Antagonistic Properties of Some Halophilic Thermoactinomycetes Isolated from Superficial Sediment of a Solar Saltern and Production of Cyclic Antimicrobial Peptides by the Novel Isolate Paludifilum halophilum

Table 5

LC-HR-ESI-MS analysis of the most interesting compounds extracted from liquid cultures of Paludifilum halophilum strain SMBg3.

Rt (min)	Accurate mass	Molecular formula	Suggested compound	Notes	Structure
9.08	1141.71463	C60H92O10N12	Gramicidin S-1141	Lipopeptide
4.08	227.13956	C11H18N2O3	Cyclo(L-4-OH-Pro-L-Leu)	Dipeptide
4.83	261.12405	C14H16N2O3	Cyclo(L-Tyr-L-Pro)	Dipeptide
5.18	245.12918	C14H16N2O2	Cyclo(L-Phe-L-Pro)	Dipeptide
5.87	211.14438	C11H18N2O2	Cyclo(L-Leu-L-Pro)	Dipeptide

Formula deduced from the quasimolecular ion peak [M + H]⁺.