Oxygen deficiency in barley (Hordeum vulgare) grain during malting

Annika Wilhelmson (Corresponding Author), Arja Laitila, Arvi Vilpola, Juhani Olkku, Erja Kotaviita, Kurt Fagerstedt, Silja Home

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    The steep water is generally aerated in industrial barley malting. However, it is questionable whether oxygen actually reaches the embryo, which remains entrapped under the husk, testa, and pericarp until chitting occurs. The aim of our study was to investigate whether barley embryos experience oxygen deficiency during steeping, and whether various steeping conditions affect the oxygen deficiency. Alcohol dehydrogenase Adh2 was induced in all steeping conditions studied. Therefore, oxygen deficiency occurred regardless of the steeping conditions. However, steeping conditions affected the rate of recovery from oxygen deficiency, germination rate, and onset of α-amylase production. When barley was subjected to oxygen deficiency by applying N2 gas during steeping, the timing of the treatment determined its effects. The importance of aeration increased as the process proceeded. Oxygen deprivation at the beginning of the process had little effect on malt quality. Therefore, the timing of aeration is important in the optimization of germination during the steeping stage of malting.
    Original languageEnglish
    Pages (from-to)409-416
    Number of pages8
    JournalJournal of Agricultural and Food Chemistry
    Volume54
    Issue number2
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Hordeum vulgare
    • Poaceae
    • barley
    • germination
    • steeping
    • oxygen deficiency
    • alcohol dehydrogenase
    • ethanol detection

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