Abstract
Total polyphenol, antioxidant activity, and heavy metal contents in selected Ethiopian beers (Dashen= B1, Harar = B2, Habesha= B3, Saint George= B4, and Walya= B5) were investigated. The average concentration of total phenolic content in B1, B2, B3, B4, and B5 were found to be 219.80, 206.09, 190.24, 193.00, and 212.10 mg GAE/L, respectively. The obtained results showed that B1 contained significantly highest total polyphenol content (219.80±2.83 mg/L) and showed the highest radical scavenging capacities (84.16±0.65). According to Pearson’s correlation between polyphenol extract with antioxidant activities, suggested that phenolic compound in beer were contributor to antioxidant activity. Similarly, all the beer samples were analyzed for Cd, Cr, Cu, Ni, and Pb with flame atomic absorption spectrophotometer. The total metal concentrations of Cd, Cr, Cu, Ni, and Pb were found to be in the range of (ND–0.022 mg/L), (0.02 −0.041), (0.023-0.054), (ND-0.064), and (ND-0.022 mg/L), respectively. The efficiency of the procedure was validated by spiking and the percent recovery of the metals varied from 90.9 to 104.3%.
Highlights
Beer is the third most popular beverage in the world next to tea and water [1]
Polyphenols arise from the raw materials such as malt and hops during brewing process, which play a key role in antioxidant activity and they can influence the flavor, color and sensory stability of the beer [5, 6]
The physicochemical properties of Ethiopian commercial beers are described in the Table 2
Summary
Beer is the third most popular beverage in the world next to tea and water [1]. In recent decades, beer consumption has been steadily increasing even in countries where alcoholic beverages are not traditional. Since beer is brewed from water, yeast, malt, and hops, beer contains a broad range of different chemical components that may react and interact at all stages of the brewing process [2]. As long as beer is consumed moderately in responsible manner, it can have significant effect on human health as a source of essential vitamins (B2, B6 and B12), carbohydrates, amino acids, phenolic compounds and minerals [3]. Many studies have shown that regular consumption of foods and beverages abundant in polyphenols have antibacterial, antifungal, anti-inflammatory, antitumor activities and prevent diseases related to aging [4]. Polyphenols arise from the raw materials such as malt and hops during brewing process, which play a key role in antioxidant activity and they can influence the flavor, color and sensory stability of the beer [5, 6]
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