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Flavonoid type soluble phenolics and antioxidant capacity in creole pigmented maize (Zea mays) genotypes

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Authors: V.L. Quintanilla‑Rosales, K. Galindo‑Luna, F. Zavala‑García, J.A. Pedroza‑Flores, J.B. Heredia, V. Urías‑Orona, M.D. Muy‑Rangel y G. Niño‑Medina
Issue: 113-4 (325-334)
Topic: Plant Production
Keywords: Total flavonoids, condensed tannins, total anthocyanins, DPPH, ABTS, Zea mays

The content of flavonoid type soluble phenolic compounds in terms of total flavonoids (AlCl3‑NaNO2‑NaOH), condensed tannins (vanillin‑H2SO4) and total anthocyanins (extract absorbance at 535 nm, pH=1) was evaluated. In addition the antioxidant capacity was also evaluated based on the absorbance reduction of the DPPH (2,2‑diphenyl‑1‑picrylhydrazyl) and ABTS (2,2?‑Azino‑bis(3‑ethylbenzothiazoline‑6‑sulfonic acid)) reagents in five creole pigmented maize genotypes: Ejido La Soledad Arramberri (ELSA), Ejido Refugio Zaragoza (ERZ), La Siberia Zaragoza (LSZ), Morado Oaxaca (MO) y Tepozanes II (TZII). The content of total flavonoids, condensed tannins and total anthocyanins ranged from 5709 to 7418 milligrams catechins equivalents per kilogram (mgCatE/kg), from 798 to 1322 mgCatE/kg and from 338 to 513 milligrams cyaniding‑3‑glucoside per kilogram (mgC3GE/kg), respectively. Regarding to the antioxidant capacity, in terms of Trolox equivalents levels were from 23.00 to 27.88 millimoles Trolox equivalents per kilogram (mmolTE/kg) and 14.97 to 18.12 mmolTE/kg in DPPH and ABTS respectively, while in terms of inhibition percentage levels were from 17.44 to 21.31 percentage inhibition (%Inh) and from 22.97 to 27.22 %Inh in DPPH y ABTS respectively. Genotype TZII showed the highest levels in the total flavonoids and DPPH and ABTS antioxidant capacity, while ELSA and MO genotypes showed the highest levels of condensed tannins and total anthocyanins, respectively.

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