AUTHOR=Faiza Neelam , Imran Ali , Arshad Muhammad Umair , Arshad Muhammad Sajid , Shah Mohd Asif 

TITLE=Valorization and characterization of corn by-product polyphenols through green extraction technologies

JOURNAL=Frontiers in Nutrition

VOLUME=Volume 10 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2023.1107067

DOI=10.3389/fnut.2023.1107067

ISSN=2296-861X

ABSTRACT=The amount of food waste throughout the world has become quite alarming and is contributing to the lower resources of food. The study aimed to extract and characterize the polyphenols from corn silks at immature and mature stages through conventional and green extraction techniques. Purposely, corn silks the by-products of corn (Zea mays L.) were collected and subjected to the proximate analysis including moisture, ash, protein, fiber, and minerals. Secondly, the antioxidants from both immature and mature corn silks were extracted by techniques involving supercritical and ultrasound extraction alongside conventional extraction. The results displayed a promising quantity of protein and fiber along with calcium, magnesium, sodium potassium, and copper, respectively. Among the extraction techniques, supercritical extraction at 3000 Pa acquired the highest total phenolic contents (TPC), total flavonoids (TF), (2, 2-diphenylpicrylhydrazyl (DPPH), Ferric reducing antioxidant power (FRAP) activities as 128.08+3.74mg GAE/100 g, 86.73+2.75mg CE/100 g, 106.73±5.10%, and 73.52+2.33 μM Fe+2 /g, respectively followed by the ultrasound and conventional extraction techniques. Among the immature and mature corn silks the highest antioxidant activity was displayed by immature corn silks, respectively.