期刊
BIOORGANIC & MEDICINAL CHEMISTRY
卷 25, 期 4, 页码 1389-1393出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2016.12.044
关键词
Molecular probe; F-19 NMR; Silsesquioxane; Fluorinated compound; Paramagnetic relaxation enhancement
资金
- ESPEC Foundation for Global Environment Research and Technology (Charitable Trust) (ESPEC Prize for the Encouragement of Environmental Studies)
- MEXT/JSPS KAKENHI Grant [16K17913]
- JSPS KAKENHI Grant [2401, JP25102521]
- Grants-in-Aid for Scientific Research [16K14063, 16K17913, 17H01220] Funding Source: KAKEN
This manuscript reports the detection system with F-19 NMR probes for bioactive amine compounds at sub-micro molar concentrations. Water-soluble fluorinated polyhedral oligomeric silsesquioxane (POSS) derivatives were prepared, and the paramagnetic Ni-porphyrin (NiPor) with the fluorinated POSS (F-POSS) was adsorbed in the buffer. By adding the series of amine derivatives to the homogeneous dispersion containing the POSS-NiPor complexes, the changes in the signal intensity were evaluated. It was clearly observed from homogeneous dispersions that the signal intensity of F-19 NMR decreased especially in the presence of ethanediamine and hexylamine. From the dynamic light scattering measurements, it was revealed that the assembly of the F-POSS complexes was dramatically induced by the amine compounds when the signal intensity decreased. According to these data, it is proposed that the signal reduction of F-19 NMR from the POSS-NiPor complexes could be induced via the strong paramagnetic relaxation enhancement from NiPor in the assembly. Finally, based on the signal reduction by the assembly, we can detect the amine derivatives under 1 mu M concentration which is similar sensitivity to the conventional fluorescence probes. Our system is valid to monitor the distribution of the bio-active molecules at cellular concentrations. (C) 2017 Elsevier Ltd. All rights reserved.
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