Potencial antioxidante e atividade vasodilatadora de cervejas comerciais
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2017-05-05
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Universidade Federal de Goiás
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Beer is one of the oldest and most popular beverages consumed by mankind, the main classification of beers is the type of fermentation, divided into ale or lager, high and low fermentation, respectively. In this study, beer samples were divided into two portions, the first one for the spectrophotometric and electrochemical tests, which was used in natura form. And the second part was lyophilized, aiming at the concentration use standardization, alcohol withdrawal and guaranteeing an increase of durability, and then used in the pharmacological and chromatographic tests. The aim of this study was to investigate the antioxidant potential and vasodilator activity and correlate them with the phenolic profiles of twenty-two commercial beers. In addition, the antioxidant activity and the phenolic profile of hops and malts from different origins were also verified. From the raw materials, hops samples showed better antioxidant activity when compared to malt samples (p <0.05). The correlation between electrochemical index (EI) and total phenols (TPC), and radical scavenging methods, 1,1-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis (3-ethylbenzthiazoline -6-sulphonic acid) (ABTS) was 0.86, 0.77 and 0.85 respectively for the hop samples. From the beers, ale group showed better antioxidant activity and TPC values when compared to the lager group. However, according to the Pearson correlation matrix, the correlation between IE with TPC, DPPH and ABTS was 0.86, 0.89 and 0.96 respectively for the lager group. While for the ale group, the correlations were not statistically significant (p> 0.05), mainly due to the turbidity interference of the samples during spectrophotometric assays. This fact reiterates the use of electrochemical methods, which minimize this type of problem besides being more sensitive and quick. Following the proposed electrochemical methodology, using the IE calculation, LB10 and AB1 samples obtained the highest indices. In the results of the principal components analysis (PCA) three groups were observed, where group III confirms LB10 and AB1 as the best antioxidants potential. LB10, AB1 and AB6 showed a maximal vasodilator effect of 92 ± 4, 88 ± 3 and 79 ± 3%, respectively. Both the vasodilator effect and the lipid peroxidation inhibition capacity may be associated with the presence of phenolic compounds in the beer samples, identified by mass spectrometry. This study, therefore, verified that the proposed IE methodology is an important tool to evaluate antioxidant properties and showed a good correlation with radical scavenging assays. Moreover, the study showed that beers may have a beneficial effect on the cardiovascular system, showing a good correlation of the vasodilator effect and antioxidant potential, which may be useful for future research on health, sensorial properties and quality parameters. Still from the standpoint of the quality of the beers, hop extracts as well as malt exhibited statistically results, corroborating to the applicability of these tools in the choice of these major ingredients improve the quality of the final product.
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OLIVEIRA NETO, Jerônimo Raimundo de. Potencial antioxidante e atividade vasodilatadora de cervejas comerciais. 2017. 93 f. Tese (Doutorado em Inovação Farmacêutica em Rede) - Universidade Federal de Goiás, Goiânia, 2017.