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For a general overview of grain in brewing, see [http://www.homebrewtalk.com/wiki/index.php/Grain Homebrew Talk Wiki page on Grain].

===Acidulated Malt===

Acidulated malt (or acid malt) is often used in brewing to lower the mash pH when chemical acids (phosphoric or lactic acids) are not allowed or not desired. Acid malt is generally produced by one of three different methods. The first method to create acid malt is to hold germinating barley under anaerobic conditions for 24 hours or more to allow the lactic acid bacteria naturally found on the barley to produce lactic acid. The acidified barley is then kilned. A second method is to spray malt with ''[[Lactobacillus]]'' and then hold the malt at 50°C for 24-36 hours before kilning. The third method is to steep kilned malt in hot water at 45-50°C until the lactic acid bacteria naturally found on the malt (or sprayed onto it) produces around 1% lactic acid. The wet, acidic malt is then dried which concentrates the lactic acid to between 2 and 4% <ref name="Vaughan_2005">[https://onlinelibrary.wiley.com/doi/full/10.1002/j.2050-0416.2005.tb00221.x Enhancing the Microbiological Stability of Malt and Beer — A Review. Anne Vaughan, Tadhg O'Sullivan, Douwe Van Sinderen. 2005. DOI: https://doi.org/10.1002/j.2050-0416.2005.tb00221.x.]</ref>. Due to the uncontrolled nature of lactic acid bacteria used in the production of acid malt, lactic acid levels can vary from maltster to maltster and potentially batch to batch.

* [http://www.zerotolerancebrewing.com/ Zero Tolerance Gluten-Free Home Brew Club] and [https://www.facebook.com/groups/ZeroToleranceGF/ Facebook group].

* [https://www.facebook.com/groups/MilkTheFunk/permalink/1742361882458685/ Gluten free sour brewing with Joe Morris on MTF.]

==Microbial Populations on Barley==