 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 Drug Biotransformation: Biological01:19

Factors Affecting Drug Biotransformation: Biological

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Biological factors significantly impact drug metabolism, influencing drug clearance, efficacy, and potential toxicity.
Species differences: Variations in enzyme systems across species can cause disparities in drug metabolism. For instance, humans may metabolize certain drugs faster than rodents, altering therapeutic effects.
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Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs01:21

Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs

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A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
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Dietary factors affecting polyphenol bioavailability.

Torsten Bohn1

  • 1Centre de Recherche Public - Gabriel Lippmann, Environment and Agro-biotechnologies Department, Belvaux, Luxembourg.

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|May 16, 2014
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Summary
This summary is machine-generated.

Dietary polyphenols show health benefits in observational studies, but not always in trials. Food components and body processes significantly impact how well the body absorbs and uses these beneficial plant compounds.

Keywords:
absorptionbioaccessibilityfood preparationmatrix interactionsphytochemicals

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Food Science

Background:

  • Epidemiological studies link fruit and vegetable polyphenols to reduced chronic disease risk.
  • Intervention studies often fail to confirm these health benefits, indicating a complex interplay of factors.
  • Discrepancies may arise from differences in dosage, food matrix interactions, and polyphenol bioavailability.

Purpose of the Study:

  • To explore the reasons behind the discrepancy between observational and intervention studies on polyphenol health effects.
  • To elucidate the factors influencing polyphenol bioavailability, including dietary components and physiological processes.
  • To emphasize the importance of understanding these factors for accurate assessment of polyphenol bioactivity.

Main Methods:

  • Review of existing literature on polyphenol absorption, metabolism, and excretion.
  • Analysis of the impact of food matrix components (e.g., fiber, lipids, carbohydrates, minerals) on polyphenol bioaccessibility.
  • Consideration of endogenous factors like gut microbiota, digestive enzymes, and Phase II metabolism.

Main Results:

  • The food matrix significantly affects polyphenol bioaccessibility; dietary fiber and minerals may hinder absorption, while lipids and digestible carbohydrates can enhance it.
  • Endogenous factors, including microbiota and enzymes, alongside epithelial uptake mechanisms, modulate polyphenol bioavailability.
  • Polyphenols, such as flavonoids, can influence their own bioavailability by affecting metabolic enzymes and efflux transporters (e.g., p-glycoprotein).

Conclusions:

  • Polyphenol bioavailability is a critical determinant of their observed health effects, often differing between dietary intake and supplementation.
  • Dietary factors and physiological processes play a crucial role in modulating polyphenol absorption, metabolism, and efficacy.
  • Further research into these bioavailability factors is essential for understanding and harnessing the full potential of dietary polyphenols.