UPLC-ESI-QTOF-MS2-Based Identification and Antioxidant Activity Assessment of Phenolic Compounds from Red Corn Cob (Zea mays L.)

Hernández, María y Ventura, Janeth y Castro, Cecilia y Boone, Víctor y Rojas, Romeo y Ascacio Valdés, Juan y Martínez Ávila, Guillermo Cristian Guadalupe (2018) UPLC-ESI-QTOF-MS2-Based Identification and Antioxidant Activity Assessment of Phenolic Compounds from Red Corn Cob (Zea mays L.). Molecules, 23 (6). pp. 1-10. ISSN 1420-3049

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Resumen

Abstract: In this study, the extraction of phenolic antioxidants from red corn cob was carried out usingultrasound-assistedextraction(UAE).Thesolid:liquidratioandextractiontimewereevaluated when obtaining these bioactive compounds. The total phenolic contents were evaluated using the Folin Ciocalteu method, while the antioxidant activity was measured by ABTS•+ and DPPH• assays. The amount of phenolic compounds ranged from 215.17±33.49 to 527.33±103.79 GAE mg/100 g and, overall, high solid:liquid ratios and time periods release more phenolic compounds. Moreover, theredcorncobextractsshowedhigherradicalscavengingcapacityaccordingtotheresultsobtained usingtheABTS•+ techniquecomparedtotheDPPH• test. Thecouplingofliquidchromatographyand mass spectrometry assay allowed the determination of 11 phenolic compounds, including phenolic acidsandflavonoids. Thus,ourresultsdemonstratedforthefirsttimethepotentialofredcorncobas asourceofbioactivecompounds,whichmightbeincludedinfoodandpharmacologicalpreparations. Keywords: phenols compounds; red corn cob; ultrasonic-assisted extraction; UPLC-MS2

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