Table 1.

Content of biologically active compounds in the investigated extracts.

Sterilization method	TPC* in aqueous Cistus extract (μg/ml)	TFC** in aqueous extract (μg/ml)	TPC* in aqueous Cistus extract (μg/ml)	TFC** in aqueous extract (μg/ml)	TPC* in aqueous Cistus extract containing 1.5 wt% of carboxymethyl chitosan (μg/ml)	TFC** in aqueous extract (μg/ml) containing 1.5 wt% of carboxymethyl chitosan (μg/ml)	TPC* in aqueous Cistus extract containing 1.5 wt% of carboxymethyl chitosan (μg/ml)	TFC** in aqueous extract (μg/ml) containing 1.5 wt% of carboxymethyl chitosan (μg/ml)
	Before sterilization		After sterilization		Before sterilization		After sterilization
Filtration	316.23 ± 15.01	1079.82 ± 4.44	239.81 ± 0.27	745.59 ± 3.16	300.13 ± 0.11	1066.35 ± 3.28	228.39 ± 0.19	741.23 ± 1.27
Radiation			246.54 ± 0.95	801.91 ± 0.84			236.88 ± 0.33	781.83 ± 6.21
Steam			283.32 ± 0.79	903.41 ± 1.03			271.14 ± 0.33	901.49 ± 0.18

^*TPC expressed as the gallic acid equivalent which is commonly used in the pharmaceutical industry to determine the total phenol content⁵⁷; **TFC expressed as the quercetin equivalent.