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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 Pharmaceutical Performance
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103625
- ISBN
- 9798280771345
- DDC
- 615
- 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
- Lumefantrine
- 기타저자
- The University of Wisconsin - Madison Pharmaceutical Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798280771345
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a615
■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.


