Antioxidant activity, nutritional, and phenolic composition of sweet potato leaves as affected by harvesting period

SUAREZ, SANTIAGO E.; MU, TAI-HUA; SUAREZ, SANTIAGO E.; AÑÓN, MARÍA CRISTINA

International Journal of Food Properties

Taylor & Francis Group

Año: 2020 vol. 23 p. 168 - 178

1094-2912

In the present study, the nutritional and phenolic composition as well as the antioxidantactivityofsweetpotatoleaves(SPL)harvestedin3differentperiods weredeterminedandcompared.Furthermore,grayrelationalanalysiswasused to compare the comprehensive nutritional value. Results showed SPL HP1 had thehighestproteinvalue(30.8±0.4g/100gdw),whileSPLHP3hadthehighest content of vitamin C (104.6 ± 4.9 mg/100 g dw), vitamin E (5.8 ± 0.4 mg/100 g dw), total polyphenol content (9.1 ± 0.3 g/100 g dw), antioxidant activity (DPPH:7.4±0.1gVcE/100gdw;ABTS:10.6±0.7gVcE/100gdw;FRAP:0.617± 0.005 µmol TroloxE/100 g dw), and comprehensive nutritional value (weighted gray relational grade 0.8336). The individual phenolic composition showed the presence of six caffeoylquinic acids, caffeic acid, and two flavonoids (quercetin and isoquercetin), which were significantly different among different harvest periods. In conclusion, HP3 was an optimal period for harvesting SPL.