Fusarium Profiling and Barley Malt Gushing Propensity

Vertti Virkajärvi, Tuija Sarlin, Arja Laitila

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

This study aimed to characterize and identify Fusarium fungi associated with barley malt samples showing gushing activity in quality control. The study included six different barley samples from different geographic locations in Europe. Barleys were malted in specially designed, computer- controlled micromalting equipment. Fungal contamination was determined with various polymerase chain reaction (PCR)-based assays including real-time PCR with group and species-specific primers, fungal profiling with PCR with denaturing high-performance liquid chromatography, and PCR with denaturing gradient gel electrophoresis. Furthermore, samples were tested for the presence of hydrophobins. Alternaria, Cochliobolus, and Fusarium were the dominant fungal genera in the barley samples. Two malt samples induced vigorous gushing in beer and in mineral water. Relatively high F. culmorum levels were determined in these malt samples. F. graminearum, F. poae, and F. Tricinctum were also detected in gushing-active samples. The production of gushing inducers during malting by F. culmorum, F. graminearum, and F. Tricinctum was verified by artificial contamination of barley. All strains multiplied in malting conditions and produced hydrophobins. However, differences were observed between isolates of the same species from different origins. This study showed that F. culmorum, F. graminearum, and F. Tricinctum are associated with elevated gushing risk.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalJournal of the American Society of Brewing Chemists
Volume75
Issue number3
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • barley
  • malt
  • Fusarium
  • gushing
  • hydrophobin
  • polymerase chain reaction (PCR)
  • denaturing high-performance liquid chromatography (DHPLC)

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