Table 2.

The content of phenolic acids and yield of alcoholic extracts of H. officinalis subsp. aristatus, obtained by Ultrasound Assisted Extraction (UAE), collected in the two years and in three areas: September 2017, Civitaretenga (CIV17-UAE); September 2019, Navelli (NAV19-UAE); October 2019, Campo di Giove (CdG19-UAE).

Ethanolic Extract	Yield	Caftaric acid	Chlorogenic Acid	Rosmarinic Acid
	%	µg of acid/g dried drug ± st. dev.
CIV17-UAE	13.0 ± 0.8	307.53 ± 46.24	7397.38 ± 231.99	759.50 ± 26.14
NAV19-UAE	9.33 ± 0.4	285.79 ± 6.29	3684.78 ± 9.04	278.01 ± 8.45
CdG19-UAE	7.39 ± 0.3	212.59 ± 0.39	3300.20 ± 42.22	523.96 ± 2.50