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Magnesium-Accelerated Maillard Reactions Drive Differences in Adjunct and All-Malt Brewing

preprint
submitted on 06.11.2019 and posted on 13.11.2019 by Isaac Omari, Hannah Charnock, Alexa Fugina, Euan Thomson, J Scott McIndoe
Magnesium impacts key processes in brewing including yeast metabolism and mash pH but is typically overshadowed in brewing studies, owing to the established centrality of calcium. Using flame atomic absorption spectroscopy (FAAS), we have identified a 33.7% average increase in magnesium concentration in commercially available beers brewed with 100% barley malt versus those brewed with adjunct grains. Parallel analysis of brewing grains implicates rice in driving this discrepancy. Given the known catalytic properties of magnesium, we investigated its role in beer color development via Maillard chemistry using model systems and wort (unfermented beer). Kinetic data were obtained by ultraviolet-visible spectrometry and reaction species were identified by electrospray ionization mass spectrometry. Magnesium accelerated Maillard chemistry in all systems in a dose-dependent manner. It is proposed that magnesium inhibits water mobility and serves as a Lewis acid catalyst to facilitate Maillard reactions.

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in Journal of the American Society of Brewing Chemists

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Funding

NSERC Engage

History

Email Address of Submitting Author

mcindoe@uvic.ca

Institution

University of Victoria

Country

Canada

ORCID For Submitting Author

0000-0001-7073-5246

Declaration of Conflict of Interest

Study supported by Phillips Brewing & Malting Company

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Read the published paper

in Journal of the American Society of Brewing Chemists

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Categories

Exports