Insights into Streptomyces spp. isolated from the rhizospheric soil of Panax notoginseng: isolation, antimicrobial activity and biosynthetic potential for polyketides and non-ribosomal peptides

Table 2 The secondary metabolites from the selected isolate SYP-A7257 analyzed by LC-MS

No.	Retention time (min)	Molecular formula	Ion molecular formula	m/z	m/z (Calc)	Deviation (ppm)	Compound	UV (CH₃CN-H₂O) (nm)	Structural class	Reference (s)	Activity
F5	25.688	C₃₃H₅₃O₁₂	C₃₃H₅₄NaO₁₂	665.3505	665.3507	0.37	1′, 14-Dihydroxyisochainin	325, 340, 360	polyene macrolides	[31]	antifungal
F6	28.963	C₃₅H₅₇O₁₃	C₃₅H₅₈NaO₁₃	709.3771	709.377	−0.19	hydrofungichromin	325, 340, 360	polyene macrolides	New compound	ND
F2	31.555	C₃₅H₅₇O₁₂	C₃₅H₅₈NaO₁₂	693.3818	693.382	0.36	fungichromin	325, 340, 360	polyene macrolides	[32]	antifungal
F3	40.872	C₆₂H₈₅N₁₂O₁₇	C₆₂H₈₆N₁₂NaO₁₇	1293.6149	1293.6126	−1.77	Actinomycin X_0β	241, 446	PKS-NRPS hybrid	[33]	antibacteria
F1	42.672	C₆₂H₈₄N₁₂O₁₇	C₆₂H₈₅N₁₂O₁₇	1269.6146	1269.615	0.33	Actinomycin X2	241, 446	PKS-NRPS hybrid	[33]	antibacteria
F4	43.398	C₆₂H₈₅N₁₂O₁₆	C₆₂H₈₆N₁₂NaO₁₆	1277.6161	1277.6177	−4.39	Actinomycin D	241, 446	PKS-NRPS hybrid	[33]	antibacteria

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