Evaluation, Characterization of Fiber Content, and Antioxidant Activity of Corncob (Zea mays L.) during Alkalization

  • Edi Suryanto Department of Chemistry, Faculty of Mathematics and Natural Science, Sam Ratulangi University
  • Mercy I.R. Taroreh Department of Food Science and Technology, Faculty of Agricultural, Sam Ratulangi University

Abstract

Corncob fiber powder was prepared by alkaline process, and their effects were investigated on the composition, physicochemical, and antioxidant properties of dietary fiber (DF) products. DF content was determined using AOAC enzymatic-gravimetric analysis,
while chemical composition in fiber was observed on
cellulose, hemicellulose, and lignin. The results showed that cellulose content of significantly increased while hemicellulose and lignin was observed decreasing. Correspondingly, content of the insoluble, soluble, and total DF of corncob was increased by 14.72-20.77, 28.86-47.43, and 15.12-21.42%, respectively. Furthermore, the particle size of DF is distributed in a range from 58.50-83.90 µm. XRD analysis showed the characteristics of cellulose that exhibited increasing crystalline degree from 29.33% to 53.53% and 59.62%, respectively. FTIR shows that the DF matrix structure does not change and in the presence of special structures of cellulose compounds. The SEM results showed that the alkaline process could significantly decrease the particle size and influence on the physicochemical and functional properties of corncob insoluble DF. The results also showed that DF extract has lower DPPH radical scavenging activity. The results suggest that corncob DF have good potential candidate for dietary fiber containing antioxidant ingredient and for their further applications in food.
Published
2022-07-21
How to Cite
SURYANTO, Edi; TAROREH, Mercy I.R.. Evaluation, Characterization of Fiber Content, and Antioxidant Activity of Corncob (Zea mays L.) during Alkalization. Molekul, [S.l.], v. 17, n. 2, p. 165-175, july 2022. ISSN 2503-0310. Available at: <http://jos.unsoed.ac.id/index.php/jm/article/view/5179>. Date accessed: 02 dec. 2022. doi: https://doi.org/10.20884/1.jm.2022.17.2.5179.
Section
Articles