Bureau of Drug and Narcotic
Mechanical Calibration
Temperature control
Calibrated thermometer
37 + 0.5 ˚C
Distance between the inside bottom of the vessel
and the bottom of the basket or paddle is maintained
at 25 + 2 mm during the test use a spacing gauge or ball
USP Performance Verification Test (PVT)
Bureau of Drug and Narcotic
• Provide experimental proof that the dissolution test
assembly is suitable for dissolution testing
• Confirms the acceptable operation of the equipment
• The result must conform to range given in the
certificate for the specification lot of reference material.
• PVT is a prerequisite for a proper performance
qualification of the dissolution assembly.
Bureau of Drug and Narcotic
Reference Standards for PVT
Always use the current lot
Follow the instructions on the label concerning storage and handling
Bureau of Drug and Narcotic
Prednisone USP RS
Check
• Current lot • Validity
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Prednisone USP RS
Certificate
Label
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Prednisone Tablets RS
Check
• Current lot • Validity
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Prednisone Tablets RS
Certificate & Label
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Prednisone Tablets RS
Store in a dry place.
Store at controlled room temperature Not exceeding 25 ºC
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Prednisone Tablets RS
Certificate
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Prednisone Tablets RS
Dissolution medium:
- Water: DI
- Preparing the medium “Deaeration”
USP Deaeration Technique - Heat water
while stirring gently
to about 41 – 45 C
-Filter under vacuum
through 0.45 um
porosity filter into
a filtering flask with
a stirring device
-Seal the flask,
continue to apply vacuum
while stirring for 5 min
-Vacuum should be
< 100 mbar
-Temperature of medium not fall below 37 C
Bureau of Drug and Narcotic
Prednisone Tablets RS
Procedure:
499 g of deaerated water
(500 ml)
37 C
each apparatus at 50-rpm
30 minutes
uv at 242 nm
alcohol < 5% of total volume of standard solution (If used)
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Prednisone Tablets RS
• Single - Stage Test • Two – Stage Test
Result:
• GM • %CV
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Prednisone Tablets RS
Futility Factor
Bureau of Drug and Narcotic
• Deaerated water
• Weight and carefully introduce dissolution medium
to the vessel 499 ml (500 g)
• Allow media in each vessel to reach 37 + 0.5 ºC
and use immediately.
• Always handle tablets with
- gloves (not cotton)
- forceps or tweezers which will not scratch or
damage the surface of the tablets
• Examine all 6 tablets, do not use chipped, cracked or
Capped tablets
• No need to weigh Tablets RS beforehand
(Weight is for information and investigation purposes)
Steps for PVT
Bureau of Drug and Narcotic
• Prepare to drop tablets.
• For Apparatus 2 Paddle
- Drop tablets into non-rotating apparatus
- Tablets must settle to the bottom of the vessel
before rotation of the shaft begins.
• Record time
• Samples should remain at the bottom center of the vessel
• Visually inspect and record any unusual observations
• Withdraw sample at 30 minutes + 36 seconds (+2%)
and filter immediately
• Measure the amount of prednisone dissolved at
242 nm in comparison with a solution of known
concentration of USP Prednisone RS
• Calculation and conclusion
Steps for PVT
Bureau of Drug and Narcotic
www.usp.org
Search for
PVT calculation tool
Select “Begin using the tool”
PVT Calculation Toolkit
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PVT Calculation Toolkit
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PVT Calculation Toolkit
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PVT Calculation Toolkit
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PVT Calculation Toolkit
Bureau of Drug and Narcotic
PVT Calculation Toolkit
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PVT Calculation Toolkit
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PVT Calculation Toolkit
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Data of 6 vessels
with 3 decimals
PVT Calculation Toolkit
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Submit data
PVT Calculation Toolkit
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Result & Report
PVT Calculation Toolkit
Recommendations for PVT
Bureau of Drug and Narcotic
- Designated vessels and shaft for each position
in dissolution instrument
- Rigorous mechanical calibration
- Proper deaeration of dissolution medium
- Test should be started as soon as possible
after media deaeration
- Filter samples immediately after withdrawing samples from each vessel
Prednisone Tablets RS
Bureau of Drug and Narcotic
Tablet should be stored in original container,
according to description on label
Remove tablets from package immediately
prior to testing
Do not put tablet RS next to water bath
while waiting for bath to equilibrate
Avoid exposure to excess humidity
Prednisone Tablets RS will give low results
Do not dry Prednisone Tablets RS in an oven No need to weigh Tablets RS beforehand
Sources of factors influence dissolution
Bureau of Drug and Narcotic
• Laboratory environment
• Medium
• Filtration
•Quantitative method
Note: instrument and analyst are qualified
Vibration
Bureau of Drug and Narcotic
USP specification:
“ No part of the assembly, including the environment
in which the assembly is placed, contributes significant
motion, agitation, or vibration beyond that due to the
smoothly rotating stirring element.”
Source of vibration:
* Apparatus
- Tension or dirt on the drive chain or belt
- Worn parts
- Alignment of belt guide plates
- Surging of individual spindles
- Turbulence in the water bath
Laboratory Environment
Bureau of Drug and Narcotic
Has anything changed in the lab environment?
- New equipment added to the immediate area
- Other changes (e.g. construction)
Vibration transfer
- Be careful how many testers put on the same bench
- Is bench suitable?
- What else is on the bench or nearby?
shaker, mixer, centrifuge
- consider use of vibration damping pads
Medium
Bureau of Drug and Narcotic
Using deaerated media
- use immediately after deaeration
- transfer media carefully to minimize re-aeration
of the media
Air bubbles can attach to particles
- decreasing dissolution by reducing surface area
- Increasing dissolution by
# lifting and moving particles
# bubble clogging the meshes of the basket
and retaining particles in a zone of higher
shear stress compare to the vessel bottom
Filtration
Bureau of Drug and Narcotic
Removal of undissolved particles
i.e. drug or excipients in the sample solution
Filtration should occur concomitantly with or
immediately after sampling
Unfiltered sample can continue drug dissolution
before filtration
Use Individual, clean syringes and filters
for sampling each vessel, each time
Filtration
Bureau of Drug and Narcotic
Precautions:
- Prewetting may be necessary
- Adsorption of the drug onto the filter has to be
evaluated
- Chemical compatibility and extractable impurities
should be considered by the selection of
the proper (inert) filter material
- Important to perform filter check/validation
*** PVDF membrane filter is recommended for PVT
When to perform PVT ?
Bureau of Drug and Narcotic
Installation of new apparatus
Movement or relocation of apparatus
Equipment maintenance
- Adjustment of drive mechanism
- Replacement of drive belt
- Replacement of circulator
- Replacement of vessels, baskets, paddle etc
Routine test schedule
If only one apparatus, basket or paddle, is used,
then only that apparatus needs to be tested.
Bureau of Drug and Narcotic
Bangkok Chemart Ltd., Part.
www.bangkokchemart.com
02 720 9557 - 9
Where to buy USP RS ?
Bureau of Drug and Narcotic