Fabrication of Dendrimer-Based Polyion Complex Submicrometer-Scaled Structures with Enhanced Stability under Physiological Conditions

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Abstract

Submicrometer-scaled (subμ-) self-assembled materials have been developed based on polyion complex (PIC) formation, in particular for biomedical-applications. However, sufficient stability under physiological conditions is required for their practical use. In this study, PIC formation behavior is examined using a block aniomer, poly(ethylene glycol)-b-poly(aspartic acid), and homocatiomers, poly(l-lysine) (LPK) and dendritic poly(l-lysine) (DPK) with different generations, to elucidate the contribution of the dendritic architecture to stability enhancement. LPK-based PIC shows a subμ-vesicular structure only at 25 °C in the absence of NaCl; in contrast, DPK-based PIC forms a subμ-structure under physiological salt concentration and temperature conditions, even when the number of charges of a single molecule is much smaller than that of LPK. Moreover, the formation of subμ-vesicular and -spherical micellar structures is dependent on DPK generation. Thus, the molecular backbone architecture of the PIC component plays an important role not only in expanding the preparation conditions and enhancing stability, but also in controlling the self-assembled structures, mainly due to the spatially restricted structures of dendrimers.

Original languageEnglish
Pages (from-to)1087-1093
Number of pages7
JournalMacromolecular rapid communications
Volume37
Issue number13
DOIs
Publication statusPublished - Jul 1 2016

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Dendrimers
Fabrication
Lysine
Aspartic Acid
Polyethylene glycols
Salts
Molecules
Acids
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Fabrication of Dendrimer-Based Polyion Complex Submicrometer-Scaled Structures with Enhanced Stability under Physiological Conditions",
abstract = "Submicrometer-scaled (subμ-) self-assembled materials have been developed based on polyion complex (PIC) formation, in particular for biomedical-applications. However, sufficient stability under physiological conditions is required for their practical use. In this study, PIC formation behavior is examined using a block aniomer, poly(ethylene glycol)-b-poly(aspartic acid), and homocatiomers, poly(l-lysine) (LPK) and dendritic poly(l-lysine) (DPK) with different generations, to elucidate the contribution of the dendritic architecture to stability enhancement. LPK-based PIC shows a subμ-vesicular structure only at 25 °C in the absence of NaCl; in contrast, DPK-based PIC forms a subμ-structure under physiological salt concentration and temperature conditions, even when the number of charges of a single molecule is much smaller than that of LPK. Moreover, the formation of subμ-vesicular and -spherical micellar structures is dependent on DPK generation. Thus, the molecular backbone architecture of the PIC component plays an important role not only in expanding the preparation conditions and enhancing stability, but also in controlling the self-assembled structures, mainly due to the spatially restricted structures of dendrimers.",
author = "Kenshiro Naoyama and Takeshi Mori and Yoshiki Katayama and Akihiro Kishimura",
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AU - Katayama, Yoshiki

AU - Kishimura, Akihiro

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N2 - Submicrometer-scaled (subμ-) self-assembled materials have been developed based on polyion complex (PIC) formation, in particular for biomedical-applications. However, sufficient stability under physiological conditions is required for their practical use. In this study, PIC formation behavior is examined using a block aniomer, poly(ethylene glycol)-b-poly(aspartic acid), and homocatiomers, poly(l-lysine) (LPK) and dendritic poly(l-lysine) (DPK) with different generations, to elucidate the contribution of the dendritic architecture to stability enhancement. LPK-based PIC shows a subμ-vesicular structure only at 25 °C in the absence of NaCl; in contrast, DPK-based PIC forms a subμ-structure under physiological salt concentration and temperature conditions, even when the number of charges of a single molecule is much smaller than that of LPK. Moreover, the formation of subμ-vesicular and -spherical micellar structures is dependent on DPK generation. Thus, the molecular backbone architecture of the PIC component plays an important role not only in expanding the preparation conditions and enhancing stability, but also in controlling the self-assembled structures, mainly due to the spatially restricted structures of dendrimers.

AB - Submicrometer-scaled (subμ-) self-assembled materials have been developed based on polyion complex (PIC) formation, in particular for biomedical-applications. However, sufficient stability under physiological conditions is required for their practical use. In this study, PIC formation behavior is examined using a block aniomer, poly(ethylene glycol)-b-poly(aspartic acid), and homocatiomers, poly(l-lysine) (LPK) and dendritic poly(l-lysine) (DPK) with different generations, to elucidate the contribution of the dendritic architecture to stability enhancement. LPK-based PIC shows a subμ-vesicular structure only at 25 °C in the absence of NaCl; in contrast, DPK-based PIC forms a subμ-structure under physiological salt concentration and temperature conditions, even when the number of charges of a single molecule is much smaller than that of LPK. Moreover, the formation of subμ-vesicular and -spherical micellar structures is dependent on DPK generation. Thus, the molecular backbone architecture of the PIC component plays an important role not only in expanding the preparation conditions and enhancing stability, but also in controlling the self-assembled structures, mainly due to the spatially restricted structures of dendrimers.

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