Effect of UV Irradiation and Temperature on Free Radical Properties in Dehydrocholic and Ursodeoxycholic Acids: An EPR Study

Table 2

Parameters of the EPR spectra of thermally sterilized dehydrocholic acid (DH) and also ursodeoxycholic acid (UDC).

Compound	Conditions	a. u.; ±0.02	a. u.; ±0.02	mT; ±0.02	spin/g; ±0.02	±0.02	±0.02	±0.0002
DH	160°C; (120 minutes)	0.04	0.04	0.15	1.20	0.95	0.47	1.9983
	170°C; (60 minutes)	0.02	0.01	0.13	0.50	1.00	0.34	1.9979
	180°C; (30 minutes)	0.07	0.09	0.10	2.80	1.34	0.65	1.9954
UDC	160°C; (120 minutes)	0.08	0.50	0.42	15.30	0.61	1.56	1.9985
	170°C; (60 minutes)	0.36	2.52	0.44	58.20	0.88	0.92	1.9982
	180°C; (30 minutes)	0.45	5.21	0.55	122.30	0.90	0.98	1.9961

Notes. —amplitude of signal; —integral intensity; and —the asymmetry parameters; —line-width of EPR signal; —free radical concentrations; —factor.