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Related Concept Videos

Biopharmaceutical Factors Influencing Drug Product Design: Overview01:22

Biopharmaceutical Factors Influencing Drug Product Design: Overview

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Rational drug product design integrates knowledge of the drug’s physicochemical properties, formulation components, manufacturing techniques, and intended route of administration. Each factor influences the drug’s performance, including how it is released, absorbed, and eliminated in the body.The physicochemical properties of a drug—such as solubility, stability, and particle size—affect its compatibility with excipients and the choice of dosage form. Excipients, though...
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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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Drug Product Performance: In Vitro–In Vivo Correlation01:20

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In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while...
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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...
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Model-Independent Approaches for Pharmacokinetic Data: Noncompartmental Analysis00:59

Model-Independent Approaches for Pharmacokinetic Data: Noncompartmental Analysis

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Noncompartmental analyses offer an alternative method for describing drug pharmacokinetics without relying on a specific compartmental model. In this approach, the drug's pharmacokinetics are assumed to be linear, with the terminal phase log-linear. This assumption allows for simplified analysis and interpretation of the drug's behavior in the body.
One important characteristic of noncompartmental analyses is that drug exposure increases proportionally with increasing doses. This...
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Related Experiment Video

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Cracking the Capsid Code: A Computationally Feasible Approach for Investigating Virus-Excipient Interactions in

Jonathan W P Zajac1,2, Idris Tohidian3, Praveen Muralikrishnan2,4

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.

Journal of Chemical Theory and Computation
|February 25, 2026
PubMed
Summary
This summary is machine-generated.

Developing stable viral biologics like vaccines requires understanding excipient interactions. A new computational method, CapSACIN, enables high-throughput analysis of these interactions, improving formulation strategies.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Vaccine Development

Background:

  • Viral biologics (vaccines, virus-like particles) have limited shelf life, hindering efficacy and distribution.
  • Excipients are crucial for stabilizing viral formulations, but identifying optimal ones is challenging due to complex interactions and vast design space.
  • Current molecular dynamics simulations struggle with the computational demands of large viral capsids.

Purpose of the Study:

  • To introduce CapSACIN, a novel computational framework for high-throughput, atomistic investigation of virus-excipient interactions.
  • To enable efficient exploration of the excipient design space for viral biologic stabilization.
  • To address the computational limitations of simulating large viral structures.

Main Methods:

  • Developed CapSACIN (Capsid Surface Abstraction and Computationally-Induced Nanofragmentation) framework.
  • Applied CapSACIN to model nonenveloped virus, porcine parvovirus (PPV).
  • Utilized molecular dynamics simulations on abstracted PPV surface models.

Main Results:

  • Identified that the 2-fold axis of symmetry in PPV is weaker at the molecular level compared to 3- and 5-fold axes.
  • Demonstrated excellent agreement between CapSACIN simulations and experimental data on excipient effects on PPV thermal stability.
  • Showcased CapSACIN's capability for high-throughput, atomistic resolution analysis of virus-excipient interactions.

Conclusions:

  • CapSACIN provides a computationally efficient method for studying virus-excipient interactions at the molecular level.
  • The framework aids in understanding capsid stability and optimizing formulations for viral biologics.
  • This approach accelerates the discovery of effective excipients, improving the shelf life and distribution of vaccines and related products.