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Related Concept Videos

In Vitro Drug Dissolution: Compendial Testing Models I01:13

In Vitro Drug Dissolution: Compendial Testing Models I

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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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In Vitro Drug Dissolution: Compendial Testing Models II01:09

In Vitro Drug Dissolution: Compendial Testing Models II

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Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
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In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

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Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
182
Drug Dissolution: Requirements and Profile Comparison01:14

Drug Dissolution: Requirements and Profile Comparison

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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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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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In Vitro Drug Release Testing: Overview, Development and Validation01:10

In Vitro Drug Release Testing: Overview, Development and Validation

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In vitro dissolution and drug release tests assess how quickly and how much of a drug is released from its dosage form into an aqueous medium under standardized laboratory conditions. These tests are essential tools in pharmaceutical development and quality assurance, offering insight into the drug's performance before clinical use.During formulation development, dissolution testing identifies incomplete or inconsistent drug release issues. It also supports decisions on selecting the optimal...
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Small-Volume Dissolution Testing of Pediatric Mini-Tablets Using Miniaturized USP Apparatuses: Regulatory and

Stefanie Broocks1, Melanie Gebhardt1, Sandra Klein2

  • 1Department of Pharmacy, Institute of Biopharmaceutics and Pharmaceutical Technology, University of Greifswald, 3 Felix Hausdorff Street, 17489, Greifswald, Germany.

AAPS Pharmscitech
|November 26, 2025
PubMed
Summary
This summary is machine-generated.

Mini-tablets (MTs) require specialized dissolution testing. A small-volume Reciprocating-Holder apparatus demonstrated superior sensitivity for evaluating extended-release (ER) mini-tablets compared to a Mini-Paddle system.

Keywords:
extended releasemini paddlequality controlreciprocating holdersmall-volume dissolution testing

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Area of Science:

  • Pharmaceutical Technology
  • Drug Delivery Systems
  • Analytical Chemistry

Background:

  • Mini-tablets (MTs) are crucial pediatric dosage forms, but lack standardized quality control (QC) methods, especially for extended-release (ER) formulations.
  • Existing QC methods may not adequately assess the performance of miniaturized drug delivery systems.

Purpose of the Study:

  • To evaluate two miniaturized dissolution apparatuses (Mini-Paddle and small-volume Reciprocating-Holder) for assessing ER MTs.
  • To determine the sensitivity and discriminatory power of these systems for pediatric drug products.

Main Methods:

  • Tested melatonin and sodium valproate ER MTs using Mini-Paddle (USP 2) and small-volume Reciprocating-Holder (USP 7) apparatuses.
  • Assessed drug release from individual and manipulated batches to evaluate method performance.

Main Results:

  • The Reciprocating-Holder apparatus provided sensitive, single-unit testing for both drug products, detecting batch variations.
  • The Mini-Paddle apparatus showed limitations with low-dose formulations, masking individual variability due to unit pooling.

Conclusions:

  • The small-volume Reciprocating-Holder is a promising tool for QC of ER MTs, offering superior sensitivity.
  • Standardized, miniaturized dissolution methods are urgently needed for regulatory acceptance and quality assurance of MTs.