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Related Concept Videos

In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

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...
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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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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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, maintaining...
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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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Development of an In Vitro Ocular Platform to Test Contact Lenses
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Studies on Indomethacin Intraocular Implants Using Different in vitro Release Methods.

J Balasubramaniam1, A Srinatha, J K Pandit

  • 1ISP (Hong Kong) Limited, H. No 6-3-1090/A, Bhupal Towers, Rajbhavan Road, Somajiguda, Hyderabad-500 082, India.

Indian Journal of Pharmaceutical Sciences
|January 5, 2010
PubMed
Summary
This summary is machine-generated.

This study developed intraocular implants using sodium alginate and hydroxypropylmethylcellulose for indomethacin drug delivery. Hydroxypropylmethylcellulose inclusion decreased drug release, with agar diffusion and flow-through methods better simulating in vivo conditions.

Keywords:
Intraocular implantsdissolutionin vitro releaseindomethacinsodium alginate

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Area of Science:

  • Ophthalmic Drug Delivery
  • Biomaterials Science
  • Pharmaceutical Technology

Background:

  • Intraocular implants are crucial for sustained drug delivery in ophthalmology.
  • Sodium alginate and hydroxypropylmethylcellulose are explored as potential biomaterials for these implants.
  • Controlling drug release kinetics from intraocular devices is essential for therapeutic efficacy.

Purpose of the Study:

  • To formulate and evaluate intraocular implants containing indomethacin using sodium alginate and hydroxypropylmethylcellulose.
  • To assess the impact of formulation variables (e.g., hydroxypropylmethylcellulose concentration, calcium chloride) on indomethacin release.
  • To compare the performance of different drug release testing methods for intraocular implants.

Main Methods:

  • Formulation of indomethacin-loaded sodium alginate implants with varying hydroxypropylmethylcellulose content.
  • Drug release studies using static method, in-house continuous flow-through apparatus, USP dissolution, and agar diffusion.
  • Analysis of indomethacin particle size and agar concentration effects on drug release.

Main Results:

  • Indomethacin particle size did not affect release, except in the static method.
  • Increased agar concentration (1-2%) significantly reduced drug release in agar diffusion method.
  • Hydroxypropylmethylcellulose inclusion consistently decreased indomethacin release across all tested methods.

Conclusions:

  • Hydroxypropylmethylcellulose incorporation effectively modulates indomethacin release from sodium alginate intraocular implants.
  • Agar diffusion and continuous flow-through methods show promise for simulating in vivo drug release conditions for intraocular devices.
  • Static and USP dissolution methods may not accurately represent the hydrodynamic conditions around intraocular implants.