POLYPHENOL CONTENT AND ANTIOXIDANT ACTIVITY OF COMMERCIAL BEERS FROM THE ROMANIAN MARKET

Abstract

The aim of this study is to evaluate the polyphenol content and antioxidant activity of 10 different samples from the Romanian market. The samples were purchased from the local market of
Suceava town, Suceava county. Polyphenolic compounds are ubiquitous in all plant organs and are, therefore,  an  integral  part  of  the  human  diet.  They  are  synthesised  by  the  phenylpropanoid biosynthetic  pathway,  which produces  the large  variety  of  plant  phenols. The  polyphenol  content  of the  beer samples  was  measured using  the  Folin  Ciocalteau method.  The  antioxidant  activity  of  beer samples  were  measured  using  the  DPPH  assay.  The  two  method  were applied  using  a  UV-VIS spectrometer.  The  10  beer  samples  analyzed  showed  considerable  differences  between  them  among total polyphenol content, ranging between 61.40 mg GAE/l for Landbier beer to 361.40 mg GAE/l for Skol beer. All the beer samples showed strong activities of the DPPH radical at the concentration test. The  values  of  PI%  are  rangind  between  10.24  and  33.68%.  Tuborg  beer  showed  the  highest antioxidant activity, while Landbier showed the smallest one.