| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1231636 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2015 | 4 Pages |
•We developed a surface-type cavity of 9 GHz EPR and applied it to measure human fingers and nails.•Dynamics of topically applied 1.0 mM TEMPOL solution on a human finger and nail were investigated.•The 9 GHz surface-type detection exhibits the good potential of studying biomedical samples.
We developed an innovative surface-type cavity for 9 GHz electron paramagnetic resonance (EPR) and used it to non-invasively measure human fingers and nails. This surface-type cavity measures a sample on the top of the cavity instead of a sample inserted into the cavity. To verify the performance of this method, 5–10 μL of 0.1 mM 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPOL) aqueous solution in a 1.0-mm (i.d.) glass capillary was used. Although the detectable radical concentration of the surface-type cavity is lower than that of a commercial cavity, the surface-type cavity can measure biomedical samples. In addition, the cavity is capable of measuring human fingers and nails. The dynamics of a topically applied 1.0-mM TEMPOL solution with a commercial lotion (5:1 by weight) on a human finger and nail were investigated. The present EPR results suggest that TEMPOL in solution may not easily permeate into the finger and nail during the measurements. Therefore, 9 GHz surface-type detection exhibits the good potential to study paramagnetic species in bulky biomedical samples.
Graphical abstractDemonstrative pictures of a non-invasive finger (left-hand) and nail (right-hand) measurements using 9 GHz electron paramagnetic resonance (EPR).Figure optionsDownload full-size imageDownload as PowerPoint slide
