Agilent VK7025 Dissolution Tester

Overview

The Agilent VK7025 Dissolution Tester is a second-hand, fully validated benchtop dissolution system originally developed by Varian (acquired by Agilent Technologies in 2010). As the world’s first “V-frame” dissolution apparatus, it was engineered to meet stringent regulatory requirements for pharmaceutical quality control and formulation development under USP <711>, EP 2.9.3, JP XVII, and ChP 0931. Its core measurement principle follows the standardized hydrodynamic conditions defined for USP Apparatus 1 (basket) and Apparatus 2 (paddle), ensuring reproducible fluid dynamics across all six vessels. The system operates on a robust mechanical architecture featuring low-profile drive shafts, minimized vibration via external recirculating water bath control, and precision-engineered vertical alignment mechanisms—critical for maintaining consistent sinker immersion depth and rotational stability over extended test durations (up to 8 days continuously). Designed for GMP-compliant environments, the VK7025 integrates hardware-level temperature monitoring, time-stamped event logging, and deterministic actuation sequences to support full traceability.

Key Features

• Motorized, synchronized sampling arm with programmable timing—enables both simultaneous and sequential sampling without manual intervention.
• Dedicated Drug Delivery Module (DDM) supporting programmable synchronous or staggered dosing events—essential for multi-phase release profiling and delayed-release formulations.
• Independent, motorized temperature probe per vessel—provides real-time, logged temperature data at the dissolution medium level, satisfying FDA and EMA requirements for thermal validation.
• TruCenter™ magnetic cup alignment system—eliminates mechanical adjustment; ensures repeatable centering of baskets/paddles within ±0.2 mm tolerance.
• One-piece PETG water bath tank with rapid drain port and integrated anti-evaporation dome lids—minimizes solvent loss and maintains constant volume throughout testing.
• V-frame structural design—reduces overall footprint while enabling unobstructed visual observation of dissolution behavior across all six vessels.
• Interchangeable basket/paddle assemblies—height calibration remains invariant during method switching, reducing setup error and qualification effort.
• Backlit 4×40 character LCD display with password-protected parameter configuration—supports 21 CFR Part 11 user role management and audit-ready operation logs.

Sample Compatibility & Compliance

The VK7025 accommodates standard 1 L USP-compliant dissolution vessels, with optional configurations available for 100 mL, 200 mL, and 2 L vessels—supporting immediate-release tablets, extended-release capsules, transdermal patches, and enteric-coated dosage forms. Its mechanical design inherently satisfies the mechanical calibration criteria outlined in USP <711> (wobble ≤ 2 mm, centering ≤ 2 mm, verticality ≤ 2°) and EP 2.9.3 (radial runout < 0.5 mm). All temperature sensors are NIST-traceable PT100 elements with documented calibration certificates. The system has been historically deployed in QC laboratories operating under ISO/IEC 17025, GLP, and GMP frameworks. Full compliance documentation—including IQ/OQ protocols, preventive maintenance logs, and calibration records—is available upon request for qualified buyers.

Software & Data Management

The Agilent Dissolution Workstation software (v3.x or later) provides comprehensive method programming, real-time monitoring, automated reporting, and secure data archiving. It supports scheduled start-up, dynamic sampling sequence definition, and integration with UV-Vis spectrophotometers or HPLC systems via RS-232 or Ethernet. Audit trail functionality records all user actions—including parameter changes, method execution, and alarm acknowledgments—with immutable timestamps. Electronic signatures, role-based access control, and encrypted database storage fulfill FDA 21 CFR Part 11 requirements. Raw data files are stored in vendor-neutral .csv and .xml formats, enabling third-party statistical analysis and long-term archival in LIMS environments.

Applications

• Quality control release testing of solid oral dosage forms per pharmacopoeial monographs.
• Formulation development studies—including comparative dissolution profiling (f2 similarity factor analysis) and biowaiver support.
• Stability-indicating dissolution method validation under ICH Q5A and Q5C guidelines.
• Investigation of pH-dependent release kinetics using sequential buffer exchange protocols.
• Support for bioequivalence studies requiring high-precision, multi-timepoint sampling under controlled thermal conditions.
• Integration into automated dissolution–UV/HPLC workflows for real-time concentration quantification without manual sample handling.

FAQ

Is this unit supplied with original Agilent documentation and calibration records?
Yes—each unit includes its historical OQ/IQ summary report, temperature probe calibration certificates (traceable to NIST), and mechanical verification logs.
Can the VK7025 be upgraded to support USP Apparatus 3 (reciprocating cylinder) or Apparatus 4 (flow-through cell)?
No—the VK7025 is mechanically configured exclusively for Apparatus 1 and 2. For Apparatus 3 or 4, Agilent’s VK8000 series or Bio-Dis platforms are recommended.
What is the status of firmware and software support for this second-hand instrument?
The unit ships with firmware v4.2 and Dissolution Workstation v3.5. Agilent no longer provides active updates for this legacy platform, but validated backup images and installation media are included.
Does the system include a water bath chiller/heater?
No—the VK7025 requires an external recirculating chiller/heater (e.g., Huber CC-206 or similar) connected via standard ½” quick-connect fittings.
Are spare parts and service support still available?
Yes—critical consumables (vessels, baskets, paddles, lids, gaskets) remain in stock through Agilent’s legacy parts program; certified field engineers provide on-site PM and troubleshooting under separate service agreement.