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Related Concept Videos

Measurement of Bioavailability: Pharmacodynamic Methods01:20

Measurement of Bioavailability: Pharmacodynamic Methods

Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
Measurement of Bioavailability: Pharmacokinetic Methods01:30

Measurement of Bioavailability: Pharmacokinetic Methods

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...
Bioavailability Study Design: Absolute Versus Relative Bioavailability01:27

Bioavailability Study Design: Absolute Versus Relative Bioavailability

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...
Bioavailability: Influencing Factors01:22

Bioavailability: Influencing Factors

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...
Bioavailability: Overview01:13

Bioavailability: Overview

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...
Bioavailability: Overview01:17

Bioavailability: Overview

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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Definition of system suitability and proficiency testing acceptance criteria for the standardization of quality control methodologies of botanical bioactives: A case study for the development of AOAC Official Method of Analysis 2020.05 flavanols and procyanidins.

Food research international (Ottawa, Ont.)·2023
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Impact of polyphenol oxidase on the bioavailability of flavan-3-ols in fruit smoothies: a controlled, single blinded, cross-over study.

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Development and validation of HPLC-MS<sup>2</sup> methodology for the accurate determination of C4-C8 B-type flavanols and procyanidins.

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Updated: Jul 7, 2026

The Caco-2 Cell Bioassay for Measurement of Food Iron Bioavailability
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Cocoa flavanols - measurement, bioavailability and bioactivity.

Catherine Kwik-Uribe1, Roger M Bektash

  • 1Mars Inc. 800 High Street Hackettstown NJ 07840 USA. catherine.kwik-uribe@effem.com

Asia Pacific Journal of Clinical Nutrition
|May 28, 2008
PubMed
Summary
This summary is machine-generated.

Cocoa flavanols offer cardiovascular benefits but are complex to analyze. Accurate quantification methods are essential for dietary recommendations, as simpler assays are unreliable.

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Area of Science:

  • Food Science
  • Nutritional Biochemistry
  • Analytical Chemistry

Background:

  • Growing interest in cocoa's cardiovascular benefits.
  • Cocoa flavanols are absorbed, bioactive, and linked to heart health.
  • Flavanols present a complex mixture of stereoisomers.

Purpose of the Study:

  • Address challenges in quantitative analysis of cocoa flavanols.
  • Highlight limitations of simpler assays for flavanol content.
  • Emphasize the need for accurate methods for dietary guidance.

Main Methods:

  • Discusses the complexity of cocoa flavanol stereochemistry.
  • Reviews existing analytical methodologies for flavanol quantification.
  • Critiques the use of total phenolic content and antioxidant potential assays.

Main Results:

  • Accurate analytical methods confirm flavanol absorption and bioactivity.
  • Simpler assays (total phenolics, antioxidant potential) lack specificity for flavanols.
  • Sophisticated instrumentation is required for precise flavanol analysis.

Conclusions:

  • Precise quantification of cocoa flavanols is crucial.
  • Inaccurate assays can lead to misleading physiological effect studies.
  • Reliable methods are necessary for evidence-based dietary recommendations on cocoa consumption.