Brown beer vinegar: A potentially functional product based on its phenolic profile and antioxidant activity

Main Article Content

Elena Mudura
http://orcid.org/0000-0003-2928-5137
Teodora Emilia Coldea
http://orcid.org/0000-0002-0477-8659
Carmen Socaciu
http://orcid.org/0000-0002-7352-5057
Floricuța Ranga
Carmen Rodica Pop
http://orcid.org/0000-0002-7798-3397
Ancuta Mihaela Rotar
http://orcid.org/0000-0002-4544-5754
Antonella Pasqualone
http://orcid.org/0000-0001-6675-2203

Abstract

The aim of the present study was to create a functional, enriched in polyphenols and free of alcohol product obtained by acetic fermentation of beer. Beer and vinegar were tested first for their phenolic content and anti­oxidant activity, by the Folin Ciocalteu and the free radical scavenging acti­vity by the 1,1-diphenyl-2-picrylhydrazyl free-radical scavenging assay, res­pect­ively. Then, the separation and identification of the 30 phenolic com­pounds was realized by high-performance liquid chromatography coupled with positive electrospray ionisation and diode array detection (HPLC-DAD–ESI(+)-MS) analysis. Identification of the phenolic compounds data was realized based on the UV spectra of each compound. Based on a calibration curve (R2 = 0.9985), the amounts of the phenolic compounds, expressed as mg cathechin equivalents (CE)/L, were calculated. The total phenolic content of the beer and vinegar samples determined using Folin–Ciocalteu reagent were of 428.9±1.58 and 661.5±7.69 mg GAE L-1, respectively, which contributed to the high anti­oxid­ant activity in the vinegar sample of 82.18 %. Statistically significant differ­ences were observed after acetic fermentation between each parameter (p < 0.05). Brown beer vinegar represents a rich source of polyphenols and phenolic deriv­atives, compared to beer. By its increased phenolic content and antioxidant activity, brown beer vinegar could be considered another source of valuable compounds to beer, which could also be of interest in special diets. 

Article Details

How to Cite
[1]
E. Mudura, “Brown beer vinegar: A potentially functional product based on its phenolic profile and antioxidant activity”, J. Serb. Chem. Soc., vol. 83, no. 1, pp. 19-30, Feb. 2018.
Section
Biochemistry & Biotechnology

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