29Si Isotope-Enriched Silicon Nanoparticles for an Efficient Hyperpolarized Magnetic Resonance Imaging Probe

Jiwon Kim, Donghyuk Jo, Seung Hyun Yang, Chan Gyu Joo, Nicholas Whiting, Shivanand Pudakalakatti, Hyeonglim Seo, Hye Young Son, Sun Joon Min, Pratip Bhattacharya, Yong Min Huh, Jeong Hyun Shim, Youngbok Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Silicon particles have garnered attention as promising biomedical probes for hyperpolarized 29Si magnetic resonance imaging and spectroscopy. However, due to the limited levels of hyperpolarization for nanosized silicon particles, microscale silicon particles have primarily been the focus of dynamic nuclear polarization (DNP) applications, including in vivo magnetic resonance imaging (MRI). To address these current challenges, we developed a facile synthetic method for partially 29Si-enriched porous silicon nanoparticles (NPs) (160 nm) and examined their usability in hyperpolarized 29Si MRI agents with enhanced signals in spectroscopy and imaging. Hyperpolarization characteristics, such as the build-up constant, the depolarization time (T1), and the overall enhancement of the 29Si-enriched silicon NPs (10 and 15%), were thoroughly investigated and compared with those of a naturally abundant NP (4.7%). During optimal DNP conditions, the 15% enriched silicon NPs showed more than 16-fold higher enhancements-far beyond the enrichment ratio-than the naturally abundant sample, further improving the signal-to-noise ratio in in vivo 29Si MRI. The 29Si-enriched porous silicon NPs used in this work are potentially capable to serve as drug-delivery vehicles in addition to hyperpolarized 29Si in vivo, further enabling their potential future applicability as a theragnostic platform.

Original languageEnglish
Pages (from-to)56923-56930
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number48
Publication statusPublished - 2021 Dec 8

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF-2019R1C1C1005412 and NRF-2020R1A4A4079870) and a grant (GP2021-0010) from the Korea Research Institute of Standards and Science.

Publisher Copyright:
© 2021 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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