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

Table 1

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

	Name of the compound	Hexane			Acetonitrile			Chloroform
		RT (min)	RI	% area	RT (min)	RI	% area	RT (min)	RI	% area
1	Limonene	—	—	—	7.01	1035	1.145	—	—	—
2	Benzene, 1,3-diethyl	7.421	1055	0.271	—	—	—	—	—	—
3	Tridecane,3-methyl	7.543	1061	0.902	—	—	—	7.544	1061	4.431
4	Dodecane,1-ido	11.365	1284	0.523	—	—	—	—	—	—
5	1,4-Benzenediol,2,6-dimethyl	13.337	1425	0.299	13.338	1425	1.794	13.337	1425	3.234
6	Eicosane	14.326	1501	0.999	—		—	14.323	1501	9.651
7	3-Methoxy-5-propylphenol	—	—	—	14.349	1503	0.12	—	—	—
8	1,11-Dodecadiene	—	—	—	16.401	1676	2.147	—	—	—
9	Heptacosane	16.856	1717	0.307	—		—	16.856	1717	2.654
10	Atraric acid	16.899	1721	0.308	16.898	1721	2.193	16.897	1721	7.622
11	Ethyl 2-hydroxy-4-methoxy-6-propylbenzoate	—	—	—	17.899	1908	50.357	—	—	—
12	Palmitic acid	19.404	1982	0.676	—		—	—	—	—
13	Octadecanoic acid, ethyl ester	—	—	—	19.752	1997	2.594	—	—	—
14	Octacosane	21.638		0.323				24.971		4.160
15	Tetradecane	22.499		1.111				—		—
16	Tetracosane	23.325		2.751				25.962		4.432
17	Heptacosane	24.122		6.123				24.121		3.69
18	Nonadecane,9-methyl	24.974		9.799
19	Benzeneacetic acid, 2-tetradecyl ester	25.964		12.110
20	Eicosane, 7-hexyl	26.680		0.462
21	Octacosane	27.145		13.877
22	Squalene	27.637		1.804
23	Heptacosane	28.580		10.263
24	Benzeneacetic acid, 2-tetradecyl ester	30.351		7.912
25	Octacosane	35.305		3.602

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.