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Luminescent Difluoroboron β-Diketonate PLA–PEG Nanoparticle
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-02-02 00:00:00 , DOI: 10.1021/acs.biomac.6b01708
Caroline Kerr 1 , Christopher A. DeRosa 1 , Margaret L. Daly 1 , Hengtao Zhang 2 , Gregory M. Palmer 2 , Cassandra L. Fraser 1
Affiliation  

Luminescent difluoroboron β-diketonate poly(lactic acid) (BF2bdkPLA) materials serve as biological imaging agents. In this study, dye structures were modified to achieve emission colors that span the visible region with potential for multiplexing applications. Four dyes with varying π-conjugation (phenyl, naphthyl) and donor groups (−OMe, −NMe2) were coupled to PLLA–PEG block copolymers (∼11 kDa) by a postpolymerization Mitsunobu reaction. The resulting dye–polymer conjugates were fabricated as nanoparticles (∼55 nm diameter) to produce nanomaterials with a range of emission colors (420–640 nm). For increased stability, dye-PLLA-PEG conjugates were also blended with dye-free PDLA–PEG to form stereocomplex nanoparticles of smaller size (∼45 nm diameter). The decreased dye loading in the stereoblocks blue-shifted the emission, generating a broader range of fluorescence colors (410–620 nm). Tumor accumulation was confirmed in a murine model through biodistribution studies with a red emitting dimethyl amino-substituted dye–polymer analogue. The synthesis, optical properties, oxygen-sensing capabilities, and stability of these block copolymer nanoparticles are presented.

中文翻译:

发光二氟硼β-二酮酸酯PLA-PEG纳米颗粒

发光二氟硼β-二酮酸聚乳酸(BF 2 bdkPLA)材料用作生物成像剂。在这项研究中,对染料的结构进行了修改,以实现跨越可见区域的发射颜色,并具有进行多路复用应用的潜力。四种具有不同π共轭(苯基,萘基)和施主基团(-OMe,-NMe 2的染料))通过Mitsunobu后聚合反应与PLLA-PEG嵌段共聚物(〜11 kDa)偶联。所得的染料-聚合物共轭物被制成纳米颗粒(直径约55 nm),以产生具有多种发射颜色(420-640 nm)的纳米材料。为了提高稳定性,还将染料-PLLA-PEG共轭物与无染料的PDLA-PEG共混以形成较小尺寸(直径约45 nm)的立体复合纳米颗粒。立体块中染料负载的减少使发射蓝移,从而产生了更宽范围的荧光色(410-620 nm)。通过使用红色发光的二甲基氨基取代的染料-聚合物类似物进行生物分布研究,在鼠模型中确认了肿瘤蓄积。介绍了这些嵌段共聚物纳米粒子的合成,光学性质,氧传感能力和稳定性。
更新日期:2017-02-02
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