Electron spin resonance spectral analysis of irradiated
royal jelly
Food Chem, 2014 Jan 15;143:479-83
The analysis of unpaired electron components in royal jelly
was carried out using electron spin resonance (ESR) with the aim to develop a
detection method for irradiated royal jelly.
The ESR spectrum of royal jelly had natural signals derived
from transition metals, including Fe(3+) and Cu(2+), and a signal line near
g=2.00. After irradiation, a new splitting asymmetric spectrum with overall
spectrum width ca. 10mT at g=2.004 was observed. The intensities of the signals
at g=2.004 increased in proportion to the absorbed dose in samples under
different storage conditions: fresh frozen royal jelly and dried royal jelly
powder at room temperature. The signal intensity of the fresh frozen sample was
stable after irradiation.
One year after 10kGy irradiation of dried powder, the signal
intensity was sevenfold greater than before irradiation, although the intensity
continued to steadily decrease with time.
This stable radiation-induced radical component was derived
from the poorly soluble constituent of royal jelly.
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