. 2020 May 27;25(11):2474. doi: 10.3390/molecules25112474

Table 3.

HPLC-ESI/MS identification of phenolic compounds for guava seed oil.

Peak No.	T_R (min)	TIC	Exact Mass (g/mol)	Molecular Formula	Observed Mass (m/z)	Error (%)	Possible Constituents/Compounds	References
1	9.47	153000	192.1	C₇H₁₂O₆	[M − H]⁺ 194.1	1.03	Quinic acid	[25]
2	10.11	174000	354.3	C₁₆H₁₈O₉	[M − H]⁺ 354.9	0.17	O-Caffeoylquinic acid	[25,26]
3	12.64	185000	290.3	C₁₅H₁₄O₆	[M − H]⁺ 298.9	2.88	Catechin	Authentic standard
4	13.48	152000	432.1	C₂₁H₂₀O₁₀	[M − H]⁺ 433.3	0.23	Apigenin-4-O-glycoside	[27,28]
5	14.02	254000	496.2	C₂₁H₂₁O₁₄	[M − H]⁺ 497.2	0.2	Ellagic acid-O-methoxyglucoside	[29,30]
6	14.69	254000	342.3	C₁₈H₁₄O₇	[M − H]⁺ 342.9	0.15	Dicaffeic acid	[26,28]
7	16.11	649000	464.1	C₁₅H₁₀O₇	[M − H]⁺ 454.3	2.15	isoquercetin	Authentic standard
8	17.22	318000	Unknown	Unknown	ND	ND	Unknown	-
9	21.04	160000	452.1	Unknown	[M − H]⁺ 453.2	0.27	O-Caffeoylquinic acid derivative	[25]
10	25.84	129000	Unknown	Unknown	[M − H]⁺ ND	ND	Unknown	-
11	29.53	138000	302.2	C₁₄H₆O₈	[M − H]⁺ 302.5	0.1	Ellagic acid	[31,32]
12	31.15	306000	288.25	C₁₅H₁₂O₆	[M − H]⁺ 297.0	2.95	Eriodictyol	Authentic standard
13	32.32	543000	594.5	C₂₇H₃₀O₁₅	[M − H]⁺ 595.5	0.17	Luteolin-7-O-rutinoside	[24]
14	32.99	379000	302.2	C₁₅H₁₀O₇	[M − K]⁺ 340.3	0.26	Quercetin	Authentic standard
15	34.47	261000	382.0	C₁₇H₁₈O₁₀	[M − H]⁺ 383.3	0.34	Caffeoyl-glycosides or cinnamoyl glycosides	[26]
16	35.09	180000	516.45	C₂₅H₂₄O₁₂	[M − H]⁺ 517.3	0.16	di-O-Caffeoyquinic acid	[26]