Antioxidant Activity and Phenolic Content of Oat as Affected by Cultivar and Location

Abstract

VAN, and avenanthramide contents. Concentration ranges of three of the avenanthramides were 21 to 62 mg Phenolic compounds in oat (Avena sativa L.) may have healthkg Ϫ1 , which were 10-to 30-fold greater than those of promoting effects on humans due to their antioxidant or other properties. The objective of this study was to determine the effects of cultivar the simple phenolics (FA, CA, PCA, and VAN), which and location on phenolic contents and antioxidant activities of alcohol-ranged from about 1.3 to 2.7 mg kg Ϫ1 . No information is soluble extracts from oat groats. Antioxidant activities (AOA) and available concerning environmental effects on phenolic concentrations of eight phenolic compounds having AOA were meacontents of oat. Genetic and environmental effects on sured in three cultivars grown at seven locations in Wisconsin during AOA of oat extracts have not been reported in the 1998. There were significant differences among cultivars for AOA, literature. The concentrations of tocols, which are concentrations of all of the phenolic compounds measured except known to have AOA, were significantly affected by p-coumaric and ferulic acids, and for total free phenolic contents genotype and location (Peterson and Qureshi 1993). (FPC). Location significantly affected the concentrations of five ofThe objective of this study was to evaluate the relative the phenolics and total FPC, but did not affect AOA. There were importance of cultivars, locations, and their interaction significant cultivar ϫ location interactions for the concentrations of avenanthramides and for total FPC. The unexpectedly high concentra-Abbreviations: AOA, antioxidant activity; ARL, Arlington; ASH,

Phenolic amides (avenanthramides) in oats - a review

“…They are constitutively expressed in the kernels, appearing in almost all milling fractions, but occur in the highest concentration in the bran and outer layers of the kernel (Peterson et al 2002;Jastrebova et al 2006;Meydani 2009). Their concentrations are affected by the genotype and growing environment, in one location the combined concentration of A, B and C having exceeded 300 mg/kg (Emmons & Peterson 2001;Peterson et al 2002). They have been reported to contribute to the fresh taste of products made from oats (Molteberg et al 1996).…”

Antioxidant Potential of Adiantum Aethiopicum L.

“…[13] They may act as antioxidants, reducing the risk of coronary heart diseases as well as they may protect against some forms of cancer. [14] The phenols also increase in response to abiotic stresses. These compounds are also famous for their chelating properties.…”

Content of Nutrients and Antioxidant Properties of Different Grain Fractions of Selected Oat Cultivars and Varieties

“…[31] wykazali, że otręby owsiane zawierają więcej polifenoli niż mąka z tego samego zboża. Emmons i Peterson [9] stwierdzili natomiast większą zawartość związków polifenolowych w nieobłuszczo-nym ziarnie owsa w porównaniu z ziarnem obłuszczonym. W owsie, jako jedynym zbożu, występują ponadto awentramidy.…”

“…Jest to grupa pochodnych kwasów cynamonowych (p-kumarowego, ferulowego i kawowego) i kwasu antranilowego, 5-hydroksyantranilowego i 5-hydroksy-4-metoksyantranilowego [33]. Grupa ta obejmuje co najmniej 25 różnych związków występujących w płatkach owsianych oraz 20 -w łusce [9].…”