Monitoring of microwave emission from aqueous solution of
horseradish peroxidase (HRP) in the process of the enzyme functioning was carried
out. For the monitoring, a system containing HRP, luminol and
Н2О2 was employed. Microwave emission
measurements were carried out in the 3.4-4.2 GHz frequency range
using the active and passive modes (active-mode and passive-mode measurements). In
the active mode, excitation of the solution in the pulsed electromagnetic field was
accomplished. In the passive mode, no excitation was induced. It appears that the
passive-mode measurements taken in the course of the peroxidase reaction in the
enzyme system have shown a 0.5 °С increase of the microwave signal.
Upon the active-mode measurements, taken in the same reaction conditions, the forced
excitation of the solution has also led to the increase (by 2 °С)
of the level of the microwave signal – i.e. to its 4-fold enhancement compared to the
signal obtained in passive-mode measurements.