Skip to main content

Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Table 5 Assignment of the characteristic peaks

From: Chemical compositions, chromatographic fingerprints and antioxidant activities of Citri Exocarpium Rubrum (Juhong)

No. RT (min) UV (nm) MS in neg. mode MS in pos. mode MS2 in neg. mode MS2 in pos. mode Assignment References
1 15.2 283 / / / / Unknown /
2 18.3 282 / / / / Naringin /
3 19.2 253, 347 607 [M–H] 609 [M+H]+ 299 [M-Rutinosyl–H] 301 [M-Rutinosyl+H]+ Unknown /
     631 [M+Na]+     
     463 [M-Rhamnosyl+H]+     
     301 [M-Rutinosyl+H]+     
4 20.1 283 609 [M–H] 611 [M+H]+ 301 [M-Rutinosyl–H] 303 [M-Rutinosyl+H]+ Hesperidin [7, 19]
    1219 [2M–H] 1243 [2M+Na]+ 286 [M-Rutinosyl–CH3–H] 285 [M-Rutinosyl-H2O+H]+   
     465 [M-Rhamnosyl+H]+ 257 [M-Rutinosyl–CO2–H] 270 [M-Rutinosyl–H2O–CH3+H]+   
     303 [M-Rutinosyl+H]+ 242 [M-Rutinosyl-CO2-CH3-H] 195 [M-Rutinosyl–C6H4O2+H]+   
      134 [M-Rutinosyl-CO2–CH3–C6H4O2–H] 177 [M-Rutinosyl–C6H4O2–H2O+H]+   
5 23.3 283 609 [M–H] 611 [M+H]+ / / Neohesperidin /
     633 [M+Na]+     
     465 [M-Rhamnosyl+H]+     
     303 [M-Rutinosyl+H]+     
6 32.4 254, 347 723 [M–H] 725 [M+H]+ 417 [M-306–H] 419 [M-306+H]+ Unknown /
695 [M–CO–H] 747 [M+Na]+   
7 36.5 210, 257, 342 / / / / Unknown /
8 40.3 203, 269, 345 / 373 [M+H]+ / 343 [M–CH2O+H]+ Unknown /
     395 [M+Na]+     
     358 [M–CH3+H]+     
     343 [M–CH2O+H]+     
9 42.2 206, 253, 270, 355 / 403 [M+H]+ / 373 [M–CH2O+H]+ Unknown /
     425 [M+Na]+     
     388 [M–CH3+H]+     
     373 [M–CH2O+H]+     
10 43.6 214, 241, 330 / 373 [M+H]+ / 343 [M–CH2O+H]+ Sinensetin [20, 21]
     395 [M+Na]+   312 [M–H2O–CO–CH3+H]+   
     767 [2M+Na]+   297 [M–H2O–CO–CH2O+H]+   
     358 [M–CH3+H]+     
     343 [M–CH2O+H]+     
     312 [M–H2O–CO–CH3+H]+     
11 43.7 270, 295, 341 / 343 [M+H]+ / 313 [M–CH2O+H]+ Tetramethyl-O-isoscutellarein [20]
     707 [2M+Na]+   285 [M–CH2O–CO+H]+   
     328 [M–CH3+H]+     
     313 [M–CH2O+H]+     
     285 [M–CH2O–CO+H]+     
12 46.3 208, 336 / 403 [M+H]+ / 388 [M–CH3+H]+ Hexamethoxyflavone [21]
     373 [M–CH2O+H]+   373 [M–CH2O+H]+   
       355 [M–CH2O–H2O+H]+   
       327 [M–CH2O–H2O–CO+H]+   
13 47.1 333 / 403 [M+H]+ / 388 [M–CH3+H]+ Nobiletin [7, 20, 22]
     388 [M-CH3+H]+   373 [M–CH2O+H]+   
     373 [M-CH2O+H]+   343 [M–2CH2O+H]+   
       313 [M–3CH2O+H]+   
       283 [M–4CH2O+H]+   
       239 [M–C10H12O2+H]+   
       211 [M–C10H12O2–CO+H]+   
14 47.7 266, 322 / 343 [M+H]+ / 313 [M–CH2O+H]+ Tetramethyl-O-scutellarein [20]
     365 [M+Na]+   299 [M–CO2+H]+   
     328 [M-CH3+H]+     
     313 [M-CH2O+H]+     
15 50.1 253, 343 / 433 [M+H]+ / 403 [M–CH2O+H]+ 3,5,6,7,8,3′,4′-Heptamethoxyflavone [7, 20]
     455 [M+Na]+   373 [M–2CH2O+H]+   
     496 [M+Na+CH3CN]+   345 [M–2CH2O–CO+H]+   
     418 [M-CH3+H]+     
     403 [M-CH2O+H]+     
16 51.8 270, 323 / 373 [M+H]+ / 343 [M–CH2O+H]+ Tangeretin [7, 20, 22]
     395 [M+Na]+   283 [M–3CH2O+H]+   
     358 [M-CH3+H]+   312 [M–CH3–H2O–CO+H]+   
17 56.5 203, 254, 282, 341 / 389 [M+H]+ / 374 [M–CH3+H]+ 5-Hydroxy-6,7,8,3′,4′-pentamethoxyflavone [7]
     411 [M+Na]+   359 [M–CH2O+H]+   
     374 [M-CH3+H]+     
     359 [M-CH2O+H]+