## 3 Results
### UPLC-ESI-DAD-MS/MS Peel Extract Analyses  
The UPLC-DAD and UPLC-ESI-MS profiles of _S. odorifera_ fruits are depicted in Table 1. The UPLC-MS analyses allowed the detection of 14 main compounds; 12 of them were tentatively identified, including five anthocyanin derivatives, five flavonoids derivatives, two flavonol aglycones, and two unidentified compounds. The assignments were based on the fragmentation patterns, UV\({}_{\text{max}}\) absorption, and retention time (Rf), making comparisons with the literature data when available. The tentative identification of polyphenols from _S. odorifera_ through UPLC-ESI-MS/MS was performed. The UPLC-MS analysis in positive ion mode allowed the detection of five anthocyanins. The compounds **1**, **2**, and **3** showed the same MS/MS base peak at _m/z_ 287 and UV absorption around 500 nm, in agreement with a cyanidin core. Of them, two (**1** and **3**) exhibited the same [M+H]\({}^{+}\) in at _m/z_ 595. Compound **1** displayed one neutral loss of one rutinose (308 amu), while the last one (**3**) lost one rhamnose (146 amu) and one hexose (162 amu). Finally, compound **2** lost a hexose moiety (162 amu) from its pseudo molecular ion at _m/z_ 449. Therefore, compounds **1**, **2**, and **3** were tentatively assigned as cyanidin rutinoside, cyanidin hexoside, and cyanidin hexoside rhamnoside, respectively. Peak **4** displayed a [M+H]\({}^{+}\) ion at _m/z_ 579. Consecutive neutral losses consisting of one rhamnose (146 amu) and one hexose (162 amu) yielded the base peak at _m/z_ 271 compatible with a pelargonidin core. Thus, compound **4** was tentatively identified as pelargonidin hexoside rhamn. Compound **5** was tentatively assigned as malvidin rhamnoside shikimate, based on the successive neutral losses of one rhamnose (146 amu) and one shikimoyl moiety (156 amu) leading to the MS\({}^{2}\) fragment at _m/z_ 331, suggesting a malvidin core [40]. In negative ion mode, five flavonoid derivatives were detected. The peaks **6**, **7**, and **9** showed an intense fragment ion at _m/z_ 301 as well as UV maxima around 350 nm, suggesting a quercetin core. Compound **6** displayed a [M-H]\({}^{-}\) ion at _m/z_ 609 with a neutral loss of a rutinose (308 amu). Both peaks **7** and **9** with [M-H]\({}^{-}\) ions at _m/z_ 463 and 563, respectively, showed a neutral loss of one hexose (162 amu). The last one (**9**) also lost a succinate moiety (100 amu). Therefore, compounds **6**, **7**, and **9** were tentatively identified as quercetin rutinoside (**6**), quercetin hexoside (**7**), and quercetin hexoside succinate (**9**), respectively. In addition, two kaempfer derivatives were tentatively assigned. Peak **8** and **10** showed a pseudomolecular ion at _m/z_ 593 and 447, respectively. The first (**8**) showed a neutral loss of a rutinose (308 amu), while peak **10** lost a hexose moiety (162 amu), yielding an intense MS\({}^{2}\) fragment at _m/z_ 285 in both cases. This MS\({}^{2}\) ion and the UV maxima around 345 nm suggest a kaempfer core. Thus, compound **8** was tentatively assigned as kaempfer rutinoside and compound **10** as kaempfer hexoside. Finally, two flavonol aglycones were detected in the samples. Peak **11** showed an intense signal, with a pseudomolecular ion at _m/z_ 301, leading to the MS\({}^{2}\) fragments at _m/z_ 255, 177, and 151, suggesting a quercetin core. Compound **13** also showed a [M-H]\({}^{-}\) ion at _m/z_ 285 with MS\({}^{2}\) fragments at _m/z_ 256, 239, and 229, indicating a kaempfer core [41]. Both peaks showed UV absorption around 365-369 nm supporting the assignments. Therefore, compounds **11** and **13** were tentatively identified as quercetin and kaempfer olyscones. The \"kurugua\" fruit is a food resource with great potential. The cultivation of this fruit is undervalued, and its nutritional contribution can be better used to comply with daily nutritional recommendations. This native fruit adapted as a crop can contribute to sustainable development objectives in terms of poverty reduction and food security