Abstract
The colored corns are used as food as well as for feed in Asian countries; however, the active component of antioxidant activity in Korean colored corns has not been investigated. Thus, we measured the total content of carotenoids, phenols, flavonoids, and anthocyanins from 40 Korean colored corn genotypes for correlation analysis between antioxidant activity and these phytochemicals. The ferric reducing ability power (FRAP) and 2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) activity were measured in order to study this correlation. As a result, there was large variation in total anthocyanin (coefficient of variation, CV 85.0%) and total carotenoid contents (CV 87.8%), while CVs of total phenol, total flavonoid contents, ABTS and FRAP was relatively low (CV 15.0%, 22.8%, 15.5%, and 16.3% respectively). There were meaningful correlations between ABTS and anthocyanins, phenols, and flavonoids, as well as correlations between FRAP and phenols as well as FRAP and flavonoids. We also obtained a more informative and easily visualized result by using principal component analysis (PCA). Anthocyanins and carotenoids showed a large variation as compared to other compounds. Anthocyanins are a good target to increase antioxidant activity in colored corns.
Highlights
Corn is widely considered an important crop across the world
Anthocyanins and carotenoids showed a large variation as compared to other compounds
We assume that significant variation of Total Anthocyanin Content (TAC) can contribute to the antioxidant activity of Korean colored corn because the previous studies have reported that anthocyanins could considerably contribute to the antioxidant activity in corns, wine and the common fig (Žilić, Serpen, Akıllıoğlu, Gökmen, & Vančetović, 2012; Rivero-Perez, Muniz, & Gonzalez-Sanjose, 2008; Solomon et al, 2006)
Summary
Corn is widely considered an important crop across the world. Corn contains various antioxidant compounds such as anthocyanins, carotenoids, phenols, and flavonoids. Carotenoids are the precursor of vitamin A that can be converted to retinal They absorb damaging blue and ultraviolet light and act as antioxidants. Polyphenol and flavonoids are closely related with chemopreventive activity as ROS scavengers J. Lee, 2006; Moon, Wang, & Morris, 2006). Several studies have shown that an increased dietary intake of polyphenol and flavonoids correlates with reduced oxidative stress, inflammation, tumor, and coronary heart disease (Laranjinha, Almeida, & Madeira, 1994; Moon, Wang, & Morris, 2006; Poulsen, Prieme, & Loft, 1998)
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