Table 3. APC mass-spectra in positive ion detection mode “m/z” and absorbance maximum (nm) for detected compounds.

Peak no.	RT (min)	Compound	“m/z” (+)	λmax (nm)
1	5.2	Unknown	313.8
2	5.3	Unknown	268
3	5.4	Unknown	151
4	10.2	Feruloylputrescinea	265/177	292/317
5	10.5	HCAb	386/195/177	325/230
6	12.5	HCAb	386/195/177	325/231
7	14.1	HCAb	386/195/177	328/234
8	14.4	6,8-di-C-Glucosylapigenina	595/577/559/541	271/335
9	16.1	HCAb	386/195/177	328/234
10	18.5	Unknown	595
11	19.4	Unknown	573
12	19.5	2′′-O-xylosylvitexina	565/433/415/397	268/337
13	20.2	Unknown	565
14	20.3	Unknown	595
15	20.5	Flavanone-O-rutinosideb	611/465/303
16	21.2	Luteolin-7-O-rutinosidea	595/595/449/287	255/266sh/348
17	22.1	8-C-glucosyldiosmetina	463/445/427	254/266/348
18	24.4	Flavone-O-rutinosideb	609/463/301
19	25.8	Diosmina	609/463/301	253/267/347
20	26.3	Hesperidina, PCA	611/465/449/303	283/331
21	29.1	Flavanone-O-rutinosideb	611/465/303
22	32.2	Isosakuranetin rutinosidea	595/449/287	283/331
23	33.5	Unknown	728
24	33.5	Unknown	359
25	34.1	Unknown	713
26	34.4	Unknown	359
27	35.2	Unknown	359
28	35.3	Unknown	331
29	36.1	Isosinensetina	373	249/270/342
30	37.1	DesmethylPMFb	389
31	37.6	Sinensetina, PCA	373	243/264/333
32	38.4	DesmethylPMFb	345
33	39.4	Nobiletina	403	249/270/334
34	40.1	Tetramethyl-O-Scutellareina	343	265/322
35	40.2	Unknown	375
36	40.5	Heptamethoxyflavonea	433	254/270sh/341
37	41.3	DesmethylPMFb	359
38	41.5	Tangeretinb	373	271/321
39	42.3	DesmethylPMFb	359
40	43.2	5-Desmethylnobiletina	389

^aIdentified by matching their retention time, mass spectra, and UV spectra with known standard. The UV spectra were further compared to earlier published spectra [18].

^bTentatively identified using +APCI-MS fragmentation patterns.