Ask Mr. Wizard Amylase Enzymes Q I just brewed a doppelbock (my first lager) with a target original gravity (OG) of 1.095. Knowing pitching rates are super important for lagers, I made a robust starter. I used two packs of Wyeast Munich Lager II (Wyeast 2352-PC) in a 2 L (2 qt.) starter of 1.040 OG wort. Once the 2-L (2-Qt.) starter was finished, I cold crashed my starter, then created another 2-L (2 qt.) starter of 1.050 OG wort. By my calculations, after the second starter I should have had about 820 billion cells. After transferring the wort to my carboy for primary fermentation, I oxygenated the wort with pure oxygen. I pitched the yeast and transferred the carboy to my controlled fermentation chamber set at 55 °F (13 °C). After two weeks in primary the gravity was at 1.050 and stayed at 1.050 for the next three days. Fearing a stuck fermentation, I read various ways to fix it and continually came across using amylase enzyme. Would amylase enzyme help? Should I make another starter and re-pitch?. A At first glance, wort fermentability could be the problem with this brew. It seems that plenty of healthy yeast was used, the wort was well oxygenated and fermentation conducted at a very comfortable range for this yeast strain. One would expect a healthy fermentation from 1.095 to about 1.025–1.030 in two to three weeks. Having fermentation stop at 1.050 could certainly be an indicator that something is unusual with wort fermentability. And adding amylase enzymes could remedy this sort of issue. But my gut feeling is that this is not a wort fermentability issue. Read more |
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