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Related Concept Videos

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Product specifications define the acceptable quality of a pharmaceutical product by ensuring identity, purity, potency, and strength. These specifications serve as benchmarks during development, manufacturing, and post-approval quality control. Clinically relevant specifications are particularly important because they directly relate to a drug's safety and efficacy in clinical use.Dissolution studies are critical biopharmaceutic tools that link in vitro behavior to in vivo performance. They...
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Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
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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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In Vitro Drug Dissolution: Compendial Testing Models I01:13

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Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
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The acceptance criteria for dissolution profile data are anchored in Q values, representing the percentage of drug dissolved within a specified period. This assessment unfolds in three stages:First Stage: The test passes if all six drug dosage units are equal to or greater than Q plus 5%; otherwise, the sample proceeds to the second stage.Second Stage: The average of twelve units must be equal to or greater than Q, with no unit falling below Q - 15% to pass; if not, it progresses to the final...
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Updated: May 2, 2026

Identification of Pharmaceuticals in The Aquatic Environment Using HPLC-ESI-Q-TOF-MS and Elimination of Erythromycin Through Photo-Induced Degradation
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Lessons learned from water/sediment-testing of pharmaceuticals.

Michael Radke1, Michael P Maier2

  • 1Department of Applied Environmental Science, Stockholm University, Svante-Arrhenius-Väg 8, 10691 Stockholm, Sweden.

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|March 8, 2014
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Summary

River sediment transformation capacity does not predict pharmaceutical removal. Actual elimination depends on physical conditions, not just sediment properties, highlighting variability in environmental risk assessment.

Keywords:
BiotransformationOrganic micropollutantsPersistence assessmentRiver sediment

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Riverine Biogeochemistry

Background:

  • Pharmaceuticals in rivers show variable removal rates despite similar characteristics.
  • River sediments are crucial for pharmaceutical transformation, but their predictive power is unclear.
  • Existing water/sediment tests may not fully capture in-situ pharmaceutical fate.

Purpose of the Study:

  • To investigate if river sediment transformation capacity explains observed pharmaceutical removal differences.
  • To evaluate the diagnostic power of water/sediment tests for predicting pharmaceutical fate.
  • To assess the influence of physical boundary conditions versus sediment properties on pharmaceutical elimination.

Main Methods:

  • Incubation experiments using sediments from three different rivers.
  • Testing the transformation of nine selected pharmaceutical compounds.
  • Monitoring dissipation half-lives and identifying removal processes (biotransformation).
  • Investigating transformation onset under changing oxygen conditions.
  • Assessing transformation rate variability within a single river system.

Main Results:

  • Biotransformation was the primary removal process for most pharmaceuticals, with half-lives ranging from 2.5 to 56 days.
  • Sediment from River Roter Main showed higher removal efficiency than River Gründlach, contrary to previous field observations.
  • Physical boundary conditions, not sediment transformation potential, appear to govern actual pharmaceutical elimination.
  • Oxygen introduction to anoxic systems triggered immediate pharmaceutical transformation.
  • In-stream variability in transformation rates within one river reached up to a factor of 2.5.

Conclusions:

  • River sediment transformation capacity is a poor predictor of in-situ pharmaceutical removal.
  • Physical boundary conditions significantly influence pharmaceutical elimination in rivers.
  • Considerable in-stream variability in transformation rates complicates environmental risk assessment.
  • Current reliance on single cutoff values for persistence evaluation may be insufficient.