Specification builder · Tier C
Dissolution tester for USP Apparatus 1 (basket) and 2 (paddle), 6+1 / 8 vessel, manual, semi-automated with autosampler, or fully automated with online UV
A dissolution tester measures how fast the drug comes out of a tablet or capsule by stirring it in warm medium (37 deg C) in 6 to 8 glass vessels and taking samples at set times. Pharma QC labs use it for batch release, drug testing labs use it to check pharmacopoeia compliance, and R&D labs use it to compare dissolution profiles of generics with the innovator. Systems range from simple manual units to semi-automated units with an autosampler and fully automated systems with online UV analysis.
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Standards this specification draws on
- USP <711> Dissolution Defines apparatus 1 and 2 dimensions, temperature 37 +/- 0.5 deg C, speed +/-4%, sampling zone and acceptance stages.
- USP <724> Drug Release Defines apparatus 5 and 6 for transdermal systems.
- USP <1092> The Dissolution Procedure: Development and Validation Guidance on media degassing, filters, sinkers and method validation.
- USP Performance Verification Test (Prednisone Tablets RS) Chemical check of apparatus performance recommended together with mechanical calibration.
- Ph. Eur. 2.9.3 / BP Appendix XII B European and British pharmacopoeia dissolution requirements, harmonised with USP.
- ASTM E2503 Standard practice for mechanical qualification of basket and paddle apparatus (wobble, verticality, centring, height, speed, temperature).
- FDA Guidance: Use of Mechanical Calibration of Dissolution Apparatus 1 and 2 - CGMP (2010) Sets tighter mechanical limits (e.g. centring within 1.0 mm, speed +/-2%) accepted as an alternative to PVT.
- USP <1058> Analytical Instrument Qualification Framework for IQ / OQ / PQ of the instrument.
- 21 CFR Part 11 / EU GMP Annex 11 / PIC/S PI 041 Electronic records, audit trail and data integrity expectations for GMP labs inspected by DRAP.
- IEC 61010-1 Electrical safety of laboratory equipment.
Common mistakes in tenders for this equipment
- Copying one brand's brochure: proprietary feature names (hollow shaft sampling, named locking vessel plates, shaft drive names, camera systems) or an exact speed range such as '10-250 rpm' that only one brand states.
- Writing only 'USP compliant' without requiring mechanical calibration of every position to FDA / ASTM E2503 limits at installation with certified tools - units then arrive uncalibrated or fail at the first audit.
- Accepting bath temperature accuracy (+/-0.1 deg C at the bath probe) as if it were vessel temperature; the requirement is 37.0 +/- 0.5 deg C inside each vessel.
- Accepting 'Part 11 ready' firmware that has no non-editable audit trail or electronic signature; ask for a compliance statement and test the audit trail during OQ.
- Forgetting spare vessels, baskets and filters; vessels are maker-specific and a broken vessel can stop testing for weeks.
- Awarding to an offer whose country of origin cannot currently be imported into Pakistan (Indian-origin equipment has faced trade restrictions since 2019), causing cancellation and re-tendering.
- Asking for DRAP medical device registration, which does not apply to laboratory dissolution testers and wrongly excludes valid bidders.
- Buying an autosampler without validating filter adsorption, line carry-over and sample volume replacement for each method.