Calibration of Dissolution Tester - Ministry of Public...
Transcript of Calibration of Dissolution Tester - Ministry of Public...
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Dissolution TesterTester
GMP 4th
Soraya HengsawasBureau of Drug and Narcotic
Department of Medical Sciences
August 23rd, 2006
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Topics
Dissolution TestingCalibration of Dissolution Tester
- Physical Parameters- USP Tablet Calibrators
Maintenance
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What is Tablet Dissolution?
Tablet Dissolution is a standardized method for measuring the rate of drug release from a dosage form.
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Dissolution TestingThe principle function of dissolution test may be summarized as follows:
Optimization of the therapeutic effectiveness during product development and stability assessment.Routine assessment of production quality to ensure uniformity between production lots.Assessment of ‘bioequivalence’.Prediction of ‘in-vivo’ availability i.e. bioavailability (where applicable)
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Definition of the Dissolution Rate
dw = kS (Csat-Csol) [1]dt
wheredw = the dissolution ratedtk = a dissolution constantS = the surface area of the solidCsat = the concentration of a saturated solutionCsol = the concentration at any given time
dw = KS [2]dt
Sink condition; Csat >> Csol
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The dissolution procedure requires
ApparatusDissolution Medium(composition and amount)Test ConditionsAcceptance Criteria
Dissolution Testing
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Dissolution ApparatusBP2005
Apparatus USP29 Solid Dosage Forms
(Apparatus)
TransdermalPatches
(Method)I Basket Basket
PaddleFlow-Through
Cell-
--
Disk assembly (SSDA)
II Paddle Extraction CellIII Reciprocating
CylinderRotating Cylinder
IV Flow-Through Cell
-
V Paddle over Disk -VI Cylinder -VII Reciprocating
Holder- -
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Typical media for dissolution may include the following :
WaterDiluted HClBuffers in physiological pH range (pH 1.2-7.5)Simulated gastric or intestinal fluid (with or without enzymes)Surfactants (with or without acids or buffers) such as - polysorbate 80
- sodium lauryl sulfate- bile salts
Dissolution Medium
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Before the test, the operator must check the calibration datebath water level temperature (bath and vessels) distance of the apparatus from bottom of vessel rotating speed (RPM)timesampling position of the sampling probeautomated sampling system
Dissolution Tester
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Calibration of Dissolution TesterPhysical Parameters
Shaft Rotating SpeedWobbleTemperatureShaft AlignmentInstrument LevelVibrationShaft Centering
USP Tablet Calibrators
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Calibration Instrumentation for Dissolution Tester ((QA Station II)
Temperature probe
Adapter (EaseAlign)
Setup station
Vibration sensor
Electronic level sensorMagnetic clip
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Shaft Rotating Speed (RPM check) Shaft Rotating Speed (RPM check)
Tachometer sensor
Magnetic clip
Max. allowable : ±4%
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Wobble Gauge with Basket (Shaft)
Wobble gaugeMax. allowable : < 1 mm
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Wobble Gauge with Basket (Basket Rim)
Basket Rim
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Wobble gauge
Wobble Gauge with Paddle
Max. allowable : < 1 mm
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Temperature Test (Bath)
Temperature probe
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Temperature Test (Vessel)
Max. allowable : ± 0.5 °C
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Shaft AlignmentElectronic level sensor
Max. allowable : ± 1.5 °
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Vessel Table Level
Electronic level sensor
Max. allowable : ± 0.5 °
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Vibration
Sources of Vibration
External:
ex. centrifuges, double-beam spectrophotometers, pumps, fume hoods, fan, air conditioner etc.
Internal:
ex. circulator for the water bath, motor
4 parameters:
Acceleration (g)
Frequency (Hz)
Velocity (mm/s)
Displacement (mm)
Max. allowable :
Displacement-Z ≤ 0.1 mils (0.00254 mm)
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Shaft Centeringis dependent on two parameters:
The position of the spindle (factory set)
The position of the vesselsMax. allowable : ± 2 mm
Centering ring
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Printout
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Random Input Variables ChecklistVariable Maximum
allowableExcess
Commonly Seen
Effect of Excess
Methods of Control
1. Eccentricity,Wobble, Tilt
± 1 mm 2-5 mm + 4%-8% straighten shafts, use wide shaft-guide points
2. Vibration 0.1 mil 0.2-0.9 mils + 5%-10% eliminate source
3. ShaftAlignment
1.5° to perpendicular
2° -7° + 2%-25% adjust alignment in field
4. Shaft Centering
± 2 mm
(compendium)
± 2-6 mm ± 2%-13% center individual vessels
5. Agitation Rate, Rotating Speed (RPM)
± 4% ± 10% linear use better, smoother control or use synchronous drive
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Variable Maximum allowable
Excess Commonly
Seen
Effect of Excess
Methods of Control
6. Dissolved gas
deaerated bubble form ± 50% deaerate media
7. Media pH accuracy ± 0.05 ± 10% check buffers or deaerate, calibrate the pH meter
8. Media contamination
ppm ion, surfactants
substantial carefully control media
9. Evaporation none 2%-5% linear use vessel covers
10.Temperature ± 0.5 °C 1 °C-2 °C linear monitor individual vessels, allow adequate equilibrium
Random Input Variables Checklist (cont.)
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Random Input Variables Checklist (cont.)
Variable Maximum allowable
Excess Commonly
Seen
Effect of Excess
Methods of Control
11. Flow pattern
no interference
turbulence from probes
substantial remove probes
12. Sampling position
compendium ± 0.5 cm little use care
13. Filters no sorbing considerable blockage
significant check sorbing
14. Detection use standard interference considerable use standard
15. Sorbing none considerable significant check materials
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Calibration of Dissolution TesterPhysical ParametersUSP Tablet Calibrators
USP Prednisone Tablets RS(Dissolution Calibrator; Disintegrating)
USP Salicylic Acid Tablets RS(Dissolution Calibrator; Nondisintegrating)
USP Chlorpheniramine Maleate Extended-Release Tablets RS (Drug Release Calibrator; Single Unit)
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Tablet CalibratorsUSP Tablet Calibrators
Item Prednisone(Lot O0C056)
Salicylic acid (Lot Q0D200)
Type Disintegrating NondisintegratingAmount 10 mg/tab 300 mg/tab
Test for Apparatus I and II I and II
RPM 50 100Dissolution Medium
Deaerated Water, 500 ml
Deaerated 0.05 M Phosphate Buffer
pH 7.4 ± 0.05, 900 ml Time point 30 minutes 30 minutes
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Tablet Calibrators (cont.)
USP Tablet Calibrators Item Prednisone
(Lot O0C056)Salicylic acid (Lot Q0D200)
Max. λ (nm) 242 296
Packaging Plastic bottle Blister pack
% alcohol in Std. solution
≤ 5 % ≤ 1 %
Acceptance values (%la.)Apparatus IApparatus II
51-8126-47
23-3017-25
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USP Tablet Calibrators
Prednisone Tablet
Salicylic acid Tablet
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Tablet CalibrationStudy the COA of the USP tablet calibrators
Setup the dissolution tester
Prepare deaerated dissolution medium
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Tablet Calibration (cont.)Pour the dissolution medium into the vessels and
equilibrate to 37 °C, use immediately (Check and record the temperature of each vessels)
Weigh each tablet calibrators
Insert the tablet calibrators into the baskets/Drop the tablet calibrators into the vessels
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Tablet Calibration (cont.)Activate the spindles at the desired speed
Withdraw the specimens at the stated time and immediately filter
Recheck and record the temperature of the vessels
Measure the absorbance of samples and standard solutions
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Notes
Standing in air of deaerated mediaform a natural equilibrium over a period of time
a portion of the gas is dissolved in the liquid
Storage the tablet calibrators in the original package
Ensure that no sample absorption onto the filter
Sampling probe that enter the media only during sampling in order to avoid flow disturbances
Carefully sampling the specimens
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Notes (cont.)Automated sampling system should be calibrated parallel with manual analysis
It may be useful to weigh the tablet calibrators before and after a run to answer the failure of the test
Visual observations are often helpful for understanding the source of the variability
Air bubbles can interfere with the test results, especially air pocket inside the basket may lower the dissolution rate of salicylic acid tablet by much as 50%
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“ There are many reasons that a tablet calibration test may fail. The items in the checklist may or may not the reason for a failed test. Deaeration and vibration are two of the largest contributors to failure.”
Tablet Calibration
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Influence of Release GasesThe bubbles that appear in media as the equilibrium is disturbed may
- buoyancy dissolution rate
- available surface area dissolution rate
- associate with aggregate particles random concentrations of the particles in the solvent stream
- collect at the screen on the basket changing the effective porosity of the mesh
- cling the particle to the apparatus and vessel walls- influence on pH of the media
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Deaeration Methods
Helium flushingSonicating + VacuumAutomated media degasser (ex. DosaPrep®)Warming to 41 °C + filtering + Vacuum
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Deaeration Methods (cont.)
Method% Reduction in dissolved
oxygen (approximate)
USP23 (heating to 45 °C plus filtration and vacuum)
85 + 11%
Filtering only at room temperature
65 + 3%
Boiling (heating to 100 °C) 50 + 3%
Ultrasound and vacuum degassing
95 + 2%0
20
40
60
80
100
USP23 Filtering only at roomtemperature
Boiling Ultrasound and vacuumdegassing
Method
%Reduction
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Deaeration Method (USP29)
Heat the medium, stirring gently, to approximately 41 °C
Immediately filter through 0.45 μm or less filter, under vacuum with vigorous stirring
Continue stirring under vacuum for 5 additional minutes
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Deaeration Method (USP29) (cont.)
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Deaeration Method (USP29) (cont.)
Carefully transfer the medium into the container with tightly closure until full
Allow to cool and measure 500 or 900 ml (or whatever the method calls for) volumetrically
Gently pour medium into the dissolution vesseland equilibrate to 37 °C, use immediately
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Maintenance
Careful cleaning is required to ensure there is no contamination between tests. Handling the basket and shaft/ paddles with care Visually inspect the bath water weekly for algae or other foreign material. Water in the bath is reasonable clean to ensure that the circulating pump is also clean. Do not allow dissolution media sit on the system. Clean up dissolution media whenever it is spilled on the system.
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Maintenance Schedule
Frequency ProcedureAfter each test Clean up system
Weekly Inspect :- circulating water pump
- bath waterMonthly Replace bath water
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Maintenance Schedule (cont.)Frequency ProcedureEvery 6 months - Check temperature
calibration- Calibration the system- Inspect guide rods and spindle bearings
Annually Inspect :- belts- Idler pulleys
Every 2 years Replace belts
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Causes of VariablesFormulation and Manufacturing ProcessExample :
- poor content uniformity- process inconsistencies- a reaction taking place at different rates during dissolution
- excipient interactions or interference- film coating - capsule shell aging- hardening or softening of the dosage form on stability
Routine testing of the product- analytical- formulation- processing perspectives
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