Ricardo Javier Vazquez
Email Address
ricardo@nus.edu.sg
Organizational Units
SPECIALTY RESEARCH INST/CTRS
faculty
CHEMISTRY
dept
SCIENCE
faculty
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Publication Conjugated Oligoelectrolytes for Long-Term Tumor Tracking with Incremental NIR-II Emission(WILEY-V C H VERLAG GMBH, 2022-05) Zhou, Cheng; Li, Zeshun; Zhu, Ziyue; Chia, Geraldine WN; Mikhailovsky, Alexander; Vazquez, Ricardo Javier; Chan, Samuel JW; Li, Kai; Liu, Bin; Bazan, Guillermo C; Prof Bin Liu; CHEMISTRY; CHEMICAL & BIOMOLECULAR ENGINEERINGThe design and synthesis of the near-infrared (NIR)-II emissive conjugated oligoelectrolyte COE-BBT are reported. COE-BBT has a solubility in aqueous media greater than 50 mg mL−1, low toxicity, and a propensity to intercalate lipid bilayers, wherein it exhibits a higher emission quantum yield relative to aqueous media. Addition of COE-BBT to cells provides two emission channels, at ≈500 and ≈1020 nm, depending on the excitation wavelength, which facilitates in vitro confocal microscopy and in vivo animal imaging. The NIR-II emission of COE-BBT is used to track intracranial and subcutaneous tumor progression in mice. Of relevance is that the total NIR-II intensity increases over time. This phenomenon is attributed to a progressive attenuation of a COE-BBT self-quenching effect within the cells due to the expected dye dilution per cell as the tumor proliferates.