Chemical Composition, Antioxidant, and Antimicrobial Activities of Lichen Umbilicaria cylindrica (L.) Delise (Umbilicariaceae)

Table 1

Retention time of the examined lichen substances and their absorbance maxima (nm).

Peaks no.	Compound	Retention time (𝑡R ± SD)* (min)	Absorbance maxima (nm); UV spectrum
1	Salazinic acid	3.36±0.01	213, 238, 312
2	Norstictic acid	3.98±0.20	212, 238, 310
3	Methyl-β-orcinol carboxylate	4.28±0.05	218, 267, 303
4	Ethyl haematommate	6.15±0.20	240, 258, 285^m, 337
5	Usnic acid	19.16±0.30	234, 282
6	Atranorin	21.71±0.30	210, 252, 321^m

*Values are the means of three determinations ± SD, m: minor absorbance maximum.