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Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems

Bioavailability Enhancement: Determination and Conceptual Approaches in Overcoming Bioavailability Problems

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 absorption...

Bioavailability: Influencing Factors

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 Enhancement: Drug Stability Enhancement and GI Retention

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...

Bioavailability Enhancement: Drug Solubility Enhancement

Bioavailability Enhancement: Drug Solubility Enhancement

Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...

Factors Influencing Bioavailability: First-Pass Elimination

Factors Influencing Bioavailability: First-Pass Elimination

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...

Bioavailability: Overview

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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Towards bioavailability-based soil criteria: past, present and future perspectives.

Ravi Naidu¹, Rufus Channey, Stuart McConnell

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Summary

Bioavailability, a poorly quantified factor in chemical risk assessment, is increasingly accepted for site evaluation. Incorporating bioavailability and bioaccessibility can lead to sustainable risk assessment and remediation strategies.

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Area of Science:

Environmental Science
Risk Assessment
Toxicology

Background:

Bioavailability is a key, yet poorly quantified, indicator in chemical risk assessment.
Current site assessment relies on threshold contaminant concentrations, with limited application of bioavailability due to definition and measurement uncertainties.
Recent advancements have improved research and acceptance of bioavailability in risk assessment.

Purpose of the Study:

To summarize the application of contaminant bioavailability and bioaccessibility in assessing contaminated sites.
To explore the potential of bioavailability as a basis for sustainable risk assessment and remediation.
To highlight the shift towards a more sophisticated, risk-based approach in environmental management.

Main Methods:

Review of recent developments in bioavailability research.
Analysis of the application of bioavailability and bioaccessibility in site assessment frameworks.
Examination of regulatory acceptance and decision-making processes.

Main Results:

Bioavailability research has seen significant development and increased acceptance over the last decade.
The integration of bioavailability into decision-making is driving a shift towards risk-based approaches.
Regulatory organizations are increasingly accepting the concept of bioavailability.

Conclusions:

Bioavailability and bioaccessibility should form the basis for risk assessment and remediation goals at contaminated sites.
Sustainable risk assessment and remediation strategies can be developed using bioavailability.
The application of bioavailability is expected to grow in Europe, North America, and Australia over the next decade.