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Characterization of Brazilian lager and brown ale beers based on color, phenolic compounds, and antioxidant activity using chemometrics
Author(s) -
Granato Daniel,
Branco Gabriel Favalli,
Faria José de Assis Fonseca,
Cruz Adriano Gomes
Publication year - 2011
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.4222
Subject(s) - dpph , oxygen radical absorbance capacity , chemistry , food science , trolox , chemometrics , flavonoid , antioxidant , chromatography , organic chemistry
BACKGROUND: Epidemiological studies have shown that beer has positive effects on inhibiting atherosclerosis, decreasing the content of serum low‐density lipoprotein cholesterol and triglycerides, by acting as in vivo free radical scavenger. In this research, the antioxidant activity of commercial Brazilian beers ( n = 29) was determined by the oxygen radical absorbance capacity (ORAC) and 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH · ) assays and results were analyzed by chemometrics. RESULTS: The brown ale samples ( n = 11) presented higher ( P < 0.05) flavonoids (124.01 mg L −1 ), total phenolics (362.22 mg L −1 ), non‐flavonoid phenolics (238.21 mg L −1 ), lightness (69.48), redness (35.75), yellowness (55.71), color intensity (66.86), hue angle (59.14), color saturation (0.9620), DPPH · values (30.96% inhibition), and ORAC values (3, 659.36 µmol Trolox equivalents L −1 ), compared to lager samples ( n = 18). Brown ale beers presented higher antioxidant properties ( P < 0.05) measured by ORAC (1.93 times higher) and DPPH (1.65 times higher) compared to lager beer. ORAC values correlated well with the content of flavonoids ( r = 0.47; P = 0.01), total phenolic compounds ( r = 0.44; P < 0.01) and DPPH ( r = 0.67; P < 0.01). DPPH values also correlated well to the content of flavonoids ( r = 0.69; P < 0.01), total phenolic compounds ( r = 0.60; P < 0.01), and non‐flavonoid compounds ( r = 0.46; P = 0.01). CONCLUSION The results suggest that brown ale beers, and less significantly lager beers, could be sources of bioactive compounds with suitable free radical scavenging properties. Copyright © 2010 Society of Chemical Industry