Sporeforming bacteria in beer: Occurrence, diversity, presence of hop resistance genes and fate in alcohol-free and lager beers

Autor(es)

Munford, Allan R. G. ; Alvarenga, Veronica O. ; do Prado-Silva, Leonardo ; Crucello, Aline ; Campagnollo, Fernanda B. ; Chaves, Rafael D. ; Oteiza, Juan M. ; Sant'Ana, Anderson S.

• Tipo de documento: Artigo Científico
• Fonte: FOOD CONTROL; v. 81, p. 126-136, NOV 2017.
• Citações Web of Science: 2

Resumo

The aim of this study was to assess the occurrence of sporeforming bacteria in different types of beers (n = 163) and to assess the presence of hor genes in the isolates. Additionally, the study aimed to evaluate the fate of five representative sporeforming bacteria harboring horA and horC genes in alcohol-free and lager beers. Two hundred and sixty (n = 260) sporeforming bacteria belonging to eight different genera were isolated from beers, i.e., Bacillus (n = 118), Paenibacillus (n = 89) and Brevibacillus (n = 41), Lysinbacillus (n = 6), Cohnella (n = 3), Rummeliibacillus (n =1), Alicyclobacillus (n = 1), and Anoxybacillus (n = 1), respectively. A predominance of members within the Bacillus cereus sensu lato (n = 72; 27.1%), followed by B. megaterium (n = 18; 7%), P. validus (n = 16; 6.1%), P. humicus (n = 13; 5%), P. alginolyticus (n = 13; 5%) and Br. brevis (n = 13; 5%) was observed in beer samples analyzed. Only 5% (n =14) out of 260 sporeforming bacterial isolates recovered from beers harbored one or both horA and horC genes. Only one (0.3%) isolate, i.e., Bacillus cereus sensu lato (identified as B. thuringiensis LMQA 206) presented both horA and horC genes. None of the five bacterial sporeforming strains harboring horA or horC genes inoculated was able to grow in the beers throughout the storage period studied, and no spoilage was detected. The results of this study indicated a widespread occurrence of sporeforming bacteria in several types of beers from different brands, highlighting that measures should be taken to reduce the occurrence of sporeforming bacteria considering stability and safety concerns. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/17387-8 - Identificação e análise funcional de novos genes e elementos regulatórios de Salmonella enterica implicados na sobrevivência e persistência em alimentos de baixa atividade de água
• Beneficiário: Aline Crucello
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/03791-1 - Modelagem estocástica single cell da formação de biofilmes e inativação de Salmonella e Listeria monocytogenes por sanificantes e seus impactos sobre a segurança dos alimentos
• Beneficiário: Rafael Djalma Chaves
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/14891-7 - Modelagem da inibição de Listeria monocytogenes por bactérias ácido láticas (BAL) em queijos Minas tradicionais
• Beneficiário: Fernanda Bovo Campagnollo
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado