Synthesis, Characterization, and Biocompatibility of Biodegradable Hyperbranched Polyglycerols from Acid-Cleavable Ketal Group Functionalized Initiators
作者:Rajesh A. Shenoi、Benjamin F. L. Lai、Jayachandran N. Kizhakkedathu
DOI:10.1021/bm300959h
日期:2012.10.8
Herein we report the synthesis of biodegradable hyperbranchedpolyglycerols (BHPGs) having acid-cleavable core structure by anionic ring-opening multibranching polymerization (ROMBP) of glycidol using initiators bearing dimethyl and cyclohexyl ketal groups. Five different multifunctional initiators carrying one to four ketal groups and two to four hydroxyl groups per molecule were synthesized. The
Poly(Ethylene Glycol) Dimethacrylates with Cleavable Ketal Sites: Precursors for Cleavable PEG-Hydrogels
作者:Hannah Pohlit、Daniel Leibig、Holger Frey
DOI:10.1002/mabi.201600532
日期:2017.10
introduce poly(ethylene glycol) (PEG) based macromonomers containing acid‐labile ketal moieties as well as terminal methacrylate units that are amenable to radical polymerization. The synthesis of PEGs of different molecular weights (ranging from 2000 to 13 000 g mol−1 with polydispersities <1.15) with a central ketal unit (PEG‐ketal‐diol) and their conversion to PEG‐ketal‐dimethacrylates (PEG‐ketal‐DMA) is
作者介绍了基于聚乙二醇(PEG)的大分子单体,该单体包含酸不稳定的缩酮部分以及适合自由基聚合的甲基丙烯酸酯末端单元。具有中心缩酮单元(PEG-缩酮-二醇)的不同分子量(范围从2000到13000 g mol -1,多分散度<1.15)的PEG的合成及其转化为PEG-缩酮-二甲基丙烯酸酯(PEG-缩酮- DMA)介绍。PEG-缩酮-二醇和PEG-缩酮-DMA的降解率均采用原位法1在氘化磷酸盐缓冲液中的1 H NMR动力学研究。分别合成了含有0、5或10 wt%的PEG-ketal-DMA和100、95或90 wt%的PEG-DMA的水凝胶,并在不同pH值的缓冲液中研究了凝胶的崩解。对于含有PEG-ketal-DMA的水凝胶,在pH 5时会出现凝胶的明显崩解,而在中性pH或不含PEG-ketal-DMA的PEG水凝胶中均未观察到可见的降解。
[EN] POLYACETAL OR POLYKETAL AND ETHER POLYMERS<br/>[FR] POLYMÈRES DE POLYACÉTAL OU DE POLYCÉTAL ET D'ÉTHER
申请人:UNIV BRITISH COLUMBIA
公开号:WO2011140644A1
公开(公告)日:2011-11-17
The present invention relates to polymers represented by the following formula (I): The invention further provides methods for their preparation and methods for site-specific delivery of nucleic acids by combining them with targeting ligands, endosomolytic ligands and/or PK modulator ligands.
Branched Multifunctional Polyether Polyketals: Variation of Ketal Group Structure Enables Unprecedented Control over Polymer Degradation in Solution and within Cells
作者:Rajesh A. Shenoi、Jayaprakash K. Narayanannair、Jasmine L. Hamilton、Benjamin F. L. Lai、Sonja Horte、Rajesh K. Kainthan、Jos P. Varghese、Kallanthottathil G. Rajeev、Muthiah Manoharan、Jayachandran N. Kizhakkedathu
DOI:10.1021/ja305080f
日期:2012.9.12
their backbone that exhibit unprecedented controlover degradation in solution and within the cells. High-molecular-weight and highly compact poly(ketal hydroxyethers) (PKHEs) were synthesized from newly designed α-epoxy-ω-hydroxyl-functionalized AB(2)-type ketal monomers carrying structurally different ketal groups (both cyclic and acyclic) with good controlover polymer properties by anionic ring-opening
多功能生物相容性和可生物降解纳米材料结合了特定的可降解连接,可响应各种刺激并具有明确的降解特征,对于靶向纳米医学的发展至关重要。在此,我们首次报告了一类新的多功能树枝状聚醚聚缩酮,其主链中含有不同的缩酮键,它们对溶液中和细胞内的降解表现出前所未有的控制。高分子量和高度紧凑的聚(缩酮羟基醚)(PKHEs)由新设计的带有结构不同缩酮基团(环状和非环状)的 α-环氧-ω-羟基官能化 AB(2) 型缩酮单体合成通过阴离子开环多支化聚合对聚合物性能进行良好控制。在没有缩酮基团降解的情况下实现了具有多个叠氮化物和胺基团的聚合物官能化。聚合物降解主要受主链中取代缩酮基团的结构差异和扭转应变的控制,而对于具有线性(无环)缩酮基团的聚合物,聚合物的疏水性可能起到额外的作用。这得到单体的 log P 值和使用芘作为探针的荧光光谱测定的聚合物疏水性的支持。聚合物在弱酸性 pH 值下的水解半衰期范围从几分钟到几百