Control of microbial contamination in continuous primary fermentation by immobilized yeast

Ilkka Virkajärvi (Corresponding Author), Terhi Vauhkonen, Erna Storgårds

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Immobilized primary fermentation bioreactors were deliberately contaminated with an enterobacterium, Klebsiella terrigena, and changes were monitored in yeast performance and viability and in chemical composition of the green beers. In addition, the formation of biogenic amines, possible carcinogenic substances, was monitored. K. terrigena caused elevated concentrations of dimethyl sulfide in beer but did not cause significant changes in the concentrations of the analyzed higher alcohols or esters. On the other hand, the ratio between diacetyl and pentanedione was increased. The yeast viability was lowered without observed changes in fermentation capacity. The increased concentration of biogenic amines was mainly due to changes in the cadaverine concentration.
Original languageEnglish
Pages (from-to)63-68
Number of pages6
JournalJournal of the American Society of Brewing Chemists
Volume59
Issue number2
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

Raoultella terrigena
Biogenic Amines
microbial contamination
biogenic amines
beers
Fermentation
dimethyl sulfide
Yeasts
fermentation
viability
Cadaverine
yeasts
Diacetyl
diacetyl
cadaverine
Klebsiella
Bioreactors
Enterobacteriaceae
bioreactors
Esters

Keywords

  • beer
  • off-flavor

Cite this

Virkajärvi, Ilkka ; Vauhkonen, Terhi ; Storgårds, Erna. / Control of microbial contamination in continuous primary fermentation by immobilized yeast. In: Journal of the American Society of Brewing Chemists. 2001 ; Vol. 59, No. 2. pp. 63-68.
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Control of microbial contamination in continuous primary fermentation by immobilized yeast. / Virkajärvi, Ilkka (Corresponding Author); Vauhkonen, Terhi; Storgårds, Erna.

In: Journal of the American Society of Brewing Chemists, Vol. 59, No. 2, 2001, p. 63-68.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Control of microbial contamination in continuous primary fermentation by immobilized yeast

AU - Virkajärvi, Ilkka

AU - Vauhkonen, Terhi

AU - Storgårds, Erna

PY - 2001

Y1 - 2001

N2 - Immobilized primary fermentation bioreactors were deliberately contaminated with an enterobacterium, Klebsiella terrigena, and changes were monitored in yeast performance and viability and in chemical composition of the green beers. In addition, the formation of biogenic amines, possible carcinogenic substances, was monitored. K. terrigena caused elevated concentrations of dimethyl sulfide in beer but did not cause significant changes in the concentrations of the analyzed higher alcohols or esters. On the other hand, the ratio between diacetyl and pentanedione was increased. The yeast viability was lowered without observed changes in fermentation capacity. The increased concentration of biogenic amines was mainly due to changes in the cadaverine concentration.

AB - Immobilized primary fermentation bioreactors were deliberately contaminated with an enterobacterium, Klebsiella terrigena, and changes were monitored in yeast performance and viability and in chemical composition of the green beers. In addition, the formation of biogenic amines, possible carcinogenic substances, was monitored. K. terrigena caused elevated concentrations of dimethyl sulfide in beer but did not cause significant changes in the concentrations of the analyzed higher alcohols or esters. On the other hand, the ratio between diacetyl and pentanedione was increased. The yeast viability was lowered without observed changes in fermentation capacity. The increased concentration of biogenic amines was mainly due to changes in the cadaverine concentration.

KW - beer

KW - off-flavor

U2 - 10.1094/ASBCJ-59-0063

DO - 10.1094/ASBCJ-59-0063

M3 - Article

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EP - 68

JO - Journal of the American Society of Brewing Chemists

JF - Journal of the American Society of Brewing Chemists

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