Related Experiment Video
Updated: Aug 19, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Microwave characterization of aqueous amino acid solutions using the multifrequency WGM resonator technique
Alexey I Gubin1, Alexander A Barannik1, Irina A Protsenko1
1O. Ya. Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, 61085 Kharkiv, Ukraine.
Abstract:
Amino acids play essential role for humans. We studied the dielectric properties of the basic aliphatic amino acids and polar positive amino acids in solutions of different concentrations. The high-Q single microwave whispering gallery-mode (WGM) quartz dielectric resonator based technique, enhanced to a number of measurement frequencies, was applied. The technique allows liquid investigation of micro- to nano- liter volumes filled in microfluidic channel on six discrete frequencies in the 30-40 GHz range. The dependencies of the complex permittivity on the molar mass show almost linear behavior for aliphatic amino acids at different concentrations. The study results are in good agreement with the calculated data obtained by Cole-Cole equation.
Related Concept Videos
Standing Waves in a Cavity
NMR Spectroscopy Of Amines
NMR Spectrometers: Resolution and Error Correction
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
Mass Spectrometry of Amines
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...

