Phenolic Acid Profiles and Antioxidant Activity of Major Cereal Crops
2020
Horvat, Daniela | Simić, Gordana | Drezner, Georg | Lalić, Alojzije | Ledenčan, Tatjana | Tucak, Marijana | Plavšić, Hrvoje | Andrić, Luka | Zdunić, Zvonimir
Phenolic acids (PAs) are a dominant group of phenolic compounds in cereals, existing mostly bound to compounds of cell wall. In this study, a total of 25 cereal grain samples, including wheat, winter and spring barley, corn, and popcorn, were evaluated for bound PAs and antioxidant activity in a two-year field trial. The PA contents, determined by HPLC, were significantly affected by cereal type. The mean total PA content was highest in popcorn and corn (3298 and 2213 μg/gdₘ, respectively₎, followed by winter and spring barley (991 and 908 μg/gdₘ, respectively) and wheat (604 μg/gdₘ). Ferulic acid was the most abundant, accounting from 62% to 83% of total PAs (in popcorn and winter and spring barley, respectively). Across cereals, p-coumaric (35–259 μg/gdₘ) and p-hidroxybenzoic (45–79 μg/gdₘ) were also dominant, while in corn and popcorn o-coumaric (71 and 89 μg/gdₘ, respectively) also occurred in higher content. The mean total phenol content ranged from 853 μg GAE/gdₘ (wheat) to 1403 μg GAE/gdₘ (winter barley) with DPPH scavenging activity from 14% to 67%, respectively. A significant influence of crop years on the ferulic acid and total PA content was found, while the variability of other PAs was dependent on the cereal type. The results indicated a high health benefit potential of selected cereals.
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