Changes

Forms of ''TetrahydropyridinTetrahydropyridine'' (specifically 6-Acetyl-2,3,4,5-tetrahydropyridine (ATHP/ACTPY) and 2-acetyl-1-pyrroline (ACPY) <ref name="wikipedia">[http://en.wikipedia.org/wiki/6-Acetyl-2,3,4,5-tetrahydropyridine 6-Acetyl-2,3,4,5-tetrahydropyridine. Wikipedia. Retrieved 3/210/2015.]</ref>) are commonly attributed to the ''mousy'', ''urine'' (in high amounts) ''cheerios'' (in low amounts), or more generically, ''cracker biscuit'' flavor in sour beers. The exact cause of this perceived flavor is not definitive. However, ''Tetrahydropyridin'' seems to be the most likely cause. Dimethyl Sulfide has also been indicated as a potential cause to this flavor in sour beers, probably due to the similar ''popcorn'' flavor that DMS can provide. The flavor tends to age out of sour beers, although the exact mechanism for this is not fully understood <ref>[http://www.homebrewtalk.com/f127/cheerios-character-after-bottling-504468/#post6516169 Tonsmeire, Michael. Homebrewtalk.com post 1. 11/21/2014. Retrieved 3/10/2015.]</ref>. Michael Tonsmeire also noticed that pitching rehydrated wine yeast at bottling reduces the amount/duration of this flavor <ref>[http://www.homebrewtalk.com/f127/cheerios-character-after-bottling-504468/#post6522207 Tonsmeire, Michael. Homebrewtalk.com post 2. 11/21/2014. Retrieved 3/10/2015.]</ref>.