Multifunctional Yolk-in-Shell Nanoparticles for pH-triggered Drug Release and Imaging

作者：Chen Hongyu; Qi Bin; Moore Thomas; Wang Fenglin; Colvin Daniel C; Sanjeewa Liurukara D; Gore John C; Hwu Shiou Jyh; Mefford O Thompson; Alexis Frank; Anker Jeffrey N^*

来源：Small, 2014, 10(16): 3364-3370.

DOI：10.1002/smll.201303769

Multifunctional nanoparticles are synthesized for both pH-triggered drug release and imaging with radioluminescence, upconversion luminescent, and magnetic resonance imaging (MRI). The particles have a yolk-in-shell morphology, with a radioluminescent core, an upconverting shell, and a hollow region between the core and shell for loading drugs. They are synthesized by controlled encapsulation of a radioluminescent nanophosphor yolk in a silica shell, partial etching of the yolk in acid, and encapsulation of the silica with an upconverting luminescent shell. Metroxantrone, a chemotherapy drug, was loaded into the hollow space between X-ray phosphor yolk and up-conversion phosphor shell through pores in the shell. To encapsulate the drug and control the release rate, the nanoparticles are coated with pH-responsive biocompatible polyelectrolyte layers of charged hyaluronic acid sodium salt and chitosan. The nanophosphors display bright luminescence under X-ray, blue light (480 nm), and near infrared light (980 nm). They also served as T-1 and T-2 MRI contrast agents with relaxivities of 3.5 mM(-1) s(-1) (r(1)) and 64 mM(-1) s(-1) (r(2)). These multifunctional nanocapsules have applications in controlled drug delivery and multimodal imaging.

• 出版日期2014-8-27