Bottling: Corn Sugar vs. Dry Malt Extract (DME)
Having just been on the topic of bottling, this seems like a good time to address the age old question about which base to use for priming your bottles, corn sugar, or dry malt extract? There are, of course, other sugars that people use for this purpose, including molasses, table sugar, brown sugar, priming drops from various manufacturers, and a whole lot more. But the two main staples are the two in the title of this post: corn sugar and dry malt extract (DME). To understand which is better for your purpose, you need to understand what you’re doing when priming.
Bottled conditioned beers are carbonated by the gas produced by a final stage of fermentation. The yeast is given some sugar to eat, it produces carbon dioxide, and the close confines of the bottle force the carbon dioxide into suspension in the liquid since there is nowhere else for it to go. We’re not trying to change the taste of the beer here, nor produce more alcohol (though a little is formed). The chief concern is getting the yeast to efficiently generate carbon-dioxide, while not affecting the high quality of our beer.
So lets analyze corn sugar and dry malt extract for that purpose alone, initially. Corn sugar is made of simple sugar, all of which is fermentable. There is nothing in corn sugar that will produce additional sediment beyond the yeast cells that will form no matter what sugar you prime with. Corn sugar is easily and very efficiently consumed by the yeast to produce carbonation quickly and reliably in all bottles.
Dry malt extract on the other hand is made of several sugars, some of which are not easily fermented (or at all in some cases) and will take longer to produce carbonation. It also costs significantly more than corn sugar, which is quite inexpensive by contrast. DME will leave some leftovers in the bottle. Some people claim these help with head retention in the resulting beer, but in our experience this is not noticeable. On the other hand, in some cases a krauzen forms in the bottle when bottling with dry malt extract and that can be undesirable for the potential drinker of the bottle. It is also more difficult to evenly distribute the DME in all of the bottles, resulting in less even carbonation among bottles.
It’s our opinion that in nearly all cases corn sugar is superior to DME for bottling. This is not to say there is anything wrong with using the extract, simply that we don’t believe it works as well as corn sugar for this purpose. As with anything in brewing, people will do what they want. But our results have always been better with corn sugar, and we believe logical analysis is on our side.
In the future we may do a back-to-back comparison where we brew a single batch of beer, divide it in two at bottling time, and use corn sugar for half and DME for the other half. If you’d be interested in seeing that, leave a comment.
Cheers!









