Specifically, [C9H8N] + appeared at 10.3 min with rdb = 6.5 was presumed to be quinolone; [C16H34NO]+ (at 14.4 min) with rdb = 0.5 and [C25H50NO2]+ (at 23.5 min) with rdb = 1.5 possibly contained an amino-group.
For example, [C12H26NO]+ (at 8.0 min), [C7H16NS2]+ (at 19.1 min), [C9H18NS2]+ (at 20.0 min), [C18H36NO] + (at 23.5 min), of which rdb was smaller than 3.5, may be O- or S- aliphatic amines; [C14H22NOS]+ detected at 19.7 min with rdb = 4.5 may contain a pyridine/thiophene/phenyl ring with substituent group.
For example, [C20H32NO2S2]+ (peak 5 at 13.3 min in Fig. 3a), with rdb = 5.5, may be unsaturated ketones, but it fluoresced at 290 nm indicated that it was aromatic structure.
The proposed structure of compound with rdb = 5.5 ([C35H63N2]+ at 21.4 min in Fig. 2a,) was indole or a pyridine or an aniline with an amino group as well as alkylated-benzimidazole.
In N2 group, the species with rdb = 4.5, like [C20H35N2]+ appeared at 21.6 min in Fig. 2a, may be a pyridine or an aniline with an amino group, unsaturated amine was also possible.
For species with rdb = 8.5, [C12H10N]+, [C13H12N]+ and [C14H14N]+ (at 18.5, 19.9 and 20.9 min, in Fig. 2b, respectively) may consist of an indenopyridine ring/carbazole ring/benzindole ring, besides an aniline ring and phenhylpyridine ring.
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Species with rdb > 8.5 may contain a benzoquinoline or acridine ring with an amino group besides quinoline and indole rings connected by a bridged bond, for example, [C25H22NO2]+ (at 12.5 min in Fig. 3a) with rdb = 15.5 may consists of phenyls-pyridines or ester-quinoline and so on, estimating C25H21NO2 fluoresced at longer than 400 nm shown in Fig. 4a.
All of their ions sturctures ([C10H10N]+ with rdb = 6.5, [C15H12N]+ with rdb = 11.5 and [C25H22NO2]+ with rdb = 15.5) were supposed above shown in Fig. 4a, proving that CWSFS result was consist with rdb conjecture.
The compounds with rdb = 6.5 may be quinolones.
The species with rdb = 3.5 may be pyridines or anilines.
