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Enzymatic Hydrogenation of trans-2-nonenal in Barley

Enzymatic Hydrogenation of trans-2-nonenal in Barley

Gustav Hambraeus, Nils Nyberg

J Agric Food Chem. 2005 Nov 2;53(22):8714-21.

PMID: 16248576

Abstract:

Conversion of undesirable, taste-active compounds is crucial for using barley as a suitable raw material for beer production. Here, ALH1, a barley alkenal hydrogenase enzyme that reduced the alpha,beta-unsaturated double bond of aldehydes and ketones, was found to convert trans-2-nonenal (T2N), a major contributor to the cardboard-like flavor of aged beer. Although the physiological function of ALH1 in barley development remains elusive, it exhibited high specificity with NADPH as a cofactor in the conversion of several oxylipins-including T2N, trans-2-hexenal, traumatin, and 1-octen-3-one. ALH1 action represents a previously unknown mechanism for T2N conversion in barley. Additional experimental results resolved the genomic sequence for barley ALH1, as well as the identification of a paralog gene encoding ALH2. Interestingly, T2N was not converted by purified, recombinant ALH2. The possibility to enhance ALH1 activity in planta is discussed--not only with respect to the physiological consequences thereof--but also in relation to improved beer quality.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP18829566	trans-2-Nonenal		18829-56-6	Price

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