LOGAN PERMETRO 800 8-Position Dissolution-Permeation System

Overview

The LOGAN PERMETRO 800 is an integrated, offline 8-position dissolution-permeation system engineered for rigorous in vitro assessment of drug product performance under physiologically relevant conditions. Unlike conventional dissolution testers, the PERMETRO 800 couples standardized USP Apparatus 1 (basket) and Apparatus 2 (paddle) dissolution with a parallel, synchronized permeation module—enabling simultaneous quantification of both drug release kinetics and membrane permeability across biorelevant barriers. This dual-parameter capability supports mechanistic understanding of formulation-dependent absorption behavior, particularly critical during generic drug development and bioequivalence (BE) risk mitigation. The system operates on the principle of sink-condition dissolution followed by diffusion-controlled transport across synthetic or biological membranes (e.g., PAMPA, Caco-2 monolayers, or excised intestinal tissue), generating time-resolved concentration profiles for both donor and acceptor compartments. Its architecture complies with core regulatory expectations for dissolution method validation per USP , , and ICH Q5A guidelines, and supports data integrity requirements aligned with FDA 21 CFR Part 11 when paired with compliant software.

Key Features

• Integrated dual-pump sampling architecture: Independent, programmable peristaltic pumps for dissolution and permeation sampling—eliminating cross-contamination and enabling staggered or synchronized time-point collection.
• Physiologically accurate permeation module: Modular chamber design accommodates standard 24-well or 96-well permeation inserts; compatible with artificial membranes (e.g., PAMPA lipid formulations) and cultured cell monolayers (Caco-2, MDCK).
• Precision thermal control: Dual-zone temperature regulation—dissolution vessels maintained at 37.0 ±0.1 °C via dry-heated block; water bath (18 L capacity) independently controlled from ambient to 45 °C with 0.1 °C resolution for auxiliary temperature-sensitive assays.
• Mechanical robustness: Low-wobble drive mechanism ensures paddle wobble ≤0.5 mm and basket wobble ≤1.0 mm—meeting USP mechanical calibration specifications for apparatus qualification.
• Modular expandability: UDT-818A-8 dissolution base unit serves as foundation; optional accessories include automated fraction collectors, UV/Vis flow cells, and HPLC interface kits for real-time analytical coupling.
• Tool-free maintenance design: Dry-heating block eliminates water-bath contamination risks; all wetted surfaces are autoclavable or solvent-rinsable, supporting GLP-compliant cleaning validation protocols.

Sample Compatibility & Compliance

The PERMETRO 800 accommodates solid oral dosage forms—including immediate-release tablets, extended-release capsules, orally disintegrating tablets (ODTs), and multiparticulate systems—across all eight vessels. Permeation modules accept standard commercial membrane inserts and custom-mounted tissue sections. System validation documentation includes IQ/OQ protocols compliant with ASTM E2503 and USP . Data acquisition workflows support audit trails, electronic signatures, and user access controls when operated with LOGAN’s validated WinDiss software—facilitating compliance with FDA 21 CFR Part 11, EU Annex 11, and WHO TRS 996 requirements for computerized systems in pharmaceutical quality control.

Software & Data Management

Controlled via LOGAN WinDiss v5.x, the system provides full method programming (temperature ramping, speed profiling, multi-stage sampling schedules), real-time graphing of dissolution/permeation curves, and export to CSV, Excel, or LIMS-compatible XML formats. Software features include automated calculation of f₂ similarity factor, permeability coefficient (P_app), and cumulative mass transfer; all calculations adhere to ICH Q5A and EMA CHMP reflection paper on permeability assessment. Audit trail functionality logs all parameter changes, user actions, and system events with timestamp and operator ID—essential for GMP-regulated environments undergoing regulatory inspection.

Applications

• Bioequivalence bridging studies: Correlating in vitro dissolution-permeation profiles between reference listed drugs (RLDs) and generic candidates to prioritize BE trial candidates.
• Formulation optimization: Evaluating impact of excipients (e.g., surfactants, polymers) on both release rate and membrane partitioning efficiency.
• BCS classification support: Generating high-resolution P_app data for Biopharmaceutics Classification System Category II and IV compounds.
• Food-effect simulation: Coupling gastric-phase dissolution with intestinal permeation under variable pH and bile salt conditions.
• Regulatory submission packages: Providing supplementary in vitro data for ANDA filings, especially where clinical BE studies present ethical or feasibility constraints.

FAQ

Can the PERMETRO 800 operate under non-sink conditions for poorly soluble compounds?

Yes—the system allows programmable volume reduction, surfactant addition, and dynamic media replacement to model non-sink dissolution while maintaining synchronized permeation sampling.
Is the permeation module compatible with live cell monolayers?

Yes—chamber geometry and fluid shear profiles are optimized for Caco-2 and MDCK cultures; optional CO₂/humidity control modules available for long-duration assays.
Does the system meet USP apparatus mechanical calibration requirements?

Yes—mechanical verification reports confirm compliance with USP specifications for centering, wobble, and vertical alignment across all eight positions.
Can dissolution and permeation samples be collected into the same vial rack?

No—dual independent collector trays prevent cross-contamination; however, time-stamped metadata synchronization ensures precise alignment of paired datasets.
What validation documentation is supplied with the system?

Factory-issued IQ/OQ protocols, mechanical calibration certificates, temperature mapping reports, and pump accuracy verification data are included with each shipment.