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VVaalliiddaattiioonn ooff TTaabblleettttiinngg 
PPrroocceessss 
DDrr.. LL .. PPrraabbaakkaarraann 
PPrrooff.. && HHeeaadd 
RR.. RR.. CCoolllleeggee ooff PPhhaarrmmaaccyy 
BBaannggaalloorree --9900..
Some Common Variables In The 
Manufacture Of Tablet Products 
Particle size of drug substance Milling conditions 
Bulk density of drug substance/excipients Lubricant blending 
times 
Powder load in granulator Tablet hardness 
Amount and concentration of binder Coating solution 
spray rate 
Mixer speed and mixing times 
Granulation moisture content
TThheeoorryy –– PPoowwddeerr BBlleennddiinngg 
TThhee mmiixxeerr iiss uusseedd ttoo pprroodduuccee pprroodduucctt iinn wwhhiicchh eexxcciippiieennttss,, 
nnuuttrriieennttss aanndd mmeeddiiccaammeennttss aarree uunniiffoorrmmllyy ddiissttrriibbuutteedd.. 
AA ww eellll bblleennddeedd pprroodduucctt eennhhaanncceess ppeerrffoorrmmaannccee aanndd iiss aann 
eesssseennttiiaall sstteepp iinn ccoommppllyyiinngg wwiitthh FFDDAAss ccGGMMPPss rreegguullaattiioonnss.. 
AA ssaattiissffaaccttoorryy pprroocceessss pprroodduucceess aa uunniiffoorrmm bblleenndd iinn aa 
mmiinniimmuumm ttiimmee wwiitthh aa mmiinniimmuumm ccoosstt ooff oovveerrhheeaaddss,, ppoowweerr,, 
aanndd llaabboouurr.. 
SSoommee vvaarriiaattiioonn bbeettwweeeenn ssaammpplleess sshhoouulldd bbee eexxppeecctteedd,, bbuutt 
aann iiddeeaall mmiixxttuurree wwoouulldd bbee oonnee wwiitthh mmiinniimmaall vvaarriiaattiioonn iinn 
ccoommppoossiittiioonn.. 
MMeeaassuurriinngg tthhee vvaarriiaattiioonn iinn ffiinniisshheedd pprroodduucctt iiss tthhee ccrruuxx ooff 
bblleennddeerr tteessttiinngg..
A number of factors that determine blender performance 
and Understanding how these factors affect the mixing 
process is essential when interpreting the results of a 
blender test. 
Variable 
 Blending time 
 Blender speed 
 Intensifier bar 
Response 
 Content uniformity 
 Assay 
 Particle size distribution 
 Powder flow 
 Densification/Aeration
FFaaccttoorrss tthhaatt DDeetteerrmmiinnee BBlleennddeerr 
PPeerrffoorrmmaannccee 
BBlleennddeerrss mmaayy hhaavvee ddeeaadd ssppoottss,, wwhheerree ssmmaallll aammoouunnttss ooff 
iinnggrreeddiieennttss mmaayy nnoott bbee rreeaaddiillyy iinnccoorrppoorraatteedd iinnttoo tthhee 
pprroodduucctt.. 
TThhiiss ssiittuuaattiioonn iiss aaggggrraavvaatteedd wwhheenn BBlleennddiinngg rriibbbboonnss,, 
aauuggeerrss,, oorr ppaaddddlleess bbeeccoommee wwoorrnn.. 
GGrroouunndd ggrraaiinn oorr ssooyybbeeaann mmeeaall sshhoouulldd bbee tthhee ffiirrsstt 
iinnggrreeddiieenntt aaddddeedd iinnttoo aa hhoorriizzoonnttaall bblleennddeerr.. 
VVeerrttiiccaall bblleennddeerrss ggeenneerraallllyy pprroovviiddee aann ooppttiimmaall mmiixx wwhheenn 
mmiiccrroo--iinnggrreeddiieennttss aarree aaddddeedd eeaarrllyy iinn tthhee mmaattcchhiinngg 
pprroocceessss ((ee..gg..,, dduurriinngg oorr aafftteerr ssooyybbeeaann mmeeaall,, bbuutt pprriioorr ttoo 
ggrraaiinn))
BBuuiilldduupp ooff mmaatteerriiaall 
BBuuiilldduupp ooff mmaatteerriiaall oonn rriibbbboonnss,, ppaaddddlleess,, oorr 
aauuggeerrss ccaann rreedduuccee bblleennddeerr ppeerrffoorrmmaannccee.. 
TThhee FFDDAAss ccGGMMPPss,, wwhhiicchh ppeerrttaaiinn ttoo pprroodduuccttiioonn 
ooff mmeeddiiccaatteedd pprroodduucctt,, rreeqquuiirree tthhaatt eeqquuiippmmeenntt bbee 
mmaaiinnttaaiinneedd aanndd cclleeaanneedd.. 
RReessiidduuaall mmaatteerriiaall oonn BBlleennddiinngg ppaarrttss ccaann aallssoo 
lleeaadd ttoo pprroodduucctt ccoonnttaammiinnaattiioonn ((ccrroossss-- 
ccoonnttaammiinnaattiioonn))..
OOvveerrffiilllliinngg oorr uunnddeerr--ffiilllliinngg 
IItt lleeaaddss ttoo iinnaaddeeqquuaattee BBlleennddiinngg.. 
OOvveerrffiilllliinngg aa bblleennddeerr ccaann iinnhhiibbiitt tthhee BBlleennddiinngg aaccttiioonn ooff iinnggrreeddiieennttss iinn 
hhoorriizzoonnttaall bblleennddeerrss aatt tthhee ttoopp ooff tthhee bblleennddeerr.. 
FFiilllliinngg aa bblleennddeerr bbeellooww 5500 ppeerrcceenntt ooff iittss rraatteedd ccaappaacciittyy mmaayy rreedduuccee 
BBlleennddiinngg aaccttiioonn aanndd iiss nnoott rreeccoommmmeennddeedd.. 
DDeennssiittyy aanndd ssttaattiicc cchhaarrggee,, sseeqquueennccee ooff iinnggrreeddiieenntt aaddddiittiioonn,, aammoouunntt 
ooff iinnggrreeddiieennttss mmiixxeedd,, bblleennddeerr ddeessiiggnn,, BBlleennddiinngg ttiimmee,, cclleeaannlliinneessss ooff 
tthhee bblleennddeerr,, aanndd wweeaarr oorr mmaaiinntteennaannccee ooff tthhee bblleennddeerr.. 
PPrroodduucctt mmaannuuffaaccttuurreerrss ccaann ccoonnttrrooll mmoosstt ooff tthheessee vvaarriiaabblleess tthhrroouugghh 
eeqquuiippmmeenntt mmaaiinntteennaannccee aanndd ooppeerraattiioonnss ssuucchh aass PPaarrttiiccllee ssiizzee,, 
BBlleennddiinngg ttiimmee,, BBlleennddeerr PPeerrffoorrmmaannccee TTeessttiinngg,, SSaammppllee 
CCoolllleeccttiioonn aanndd tthheeiirr eevvaalluuaattiioonnss..
PPaarrttiiccllee ssiizzee -- GGrroouunndd ggrraaiinn wwiitthh aa ppaarrttiiccllee ssiizzee ooff 
11,,220000--11,,550000 mmiiccrroonnss rreedduucceess tthhee lliikkeelliihhoooodd ooff uunniiffoorrmm 
iinnccoorrppoorraattiioonn ooff mmiiccrroo--iinnggrreeddiieennttss ccoommppaarreedd ttoo ggrraaiinn 
ggrroouunndd ttoo aann aavveerraaggee ppaarrttiiccllee ssiizzee ooff 770000 mmiiccrroonnss.. AA llaarrggee 
ppaarrttiiccllee ssiizzee vvaarriiaattiioonn bbeettwweeeenn ggrraaiinn aanndd mmiiccrroo--iinnggrreeddiieennttss 
aallssoo ccaann rreessuulltt iinn iinnccrreeaasseedd sseeggrreeggaattiioonn aafftteerr BBlleennddiinngg.. 
BBlleennddiinngg ttiimmee –– IItt iiss nneecceessssaarryy ttoo pprroodduuccee aa hhoommooggeennoouuss 
ddiissttrriibbuuttiioonn ooff pprroodduucctt iinnggrreeddiieennttss sshhoouulldd bbee mmeeaassuurreedd ffoorr eeaacchh 
bblleennddeerr.. bblleennddiinngg ttiimmee iiss aa ffuunnccttiioonn ooff bblleennddeerr ddeessiiggnn aanndd tthhee 
rroottaattiioonnaall ssppeeeedd ooff tthhee rriibbbboonn,, ppaaddddllee,, oorr aauuggeerr.. TThhee bbeesstt wwaayy ttoo 
eessttaabblliisshh tthhee aapppprroopprriiaattee mmiixx ttiimmee iiss ttoo ccoonndduucctt aa bblleennddeerr 
ppeerrffoorrmmaannccee tteesstt..
BBlleennddeerr PPeerrffoorrmmaannccee TTeessttiinngg -- ccoonnssiissttss ooff ttwwoo 
ppaarrttss:: 11.. ssaammpplliinngg aanndd 22.. ssaammppllee aannaallyyssiiss.. 
SSaammppllee CCoolllleeccttiioonn -- TThhiiss pprroocceessss ddeeppeennddss oonn tthhee ttyyppee 
((hhoorriizzoonnttaall vveerrssuuss vveerrttiiccaall)) aanndd ddeessiiggnn ooff tthhee bblleennddeerr.. IItt iiss ddiiffffiiccuulltt ttoo 
ccoolllleecctt aa rreepprreesseennttaattiivvee ssaammppllee ddiirreeccttllyy ffrroomm aa vveerrttiiccaall bblleennddeerr uussiinngg 
aa ggrraaiinn pprroobbee,, hheennccee,, ccoolllleeccttiinngg ssaammpplleess aatt eevveennllyy ssppaacceedd iinntteerrvvaallss 
dduurriinngg bblleennddeerr ddiisscchhaarrggee iiss rreeccoommmmeennddeedd.. 
SSaammpplleess ccaann bbee ttaakkeenn ffrroomm tthhee ssppoouutt eenndd ooff ppoorrttaabbllee 
ggrriinnddeerrss//bblleennddeerrss oorr nneeaarr tthhee ddiisscchhaarrggee ppooiinntt ffoorr aa 
ssttaattiioonnaarryy vveerrttiiccaall bblleennddeerr.. HHoorriizzoonnttaall bblleennddeerrss aarree 
uussuuaallllyy aacccceessssiibbllee ffrroomm tthhee ttoopp wwhhiicchh ppeerrmmiittss ssaammppllee 
ccoolllleeccttiioonn ddiirreeccttllyy ffrroomm tthhee bblleennddeerr uussiinngg aa ggrraaiinn pprroobbee.. 
SSaammpplleess sshhoouulldd bbee ddrraawwnn ffrroomm 1100 pprree--ddeessiiggnnaatteedd 
llooccaattiioonnss oorr aatt eevveenn iinntteerrvvaallss dduurriinngg bblleennddeerr ddiisscchhaarrggee..
BBlleennddeerr ppeerrffoorrmmaannccee TTeesstt –– uussiinngg aa mmiiccrroo-- 
iinnggrreeddiieenntt tthhaatt rreeqquuiirreess aann eexxppeennssiivvee llaabboorraattoorryy aassssaayy,, 
((ee..gg.. ddrruugg)),, iitt mmaayy bbeeccoommee nneecceessssaarryy ttoo mmaakkee aa ttrraaddee ooffff 
bbeettwweeeenn tthhee ccoosstt aanndd aaccccuurraaccyy ooff tthhee tteesstt.. 
TToo sseelleecctt tthhee ooppttiimmuumm bblleennddiinngg ttiimmee,, pprroodduucctt ssaammpplleess 
mmuusstt bbee ccoolllleecctteedd aatt iinntteerrvvaallss oovveerr aann eexxtteennddeedd ppeerriioodd.. 
FFoorr eexxaammppllee,, aa hhoorriizzoonnttaall bblleennddeerr ccaann bbee eevvaalluuaatteedd ffoorr 
ooppttiimmaall bblleennddiinngg ttiimmee aass ffoolllloowwss:: rruunn tthhee bblleennddeerr ffoorr ttwwoo 
mmiinnuutteess,, ssttoopp tthhee bblleennddeerr aanndd ccoolllleecctt 1100 rreepprreesseennttaattiivvee 
ssaammpplleess ffrroomm pprreeddeetteerrmmiinneedd llooccaattiioonnss,, rruunn tthhee bblleennddeerr 
ttwwoo mmoorree mmiinnuutteess,, ssttoopp tthhee bblleennddeerr aanndd ccoolllleecctt tteenn 
ssaammpplleess ffrroomm tthhee ssaammee llooccaattiioonnss aass tthhee pprreevviioouuss 
ssaammpplliinngg.. 
RReeppeeaatt tthhiiss pprroocceessss ffoorr tteenn mmiinnuutteess ((ffiivvee ssaammpplliinngg 
ttiimmeess))..
Milling 
Variable Response 
Screen size Particle size 
distribution/shape 
Milling speed Loose/tapped 
densities 
Feed rate
Granulation 
Control Parameters 
Fixed Variable (Monitor) Response (Test) 
Equipment Mixing speeds Drug distribution 
Batch size Amount of granulation fluid Water/solvent 
content 
Feed rate Appearance (size) 
Granulation time Power consumption 
(amp/torque) 
Load
Fluid Bed Drying 
Fixed Variable (Monitor) Response (Test) 
Bowl charge Inlet/exhaust air Particle size 
temperature distribution 
Porosity of Product temperature Densities 
filter bags Drying time Loss on drying 
Air volume Assay (for heat 
Humidity of incoming sensitive 
air (dew point) materials) 
Humidity of exhaust air 
Bowl sieve
Lubrication 
Variable Response 
Blender speed Particle size distribution 
Blending time Loose/tapped densities 
Method of addition Flow properties 
Tabletting characteristics 
(friability, hardness)
Compression 
Variable Response 
Speed of press Appearance 
Pre-compression Weight variation 
Compression force Hardness/friability 
Feed frame 
(open/forced) Thickness 
Feeder speed Moisture content 
Disintegration/ 
dissolution 
Assay/dose 
uniformity
Pan Coating 
Variable Response 
Pan load Percent weight gain 
Inlet/exhaust temperatures Thickness 
Inlet/exhaust humidities Elegance 
Pan speed Dissolution 
Spray nozzle size Assay 
Atomizing pressure Degradation level 
Spray rate Residual solvent 
Spray angle 
Gun to bed distance 
Tablet core characteristics
Approaches to Improve Process 
Validation 
Definition of in-process specifications (e.g. LOD, particle 
size) 
– Capability of process 
• Adequate operating parameters or specifications 
• Probability of OOS (Out of Specification Results) 
– Criticalness, necessity 
– Challenges - “worst case” 
Sampling methods 
– Defined in protocol 
– Evaluated before validation 
Equipment OQ 
– Simulate production conditions (e.g., drying time) 
– Review equipment history (deviations, corrections) 
– Review set-up procedures
Focus on “newness” - anything new: components or 
rawmaterials, equipment, process or package steps, 
dosage form 
• Adequate trials at full-size for new item 
• Assure raw material/component is from vendor’s routine 
production 
• Complete review of pre-validation documentation 
• Adequately identify cause and correct problems 
• Data used in establishing operating ranges and 
specifications 
• Data submitted to regulatory agencies
Handling out-of specification (OOS) results 
– Identify if caused by equipment, product, normal 
process variation, or error or combination 
– May require additional experimentation 
– Pursue conservative approach, if unsure of cause 
Mechanism to bring development/validation issues to team 
management for resolution 
– Review meetings 
– Team approach 
– Open, honest interactions
Thank You

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Validation of mixing, granulation, lubrication, compression and coating

  • 1. VVaalliiddaattiioonn ooff TTaabblleettttiinngg PPrroocceessss DDrr.. LL .. PPrraabbaakkaarraann PPrrooff.. && HHeeaadd RR.. RR.. CCoolllleeggee ooff PPhhaarrmmaaccyy BBaannggaalloorree --9900..
  • 2. Some Common Variables In The Manufacture Of Tablet Products Particle size of drug substance Milling conditions Bulk density of drug substance/excipients Lubricant blending times Powder load in granulator Tablet hardness Amount and concentration of binder Coating solution spray rate Mixer speed and mixing times Granulation moisture content
  • 3. TThheeoorryy –– PPoowwddeerr BBlleennddiinngg TThhee mmiixxeerr iiss uusseedd ttoo pprroodduuccee pprroodduucctt iinn wwhhiicchh eexxcciippiieennttss,, nnuuttrriieennttss aanndd mmeeddiiccaammeennttss aarree uunniiffoorrmmllyy ddiissttrriibbuutteedd.. AA ww eellll bblleennddeedd pprroodduucctt eennhhaanncceess ppeerrffoorrmmaannccee aanndd iiss aann eesssseennttiiaall sstteepp iinn ccoommppllyyiinngg wwiitthh FFDDAAss ccGGMMPPss rreegguullaattiioonnss.. AA ssaattiissffaaccttoorryy pprroocceessss pprroodduucceess aa uunniiffoorrmm bblleenndd iinn aa mmiinniimmuumm ttiimmee wwiitthh aa mmiinniimmuumm ccoosstt ooff oovveerrhheeaaddss,, ppoowweerr,, aanndd llaabboouurr.. SSoommee vvaarriiaattiioonn bbeettwweeeenn ssaammpplleess sshhoouulldd bbee eexxppeecctteedd,, bbuutt aann iiddeeaall mmiixxttuurree wwoouulldd bbee oonnee wwiitthh mmiinniimmaall vvaarriiaattiioonn iinn ccoommppoossiittiioonn.. MMeeaassuurriinngg tthhee vvaarriiaattiioonn iinn ffiinniisshheedd pprroodduucctt iiss tthhee ccrruuxx ooff bblleennddeerr tteessttiinngg..
  • 4. A number of factors that determine blender performance and Understanding how these factors affect the mixing process is essential when interpreting the results of a blender test. Variable  Blending time  Blender speed  Intensifier bar Response  Content uniformity  Assay  Particle size distribution  Powder flow  Densification/Aeration
  • 5. FFaaccttoorrss tthhaatt DDeetteerrmmiinnee BBlleennddeerr PPeerrffoorrmmaannccee BBlleennddeerrss mmaayy hhaavvee ddeeaadd ssppoottss,, wwhheerree ssmmaallll aammoouunnttss ooff iinnggrreeddiieennttss mmaayy nnoott bbee rreeaaddiillyy iinnccoorrppoorraatteedd iinnttoo tthhee pprroodduucctt.. TThhiiss ssiittuuaattiioonn iiss aaggggrraavvaatteedd wwhheenn BBlleennddiinngg rriibbbboonnss,, aauuggeerrss,, oorr ppaaddddlleess bbeeccoommee wwoorrnn.. GGrroouunndd ggrraaiinn oorr ssooyybbeeaann mmeeaall sshhoouulldd bbee tthhee ffiirrsstt iinnggrreeddiieenntt aaddddeedd iinnttoo aa hhoorriizzoonnttaall bblleennddeerr.. VVeerrttiiccaall bblleennddeerrss ggeenneerraallllyy pprroovviiddee aann ooppttiimmaall mmiixx wwhheenn mmiiccrroo--iinnggrreeddiieennttss aarree aaddddeedd eeaarrllyy iinn tthhee mmaattcchhiinngg pprroocceessss ((ee..gg..,, dduurriinngg oorr aafftteerr ssooyybbeeaann mmeeaall,, bbuutt pprriioorr ttoo ggrraaiinn))
  • 6. BBuuiilldduupp ooff mmaatteerriiaall BBuuiilldduupp ooff mmaatteerriiaall oonn rriibbbboonnss,, ppaaddddlleess,, oorr aauuggeerrss ccaann rreedduuccee bblleennddeerr ppeerrffoorrmmaannccee.. TThhee FFDDAAss ccGGMMPPss,, wwhhiicchh ppeerrttaaiinn ttoo pprroodduuccttiioonn ooff mmeeddiiccaatteedd pprroodduucctt,, rreeqquuiirree tthhaatt eeqquuiippmmeenntt bbee mmaaiinnttaaiinneedd aanndd cclleeaanneedd.. RReessiidduuaall mmaatteerriiaall oonn BBlleennddiinngg ppaarrttss ccaann aallssoo lleeaadd ttoo pprroodduucctt ccoonnttaammiinnaattiioonn ((ccrroossss-- ccoonnttaammiinnaattiioonn))..
  • 7. OOvveerrffiilllliinngg oorr uunnddeerr--ffiilllliinngg IItt lleeaaddss ttoo iinnaaddeeqquuaattee BBlleennddiinngg.. OOvveerrffiilllliinngg aa bblleennddeerr ccaann iinnhhiibbiitt tthhee BBlleennddiinngg aaccttiioonn ooff iinnggrreeddiieennttss iinn hhoorriizzoonnttaall bblleennddeerrss aatt tthhee ttoopp ooff tthhee bblleennddeerr.. FFiilllliinngg aa bblleennddeerr bbeellooww 5500 ppeerrcceenntt ooff iittss rraatteedd ccaappaacciittyy mmaayy rreedduuccee BBlleennddiinngg aaccttiioonn aanndd iiss nnoott rreeccoommmmeennddeedd.. DDeennssiittyy aanndd ssttaattiicc cchhaarrggee,, sseeqquueennccee ooff iinnggrreeddiieenntt aaddddiittiioonn,, aammoouunntt ooff iinnggrreeddiieennttss mmiixxeedd,, bblleennddeerr ddeessiiggnn,, BBlleennddiinngg ttiimmee,, cclleeaannlliinneessss ooff tthhee bblleennddeerr,, aanndd wweeaarr oorr mmaaiinntteennaannccee ooff tthhee bblleennddeerr.. PPrroodduucctt mmaannuuffaaccttuurreerrss ccaann ccoonnttrrooll mmoosstt ooff tthheessee vvaarriiaabblleess tthhrroouugghh eeqquuiippmmeenntt mmaaiinntteennaannccee aanndd ooppeerraattiioonnss ssuucchh aass PPaarrttiiccllee ssiizzee,, BBlleennddiinngg ttiimmee,, BBlleennddeerr PPeerrffoorrmmaannccee TTeessttiinngg,, SSaammppllee CCoolllleeccttiioonn aanndd tthheeiirr eevvaalluuaattiioonnss..
  • 8. PPaarrttiiccllee ssiizzee -- GGrroouunndd ggrraaiinn wwiitthh aa ppaarrttiiccllee ssiizzee ooff 11,,220000--11,,550000 mmiiccrroonnss rreedduucceess tthhee lliikkeelliihhoooodd ooff uunniiffoorrmm iinnccoorrppoorraattiioonn ooff mmiiccrroo--iinnggrreeddiieennttss ccoommppaarreedd ttoo ggrraaiinn ggrroouunndd ttoo aann aavveerraaggee ppaarrttiiccllee ssiizzee ooff 770000 mmiiccrroonnss.. AA llaarrggee ppaarrttiiccllee ssiizzee vvaarriiaattiioonn bbeettwweeeenn ggrraaiinn aanndd mmiiccrroo--iinnggrreeddiieennttss aallssoo ccaann rreessuulltt iinn iinnccrreeaasseedd sseeggrreeggaattiioonn aafftteerr BBlleennddiinngg.. BBlleennddiinngg ttiimmee –– IItt iiss nneecceessssaarryy ttoo pprroodduuccee aa hhoommooggeennoouuss ddiissttrriibbuuttiioonn ooff pprroodduucctt iinnggrreeddiieennttss sshhoouulldd bbee mmeeaassuurreedd ffoorr eeaacchh bblleennddeerr.. bblleennddiinngg ttiimmee iiss aa ffuunnccttiioonn ooff bblleennddeerr ddeessiiggnn aanndd tthhee rroottaattiioonnaall ssppeeeedd ooff tthhee rriibbbboonn,, ppaaddddllee,, oorr aauuggeerr.. TThhee bbeesstt wwaayy ttoo eessttaabblliisshh tthhee aapppprroopprriiaattee mmiixx ttiimmee iiss ttoo ccoonndduucctt aa bblleennddeerr ppeerrffoorrmmaannccee tteesstt..
  • 9. BBlleennddeerr PPeerrffoorrmmaannccee TTeessttiinngg -- ccoonnssiissttss ooff ttwwoo ppaarrttss:: 11.. ssaammpplliinngg aanndd 22.. ssaammppllee aannaallyyssiiss.. SSaammppllee CCoolllleeccttiioonn -- TThhiiss pprroocceessss ddeeppeennddss oonn tthhee ttyyppee ((hhoorriizzoonnttaall vveerrssuuss vveerrttiiccaall)) aanndd ddeessiiggnn ooff tthhee bblleennddeerr.. IItt iiss ddiiffffiiccuulltt ttoo ccoolllleecctt aa rreepprreesseennttaattiivvee ssaammppllee ddiirreeccttllyy ffrroomm aa vveerrttiiccaall bblleennddeerr uussiinngg aa ggrraaiinn pprroobbee,, hheennccee,, ccoolllleeccttiinngg ssaammpplleess aatt eevveennllyy ssppaacceedd iinntteerrvvaallss dduurriinngg bblleennddeerr ddiisscchhaarrggee iiss rreeccoommmmeennddeedd.. SSaammpplleess ccaann bbee ttaakkeenn ffrroomm tthhee ssppoouutt eenndd ooff ppoorrttaabbllee ggrriinnddeerrss//bblleennddeerrss oorr nneeaarr tthhee ddiisscchhaarrggee ppooiinntt ffoorr aa ssttaattiioonnaarryy vveerrttiiccaall bblleennddeerr.. HHoorriizzoonnttaall bblleennddeerrss aarree uussuuaallllyy aacccceessssiibbllee ffrroomm tthhee ttoopp wwhhiicchh ppeerrmmiittss ssaammppllee ccoolllleeccttiioonn ddiirreeccttllyy ffrroomm tthhee bblleennddeerr uussiinngg aa ggrraaiinn pprroobbee.. SSaammpplleess sshhoouulldd bbee ddrraawwnn ffrroomm 1100 pprree--ddeessiiggnnaatteedd llooccaattiioonnss oorr aatt eevveenn iinntteerrvvaallss dduurriinngg bblleennddeerr ddiisscchhaarrggee..
  • 10. BBlleennddeerr ppeerrffoorrmmaannccee TTeesstt –– uussiinngg aa mmiiccrroo-- iinnggrreeddiieenntt tthhaatt rreeqquuiirreess aann eexxppeennssiivvee llaabboorraattoorryy aassssaayy,, ((ee..gg.. ddrruugg)),, iitt mmaayy bbeeccoommee nneecceessssaarryy ttoo mmaakkee aa ttrraaddee ooffff bbeettwweeeenn tthhee ccoosstt aanndd aaccccuurraaccyy ooff tthhee tteesstt.. TToo sseelleecctt tthhee ooppttiimmuumm bblleennddiinngg ttiimmee,, pprroodduucctt ssaammpplleess mmuusstt bbee ccoolllleecctteedd aatt iinntteerrvvaallss oovveerr aann eexxtteennddeedd ppeerriioodd.. FFoorr eexxaammppllee,, aa hhoorriizzoonnttaall bblleennddeerr ccaann bbee eevvaalluuaatteedd ffoorr ooppttiimmaall bblleennddiinngg ttiimmee aass ffoolllloowwss:: rruunn tthhee bblleennddeerr ffoorr ttwwoo mmiinnuutteess,, ssttoopp tthhee bblleennddeerr aanndd ccoolllleecctt 1100 rreepprreesseennttaattiivvee ssaammpplleess ffrroomm pprreeddeetteerrmmiinneedd llooccaattiioonnss,, rruunn tthhee bblleennddeerr ttwwoo mmoorree mmiinnuutteess,, ssttoopp tthhee bblleennddeerr aanndd ccoolllleecctt tteenn ssaammpplleess ffrroomm tthhee ssaammee llooccaattiioonnss aass tthhee pprreevviioouuss ssaammpplliinngg.. RReeppeeaatt tthhiiss pprroocceessss ffoorr tteenn mmiinnuutteess ((ffiivvee ssaammpplliinngg ttiimmeess))..
  • 11. Milling Variable Response Screen size Particle size distribution/shape Milling speed Loose/tapped densities Feed rate
  • 12. Granulation Control Parameters Fixed Variable (Monitor) Response (Test) Equipment Mixing speeds Drug distribution Batch size Amount of granulation fluid Water/solvent content Feed rate Appearance (size) Granulation time Power consumption (amp/torque) Load
  • 13. Fluid Bed Drying Fixed Variable (Monitor) Response (Test) Bowl charge Inlet/exhaust air Particle size temperature distribution Porosity of Product temperature Densities filter bags Drying time Loss on drying Air volume Assay (for heat Humidity of incoming sensitive air (dew point) materials) Humidity of exhaust air Bowl sieve
  • 14. Lubrication Variable Response Blender speed Particle size distribution Blending time Loose/tapped densities Method of addition Flow properties Tabletting characteristics (friability, hardness)
  • 15. Compression Variable Response Speed of press Appearance Pre-compression Weight variation Compression force Hardness/friability Feed frame (open/forced) Thickness Feeder speed Moisture content Disintegration/ dissolution Assay/dose uniformity
  • 16. Pan Coating Variable Response Pan load Percent weight gain Inlet/exhaust temperatures Thickness Inlet/exhaust humidities Elegance Pan speed Dissolution Spray nozzle size Assay Atomizing pressure Degradation level Spray rate Residual solvent Spray angle Gun to bed distance Tablet core characteristics
  • 17. Approaches to Improve Process Validation Definition of in-process specifications (e.g. LOD, particle size) – Capability of process • Adequate operating parameters or specifications • Probability of OOS (Out of Specification Results) – Criticalness, necessity – Challenges - “worst case” Sampling methods – Defined in protocol – Evaluated before validation Equipment OQ – Simulate production conditions (e.g., drying time) – Review equipment history (deviations, corrections) – Review set-up procedures
  • 18. Focus on “newness” - anything new: components or rawmaterials, equipment, process or package steps, dosage form • Adequate trials at full-size for new item • Assure raw material/component is from vendor’s routine production • Complete review of pre-validation documentation • Adequately identify cause and correct problems • Data used in establishing operating ranges and specifications • Data submitted to regulatory agencies
  • 19. Handling out-of specification (OOS) results – Identify if caused by equipment, product, normal process variation, or error or combination – May require additional experimentation – Pursue conservative approach, if unsure of cause Mechanism to bring development/validation issues to team management for resolution – Review meetings – Team approach – Open, honest interactions