title: Phenolic compounds of Brazilian beers from different types and styles and application of chemometrics for modeling antioxidant capacity.
abstract: In the present study we aimed at investigating, for the first time, phenolic compounds in Brazilian beers of different types and styles. We also aimed at applying chemometrics for modeling beer's antioxidant capacity as a function of their physicochemical attributes (density, refractive index, bitterness and ethanol content). Samples (n=29) were analyzed by PCA originating five groups, especially according to ethanol contents and bitterness. In general, Group V (alcoholic beers with very high bitterness) presented higher refractive index, bitterness, ethanol and phenolics contents than Groups I (non-alcoholic beers) and II (alcoholic beers with low bitterness). Brazilian beers phenolics profile was distinct from that of European beers, with high contents of gallic acid (0.5-14.7 mg/L) and low contents of ferulic acid (0.2-1.8 mg/L). Using PLS, beer's antioxidant capacity measured by FRAP assay could be predicted with acceptable precision by data of ethanol content and density, bitterness and refractive index values.
authors.affiliation: Instituto de Nutrição, Universidade do Estado do Rio de Janeiro, R. São Francisco Xavier, 524 Pavilhão João Lyra Filho, 12° andar, Bloco D, sala 12002, 20559-900 Rio de Janeiro, Brazil. Electronic address: nunesnathalia@yahoo.com.br.
authors.forename: Nathália
authors.initials: N
authors.lastname: Moura-Nunes
authors.affiliation: Laboratório de Bioquímica Nutricional e de Alimentos, Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149 CT, Bloco A, sala 528A, 21941-909 Rio de Janeiro, Brazil. Electronic address: tharcilacazaroti@hotmail.com.
authors.forename: Thárcila Cazaroti
authors.initials: TC
authors.lastname: Brito
authors.affiliation: Laboratório de Bioquímica Nutricional e de Alimentos, Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149 CT, Bloco A, sala 528A, 21941-909 Rio de Janeiro, Brazil. Electronic address: niveadiasdafonseca@gmail.com.
authors.forename: Nívea Dias
authors.initials: ND
authors.lastname: da Fonseca
authors.affiliation: Laboratório de Quimiometria, Departamento de Química Analítica, Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149, CT, Bloco A, sala 517, 21949-909 Rio de Janeiro, Brazil. Electronic address: paula.fdeaguiar@gmail.com.
authors.forename: Paula Fernandes
authors.initials: PF
authors.lastname: de Aguiar
authors.affiliation: Laboratório de Alimentos Funcionais, Departamento de Nutrição Básica e Experimental, Instituto de Nutrição Josué de Castro, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho, 373, CCS, Bloco J, sala J2-16, 21941-902 Rio de Janeiro, Brazil. Electronic address: mariana@nutricao.ufrj.br.
authors.forename: Mariana
authors.initials: M
authors.lastname: Monteiro
authors.affiliation: Laboratório de Bioquímica Nutricional e de Alimentos, Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149 CT, Bloco A, sala 528A, 21941-909 Rio de Janeiro, Brazil. Electronic address: danielperrone@iq.ufrj.br.
authors.forename: Daniel
authors.initials: D
authors.lastname: Perrone
authors.affiliation: Laboratório de Bioquímica Nutricional e de Alimentos, Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149 CT, Bloco A, sala 528A, 21941-909 Rio de Janeiro, Brazil. Electronic address: torres@iq.ufrj.br.
authors.forename: Alexandre Guedes
authors.initials: AG
authors.lastname: Torres
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001515:Beer / Q000032:analysis*; D001938:Brazil; D016018:Least-Squares Analysis; D010636:Phenols / Q000032:analysis*; D010936:Plant Extracts / Q000494:pharmacology*; D012031:Refractometry
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts
keywords: 3,4-Dihydroxybenzoic acid (PubChem CID-72); 3,4-Dihydroxyphenylacetic acid (PubChem CID-547); 4-Hydroxyphenylacetic acid (PubChem CID-127); 5-Caffeoylquinic acid (PubChem CID-1794427); Benzoic acid (PubChem CID-243); Brewing; FRAP; Ferulic acid (PubChem CID-445858); Gallic acid (PubChem CID-370); Multivariate data analysis; Partial least squares (PLS); Principal component analysis (PCA); Syringic acid (PubChem CID-10742); Vanillic acid (PubChem CID-8468); p-Coumaric acid (PubChem CID-637542)