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Related Concept Videos

Bioavailability: Overview01:17

Bioavailability: Overview

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Bioavailability refers to the proportion of an administered drug that reaches the systemic circulation in its active, unaltered form. It is a crucial pharmacokinetic parameter that determines the effectiveness of a drug in achieving its intended therapeutic outcomes. The route of administration significantly influences bioavailability, with intravenous administration achieving 100% bioavailability as the drug directly enters the bloodstream. In contrast, oral administration often results in...
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Bioavailability: Overview01:13

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Bioavailability refers to the proportion of an unaltered drug that, after administration, enters the systemic circulation and can be distributed to the desired action site. Factors such as gastrointestinal (GI) absorption and liver biotransformation influence the bioavailability of a drug when it is administered orally. When a drug is administered intravenously, it enters the systemic circulation directly; by definition, its bioavailability is assumed to be 100%. The bioavailability of an...
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Bioavailability Study Design: Absolute Versus Relative Bioavailability01:27

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Bioavailability is a crucial pharmacokinetic parameter that quantifies the proportion of an administered drug that reaches the systemic circulation and is available for therapeutic action. Regulatory agencies mandate the assessment of bioavailability, typically measured as the area under the drug plasma concentration-versus-time curve (AUC), to ensure the efficacy and safety of pharmaceutical products. These evaluations are categorized as absolute and relative bioavailability studies.Absolute...
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Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems01:22

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Body:Bioavailability is a critical pharmacological concept that measures the extent and rate at which an active drug ingredient or therapeutic moiety enters the systemic circulation, remaining unchanged. It's a pivotal factor in determining a drug's efficacy and safety.The Biopharmaceutics Classification System (BCS) plays an essential role in drug development by categorizing drugs into four classes based on their solubility and permeability. This classification aids in understanding drug...
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Bioavailability: Influencing Factors01:22

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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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Measurement of Bioavailability: Pharmacokinetic Methods01:30

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Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...
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Related Experiment Video

Updated: Feb 14, 2026

Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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Polyphenols and bioavailability: an update.

Hui Teng1, Lei Chen1

  • 1a College of Food Science , Fujian Agriculture and Forestry University , Fuzhou , Fujian , China.

Critical Reviews in Food Science and Nutrition
|February 7, 2018
PubMed
Summary
This summary is machine-generated.

Polyphenols show low oral bioavailability, complicating their use as chemoprevention or anti-diabetic agents. Re-evaluating bioaccessibility and considering metabolites is crucial for understanding their true therapeutic potential.

Keywords:
Polyphenolsbioavailabilitycatabolismcolon metabolites

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Area of Science:

  • Pharmacology
  • Nutritional Science
  • Metabolomics

Background:

  • Polyphenols are promising for chemoprevention and anti-diabetic effects but face challenges with low oral bioavailability.
  • This low bioavailability leads to ambiguous therapeutic outcomes and significant variations in clinical trials.

Purpose of the Study:

  • To critically review the evaluation of polyphenol bioactivity based on in vitro data.
  • To highlight the need for reconsidering bioaccessibility assessments and the role of metabolites.

Main Methods:

  • Review of existing cell culture, animal, and human studies on polyphenols.
  • Analysis of published data on in vitro bioactivity and bioavailability.

Main Results:

  • In vitro bioactivity evaluations may be unscientific and misleading due to overlooking metabolite contributions.
  • Newly identified circulating and excreted metabolites, especially colonic products, significantly impact polyphenol absorption and effects.
  • Phenolic metabolites, formed in the small intestine, liver, and by gut microbiota, are the active forms reaching tissues.

Conclusions:

  • Bioaccessibility values for polyphenols require re-evaluation considering the extensive range of identified metabolites.
  • Phenolic metabolites, not parent compounds, are primarily responsible for the observed bioactivity.
  • Further in vivo and in vitro mechanistic studies are essential to elucidate polyphenol interactions in physiological and pathological processes.