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Amorphous Drug-Polymer Salts: Effect of Processing Conditions and Polymer Choice on Pharmaceutical Performance
Amorphous Drug-Polymer Salts: Effect of Processing Conditions and Polymer Choice on Pharma...
Amorphous Drug-Polymer Salts: Effect of Processing Conditions and Polymer Choice on Pharmaceutical Performance

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자료유형  
 학위논문 서양
최종처리일시  
20260202103625
ISBN  
9798280771345
DDC  
615
저자명  
Neusaenger, Amy Lan.
서명/저자  
Amorphous Drug-Polymer Salts: Effect of Processing Conditions and Polymer Choice on Pharmaceutical Performance
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
133 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Yu, Lian.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약This dissertation considers the formulation and performance of amorphous solid dispersions (ASDs), particularly amorphous drug-polymer salts.An increasing number of newly identified drug candidates are poorly water soluble, creating a challenging bottleneck in the drug development pipeline that requires alternative formulation approaches to circumvent. ASDs are one of the most popular of these approaches, wherein a poorly soluble drug in its amorphous form is molecularly dissolved in a polymeric carrier. Previous work has shown that an amorphous drug-polymer salt can have significant performance advantages, including long-term stability under accelerated storage conditions and efficient drug release with sustained supersaturation.Here we investigate the factors contributing to an effective amorphous drug-polymer salt, including 1) the manufacturing and processing conditions used to synthesize the formulation and 2) the structure and properties of the polymeric carrier. We find that in the case of lumefantrine (LMF) ASDs formulated with poly(acrylic acid) (PAA), efficient drug-polymer salt formation is facilitated by a simple slurry conversion synthesis procedure which outperforms other conventional ASD manufacturing methods including spray drying, hot melt extrusion, and rotary evaporation. This extensive salt formation is well-correlated with the performance of the formulation, with a compositionally identical melt-quenched ASD with a lower degree of salt formation underperforming that prepared by slurry conversion in both stability and dissolution tests. For LMF dispersed in other acidic polymers, the degree of salt formation achievable was found to be primarily determined by the polymer's acidic group density obtained from non-aqueous titration. Additional study of the slurry conversion method and its generality reveals applicability to a majority of the poorly soluble drugs surveyed. In addition to the previously described LMF, 17 additional poorly soluble drugs including 15 basic, 1 neutral, and 1 acidic drug were formulated with PAA using the standard SC synthesis. Fully amorphous dispersions were successfully prepared under these synthesis conditions for 16 of the 18 drugs at 25% DL and 11 at 50% DL, with most formulations undergoing an observable "clearing" during stirring, indicating complete dissolution and amorphization prior to drying. Furthermore, it was shown that SC could be used to prepare ternary ASDs (two drugs dispersed in PAA) and could also be scaled up at least 60-fold for LMF-PAA at 50% DL with only minor modifications to the stirring method. This demonstrated versatility of the slurry method is encouraging given its very low equipment cost, lower solvent usage than other solvent-based methods, and low energy consumption.Work on ASD dissolution has observed the formation of drug-rich particles that may enhance drug release and supersaturation. For LMF-PAA ASDs dispersed in 0.1% sodium dodecyl sulfate (a common medium for dissolution testing), we find that PAA outperforms other polymers in releasing LMF as nanoparticles and reaching a high apparent solubility (AS), measured after filtration through a 0.2 μm filter. This outperformance of PAA over 9 other dispersion polymers (7 acidic and 2 neutral) persists from 25 to 50% DL, both releasing the greatest amount of LMF and producing the largest volume fraction of small-size (~10 nm) particles. These findings are especially notable considering the high degree of solid-state stability of these same LMF-PAA formulations, showing that if the solubility of a formulation is defined to include both true solubility and apparent solubility (of dispersed nanoparticles), an amorphous drug-polymer salt can be simultaneously stable and soluble. PAA's superior performance in this study suggests its potential viability as a new dispersion polymer and motivates further exploration of its dispersion capabilities.
일반주제명  
Pharmaceutical sciences
일반주제명  
Pharmacology
일반주제명  
Polymer chemistry
일반주제명  
Molecular biology
일반주제명  
Biochemistry
키워드  
Amorphous solid dispersions
키워드  
Poly(acrylic acid)
키워드  
Lumefantrine
키워드  
Drug-polymer salt
기타저자  
The University of Wisconsin - Madison Pharmaceutical Sciences
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■035    ▼a(MiAaPQ)AAI32046367
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■1001  ▼aNeusaenger,  Amy  Lan.
■24510▼aAmorphous  Drug-Polymer  Salts:  Effect  of  Processing  Conditions  and  Polymer  Choice  on  Pharmaceutical  Performance
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a133  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Yu,  Lian.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aThis  dissertation  considers  the  formulation  and  performance  of  amorphous  solid  dispersions  (ASDs),  particularly  amorphous  drug-polymer  salts.An  increasing  number  of  newly  identified  drug  candidates  are  poorly  water  soluble,  creating  a  challenging  bottleneck  in  the  drug  development  pipeline  that  requires  alternative  formulation  approaches  to  circumvent.  ASDs  are  one  of  the  most  popular  of  these  approaches,  wherein  a  poorly  soluble  drug  in  its  amorphous  form  is  molecularly  dissolved  in  a  polymeric  carrier.  Previous  work  has  shown  that  an  amorphous  drug-polymer  salt  can  have  significant  performance  advantages,  including  long-term  stability  under  accelerated  storage  conditions  and  efficient  drug  release  with  sustained  supersaturation.Here  we  investigate  the  factors  contributing  to  an  effective  amorphous  drug-polymer  salt,  including  1)  the  manufacturing  and  processing  conditions  used  to  synthesize  the  formulation  and  2)  the  structure  and  properties  of  the  polymeric  carrier.  We  find  that  in  the  case  of  lumefantrine  (LMF)  ASDs  formulated  with  poly(acrylic  acid)  (PAA),  efficient  drug-polymer  salt  formation  is  facilitated  by  a  simple  slurry  conversion  synthesis  procedure  which  outperforms  other  conventional  ASD  manufacturing  methods  including  spray  drying,  hot  melt  extrusion,  and  rotary  evaporation.  This  extensive  salt  formation  is  well-correlated  with  the  performance  of  the  formulation,  with  a  compositionally  identical  melt-quenched  ASD  with  a  lower  degree  of  salt  formation  underperforming  that  prepared  by  slurry  conversion  in  both  stability  and  dissolution  tests.  For  LMF  dispersed  in  other  acidic  polymers,  the  degree  of  salt  formation  achievable  was  found  to  be  primarily  determined  by  the  polymer's  acidic  group  density  obtained  from  non-aqueous  titration.  Additional  study  of  the  slurry  conversion  method  and  its  generality  reveals  applicability  to  a  majority  of  the  poorly  soluble  drugs  surveyed.  In  addition  to  the  previously  described  LMF,  17  additional  poorly  soluble  drugs  including  15  basic,  1  neutral,  and  1  acidic  drug  were  formulated  with  PAA  using  the  standard  SC  synthesis.  Fully  amorphous  dispersions  were  successfully  prepared  under  these  synthesis  conditions  for  16  of  the  18  drugs  at  25%  DL  and  11  at  50%  DL,  with  most  formulations  undergoing  an  observable  "clearing"  during  stirring,  indicating  complete  dissolution  and  amorphization  prior  to  drying.  Furthermore,  it  was  shown  that  SC  could  be  used  to  prepare  ternary  ASDs  (two  drugs  dispersed  in  PAA)  and  could  also  be  scaled  up  at  least  60-fold  for  LMF-PAA  at  50%  DL  with  only  minor  modifications  to  the  stirring  method.  This  demonstrated  versatility  of  the  slurry  method  is  encouraging  given  its  very  low  equipment  cost,  lower  solvent  usage  than  other  solvent-based  methods,  and  low  energy  consumption.Work  on  ASD  dissolution  has  observed  the  formation  of  drug-rich  particles  that  may  enhance  drug  release  and  supersaturation.  For  LMF-PAA  ASDs  dispersed  in  0.1%  sodium  dodecyl  sulfate  (a  common  medium  for  dissolution  testing),  we  find  that  PAA  outperforms  other  polymers  in  releasing  LMF  as  nanoparticles  and  reaching  a  high  apparent  solubility  (AS),  measured  after  filtration  through  a  0.2  μm  filter.  This  outperformance  of  PAA  over  9  other  dispersion  polymers  (7  acidic  and  2  neutral)  persists  from  25  to  50%  DL,  both  releasing  the  greatest  amount  of  LMF  and  producing  the  largest  volume  fraction  of  small-size  (~10  nm)  particles.  These  findings  are  especially  notable  considering  the  high  degree  of  solid-state  stability  of  these  same  LMF-PAA  formulations,  showing  that  if  the  solubility  of  a  formulation  is  defined  to  include  both  true  solubility  and  apparent  solubility  (of  dispersed  nanoparticles),  an  amorphous  drug-polymer  salt  can  be  simultaneously  stable  and  soluble.  PAA's  superior  performance  in  this  study  suggests  its  potential  viability  as  a  new  dispersion  polymer  and  motivates  further  exploration  of  its  dispersion  capabilities.
■590    ▼aSchool  code:  0262.
■650  4▼aPharmaceutical  sciences
■650  4▼aPharmacology
■650  4▼aPolymer  chemistry
■650  4▼aMolecular  biology
■650  4▼aBiochemistry
■653    ▼aAmorphous  solid  dispersions
■653    ▼aPoly(acrylic  acid)
■653    ▼aLumefantrine
■653    ▼aDrug-polymer  salt
■690    ▼a0572
■690    ▼a0487
■690    ▼a0419
■690    ▼a0307
■690    ▼a0495
■71020▼aThe  University  of  Wisconsin  -  Madison▼bPharmaceutical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357976▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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