Table 1.
Chemical profile of the identified compounds in the Costa Rican guava ethyl acetate fraction.
| Compound numbera | Retention time (min) | Concentration (mg/g of dry extract) | UV data (λmax) | Marker ion exact mass (ppm) | Selected fragmental ion exact masses [adduct molecular ions-neutral molecules or radicals]+,− (molecular formula, ppm) | Identification |
|---|---|---|---|---|---|---|
| 1 | 12.7 | 205 | 221.0649 [M+H]+ (C8H13O7, −5.4) | 243.0492 [M+Na]+ (C8H12O7Na, 4.5); 463.1057 [2M+Na]+ (C16H24O14Na, −1.5) 219.0480 [M−H]− (C8H11O7, −11.4); 265.0540 [M−H+HCOOH]− (C9H13O9, −7.5); 439.1057 [2 M−H] − (C16H23O14, −7.1) |
1,5-Dimethyl citrate | |
| 2 | 15.0 | 224, 300 | 333.0946 [M+Na]+ (C15H18O7Na, −1.2) | 643.2001 [2M+Na]+ (C30H36O14Na, −0.3) 355.1011 [M−H+HCOOH]− (C16H19O9, −5.1) |
1-O-trans-Cinnamoyl-β-D-glucopyranose | |
| 3 | 17.1 | 10.5 | 254, 364 | 300.0073 [M−H] − (C14H5O8, −3.7) | 603.0048 [M−H+HCOOH]− (C28H11O16, 0.2) | Ellagic acid |
| 4 | 17.4 | 1.1 | 254, 370 | 317.0280 [M−H] − (C15H9O8, −5.4) | 319.0465 [M+H]+ (C15H11O8, 3.4); 635.0687 [2 M−H]− (C30H19O16, 0.5) | Myricetin |
| 5 | 18.2 | 265, 365 | 415.1219 [M−H+HCOOH]− (C18H23O11, −5.1) | 393.1161 [M+Na]+ (C17H21O9Na, −0.3) | Sinapic aldehyde 4-O-β-D-glucopyranoside | |
| 6 | 18.9 | 5.8 | 250, 365 | 551.1033 [M−H+HCOOH] − (C24H23O15, −0.7) | 507.1158 [M+H]+ (C23H23O13, 3.7); 529.0938 [M+Na]+ (C23H22O13Na, −3.8); 345.0554 [M+H-glucosyl group]+ (C17H13O8, −16.2) 343.0470 [M−H–glucosyl group]− (C17H11O8, 4.7) |
3,3′,4-Tri-O-methylellagic acid-4′-O-D-glucopyranoside |
| 7 | 20.9 | 6.0 | 257, 353 | 449.1099 [M+H]+ (C21H21O11, 3.3) | 493.0970 [M−H+HCOOH] − (C22H21O13, −2.4) | Quercitrin |
| 8 | 22.0 | 250, 365 | 445.1501 [M+H]+ (C23H25O9, 0.4) | 443.1326 [M−H] − (C23H23O9, −3.6) | 1,3-O-Diferuloylglycerol | |
| 9 | 22.9 | 9.2 | 254, 367 | 301.0366 [M−H]− (C15H9O7, 6.0) | 303.0534 [M−H]+ (C15H11O7, 9.6) | Quercetin |
a
Compounds numbers and retention times refers to the numbers given in Fig. 4.