Horst Dornbusch on the Low O2 Brewing paper

[doctorjames]

I'd like to read Bamforth's 1993 ASBC paper, but ASBC are even more closed than most publishers and require membership to read rather than being available in academic libraries, etc.

DOI: 10.1094/ASBCJ-51-0079

Oxygen and Oxygen Radicals in Malting and Brewing: A Review. C. W. Bamforth, R. E. Muller, and M. D. Walker, BRF International, Nutfield, Surrey, England. J. Am. Soc. Brew. Chem. 51:0079, 1993.

Because oxygen is a relatively stable molecule, it needs to be converted to one of several radical or activated forms before it can react with other species. Such activation may be caused by transition metal ions or by other radical species. Alternatively, activation may be brought about by enzymes such as lipoxygenase. In the context of oxidation in malting and brewing, it is argued that lipoxygenase is most active during malting and that the principal route by which oxygen is consumed in wort production is by peroxidase-catalyzed oxidation of polyphenols in mashing and by nonenzymatic oxidation of polyphenols in boiling. Oxygen, oxygen radicals, oxidation, and relevant protective systems are reviewed principally in the context of flavor instability. Oxygen and oxygen radicals are, however, relevant to other areas pertinent to the brewer, including enzyme inactivation: Hydroxyl radicals have been shown to inactivate malt β-glucanase. Phytic acid may protect against oxidation by scavenging metal ions.

[Owenbräu]

Yeah, a lot of his work his hard to get directly. Tech tried contacting him months ago for his paper on ascorbic acid oxidase, but there has been no response yet. Here is one work worth reading. It helped us understand the role of iron and copper in creating the reactive form of oxygen, superoxide (hence also the RO water and no copper). He's been hinting at the role of oxidation upstream for a long time, but again, I believe he is limited in modern breweries for how much he can push. Best bang for the buck right now at the commercial level is attention to the cold-side.

http://onlinelibrary.wiley.com/doi/10.1 ... 0025.x/pdf

[doctorjames]

Thanks; I'll give that a read. The IBD are great for having made all their archive open access.

Your link included some Wiley session tracking stuff so won't work for other people, here's a link that will: . (Wiley seem determined to make accessing all information harder than it should be.)