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Dissolution Apparatus Operation and Calibration SOP

Last reviewed 16 Oct 2026 · 8 min read

Contents
  1. Objective
  2. Scope
  3. Responsibilities
  4. Equipment and materials
  5. Procedure
  6. Before operation
  7. Set up and run the approved method
  8. Calibration and apparatus suitability
  9. Controller settings
  10. Prednisone performance verification
  11. Maintenance, training, and records
  12. Abbreviations
  13. Related reading
  14. References

In short: This illustrative SOP template covers operation, equipment checks, and records for a dissolution test apparatus. Analysts must use the product-specific approved method and the current applicable pharmacopoeial text; the legacy values retained below are not default test conditions and need site review.

Objective

Describe a controlled way to set up, operate, check, and document a dissolution test apparatus when the approved product method calls for it. The actual apparatus, medium, volume, temperature, agitation rate, run time, sampling plan, and acceptance criteria must come from the current applicable monograph or approved method.

Scope

This example is for trained Quality Control staff using a USP Apparatus 1 (basket) or Apparatus 2 (paddle) system. Adapt it to the instrument model, approved methods, laboratory controls, and local quality system. Use a separate approved procedure for other apparatus types or automated configurations.

Responsibilities

  • The analyst checks the instrument status, selects the approved method, performs the test, and records contemporaneous observations and data.
  • The section supervisor reviews completed records and ensures that deviations or equipment issues are assessed.
  • The instrument owner maintains the approved calibration, qualification, and preventive-maintenance schedule and arranges qualified service when needed.
  • The Quality Control unit approves laboratory procedures, specifications, and changes as applicable. Under 21 CFR 211.160(a) and (b)(4), the procedure and calibration program must define controls and be documented; instruments outside established specifications must not be used. The eCFR text was current as of 14 October 2026.

Equipment and materials

Use the identified dissolution instrument, compatible vessels and shafts, the method-specified baskets or paddles, a suitable temperature-measuring device, and any approved sampling or analytical equipment. Use only the dissolution medium, reference material, filters, and analytical procedure specified by the current approved method.

Procedure

Before operation

  1. Confirm the instrument ID, status label, calibration or qualification due date, and any open maintenance restriction. Do not use equipment that is overdue or outside its approved status.
  2. Confirm that vessels, shafts, paddles or baskets, and covers are clean, dry where required, correctly identified, undamaged, and compatible with the method. Check that the apparatus is stable and that nearby equipment is not causing material vibration. FDA’s 2010 guidance identifies vibration, dissolved gases, and vessel dimensions as sources to control in dissolution testing.
  3. Check that the power connection matches the instrument nameplate and that the controller, timer, temperature display, and alarms function as described in the current manufacturer’s manual. Do not infer method conditions from a controller menu.
  4. Verify the current product method and worksheet before programming. Record the method version, apparatus type, medium preparation, volume, target temperature, agitation rate, run duration, sampling times, and analytical method required by that document.

Example in-house criterion (not a pharmacopoeial requirement): before each use, the analyst records an inspection of the vessel and stirring components and confirms that no visible damage, looseness, abnormal noise, or status restriction is present. The site should define the form and escalation path in its own quality system.

Set up and run the approved method

  1. Assemble the instrument as specified by its current manual. Install the correct vessels, shafts, paddles or baskets, and covers. Confirm that the components are centered and do not contact the vessel during rotation.
  2. Prepare and add the dissolution medium as instructed in the approved method. Allow the medium and apparatus to reach the specified test condition. Use the method’s medium preparation and deaeration instructions; do not substitute a generic medium, volume, temperature, or deaeration step.
  3. Set the specified apparatus, agitation rate, temperature, duration, and sampling sequence. Have a second-person check where the site’s approved procedure requires it. Start the run using the instrument manufacturer’s instructions and record the actual start time and any alarm or interruption.
  4. Introduce each dosage unit and collect samples at the times and positions required by the approved method. For Apparatus 1 and 2 the general procedure in USP <711> withdraws the specimen from a zone midway between the surface of the dissolution medium and the top of the rotating basket or blade, not less than 1 cm from the vessel wall. This is the general-chapter position, so the product monograph or approved method governs if it specifies otherwise; do not move the sampling point without a documented, justified method change.
  5. Filter, replace medium, dilute, and analyse samples only as directed by the approved method. Record sample identity, collection time, volume, any medium replacement, and the analytical result in the controlled record.
  6. At completion, stop the instrument as instructed by the manufacturer. Clean vessels and stirring components using the approved cleaning procedure, dry or store them as specified, and record use or cleaning in the applicable log.

Calibration and apparatus suitability

A written, approved program should identify the approach used, parameters to be controlled, acceptance limits, schedule, records, and actions when a limit is not met. Current 21 CFR 211.160(b)(4) requires calibration of laboratory instruments and apparatus at suitable intervals under an established written program. FDA’s Guidance for Industry, The Use of Mechanical Calibration of Dissolution Apparatus 1 and 2 (January 2010), describes enhanced mechanical calibration as an alternative to the Apparatus Suitability procedure in USP <711>; it does not make both approaches a universal requirement. Select and document the approach applicable to the site’s regulatory commitments and current compendial method.

For a USP method, follow the applicable current USP-NF General Chapter <711>, Dissolution. USP identifies the Performance Verification Test (PVT) as part of <711>; its current FAQ says apparatus suitability is performed periodically without a fixed period in the chapter. The current official chapter and reference-standard instructions take precedence over historic copies or an instrument supplier’s generic limits.

Example in-house criterion (not a pharmacopoeial requirement): the source draft proposed physical checks monthly and a chemical performance check every six months. These are local frequencies only if the site’s approved risk-based program adopts them; they are not presented here as universal pharmacopoeial intervals.

The values below come from the old source draft. They are example in-house criteria (not a pharmacopoeial requirement) and are not USP <711> limits. For the pharmacopoeial requirements on dimensions, speed, temperature and tolerances, follow the current USP <711> (and the current FDA 2010 mechanical calibration guidance if that approach is used). A site procedure should identify the equipment, calibrated measurement tools, measurement locations, acceptance limits, and corrective action for each check.

The source draft additionally lists shaft-to-vessel alignment, head/base plate levelness, and basket mesh integrity as checks. It does not give a verified method or acceptance limit for every item.

Check in source draftExample in-house criterion (not a pharmacopoeial requirement)
Rotational speed50 rpm: 48–52 rpm; 100 rpm: 96–104 rpm; 125 rpm: 120–130 rpm
TemperatureSet display to 37°C; reported vessel range 36–37.5°C
Timer30 min: 29 min 24 sec–30 min 36 sec; 60 min: 58 min 48 sec–61 min 12 sec
Shaft/paddle or basket wobbleCheck at 50 and 100 rpm; paddle limit 0.5 mm and basket limit 1 mm
Stirrer-to-vessel bottom distance25 ± 2 mm; source gives a 0.4 mm paddle correction factor
Basket mesh40 openings per linear inch
Assembly coverageDefine in the site procedure which shafts, paddles and baskets are checked for speed, wobble and integrity, matching the actual configuration of the instrument (the old draft gave inconsistent counts)

Controller settings

Controllers differ by manufacturer and model. Follow the manufacturer’s manual and the site’s approved procedure for supply, program entry and setting ranges. Program the test conditions only from the approved method, never from the controller’s available screen ranges.

Prednisone performance verification

The source draft describes a prednisone tablet check as a “calibration.” USP <711> describes apparatus suitability/performance verification rather than treating reference tablets as a stand-alone calibration. USP’s current USP-NF preview identifies the chapter as General Chapter <711>, Dissolution (2023); USP’s PVT information states that the revised PVT standard became official on 1 May 2023. If the site uses USP PVT, use the currently official USP Dissolution Performance Verification Standard—Prednisone RS, the complete current chapter procedure, and the official acceptance range for the current lot.

Do not reproduce the old draft’s prednisone method conditions in a site SOP. Take the procedure (apparatus, medium and its preparation, speed, time, standard and sample preparation, wavelength and any permitted solvent) from the current official USP <711> and the instructions supplied with the current lot of the USP Dissolution Performance Verification Standard - Prednisone RS. Compare the result with the acceptance range stated for that lot; the range is lot-specific and is not given here.

Maintenance, training, and records

Follow the manufacturer’s manual and the site’s approved procedure for water-bath changes, lubrication, jam clearing, adjustment, component replacement and service. Do not lubricate or adjust any part unless the manual specifies the material and method.

Example in-house criterion (not a pharmacopoeial requirement): change bath water on a defined schedule or whenever it is turbid, inspect baskets and paddles before each use, and remove damaged or bent components from service. The site sets the interval in its own plan.

Example in-house criterion (not a pharmacopoeial requirement): authorize analysts for the specific instrument and record training before independent operation. Maintain instrument-use, calibration or PVT, maintenance, cleaning, deviation, and raw-data records in controlled systems. For batch-associated records, retain them at least 1 year after expiry of the respective product batch. EU GMP Part I Chapter 4 §4.11 (Revision 1, 2011) requires batch documentation for 1 year after expiry or 5 years after Qualified Person certification, whichever is longer; 21 CFR 211.180(a), eCFR current as of 14 October 2026, specifies at least 1 year after batch expiry for covered batch-associated records. Apply any longer period required by local law or the marketing authorisation.

Abbreviations

  • AC: alternating current
  • FDA: Food and Drug Administration
  • PVT: Performance Verification Test
  • QC: Quality Control
  • RS: Reference Standard
  • USP: United States Pharmacopeia

See also: SOP for operation and calibration of a disintegration tester, SOP for laboratory instrument maintenance, and QC laboratory records maintenance.

References

  1. U.S. Food and Drug Administration. The Use of Mechanical Calibration of Dissolution Apparatus 1 and 2—Current Good Manufacturing Practice (CGMP), Guidance for Industry, January 2010. Official guidance.
  2. United States Pharmacopeia. General Chapter <711>, Dissolution, USP-NF (2023 edition; official USP public preview). Official chapter page.
  3. United States Pharmacopeia. FAQs: Dissolution Performance Verification Testing (PVT), current USP information for revised <711> (accessed 16 October 2026). Official FAQ.
  4. Electronic Code of Federal Regulations. 21 CFR 211.160(a), (b)(4), General requirements, Title 21 current as of 14 October 2026. Current section.
  5. European Commission. EudraLex Volume 4, EU Guidelines for Good Manufacturing Practice, Part I, Chapter 4, Documentation, Revision 1 (effective 30 June 2011), §4.11. Official chapter PDF.
  6. Electronic Code of Federal Regulations. 21 CFR 211.180(a), General requirements, Title 21 current as of 14 October 2026. Current section.

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