dissolution tools for api characterization. -...
TRANSCRIPT
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Dissolution Tools
for API
Characterization.
Tablet Compression Workshop
25 - 26 January 2017 | Department of OrganicTechnology, UTC
Iva Martincová | [email protected]
Petr Zámostný | [email protected]
Samir Haddouchi | [email protected]
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SOTAX Group
SPS Pharma Services
CRO offering all analytical services (founded in 2005)
The only company in the world specialized in R&D for
dissolution and release testing
Located in Orleans, France
Facility fully cGMP-compliant, US FDA-inspected,
regularly subject to audits
Key Portfolio:
R&D Services
Routine Analytical Services (GMP)
Support Services
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Privately owned, independent, globally active
Corporate headquarter in Switzerland with a strong presence in
Asia and the America
Direct sales channels / own subsidiaries with distributor channel
SPS Pharma – 2005
Zymark – 2008
Pharma Dr. Schleuniger - 2013 Since 1973.
SOTAX Group
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies: Paracetamol
Case Studies: IR Tablets
Conclusion
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Introduction on Dissolution.
Time
Pla
sm
a C
on
ce
ntr
atio
n
Cmax
Tmax
AUC
Adapted from Prof. Cardot & Prof. Beyssac
(Université d’Auvergne)
Release
Absorption
Distribution
Metabolisation
Elimination
Effect
Dosage
form
API
released
API
dissolved
API
absorbed
Distribution
Elimination
Efficacy
Safety
API in
blood
API in
tissues
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Introduction on Dissolution.
dW/dt = dissolution rate
D = diffusion coefficient
h = thickness of the stagnant layer surrounding the dissolving particle
S = the surface area of the solid
Cs = the concentration of a saturated solution
Cb = the concentration at any given time of the bulk solution
)CS(Ch
D
dt
dWbs
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Introduction on Dissolution –USP 1, 2 ,4
USP 1: Rotating Basket
Temperature inside the vessel
at 37 ± 0.5 °C
Shaft with a cylindrical basket
Problem with homogeneity of mixing
Difficulty to monitor the dosage form
Problem of corrosion
Problem of polymers/gelatin and mesh
Bubbles on the mesh (degassing)
Cleaning process may be tedious
Sensitivity to environmental conditions
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Introduction on Dissolution –USP 1, 2, 4
USP 2: Rotating Paddle
Temperature inside the vessel at 37 ± 0.5 °C
Shaft with a paddle placed at 25 mm from bottom
Problem with light formulation
Use of sinkers
Insoluble excipients
Coning effect
Sensitivity to environmental conditions
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Introduction on Dissolution –USP 1, 2, 4
USP 4: Flow-Through Cell
Flexibility:
from very small volumes to infinite
Monitoring the release and not the
dissolution properties
Allowing control of the dosage form
positioning
No sensitivity to environmental
conditions
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USP 4 - Dosage Form Challenges
• MR, CR, SR and ER tablets
• pH change• Poorly soluble
• API’s• Powders• Granules
• Low dose• Hydrodynamic
control
• Capsules• Pellets
• Floating• Capsule
interference
• Medical devices• Drug-eluting beads
& stents• Implants• Coated ocular
implants & lenses
• Low dose
• Suppositories• Soft-gelatin
capsules
• Lipid interference
• Parenterals• Emulsions• Suspensions• Microspheres• Semi-solids
• Low dose• Small particles• Dialysis often
required
CHA
LLE
NG
ED
OS
AG
E
FO
RM
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USP 4 - Specific cells for all dosage forms
small tablets large tablets different adapters for semi-solids, contact
lenses, dialysis bags, etc.
powder suppositories implants large stents small stents or products with
adsorption problems
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Introduction on Dissolution.
Importance of all steps in a dissolution test interpretation
Disintegration cohesive properties of the formulation
Release type and proportion of excipients
Dissolution of the drug API characteristics
Dosage
Form
Disinte-
grationRelease
Dissolu-
tion
Dissolved
Drug
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies: Paracetamol
Case Studies: IR Tablets
Conclusion
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Intrinsic Dissolution. (1)
)CS(Ch
D
dt
dWtsat
Eur. Ph. § 2.9.29
USP <1087>
The intrinsic dissolution rate is the rate of dissolution of pure pharmaceutical ingredients
when conditions such as volume, agitation, pH and ionic strength of the dissolution medium
and surface area are held constant .
Physical properties’ effects are minimized or eliminated.
Determination of the constant k
Use of a tablet of pure drug
Expressed as mg/min/cm2
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Intrinsic Dissolution. (2)
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Intrinsic Dissolution. (3)
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Intrinsic Dissolution. (4)
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Intrinsic Dissolution. (5)
y = 0.275x - 0.2133R² = 0.9998
0
2
4
6
8
10
12
14
16
18
20
0 10 20 30 40 50 60
Am
ou
nt
dis
so
lve
d(m
g/c
m2)
Time (min)
18
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Intrinsic Dissolution: Comparison.
0
5
10
15
20
25
0 10 20 30 40 50 60 70 80 90
Am
ou
nt
dis
so
lve
d(m
g/c
m2)
Time (min)
19
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies: Paracetamol
Case Studies: IR Tablets
Conclusion
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Apparent Dissolution. (1)
When applied to powders, dissolution studies allow:
To optimize formulation variables, including particle size.
To compare batches of active ingredient having different
physical properties:
Surface area and particle size distribution.
The comparison of various polymorphic forms of drug substances
can show identical or very different biopharmaceutical properties.
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The Flow-Through Cell.
The test sample is located in a small
volume cell through which solvent passes
The eluate is filtered upon leaving the cell
The eluate is analyzed directly (on-line)
with a spectrophotometer and/or collected
in a fraction collector (off-line)
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Open System with pH Change.
Cell
Pump
Waste
Fraction Collection
Splitter
Media
Selector
C
t
differential
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Closed Loop System.
Cell
Pump
Magnetic
stirrer
UV-Vis
Photometer
Fraction
Collection
C
t
cumulative
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Why Choose USP 4?
USP 4 is the method of choice for poorly soluble compounds in order to maintain sink conditions
USP 4 is a method for low volume dissolution media
Specific cells for special / novel dosage forms are available
Automated pH changes can be easily achieved for IVIVC studies
Solves many challenges of USP 2 such as floating or sticking products, and inherent sampling issues
USP 4 method is increasingly used for measuring API characterization (apparent dissolution in Eur. Ph. § 2.9.43)
USP 4 is a recomended method for injectable suspensions
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Powder cell for apparent dissolution can also be used for pellets and granules.
Dissolution results depend on physical properties of powder.
Advantages:
No floating, no sticking
Powder / API is not
compressed
Powder is wet
immediately
APIs: Apparent Dissolution
3-stage filtration
Dispersion disk(sieve + blocker)
Sieves + filter to support powder
Mobile sieve (450 µm)
Fixed sieve (450 µm)
Filter (2.7 µm)
Fixed sieve (450 µm)
Fixed sieve (450 µm)
Filter (2.7 µm)
Fixed sieve (450 µm)
Fixed sieve (450 µm)
Pre-filter (2.7 µm)
Filter (0.7 µm)
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Apparent Dissolution. (2)
Eur. Ph. § 2.9.43
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Apparent Dissolution. (3)
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies 1: VSCHT – Effect of maize starch
properties on drug dissolution rate
Case Studies 2: VSCHT – Doc. Zámostný - Dissolution
Rate of Agglomerates, QbD Approach To formulation
Conclusion
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Effect of maize
starch properties
on drug
dissolution rate
Case study 1
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Aim of the work
„Pregelatinized maize starch contributes to retardation of both soluble and slightly
soluble drugs compared to microcrystalline cellulose or spray-dried lactose“Levina M, Rajabi-Siahboomi AR. The influence of excipients on drug release from hydroxypropyl methylcellulose matrices. J
Pharm Sci 2004;93:2746-54.
„Different cross-linking in starch samples causes substantial differences in release“Onofre F, Wang Y-J, Mauromoustakos A. Effects of structure and modification on sustained release properties of starches.
Carbohydr Polym 2009;76:541-7.
Our objective
compare API release from different starch matrices
describe release rate by mathematical model
correlate release parameters to functional properties
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Experimental
5 different pregelatinized starch samples (courtesy of Zentiva company)
Characterization
SEM, XRD, DSC, PM
functional characteristics
Preparation of API/starch mixtures 1 : 4
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SEM images of maize starch
Pregelatinized Native
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Starch ID A B C D E
V/V0 4.9 4.4 5.7 8.1 7.7
wH2O, % 8 8 8 7 7
wdis,20°C, % 10.3 6.4 10.9 8.9 6.8
wdis,35°C, % 12.2 13.4 13.5 10.6 8.0
Maize starch functional properties
0 5 10
A
B
C
D
E
V/V0
0 5 10 15
A
B
C
D
E
wdis,35°C, %
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Apparent intrinsic dissolution
Fill mixture
to
dissolution
die
Compress
a compact
in die and
place in
IDR
time
amount
released
Apparent IDR
IDR
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Dissolution results
0,0
0,2
0,1
c, g.l-1
0 6030 t, min
111
1
11
1
1
1
1
1
1
1
1
11
11
1
2
22
22
2
2
2
2
2
2
2
2
2
2
2
2
2
2
333
33
3
3
3
3
3
3
3
3
3
3
33
33
0,0
0,2
0,1
c, g.l-1
0 6030 t, min
API1 API2
Cumulative dissolution profiles of caffeine released from caffeine-starch matrix comprising different
pregelatinized maize starch samples (A, B, C, D, E) measured in standard IDR apparatus (900 ml
0,1M HCl, 50 rpm)
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Mathematical model
Noyes-Whitney
„Sink“ conditions + resistance
due to swollen layer
Swollen layer thickness
ef API,API
HL
*
APIAPI 1
d
d
DD
V
wAc
t
c
API
*
API ccKAr
HL
ST*
STST
ef CAF,CAF
HL*
CAFCAF
11
d
d
Dc
DD
ct
caffeine leaching starch
matrix
decay
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Regression results - caffeine
0,0
0,2
0,1
c, g.l-1
0 6030 t, min
API1
Starch ID A B C D E
DAPI,
cm2.s−14.20 × 10−6
Def/DAPI180 181 135 30 25
RST,dis, cm.s-
1 (×103)0.09 0.61 < 0.01 1.38 1.34
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Correlation analysis
0
100
200
3 5 7 9
Def/DCAFF
V/V0
0
1
2
7 11 15
RST, dis
cm2.s-1
wdis,(35 °C), %
0
100
200
4,0 5,0 6,0
Def/DCAFF
V/V00
1
11,0 15,0
RST, dis
cm2.s-1
wdis,(35 °C), %
API1
API2
starch, used in drug formulations, can significantly alter the active ingredient release profile
different maize starches within the pharmacopeial requirements can exhibit substantial differences in their effect on drug dissolution
retardation effect of starch on the release rate is determined
by the effective diffusivity of active ingredient within the swollen starch layer
by the rate of starch layer decay
effective diffusivity – strong function of swelling capacity
starch matrix decay
not simple function of starch solubility
can depend on API/mixture properties
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies 1: VSCHT – Doc. Zámostný-Effect of maize
starch properties on drug dissolution rate
Case Studies 2: VSCHT – Doc. Zámostný - Dissolution
Rate of Agglomerates, QbD Approach To formulation
Conclusion
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Dissolution Rate
of Agglomerates
- QbD Approach
To formulation
Case study 2
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Aim of the work
The overall rate of the API release depends on arrangement and interactions of
APIs and excipients in dosage forms
Affected by dosage form processing history
Evaluate the API release rate from granules prepared by different granulation
methods and understand the effects
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Setup
Powdered API
API/excipients granulated by wet-granulation
Compacted API/excipients
Fractions of particle size 75 – 125 μm and 425 – 1000 μm
Dissolution test:
USP 4: 0.1N HCl, 37 °C, open-loop arrangement
Dissolution cell for powders and granulate
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Release rate from different agglomerates
powdered API (black)
wet granulate (green)
dry granulate (red)
425 – 1000 μm (filled
markers)
75-125 μm (empty
markers)
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Release rate from different agglomerates
S
HL
CAD
dt
dm
Noyes-WhitneyResistance to
diffusion- binder
Adsorption- MCC
Wetting
m
m
mK
mKk
D
dd
D
CA
dt
dm
Ads
Ads
Ads
ef
ppHL
s
11
2
0
The data analysis allows us to determine the cause of possible
dissolution problems at the design stage
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Dissolution Tools for API
Characterization.
Introduction on Dissolution
API Characterization
Intrinsic Dissolution Rate
Apparent Dissolution
Case Studies 1: VSCHT – Doc. Zámostný - Effect of
maize starch properties on drug dissolution rate
Case Studies 2: VSCHT – Doc. Zámostný - Dissolution
Rate of Agglomerates, QbD Approach To formulation
Conclusion
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Take-home Message.
API biopharmaceutical characterization may be considered as time consuming but…
In-vitro testing is not expensive compared to in-vivo studies.
It can guide and facilitate formulation development.
These are good tools to de-risk biostudies.
Different approaches can be used:
XRPD, DSC, particle morphology
Intrinsic / apparent dissolution
Evaluation of different dissolution methods than USP 1 & 2
Use of different pHs / media
Finally, development time can be shortened.
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Thank you for cooperation.
Petr Zámostný, VSCHT
Samir Haddouchi, SPS Pharma
www.vscht.cz
www.sotax.com
www.sps-pharma.com