Chemical Composition and Antimicrobial Activity of Two Sri Lankan Lichens, Parmotrema rampoddense, and Parmotrema tinctorum against Methicillin-Sensitive and Methicillin-Resistant Staphylococcus aureus

Table 2

Chemical constituents identified in abundance in the GC-MS analysis of P.tinctorum.

	Name of the compound	Hexane			Acetonitrile			Chloroform
		RT (min)	RI	% area	RT (min)	RI	% area	RT (min)	RI	% area
1	Benzaldehyde,2,4,-dimethyl	—	—	—	10.409	1223	0.265	10.409	1223	0.73
2	Hexadecane,2,6,10,14-tetramethyl	—	—	—	—	—	—	11.337	1283	0.228
3	3,5-Dihydroxytoluene	—	—	—	12.65	1374	30.086	12.654	1375	2.572
4	1,4-Benzenediol, 2,6-dimethyl	13.342	1425	1.915	13.335	1425	2.939	13.339	1425	4.084
5	Chloroatranol (3-chloro-2,6-dihydroxy-4-methyl benzaldehyde)	—	—	—	—	—	—	14.44	1511	0.633
6	Benzaldehyde,2,4-dihydroxy-6-methyl	—	—	—	15.039	1560	2.758	15.035	1560	11.671
7	Atraric acid	16.888	1720	6.723	16.888	1720	16.422	16.901	1721	52.174
8	7-Hexadecanoic acid, methyl ester	—		—	19.069	1966	0.685	18.879	1956	0.478
9	Pentadecanoic acid,14-methyl,methyl ester	19.07	1966	1.436	—	—	—	19.073	1966	1.616
10	n-Hexadecanoic acid	—	—	—	—	—	—	19.392	1982	1.402
11	9-Octadecanoic acid, methyl ester	20.761	—	1.932	20.76	-	0.696	20.763	—	2.058
12	Octadecanoic acid	20.92	—	0.702	—	—	—	20.983	—	0.285

RT, retention time (min.), RI, –nonisothermal retention index calculated using Van Den Dool and Kratz method using C₈–C₂₀ alkane series. %, area is expressed as percentage of the peak area to the total peak area.