Extraction of Soluble Phenols and Flavonoids from Native Mexican Pigmented Corn Kernel Powder by Ultrasound: Optimization Process Using Response Surface Methodology

Author:

Hernández-Estrada Salvador1ORCID,Anaya-Esparza Luis Miguel2ORCID,González-Torres Sughey1ORCID,Hernández-Villaseñor Luis Alfonso1,Gómez-Rodríguez Víctor Manuel1ORCID,Ramírez-Vega Humberto1,Villagrán Zuamí1ORCID,Ruvalcaba-Gómez José Martín3ORCID,Rodríguez-Barajas Noé1ORCID,Montalvo-González Efigenia4ORCID

Affiliation:

1. Centro Universitario de los Altos, Universidad de Guadalajara, Tepatitlán de Morelos 47620, Mexico

2. Centro de Estudios para la Agricultura, la Alimentación y la Crisis Climática, Centro Universitario de los Altos, Universidad de Guadalajara, Tepatitlán de Morelos 47620, Mexico

3. Centro Nacional de Recursos Genéticos, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Tepatitlán de Morelos 47600, Mexico

4. Laboratorio Integral de Investigación en Alimentos, Tecnológico Nacional de México/Instituto Tecnológico de Tepic, Tepic 63175, Mexico

Abstract

This study focused on optimizing ultrasound-assisted extraction (UAE) conditions (XPC: pulse cycle of 1:1, 2:1, and 3:1 s on/off; XUP: ultrasound power of 80, 90, and 100%; and XET: extraction time of 2, 4, and 6 min) for maximizing the content of soluble phenols (TSPs) and flavonoids (FLAs) from a native Mexican pigmented corn kernel powder through response surface methodology (RSM). Under the Box–Behnken design conditions, the UAE of TSPs ranged from 27.72 to 34.87 mg/g, while FLA content ranged from 16.59 to 27.28 mg/g. The highest content for TSPs was under 4 min XET, 1:1 s on/off XPC, and 100% XUP, while for flavonoids it was under 6 min XET, 2:1 s on/off XPC, and 80% XUP. According to RSM analysis, the optimal UAE conditions for TSPs were found to be XET 3.15 min, 1.58 s on/off XPC, and 100% XUP, and an XET of 4.18 min, 3 s on/off XPC, and 80% XUP were the best experimental conditions for FLAs with a predictive TSP of 35.07 mg/g and FLA of 27.51 mg/g. These data were adjusted in a second-order polynomial model and experimentally validated (TSP = 34.06 mg/g and 27.04 mg/g). Furthermore, the extracts demonstrated antioxidant activity (ABTS, FRAP, and DPPH methods) for optimal UAE for TSPs and FLAs. The antioxidant extract from the native Mexican pigmented corn kernel powder can be used for diverse industrial applications. Thus, the UAE is an effective and sustainable technology for recovering bioactive compounds from maize-based materials.

Publisher

MDPI AG

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